Use QUIC as transport protocoll

Fixes: #7001

.gitea/workflows/checkrefs.yml

@@ -11,7 +11,7 @@ jobs:
   lfscheck:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
       - name: Fetch the base branch
         run: git fetch origin ${{ env.BASE_SHA }}
@@ -24,27 +24,14 @@ jobs:
     env:
       GIT_LFS_SKIP_SMUDGE: "1"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v7
         with:
           python-version: "3.11"
       - name: Add remote fork origin for LFS
         run: |
           PR_REPO="${{ gitea.event.pull_request.head.repo.full_name || gitea.repository }}"
           git remote add ${{ gitea.actor }} https://gitea.wildfiregames.com/${PR_REPO}.git
-      - name: Workaround for authentication problem with LFS
-        # https://gitea.com/gitea/act_runner/issues/164
-        run: |
-          git config --local \
-          http.${{ gitea.server_url }}/${{ gitea.repository }}.git/info/lfs/objects/.extraheader ''
-
-          PR_REPO="${{ gitea.event.pull_request.head.repo.full_name || gitea.repository }}"
-          EXTRAHEADER="$(git config --get --local http.${{ gitea.server_url }}/.extraheader)"
-          git config --local \
-            http.${{ gitea.server_url }}/${PR_REPO}.git/info/lfs/objects/batch.extraheader \
-            '${EXTRAHEADER}'
-          git config --local \
-            http.${{ gitea.server_url }}/${PR_REPO}.git/info/lfs/objects/.extraheader ''
       - name: Download necessary LFS assets
         shell: sh {0}
         run: |

.gitea/workflows/lint.yml

@@ -12,7 +12,7 @@ jobs:
   cppcheck:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
       # cache only works for items in workspace, so configure apt to allow for caching.
       - name: Setup apt cache locations
@@ -26,7 +26,7 @@ jobs:
 
       - name: Cache apt pkg db and and deb files
         id: apt-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             apt-cache
@@ -49,11 +49,11 @@ jobs:
   copyright:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           fetch-depth: 100
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v7
         with:
           python-version: "3.11"
 
@@ -66,10 +66,10 @@ jobs:
   jenkinsfiles:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
       - name: Set up Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v7
         with:
           node-version: '20'
 

.gitea/workflows/pre-commit.yml

@@ -3,22 +3,27 @@ name: pre-commit
 on:
   - push
   - pull_request
+env:
+  PRE_COMMIT_VERSION: 4.6.0
 jobs:
-  build:
+  pre-commit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v7
         with:
           python-version: "3.11"
-      - id: restore-pip-cache
+      - uses: actions/cache@v6
-        uses: actions/cache/restore@v4
         with:
-          key: pip-cache-v1-${{ github.workflow }}
+          key: pip-cache-v1-${{github.workflow}}-${{env.pythonLocation}}-${{env.PRE_COMMIT_VERSION}}
           path: ~/.cache/pip
-      - uses: pre-commit/action@v3.0.1
+      - run: python -m pip install pre-commit=="${{ env.PRE_COMMIT_VERSION }}"
-      - uses: actions/cache/save@v4
+        shell: bash
-        if: steps.restore-pip-cache.outcome == 'success'
+      - run: python -m pip freeze --local
+        shell: bash
+      - uses: actions/cache@v6
         with:
-          key: pip-cache-v1-${{ github.workflow }}
+          path: ~/.cache/pre-commit
-          path: ~/.cache/pip
+          key: pre-commit-3|${{ env.pythonLocation }}|${{ hashFiles('.pre-commit-config.yaml') }}
+      - run: pre-commit run --show-diff-on-failure --color=always --all-files
+        shell: bash

.pre-commit-config.yaml

@@ -34,7 +34,7 @@ repos:
             \.patch$
           )
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.12.9
+    rev: v0.16.0
     hooks:
       - id: ruff-check
         args:
@@ -56,7 +56,7 @@ repos:
         files: ^binaries/
         exclude: (^binaries/data/mods/(mod|public)/art/.*\.xml|\.dae$)
   - repo: https://github.com/scop/pre-commit-shfmt
-    rev: v3.12.0-2
+    rev: v3.13.1-1
     hooks:
       - id: shfmt
         args:
@@ -67,7 +67,7 @@ repos:
     hooks:
       - id: shellcheck
   - repo: https://github.com/igorshubovych/markdownlint-cli
-    rev: v0.45.0
+    rev: v0.47.0
     hooks:
       - id: markdownlint
         language_version: 22.14.0
@@ -77,13 +77,13 @@ repos:
             ^source/third_party/
           )
   - repo: https://github.com/adrienverge/yamllint
-    rev: v1.37.1
+    rev: v1.38.0
     hooks:
       - id: yamllint
         args:
           - --strict
   - repo: https://github.com/eslint/eslint
-    rev: v9.39.2
+    rev: v10.8.0
     hooks:
       - id: eslint
         language_version: 22.14.0

binaries/data/mods/mod/art/materials/material.rng

@@ -78,6 +78,9 @@
         <optional>
           <attribute name="define"/>
         </optional>
+        <optional>
+          <attribute name="srgb"/>
+        </optional>
       </element>
     </zeroOrMore>
   </interleave>

binaries/data/mods/mod/shaders/glsl/common/compute.h

@@ -12,10 +12,10 @@
 	layout(set = 2, binding = LOCATION, FORMAT) uniform image2D NAME
 #if USE_DESCRIPTOR_INDEXING
 #define STORAGE_BUFFER(LOCATION) \
-	layout(set = 2, binding = LOCATION)
+	layout(std430, set = 2, binding = LOCATION)
 #else
 #define STORAGE_BUFFER(LOCATION) \
-	layout(set = 1, binding = LOCATION)
+	layout(std430, set = 1, binding = LOCATION)
 #endif
 #else
 // We use offset to the binding slot for OpenGL to avoid overlapping with other
@@ -23,7 +23,7 @@
 #define STORAGE_2D(LOCATION, FORMAT, NAME) \
 	layout(binding = LOCATION, FORMAT) uniform image2D NAME
 #define STORAGE_BUFFER(LOCATION) \
-	layout(binding = LOCATION)
+	layout(std430, binding = LOCATION)
 #endif
 
 #endif // STAGE_COMPUTE

binaries/data/mods/public/art/actors/structures/achaemenids/house.xml

@@ -51,6 +51,18 @@
       </textures>
     </variant>
   </group>
+  <group>
+    <variant name="ungarrisoned" frequency="1" />
+    <variant name="garrisoned">
+      <props>
+        <prop
+          actor="props/special/common/garrison_flag_achaemenids.xml"
+          attachpoint="garrisoned"
+          selectable="false"
+        />
+      </props>
+    </variant>
+  </group>
   <group>
     <variant name="alive" frequency="1"/>
     <variant file="structures/destruction_small.xml"/>

binaries/data/mods/public/art/actors/structures/celts/house.xml

@@ -33,6 +33,18 @@
 	  </textures>
     </variant>
   </group>
+  <group>
+    <variant frequency="1" name="ungarrisoned" />
+    <variant name="garrisoned">
+      <props>
+        <prop
+          actor="props/special/common/garrison_flag_celt.xml"
+          attachpoint="garrisoned"
+          selectable="false"
+        />
+      </props>
+    </variant>
+  </group>
   <group>
     <variant name="alive" frequency="1"/>
     <variant file="structures/destruction_small.xml"/>

binaries/data/mods/public/art/actors/structures/gauls/house.xml

@@ -53,6 +53,18 @@
       </textures>
     </variant>
   </group>
+  <group>
+    <variant name="ungarrisoned" frequency="1" />
+    <variant name="garrisoned">
+      <props>
+        <prop
+          actor="props/special/common/garrison_flag_celt.xml"
+          attachpoint="garrisoned"
+          selectable="false"
+        />
+      </props>
+    </variant>
+  </group>
   <group>
     <variant name="alive" frequency="1"/>
     <variant file="structures/destruction_small.xml"/>

binaries/data/mods/public/art/actors/structures/germans/house.xml

@@ -134,6 +134,20 @@
       </props>
     </variant>
   </group>
+
+  <group>
+    <variant frequency="1" name="ungarrisoned" />
+    <variant name="garrisoned">
+      <props>
+        <prop
+          actor="props/special/common/garrison_flag_germ.xml"
+          attachpoint="garrisoned"
+          selectable="false"
+        />
+      </props>
+    </variant>
+  </group>
+
   <group>
     <variant name="alive" frequency="1"/>
     <variant file="structures/destruction_small.xml"/>

binaries/data/mods/public/art/actors/structures/iberians/house.xml

@@ -106,6 +106,18 @@
       </props>
     </variant>
   </group>
+  <group>
+    <variant name="ungarrisoned" frequency="1" />
+    <variant name="garrisoned">
+      <props>
+        <prop
+          actor="props/special/common/garrison_flag_iber.xml"
+          attachpoint="garrisoned"
+          selectable="false"
+        />
+      </props>
+    </variant>
+  </group>
   <group>
     <variant name="alive" frequency="1"/>
     <variant file="structures/destruction_small.xml"/>

binaries/data/mods/public/art/actors/structures/romans/house.xml

@@ -47,6 +47,18 @@
       </textures>
     </variant>
   </group>
+  <group>
+    <variant name="ungarrisoned" frequency="1" />
+    <variant name="garrisoned">
+      <props>
+        <prop
+          actor="props/special/common/garrison_flag_rome.xml"
+          attachpoint="garrisoned"
+          selectable="false"
+        />
+      </props>
+    </variant>
+  </group>
   <group>
     <variant name="alive" frequency="1"/>
     <variant file="structures/destruction_small.xml"/>

binaries/data/mods/public/art/actors/structures/seleucids/house.xml

@@ -43,6 +43,18 @@
       </textures>
     </variant>
   </group>
+  <group>
+    <variant frequency="1" name="ungarrisoned" />
+    <variant name="garrisoned">
+      <props>
+        <prop
+          actor="props/special/common/garrison_flag_seleucids.xml"
+          attachpoint="garrisoned"
+          selectable="false"
+        />
+      </props>
+    </variant>
+  </group>
   <group>
     <variant name="alive" frequency="1"/>
     <variant file="structures/sele/light_damage.xml"/>

binaries/data/mods/public/art/meshes/structural/achae_house_a.dae

@@ -1,3 +1,3 @@
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-size 586243
+size 586427

binaries/data/mods/public/art/meshes/structural/achae_house_b.dae

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-size 525300
+size 525483

binaries/data/mods/public/art/meshes/structural/achae_house_c.dae

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binaries/data/mods/public/art/meshes/structural/achae_house_d.dae

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binaries/data/mods/public/art/meshes/structural/celt_house_a.dae

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binaries/data/mods/public/art/meshes/structural/gaul_house_a.dae

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binaries/data/mods/public/art/meshes/structural/germans/house_a.dae

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binaries/data/mods/public/art/meshes/structural/sele_house_c.dae

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:221eeca4ee2e46023d346e80c7a3b4b3852699e0c193e31fa58e0619e858f7a2
+oid sha256:f177172ef923455050064af60377f2e1b171ff4ec72fa9aa5fdc5c4c28000550
-size 272252
+size 272435

binaries/data/mods/public/art/meshes/structural/sele_house_d.dae

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:afc01d8e7e7efc988b2f78b58cfb6b48b5453b8786609e9ce5db38bc617a7984
+oid sha256:acdaaf09848dc5cb7cf207c7bb535865aa4199a5a50609ca3b632ce5d88d95a2
-size 279942
+size 280139

binaries/data/mods/public/globalscripts/Math.js

@@ -330,3 +330,20 @@ Math.euclidDistance3D = function(x1, y1, z1, x2, y2, z2)
 {
 	return Math.sqrt(Math.euclidDistance3DSquared(x1, y1, z1, x2, y2, z2));
 };
+
+/**
+ * Clamps a value between a minimum and maximum range.
+ *
+ * @param {number} value - The value to clamp
+ * @param {number} min - Minimum allowed value
+ * @param {number} max - Maximum allowed value
+ * @returns {number} The clamped value (min <= result <= max)
+ */
+Math.clamp = function(value, min, max)
+{
+	if (value < min)
+		return min;
+	if (value > max)
+		return max;
+	return value;
+};

binaries/data/mods/public/globalscripts/vector.js

@@ -442,3 +442,17 @@ Vector3D.div = function(v, f)
 {
 	return new Vector3D(v.x / f, v.y / f, v.z / f);
 };
+
+/**
+ * Linear interpolation between this vector and another.
+ * @param {Vector2D} v - The target vector.
+ * @param {number} t - Interpolation factor (0 = this, 1 = v).
+ * @returns {Vector2D} A new vector at the interpolated position.
+ */
+Vector2D.prototype.lerp = function(v, t)
+{
+	return new Vector2D(
+		this.x + (v.x - this.x) * t,
+		this.y + (v.y - this.y) * t
+	);
+};

binaries/data/mods/public/gui/credits/texts/art.json

@@ -72,6 +72,7 @@
 			"List": [
 				{ "nick": "Alexandermb", "name": "Daniel Morgado" },
 				{ "nick": "Athos" },
+				{ "nick": "Atrik" },
 				{ "nick": "Basshunter", "name": "Sebastián Gómez" },
 				{ "nick": "BigTiger", "name": "Nathanael P. Moore" },
 				{ "nick": "Brightgalrs", "name": "Robert D. Schultz" },
@@ -80,6 +81,7 @@
 				{ "nick": "Enrique", "name": "Enrique Keykens Espolio" },
 				{ "nick": "Gen.Kenobi", "name": "Daniel Schubert" },
 				{ "nick": "Historicity", "name": "Shane" },
+				{ "nick": "Langbart" },
 				{ "nick": "Leyto", "name": "Valentin Levalet" },
 				{ "nick": "LordGood", "name": "Johnathan B. Good" },
 				{ "nick": "m7600" },

binaries/data/mods/public/gui/session/input.js

@@ -507,6 +507,49 @@ var unitFilters = {
 	}
 };
 
+// Choose, inside a list of entities, which ones are targetable foes for boxtargeting.
+// We also filter out entities that aren't visible, or low priority like livestocks
+function getTargetableEntities(ents)
+{
+	const player = g_ViewedPlayer;
+	const simState = GetSimState();
+	const isEnemy = simState.players[player].isEnemy;
+
+	// Filter valid target candidates
+	const candidates = ents.filter(entity =>
+	{
+		const entState = GetEntityState(entity);
+		return entState &&
+			unitFilters.isUnit(entity) &&
+			entState.visibility != "hidden";
+	});
+
+	// Enemy players
+	const enemyPlayers = candidates.filter(entity =>
+	{
+		const entState = GetEntityState(entity);
+		return isEnemy[entState.player] && entState.player !== 0 && !hasClass(entState, "Domestic");
+	});
+	if (enemyPlayers.length > 0)
+		return enemyPlayers;
+
+	// Gaia
+	const gaiaUnits = candidates.filter(entity =>
+	{
+		const entState = GetEntityState(entity);
+		return entState.player === 0;
+	});
+	if (gaiaUnits.length > 0)
+		return gaiaUnits;
+
+	// Domestic animals
+	return candidates.filter(entity =>
+	{
+		const entState = GetEntityState(entity);
+		return hasClass(entState, "Domestic");
+	});
+}
+
 // Choose, inside a list of entities, which ones will be selected.
 // We may use several entity filters, until one returns at least one element.
 function getPreferredEntities(ents)
@@ -572,16 +615,19 @@ function handleInputBeforeGui(ev, hoveredObject)
 	case INPUT_BANDBOXING:
 	{
 		const bandbox = Engine.GetGUIObjectByName("bandbox");
+		const isAttackMode = Engine.HotkeyIsPressed("session.attack") && !g_IsObserver;
 		switch (ev.type)
 		{
 		case "mousemotion":
 		{
 			const rect = updateBandbox(bandbox, ev, false);
 
-			const ents = Engine.PickPlayerEntitiesInRect(rect[0], rect[1], rect[2], rect[3], g_ViewedPlayer);
+			const player = isAttackMode ? -1 : g_ViewedPlayer;
-			const preferredEntities = getPreferredEntities(ents);
-			g_Selection.setHighlightList(preferredEntities);
 
+			const ents = Engine.PickPlayerEntitiesInRect(rect[0], rect[1], rect[2], rect[3], player);
+			const highlightEntities = isAttackMode ? getTargetableEntities(ents) : getPreferredEntities(ents);
+
+			g_Selection.setHighlightList(highlightEntities);
 			return false;
 		}
 
@@ -589,6 +635,30 @@ function handleInputBeforeGui(ev, hoveredObject)
 			if (ev.button == SDL_BUTTON_LEFT)
 			{
 				const rect = updateBandbox(bandbox, ev, true);
+				if (isAttackMode)
+				{
+					// Box attack behavior
+					const ents = Engine.PickPlayerEntitiesInRect(rect[0], rect[1], rect[2], rect[3], -1);
+
+					// Filter to only enemy units
+					const enemyUnits = getTargetableEntities(ents);
+
+					// Get currently selected friendly units
+					const selectedUnits = g_Selection.toList();
+
+					if (selectedUnits.length && enemyUnits.length)
+					{
+						// Sort entities by position
+						const sortedCombattants = sortEntitiesForEngagement(selectedUnits, enemyUnits);
+						// Distribute attack orders
+						distributeAttackOrders(sortedCombattants.attackers, sortedCombattants.targets);
+					}
+					g_Selection.setHighlightList([]);
+					inputState = INPUT_NORMAL;
+
+					return true;
+				}
+
 				const ents = getPreferredEntities(Engine.PickPlayerEntitiesInRect(rect[0], rect[1], rect[2], rect[3], g_ViewedPlayer));
 				g_Selection.setHighlightList([]);
 
@@ -1371,6 +1441,7 @@ function positionUnitsFreehandSelectionMouseUp(ev)
 	for (let i = 1; i < inputLine.length; ++i)
 		lengthOfLine += inputLine[i].distanceTo(inputLine[i - 1]);
 
+	// Filter units that can move
 	const selection = g_Selection.filter(ent => !!GetEntityState(ent).unitAI).sort((a, b) => a - b);
 
 	// Checking the line for a minimum length to save performance.
@@ -1380,39 +1451,43 @@ function positionUnitsFreehandSelectionMouseUp(ev)
 		return !!action && doAction(action, ev);
 	}
 
-	// Even distribution of the units on the line.
+	// Sort units by their projection onto the line direction (parallel sorting)
-	let p0 = inputLine[0];
+	const sortedSelection = sortEntitiesAlongLine(selection, inputLine[0], inputLine[inputLine.length - 1], true);
-	let entityDistribution = [p0];
-	const distanceBetweenEnts = lengthOfLine / (selection.length - 1);
-	let freeDist = -distanceBetweenEnts;
 
-	for (let i = 1; i < inputLine.length; ++i)
+	const selectionCount = sortedSelection.length;
+	const targetPositions = [];
+
+	// Distribute units evenly along the polyline
+	for (let i = 0; i < selectionCount; ++i)
 	{
-		const p1 = inputLine[i];
+		const t = i / (selectionCount - 1);
-		freeDist += inputLine[i - 1].distanceTo(p1);
+		const targetDistance = t * lengthOfLine;
 
-		while (freeDist >= 0)
+		let accumulated = 0;
+		let targetPoint = inputLine[0];
+		for (let j = 1; j < inputLine.length; ++j)
 		{
-			p0 = Vector2D.sub(p0, p1).normalize().mult(freeDist).add(p1);
+			const segStart = inputLine[j - 1];
-			entityDistribution.push(p0);
+			const segEnd = inputLine[j];
-			freeDist -= distanceBetweenEnts;
+			const segLength = segEnd.distanceTo(segStart);
+
+			if (accumulated + segLength >= targetDistance)
+			{
+				// Interpolate within this segment
+				const remaining = targetDistance - accumulated;
+				const frac = remaining / segLength;
+				targetPoint = segStart.lerp(segEnd, frac);
+				break;
+			}
+			accumulated += segLength;
 		}
+		targetPositions.push(targetPoint);
 	}
 
-	// Rounding errors can lead to missing or too many points.
-	entityDistribution = entityDistribution.slice(0, selection.length);
-	entityDistribution = entityDistribution.concat(new Array(selection.length - entityDistribution.length).fill(inputLine[inputLine.length - 1]));
-
-	if (Vector2D.from3D(GetEntityState(selection[0]).position).distanceTo(entityDistribution[0]) +
-	    Vector2D.from3D(GetEntityState(selection[selection.length - 1]).position).distanceTo(entityDistribution[selection.length - 1]) >
-	    Vector2D.from3D(GetEntityState(selection[0]).position).distanceTo(entityDistribution[selection.length - 1]) +
-	    Vector2D.from3D(GetEntityState(selection[selection.length - 1]).position).distanceTo(entityDistribution[0]))
-		entityDistribution.reverse();
-
 	Engine.PostNetworkCommand({
 		"type": isAttackMovePressed() ? "attack-walk-custom" : "walk-custom",
-		"entities": selection,
+		"entities": sortedSelection,
-		"targetPositions": entityDistribution.map(pos => pos.toFixed(2)),
+		"targetPositions": targetPositions.map(pos => pos.toFixed(2)),
 		"targetClasses": Engine.HotkeyIsPressed("session.attackmoveUnit") ? { "attack": ["Unit"] } : { "attack": ["Unit", "Structure"] },
 		"queued": Engine.HotkeyIsPressed("session.queue"),
 		"pushFront": Engine.HotkeyIsPressed("session.pushorderfront"),
@@ -1420,9 +1495,10 @@ function positionUnitsFreehandSelectionMouseUp(ev)
 	});
 
 	// Add target markers with a minimum distance of 5 to each other.
-	const entitiesBetweenMarker = Math.ceil(5 / distanceBetweenEnts);
+	const stepDistance = lengthOfLine / (selectionCount - 1);
-	for (let i = 0; i < entityDistribution.length; i += entitiesBetweenMarker)
+	const entitiesBetweenMarker = Math.max(1, Math.ceil(5 / stepDistance));
-		DrawTargetMarker({ "x": entityDistribution[i].x, "z": entityDistribution[i].y });
+	for (let i = 0; i < targetPositions.length; i += entitiesBetweenMarker)
+		DrawTargetMarker({ "x": targetPositions[i].x, "z": targetPositions[i].y });
 
 	Engine.GuiInterfaceCall("PlaySound", {
 		"name": "order_walk",
@@ -1929,3 +2005,108 @@ function clearSelection()
 		g_Selection.reset();
 	preSelectedAction = ACTION_NONE;
 }
+
+function distributeAttackOrders(attackers, targets)
+{
+	if (targets.length < 1)
+		return;
+
+	// Play attack sounds from a sample of units in selection
+	const soundCount = Math.min(3, attackers.length);
+	for (let i = 0; i < soundCount; i++)
+	{
+		const t = soundCount === 1 ? 0 : i / (soundCount - 1);
+		const attackerIndex = Math.floor(t * (attackers.length - 1));
+
+		setTimeout(() =>
+		{
+			Engine.GuiInterfaceCall("PlaySound", {
+				"name": "order_attack",
+				"entity": attackers[attackerIndex]
+			});
+		}, i * 180);
+	}
+
+	Engine.PostNetworkCommand({
+		"type": "attack-group",
+		"entities": attackers,
+		"targets": targets,
+		"queued": Engine.HotkeyIsPressed("session.queue"),
+		"allowCapture": false
+	});
+}
+
+/**
+ * Sorts attackers and targets for left-to-right engagement across the battle line.
+ *
+ * Entities are sorted by their perpendicular distance to the line connecting the
+ * two army centers, creating natural pairings across the battle front.
+ *
+ * @param {number[]} attackers - Array of attacking entity IDs.
+ * @param {number[]} targets - Array of target entity IDs.
+ * @returns {Object} { attackers: number[], targets: number[] } - Both arrays sorted
+ *                   for cross-line engagement (targets automatically reversed).
+ */
+function sortEntitiesForEngagement(attackers, targets)
+{
+	const getPosition = (id) => GetEntityState(id).position;
+
+	const computeAveragePosition = (entities) =>
+	{
+		if (entities.length === 0) return new Vector2D(0, 0);
+		const vectors = entities.map(id => Vector2D.from3D(getPosition(id)));
+		return Vector2D.average(vectors);
+	};
+
+	// Calculate the axis of engagement - the line between the groups' average positions
+	const avgAttackers = computeAveragePosition(attackers);
+	const avgTargets = computeAveragePosition(targets);
+
+	// Sort each group by perpendicular distance to the engagement line
+	const sortedAttackers = sortEntitiesAlongLine(attackers, avgAttackers, avgTargets);
+	const sortedTargets = sortEntitiesAlongLine(targets, avgAttackers, avgTargets);
+
+	// Reverse targets so the leftmost attacker pairs with leftmost target
+	return {
+		"attackers": sortedAttackers,
+		"targets": sortedTargets.reverse()
+	};
+}
+
+/**
+ * Sorts entity IDs by their projection onto a line's direction or perpendicular axis.
+ *
+ * @param {number[]} entities - Array of entity IDs.
+ * @param {Vector2D} lineStart - Start point of the reference line.
+ * @param {Vector2D} lineEnd - End point of the reference line.
+ * @param {boolean} sortByDirection - If true, sort by parallel projection (along line);
+ *                                    If false, sort by perpendicular distance (default).
+ * @returns {number[]} Sorted entity IDs.
+ */
+function sortEntitiesAlongLine(entities, lineStart, lineEnd, sortByDirection = false)
+{
+	const dir = lineEnd.sub(lineStart);
+	const length = dir.length();
+	if (length === 0)
+		return entities.slice();
+
+	// Choose basis vector: either parallel or perpendicular to the line
+	let basis;
+	if (sortByDirection)
+		basis = dir.mult(1 / length); // Unit direction vector
+	else
+		basis = new Vector2D(-dir.y, dir.x).normalize(); // Perpendicular
+
+	const withCoord = entities.map(id =>
+	{
+		const pos = GetEntityState(id).position;
+		const point2D = Vector2D.from3D(pos);
+		const rel = point2D.sub(lineStart);
+		const coord = rel.dot(basis); // Project onto basis vector
+		return { id, coord };
+	});
+
+	// Sort by that coordinate
+	withCoord.sort((a, b) => a.coord - b.coord);
+	return withCoord.map(item => item.id);
+}

binaries/data/mods/public/gui/text/quotes.txt

@@ -208,3 +208,13 @@
 “This is a woman's resolve; as for men, they may live and be slaves.” \n— Boudicca, rallying against Roman occupation (Tacitus's Annals, Book 14, Chapter 35)
 “There are two things, knowledge and opinion; one makes its possessor know, the other to be ignorant.” \n— (Hippocratic treatise known as “The Law”, part of the Hippocratic Corpus)
 “Let them hate me, so long as they fear me.” \n— Caligula (Suetonius, The Twelve Caesars, Book 30)
+“There is no instance of a nation benefiting from prolonged warfare.” \n— Sun Tzu (“The Art of War”, Chapter 2)
+“To subdue the enemy without fighting is the acme of skill.” \n— Sun Tzu (“The Art of War”, Chapter 3)
+“One defends when his strength is inadequate; he attacks when it is abundant.” \n— Sun Tzu (“The Art of War”, Chapter 4)
+“When torrential water tosses boulders, it is because of its momentum. When the strike of a hawk breaks the body of its prey, it is because of timing.” \n— Sun Tzu (“The Art of War”, Chapter 5)
+“Treat your men as you would your own beloved sons. And they will follow you into the deepest valley.” \n— Sun Tzu (“The Art of War”, Chapter 10)
+“Woe to the defeated!” \n— Brennus disputing the weight of gold ransom while sacking Rome c. 387 BC  (Livy, “Ab Urbe Condita”, Book 5, Chapter 48)
+“\[Brutus] found the women fighting and perishing in company with the men with such bravery that they uttered no cry even in the midst of slaughter.” \n— Brutus in Lusitania during the battles with Viriathus (Appian of Alexandria, “The Spanish Wars”, 15)
+“What I desire for my own children, I desire for all men.” \n— Ashoka the Great (“The Kalinga Rock Edicts”)
+“If you Romans choose to lord it over the world, does it follow that the world is to accept slavery ?” \n— Caratacus pleading for pardon from Roman Emperor Claudius in Rome (Tacitus, “Annals”, 12.37)
+“And where am I to get so many soldiers ?” \n— Septimius Severus, frustrated with the challenge of controlling his own men and the harsh realities of frontier warfare against the northern tribes in Britannia. (Cassius Dio, “Roman History”, Vol IX, Book LXXVI, Section 11)

binaries/data/mods/public/maps/random/rmgen/RandomMapLogger.js

@@ -1,6 +1,6 @@
 function RandomMapLogger()
 {
-	this.lastTime = undefined;
+	this.taskStarted = false;
 	this.startTime = Engine.GetMicroseconds ? Engine.GetMicroseconds() : 0;
 	this.prefix = ""; // seems noisy
 
@@ -21,27 +21,18 @@ RandomMapLogger.prototype.printDirectly = function(string)
 
 RandomMapLogger.prototype.print = function(string)
 {
-	this.printDuration();
+	if (this.taskStarted)
-	this.printDirectly(this.prefix + string + "...");
+		Engine.ProfileStop();
-	this.lastTime = Engine.GetMicroseconds();
-};
 
-RandomMapLogger.prototype.printDuration = function()
+	const text = this.prefix + string;
-{
+	this.printDirectly(text + "...\n");
-	if (!this.lastTime)
+	Engine.ProfileStart(text);
-		return;
+	this.taskStarted = true;
-
-	this.printDurationDirectly("", this.lastTime);
-	this.lastTime = Engine.GetMicroseconds();
 };
 
 RandomMapLogger.prototype.close = function()
 {
-	this.printDuration();
+	if (this.taskStarted)
-	this.printDurationDirectly(this.prefix + "Total map generation time:", this.startTime);
+		Engine.ProfileStop();
-};
+	this.printDirectly(this.prefix + "Map generation finished.\n");
-
-RandomMapLogger.prototype.printDurationDirectly = function(text, startTime)
-{
-	this.printDirectly(text + " " + ((Engine.GetMicroseconds() - startTime) / 1000000).toFixed(6) + "s.\n");
 };

binaries/data/mods/public/maps/scripts/TriggerHelper.js

@@ -603,4 +603,147 @@ TriggerHelper.SpawnAndTurretAtClasses = function(playerID, classes, templates, c
 	return results;
 };
 
+/**
+ * Makes an entity permanently visible to all players by:
+ * - Setting alwaysVisible flag
+ * - Deactivating fogging (no mirages)
+ * - Exploring the surrounding area
+ * - Forcing a visibility update
+ *
+ * @param {number} ent - Entity ID to make permanently visible
+ */
+TriggerHelper.MakeEntityPermanentlyVisible = function(ent)
+{
+	const cmpVisibility = Engine.QueryInterface(ent, IID_Visibility);
+	if (cmpVisibility)
+	{
+		cmpVisibility.alwaysVisible = true;
+		cmpVisibility.SetActivated(true);
+	}
+
+	const cmpFogging = Engine.QueryInterface(ent, IID_Fogging);
+	if (cmpFogging)
+		cmpFogging.PermanentlyReveal("all");
+
+	const cmpRangeManager = Engine.QueryInterface(SYSTEM_ENTITY, IID_RangeManager);
+	const cmpPosition = Engine.QueryInterface(ent, IID_Position);
+	if (cmpRangeManager && cmpPosition && cmpPosition.IsInWorld())
+	{
+		const pos = cmpPosition.GetPosition2D();
+		const numPlayers = Engine.QueryInterface(SYSTEM_ENTITY, IID_PlayerManager).GetNumPlayers();
+
+		const exploreRadius = TriggerHelper.CalculateExplorationRadius(ent);
+
+		for (let i = 1; i < numPlayers; ++i)
+			cmpRangeManager.ExploreCircle(i, pos.x, pos.y, exploreRadius);
+
+		cmpRangeManager.RequestVisibilityUpdate(ent);
+	}
+};
+
+/**
+ * Calculate a reasonable exploration radius from an entity's footprint.
+ * Calculates the radius as the entity's full extent to reveal the surrounding area.
+ * This is equivalent to (extent/2) * 2, giving a 2x margin around the entity.
+ */
+TriggerHelper.CalculateExplorationRadius = function(ent)
+{
+	const cmpFootprint = Engine.QueryInterface(ent, IID_Footprint);
+	if (!cmpFootprint)
+		return 50;
+
+	const shapeInfo = cmpFootprint.GetShape();
+
+	let halfExtent; // The radius of the entity (half its size)
+	if (shapeInfo && shapeInfo.type === "circle")
+		halfExtent = shapeInfo.radius || shapeInfo.size0;
+	else if (shapeInfo && shapeInfo.type === "square")
+		halfExtent = Math.max(shapeInfo.width || shapeInfo.size0, shapeInfo.depth || shapeInfo.size1) / 2;
+	else
+		return 50;
+
+	// Use 2x the entity's radius to reveal surrounding area
+	// This gives a comfortable margin around the entity
+	const radius = halfExtent * 2;
+	return radius;
+};
+
+/**
+ * Sends a notification to specific players.
+ *
+ * @param {string} message - The message to display (use markForTranslation)
+ * @param {number[]} players - Array of player IDs to send the notification to
+ * @param {number} duration - Duration in milliseconds
+ * @param {Object} parameters - Translation parameters (optional)
+ */
+TriggerHelper.SendNotification = function(message, players, duration = 30000, parameters = {}, translateParameters = [])
+{
+	const cmpGuiInterface = Engine.QueryInterface(SYSTEM_ENTITY, IID_GuiInterface);
+	if (!cmpGuiInterface)
+		return;
+
+	// Ensure all parameter values are primitive types
+	const primitiveParameters = {};
+	for (const key in parameters)
+	{
+		const value = parameters[key];
+		if (typeof value === "string" || typeof value === "number" || typeof value === "boolean")
+			primitiveParameters[key] = value;
+		else
+			primitiveParameters[key] = String(value);
+	}
+
+	cmpGuiInterface.AddTimeNotification(
+		{
+			"message": message,
+			"players": players,
+			"parameters": primitiveParameters,
+			"translateMessage": true,
+			"translateParameters": translateParameters
+		},
+		duration
+	);
+};
+
+/**
+ * Sends a notification to a specific player and a different notification to all other active players.
+ *
+ * @param {number} player - The player ID who gets the 'owner' message
+ * @param {string} ownerMessage - Message for the specified player (use markForTranslation)
+ * @param {string} othersMessage - Message for all other active players (use markForTranslation)
+ * @param {number} duration - Duration in milliseconds
+ * @param {Object} parameters - Translation parameters shared by both messages (optional)
+ * @param {Object} ownerParameters - Additional parameters for the owner message (optional)
+ * @param {Object} othersParameters - Additional parameters for the others message (optional)
+ */
+TriggerHelper.SendDualNotification = function(player, ownerMessage, othersMessage, duration = 30000, parameters = {}, ownerParameters = {}, othersParameters = {})
+{
+	const numPlayers = Engine.QueryInterface(SYSTEM_ENTITY, IID_PlayerManager).GetNumPlayers();
+
+	const others = [-1]; // Include observers (player id -1)
+	for (let playerID = 1; playerID < numPlayers; ++playerID)
+	{
+		if (playerID == player)
+			continue;
+		const cmpPlayer = QueryPlayerIDInterface(playerID);
+		if (cmpPlayer && cmpPlayer.GetState() == "defeated")
+			continue;
+		others.push(playerID);
+	}
+
+	const mergedOwnerParams = Object.assign({}, parameters, ownerParameters);
+	const mergedOthersParams = Object.assign({}, parameters, othersParameters);
+
+	// Auto-detect translatable parameters (those starting with "_" or named "player")
+	const translateParameters = Object.keys(mergedOthersParams).filter(key => key.startsWith("_") || key == "player");
+
+	TriggerHelper.SendNotification(ownerMessage, [player], duration, mergedOwnerParams, translateParameters);
+	TriggerHelper.SendNotification(othersMessage, others, duration, mergedOthersParams, translateParameters);
+};
+
+TriggerHelper.SendWonderNotifications = function(owner, othersMessage, ownerMessage)
+{
+	TriggerHelper.SendDualNotification(owner, ownerMessage, othersMessage, 30000, { "_player_": owner });
+};
+
 Engine.RegisterGlobal("TriggerHelper", TriggerHelper);

binaries/data/mods/public/maps/scripts/WonderVictory.js

@@ -1,16 +1,42 @@
 Trigger.prototype.WonderVictoryEntityRenamed = function(data)
 {
-	if (this.wonderVictoryMessages[data.entity] && Engine.QueryInterface(data.newentity, IID_Wonder))
+	if (!Engine.QueryInterface(data.newentity, IID_Wonder))
-	{
+		return;
-		// When an entity is renamed, we first create a new entity,
-		// which in case it is a wonder will receive a timer.
-		// However on a rename we want to use the timer from the old entity,
-		// so we need to remove the timer of the new entity.
-		this.WonderVictoryDeleteTimer(data.newentity);
 
+	// Check if wonder victory is enabled
+	const cmpEndGameManager = Engine.QueryInterface(SYSTEM_ENTITY, IID_EndGameManager);
+	if (!cmpEndGameManager)
+		return;
+
+	const victoryConditions = cmpEndGameManager.GetVictoryConditions();
+	if (!victoryConditions || !victoryConditions.includes("wonder"))
+		return;
+
+	// Handle timer transfer (only if old entity had the timer)
+	if (this.wonderVictoryMessages[data.entity])
+	{
+		this.WonderVictoryDeleteTimer(data.newentity);
 		this.wonderVictoryMessages[data.newentity] = this.wonderVictoryMessages[data.entity];
 		delete this.wonderVictoryMessages[data.entity];
 	}
+
+	// Make the completed wonder permanently visible
+	TriggerHelper.MakeEntityPermanentlyVisible(data.newentity);
+
+	// Send "wonder completed" notifications (only for non-Gaia wonders)
+	const cmpOwnership = Engine.QueryInterface(data.newentity, IID_Ownership);
+	if (cmpOwnership)
+	{
+		const owner = cmpOwnership.GetOwner();
+		if (owner > 0)
+		{
+			TriggerHelper.SendWonderNotifications(
+				owner,
+				markForTranslation("%(_player_)s has built a Wonder!"),
+				markForTranslation("You have built a Wonder!")
+			);
+		}
+	}
 };
 
 Trigger.prototype.WonderVictoryOwnershipChanged = function(data)
@@ -18,6 +44,15 @@ Trigger.prototype.WonderVictoryOwnershipChanged = function(data)
 	if (!Engine.QueryInterface(data.entity, IID_Wonder))
 		return;
 
+	// Check if wonder victory is enabled
+	const cmpEndGameManager = Engine.QueryInterface(SYSTEM_ENTITY, IID_EndGameManager);
+	if (!cmpEndGameManager)
+		return;
+
+	const victoryConditions = cmpEndGameManager.GetVictoryConditions();
+	if (!victoryConditions || !victoryConditions.includes("wonder"))
+		return;
+
 	this.WonderVictoryDeleteTimer(data.entity);
 
 	if (data.to > 0)
@@ -146,11 +181,69 @@ Trigger.prototype.WonderVictorySetWinner = function(playerID)
 			n));
 };
 
+Trigger.prototype.WonderStartNotification = function(data)
+{
+	// Check if wonder victory is enabled in game settings
+	const cmpEndGameManager = Engine.QueryInterface(SYSTEM_ENTITY, IID_EndGameManager);
+	if (!cmpEndGameManager)
+		return;
+
+	// Don't show the wonder foundation if it's not a wonder victory game
+	const victoryConditions = cmpEndGameManager.GetVictoryConditions();
+	if (!victoryConditions || !victoryConditions.includes("wonder"))
+		return;
+
+	const cmpTemplateManager = Engine.QueryInterface(SYSTEM_ENTITY, IID_TemplateManager);
+	if (!cmpTemplateManager)
+		return;
+
+	const template = cmpTemplateManager.GetTemplate(data.template);
+
+	if (!template || !("Wonder" in template))
+		return;
+
+	const owner = TriggerHelper.GetOwner(data.foundation);
+	if (owner <= 0)
+		return;
+
+	TriggerHelper.MakeEntityPermanentlyVisible(data.foundation);
+
+	TriggerHelper.SendWonderNotifications(
+		owner,
+		markForTranslation("%(_player_)s has started building a Wonder."),
+		markForTranslation("You have started building a Wonder.")
+	);
+};
+
+Trigger.prototype.RevealGaiaWonders = function()
+{
+	Engine.ProfileStart("RevealGaiaWonders");
+	const cmpEndGameManager = Engine.QueryInterface(SYSTEM_ENTITY, IID_EndGameManager);
+	if (!cmpEndGameManager)
+		return;
+
+	const victoryConditions = cmpEndGameManager.GetVictoryConditions();
+	if (!victoryConditions || !victoryConditions.includes("wonder"))
+		return;
+
+	// Find and reveal all Gaia wonders
+	const gaiaWonders = Engine.GetEntitiesWithInterface(IID_Wonder).filter(
+		ent => TriggerHelper.GetOwner(ent) === 0
+	);
+
+	for (const ent of gaiaWonders)
+		TriggerHelper.MakeEntityPermanentlyVisible(ent);
+
+	Engine.ProfileStop();
+};
+
 {
 	const cmpTrigger = Engine.QueryInterface(SYSTEM_ENTITY, IID_Trigger);
 	cmpTrigger.RegisterTrigger("OnEntityRenamed", "WonderVictoryEntityRenamed", { "enabled": true });
 	cmpTrigger.RegisterTrigger("OnOwnershipChanged", "WonderVictoryOwnershipChanged", { "enabled": true });
 	cmpTrigger.RegisterTrigger("OnDiplomacyChanged", "WonderVictoryDiplomacyChanged", { "enabled": true });
 	cmpTrigger.RegisterTrigger("OnPlayerWon", "WonderVictoryPlayerWon", { "enabled": true });
+	cmpTrigger.RegisterTrigger("OnConstructionStarted", "WonderStartNotification", { "enabled": true });
+	cmpTrigger.DoAfterDelay(0, "RevealGaiaWonders", {});
 	cmpTrigger.wonderVictoryMessages = {};
 }

binaries/data/mods/public/simulation/components/Fogging.js

@@ -29,6 +29,7 @@ Fogging.prototype.Init = function()
 	this.mirages = [];
 	this.miraged = [];
 	this.seen = [];
+	this.revealed = [];
 
 	const numPlayers = Engine.QueryInterface(SYSTEM_ENTITY, IID_PlayerManager).GetNumPlayers();
 	for (let player = 0; player < numPlayers; ++player)
@@ -36,6 +37,7 @@ Fogging.prototype.Init = function()
 		this.mirages.push(INVALID_ENTITY);
 		this.miraged.push(false);
 		this.seen.push(false);
+		this.revealed.push(false);
 	}
 };
 
@@ -169,6 +171,45 @@ Fogging.prototype.WasSeen = function(player)
 	return this.seen[player];
 };
 
+/**
+ * Permanently reveal this entity to one or all players.
+ * Destroys existing mirages and optionally deactivates fogging entirely.
+ * @param {number|string} player - Player ID to reveal to, or "all" for all players.
+ */
+Fogging.prototype.PermanentlyReveal = function(player = "all")
+{
+	const cmpRangeManager = Engine.QueryInterface(SYSTEM_ENTITY, IID_RangeManager);
+
+	// Validate single player case
+	if (player !== "all" && (player < 0 || player >= this.mirages.length))
+		return;
+
+	// Determine which players to reveal
+	const startPlayer = (player === "all") ? 0 : player;
+	const endPlayer = (player === "all") ? this.mirages.length : player + 1;
+
+	// Reveal each player in the range
+	for (let i = startPlayer; i < endPlayer; ++i)
+	{
+		if (this.mirages[i] != INVALID_ENTITY)
+		{
+			Engine.DestroyEntity(this.mirages[i]);
+			this.mirages[i] = INVALID_ENTITY;
+			this.miraged[i] = false;
+		}
+		this.revealed[i] = true;
+		this.seen[i] = true;
+	}
+
+	// Deactivate fogging if revealing to all players
+	if (player === "all")
+		this.activated = false;
+
+	// Request visibility update
+	if (cmpRangeManager)
+		cmpRangeManager.RequestVisibilityUpdate(this.entity);
+};
+
 Fogging.prototype.OnOwnershipChanged = function(msg)
 {
 	// Always activate fogging for non-Gaia entities.
@@ -209,7 +250,8 @@ Fogging.prototype.OnVisibilityChanged = function(msg)
 		this.seen[msg.player] = true;
 	}
 
-	if (msg.newVisibility == VIS_FOGGED && this.activated)
+	// Only create a mirage if the player hasn’t been permanently revealed
+	if (msg.newVisibility == VIS_FOGGED && this.activated && !this.revealed[msg.player])
 		this.LoadMirage(msg.player);
 };
 

binaries/data/mods/public/simulation/components/UnitAI.js

@@ -424,10 +424,42 @@ UnitAI.prototype.UnitFsmSpec = {
 
 	"Order.Attack": function(msg)
 	{
-		const type = this.GetBestAttackAgainst(msg.data.target, msg.data.allowCapture);
+		// Check if this is a group attack
-		if (!type)
+		const isGroupAttack = !!msg.data.targetArray;
-			return this.FinishOrder();
 
+		// For group attacks with invalid initial target, find one from the array
+		if (isGroupAttack && (!msg.data.target || msg.data.target === INVALID_ENTITY))
+		{
+			if (!this.FindAndSetNextTarget(msg.data))
+			{
+				this.FinishOrder();
+				return ACCEPT_ORDER;
+			}
+		}
+
+		// Get the attack type for the current target
+		const type = this.GetBestAttackAgainst(msg.data.target, msg.data.allowCapture);
+
+		if (!type)
+		{
+			// Current target can't be attacked
+			if (isGroupAttack)
+			{
+				if (this.FindAndSetNextTarget(msg.data))
+				{
+					msg.data.attackType = this.GetBestAttackAgainst(msg.data.target, msg.data.allowCapture);
+					if (msg.data.attackType)
+					{
+						this.SetNextState("INDIVIDUAL.COMBAT.ATTACKING");
+						return ACCEPT_ORDER;
+					}
+				}
+			}
+			this.FinishOrder();
+			return ACCEPT_ORDER;
+		}
+
+		// Set attackType before range check
 		msg.data.attackType = type;
 
 		this.RememberTargetPosition();
@@ -1366,6 +1398,12 @@ UnitAI.prototype.UnitFsmSpec = {
 				// Wait for individual members to finish
 				"enter": function(msg)
 				{
+					if (this.order.data.targetArray)
+					{
+						// For group attacks, we're done once we distributed targets
+						this.FinishOrder();
+						return true;
+					}
 					const target = this.order.data.target;
 					if (!this.CheckFormationTargetAttackRange(target))
 					{
@@ -1602,6 +1640,26 @@ UnitAI.prototype.UnitFsmSpec = {
 	"INDIVIDUAL": {
 		"Attacked": function(msg)
 		{
+			// First, check if we have a group attack order and the attacker is in our target array
+			if (this.order?.type === "Attack" &&
+				this.order.data?.targetArray?.includes(msg.data.attacker))
+			{
+				// Switch to attack the entity that's attacking us
+				this.order.data.target = msg.data.attacker;
+				this.order.data.attackType = this.GetBestAttackAgainst(msg.data.attacker, this.order.data.allowCapture);
+
+				// Update the current target index
+				const currentIndex = this.order.data.targetArray.indexOf(msg.data.attacker);
+				if (currentIndex !== -1)
+					this.order.data.currentTargetIndex = currentIndex;
+
+				// Make sure we're in the right state to handle this
+				const currentState = this.GetCurrentState();
+				if (currentState === "INDIVIDUAL.IDLE" || currentState === "INDIVIDUAL.WALKING")
+					this.SetNextState("INDIVIDUAL.COMBAT.APPROACHING");
+				return;
+			}
+
 			if (this.GetStance().targetAttackersAlways || !this.order || !this.order.data || !this.order.data.force)
 				this.RespondToTargetedEntities([msg.data.attacker]);
 		},
@@ -2150,6 +2208,35 @@ UnitAI.prototype.UnitFsmSpec = {
 
 			"Attacked": function(msg)
 			{
+				// Check if we're doing a group attack and the attacker is in our target array
+				if (!this.order.data.targetArray ||
+						!this.order.data.targetArray.includes(msg.data.attacker) ||
+						msg.data.attacker === this.order.data.target)
+					return;
+
+				// Switch to attack the entity that's attacking us
+				this.order.data.target = msg.data.attacker;
+				this.order.data.attackType = this.GetBestAttackAgainst(msg.data.attacker, this.order.data.allowCapture);
+
+				// Update the current target index
+				const currentIndex = this.order.data.targetArray.indexOf(msg.data.attacker);
+				if (currentIndex !== -1)
+					this.order.data.currentTargetIndex = currentIndex;
+
+				// Re-evaluate our approach to the new target
+				if (this.CheckTargetAttackRange(this.order.data.target, this.order.data.attackType))
+				{
+					if (this.CanUnpack())
+					{
+						this.PushOrderFront("Unpack", { "force": true });
+						return;
+					}
+					this.SetNextState("ATTACKING");
+				}
+				// Continue approaching the new target
+				else if (!this.MoveToTargetAttackRange(this.order.data.target, this.order.data.attackType))
+					this.FinishOrder();
+
 				// If we're already in combat mode, ignore anyone else who's attacking us
 				// unless it's a melee attack since they may be blocking our way to the target
 				if (msg.data.type == "Melee" && (this.GetStance().targetAttackersAlways || !this.order.data.force))
@@ -2209,7 +2296,23 @@ UnitAI.prototype.UnitFsmSpec = {
 
 				"MovementUpdate": function(msg)
 				{
-					if (msg.likelyFailure)
+					if (!msg.likelyFailure)
+					{
+						if (!this.CheckTargetAttackRange(this.order.data.target, this.order.data.attackType))
+							return;
+
+						if (this.CanUnpack())
+						{
+							this.PushOrderFront("Unpack", { "force": true });
+							return;
+						}
+
+						this.SetNextState("ATTACKING");
+						return;
+					}
+
+					// For group attacks, try next target instead of moving to last position
+					if (!this.order.data.targetArray || this.order.data.currentTargetIndex === undefined)
 					{
 						// This also handles hunting.
 						if (this.orderQueue.length > 1)
@@ -2217,11 +2320,13 @@ UnitAI.prototype.UnitFsmSpec = {
 							this.FinishOrder();
 							return;
 						}
-						else if (!this.order.data.force || !this.order.data.lastPos)
+
+						if (!this.order.data.force || !this.order.data.lastPos)
 						{
 							this.SetNextState("COMBAT.FINDINGNEWTARGET");
 							return;
 						}
+
 						// If the order was forced, try moving to the target position,
 						// under the assumption that this is desirable if the target
 						// was somewhat far away - we'll likely end up closer to where
@@ -2234,21 +2339,30 @@ UnitAI.prototype.UnitFsmSpec = {
 						return;
 					}
 
-					if (this.CheckTargetAttackRange(this.order.data.target, this.order.data.attackType))
+					// Handle group attack case
+					// Remove current unreachable target from array
+					const currentIndex = this.order.data.currentTargetIndex;
+					if (currentIndex < this.order.data.targetArray.length)
+						this.order.data.targetArray.splice(currentIndex, 1);
+
+					// Try to find next valid target
+					if (this.order.data.targetArray.length === 0 || !this.FindAndSetNextTarget(this.order.data))
 					{
-						if (this.CanUnpack())
+						this.FinishOrder();
-						{
+						return;
-							this.PushOrderFront("Unpack", { "force": true });
-							return;
-						}
-						this.SetNextState("ATTACKING");
 					}
-					else if (msg.likelySuccess)
+
-						// Try moving again,
+					this.order.data.attackType = this.GetBestAttackAgainst(this.order.data.target, this.order.data.allowCapture);
-						// attack range uses a height-related formula and our actual max range might have changed.
+
-						if (!this.MoveToTargetAttackRange(this.order.data.target, this.order.data.attackType))
+					// Try approaching the new target
-							this.FinishOrder();
+					if (this.MoveToTargetAttackRange(this.order.data.target, this.order.data.attackType))
-				},
+						return;
+
+					// If we can't approach the new target either, remove it and continue
+					this.order.data.targetArray.splice(this.order.data.currentTargetIndex, 1);
+					if (this.order.data.targetArray.length === 0)
+						this.FinishOrder();
+				}
 			},
 
 			"ATTACKING": {
@@ -2322,6 +2436,18 @@ UnitAI.prototype.UnitFsmSpec = {
 
 				"OutOfRange": function()
 				{
+					// Check if the target is garrisoned or in a turret (turreted entities cannot be attacked by melee units)
+					const cmpTargetUnitAI = Engine.QueryInterface(this.order.data.target, IID_UnitAI);
+					const isTargetGarrisoned = cmpTargetUnitAI && cmpTargetUnitAI.isGarrisoned;
+					const isTargetInTurret = cmpTargetUnitAI && cmpTargetUnitAI.IsTurret();
+
+					// If target is garrisoned or in a turret (and we're not ranged), treat as invalid
+					if (isTargetGarrisoned || (isTargetInTurret && this.order.data.attackType !== "Ranged"))
+					{
+						this.ProcessMessage("TargetInvalidated");
+						return;
+					}
+
 					if (this.ShouldChaseTargetedEntity(this.order.data.target, this.order.data.force))
 					{
 						if (this.CanPack())
@@ -2332,11 +2458,53 @@ UnitAI.prototype.UnitFsmSpec = {
 						this.SetNextState("CHASING");
 						return;
 					}
+
+					// For group attacks, try next target instead of finding new ones
+					if (this.order.data.targetArray && this.order.data.currentTargetIndex !== undefined)
+					{
+						const currentIndex = this.order.data.currentTargetIndex;
+
+						// Remove current target since it's out of range and we can't chase
+						this.order.data.targetArray.splice(currentIndex, 1);
+
+						// Try to find next valid target in sequence
+						if (this.order.data.targetArray.length > 0 && this.FindAndSetNextTarget(this.order.data))
+						{
+							this.order.data.attackType = this.GetBestAttackAgainst(this.order.data.target, this.order.data.allowCapture);
+							this.SetNextState("INDIVIDUAL.COMBAT.ATTACKING");
+							return;
+						}
+					}
+
 					this.SetNextState("FINDINGNEWTARGET");
 				},
 
 				"TargetInvalidated": function()
 				{
+					// For group attacks, remove current target and move to next in array
+					if (this.order.data.targetArray && this.order.data.currentTargetIndex !== undefined)
+					{
+						// Remove the current target from the array
+						const currentIndex = this.order.data.currentTargetIndex;
+						if (currentIndex < this.order.data.targetArray.length)
+						{
+							this.order.data.targetArray.splice(currentIndex, 1);
+
+							// If we have more targets, continue with the next one
+							if (this.order.data.targetArray.length > 0)
+							{
+								// Try to find next valid target in sequence
+								if (this.FindAndSetNextTarget(this.order.data))
+								{
+									this.order.data.attackType = this.GetBestAttackAgainst(this.order.data.target, this.order.data.allowCapture);
+									this.SetNextState("INDIVIDUAL.COMBAT.ATTACKING");
+									return;
+								}
+							}
+						}
+					}
+
+					// No more targets or not a group attack - use original behavior
 					this.SetNextState("FINDINGNEWTARGET");
 				},
 
@@ -2360,7 +2528,26 @@ UnitAI.prototype.UnitFsmSpec = {
 
 				"enter": function()
 				{
-					// Check if we are attacking a formation.
+					// First, check if we have pending targets in a group attack
+					if (this.order.data.targetArray && this.order.data.currentTargetIndex !== undefined)
+					{
+						// Try to find next valid target from the array
+						if (this.FindAndSetNextTarget(this.order.data))
+						{
+							this.order.data.attackType = this.GetBestAttackAgainst(this.order.data.target, this.order.data.allowCapture);
+							this.SetNextState("COMBAT.ATTACKING");
+							return true;
+						}
+
+						// No valid targets in array - clean up and continue with normal behavior
+						this.order.data.targetArray = [];
+						this.order.data.currentTargetIndex = undefined;
+					}
+
+					if (!this.order.data.target)
+						return false;
+
+					// Try to find the formation the target was a part of.
 					let cmpFormation = Engine.QueryInterface(this.order.data.target, IID_Formation);
 					if (cmpFormation)
 						this.order.data.formationTarget = this.order.data.target;
@@ -2468,6 +2655,12 @@ UnitAI.prototype.UnitFsmSpec = {
 				{
 					if (msg.likelyFailure)
 					{
+						// If this is a group attack with pending targets, try the next one
+						if (this.order.data.targetArray && this.order.data.targetArray.length > 0)
+						{
+							this.SetNextState("COMBAT.FINDINGNEWTARGET");
+							return;
+						}
 						// This also handles hunting.
 						if (this.orderQueue.length > 1)
 						{
@@ -3887,6 +4080,9 @@ UnitAI.prototype.OnOwnershipChanged = function(msg)
 
 UnitAI.prototype.OnDestroy = function()
 {
+	// Clean up all group attack states before destruction
+	this.CleanupAllGroupAttackStates();
+
 	// Switch to an empty state to let states execute their leave handlers.
 	this.UnitFsm.SwitchToNextState(this, "");
 
@@ -4093,6 +4289,9 @@ UnitAI.prototype.FsmStateNameChanged = function(state)
  */
 UnitAI.prototype.FinishOrder = function()
 {
+	// Clean up any group attack state before removing order
+	this.CleanupGroupAttackState(this.order);
+
 	if (!this.orderQueue.length)
 	{
 		const stack = new Error().stack.trimRight().replace(/^/mg, '  '); // indent each line
@@ -4318,15 +4517,24 @@ UnitAI.prototype.ReplaceOrder = function(type, data)
 		const idx = this.orderQueue.findIndex(o => o.type == "LeaveFormation");
 		if (idx === -1)
 		{
+			// Clean up all queued orders before clearing them
+			this.CleanupAllGroupAttackStates();
 			this.orderQueue = [];
 			this.order = undefined;
 		}
 		else
+		{
+			// Clean up orders being discarded
+			for (let i = 0; i < idx; ++i)
+				this.CleanupGroupAttackState(this.orderQueue[i]);
 			this.orderQueue.splice(0, idx);
+		}
 		this.PushOrderFront(type, data);
 	}
 	else
 	{
+		// Clean up all queued orders before clearing them
+		this.CleanupAllGroupAttackStates();
 		this.orderQueue = [];
 		this.PushOrder(type, data);
 	}
@@ -4405,6 +4613,7 @@ UnitAI.prototype.BackToWork = function()
 	if (this.IsTurret(cmpTurretable) && !cmpTurretable.LeaveTurret())
 		return false;
 
+	this.CleanupAllGroupAttackStates();
 	this.orderQueue = [];
 
 	this.AddOrders(this.workOrders);
@@ -5060,6 +5269,9 @@ UnitAI.prototype.CheckTargetRange = function(target, iid, type)
  */
 UnitAI.prototype.CheckTargetAttackRange = function(target, type)
 {
+	if (!target || target === INVALID_ENTITY || !type)
+		return false;
+
 	// for formation members, the formation will take care of the range check
 	if (this.IsFormationMember())
 	{
@@ -5793,6 +6005,75 @@ UnitAI.prototype.Attack = function(target, allowCapture = this.DEFAULT_CAPTURE,
 	this.AddOrder("Attack", order, queued, pushFront);
 };
 
+/**
+ * Adds a group attack order to the queue.
+ * Used when some unit(s) are ordered to attack multiple targets.
+ * Each unit receives the full target list (from Commands) but starts at a different position
+ * based on the startingIndex in the attacking group.
+ *
+ * @param {Array} targets - Array of target entity IDs to attack (pre-sorted by distance)
+ * @param {number} startingIndex - This unit's position in the attacking group (0-based)
+ * @param {number} unitCount - Total number of units in the attacking group
+ * @param {boolean} allowCapture - Whether capturing is allowed
+ * @param {boolean} queued - If true, add to end of queue instead of replacing current order
+ * @param {boolean} pushFront - If true, add to front of queue (interrupt current order)
+ */
+UnitAI.prototype.AttackGroup = function(targets, startingIndex, unitCount, allowCapture = this.DEFAULT_CAPTURE, queued = false, pushFront = false)
+{
+	if (!targets?.length)
+		return;
+
+	// Check if adding these targets would exceed the limit
+	const currentTotal = this.CountTotalTargetsInQueue();
+	const newTargetCount = targets.length;
+
+	if (currentTotal + newTargetCount > this.MAX_TOTAL_TARGETS)
+	{
+		// Trim the targets to fit within the limit
+		const allowedNewTargets = Math.max(0, this.MAX_TOTAL_TARGETS - currentTotal);
+		if (allowedNewTargets === 0)
+			return;
+
+		// Trim the target array
+		targets = targets.slice(0, allowedNewTargets);
+
+		// If trimming results in no targets, just return
+		if (targets.length === 0)
+			return;
+	}
+
+	// If this unit is in a formation, move the formation controller out of the world
+	// This prevents the controller from staying at the coordinates where the units received the order
+	// That can potentially be far apart from where the fighting will occur.
+	// Result: The formation will reform into a more logical position once members are done (idle).
+	this.MoveFormationControllerOutOfWorld();
+
+	const stride = targets.length / unitCount;
+	const startIdx = Math.min(Math.round((startingIndex + 0.5) * stride), targets.length - 1);
+
+	const order = {
+		"force": true,
+		"allowCapture": allowCapture,
+		"targetArray": targets.slice(),
+		"target": INVALID_ENTITY,
+		"currentTargetIndex": startIdx,
+		"originalFirstTarget": targets[0],
+	};
+
+	this.RememberTargetPosition(order);
+	this.AddOrder("Attack", order, queued, pushFront);
+};
+
+UnitAI.prototype.MoveFormationControllerOutOfWorld = function()
+{
+	if (!this.IsFormationMember() || !this.formationController)
+		return;
+
+	const cmpControllerPosition = Engine.QueryInterface(this.formationController, IID_Position);
+	if (cmpControllerPosition?.IsInWorld())
+		cmpControllerPosition.MoveOutOfWorld();
+};
+
 /**
  * Adds garrison order to the queue, forced by the player.
  */
@@ -6726,6 +7007,72 @@ UnitAI.prototype.AttackEntitiesByPreference = function(ents)
 	return this.RespondToTargetedEntities(entsWithoutPref);
 };
 
+UnitAI.prototype.FindAndSetNextTarget = function(data)
+{
+	if (!this.EnsureValidTargetIndex(data))
+		return false;
+
+	const startIdx = data.currentTargetIndex;
+	const currentTarget = data.targetArray[startIdx];
+
+	// First check the starting target
+	if (this.CanAttack(currentTarget) && this.CheckTargetVisible(currentTarget))
+		return this.SetNextTarget(data, startIdx);
+
+	// Search forward using find
+	const forwardFound = data.targetArray
+		.slice(startIdx + 1)
+		.findIndex((target, i) =>
+			this.CanAttack(target) && this.CheckTargetVisible(target)
+		);
+
+	if (forwardFound !== -1)
+		return this.SetNextTarget(data, startIdx + 1 + forwardFound);
+
+	// Search backward using find
+	const backwardFound = data.targetArray
+		.slice(0, startIdx)
+		.reverse()
+		.findIndex((target, i) =>
+			this.CanAttack(target) && this.CheckTargetVisible(target)
+		);
+
+	if (backwardFound !== -1)
+	{
+		// Convert reverse index back to original index
+		const originalIndex = startIdx - 1 - backwardFound;
+		return this.SetNextTarget(data, originalIndex);
+	}
+
+	return false;
+};
+
+UnitAI.prototype.SetNextTarget = function(data, index)
+{
+	const target = data.targetArray[index];
+	data.target = target;
+	data.attackType = this.GetBestAttackAgainst(target, data.allowCapture);
+	data.currentTargetIndex = index;
+	return true;
+};
+
+UnitAI.prototype.EnsureValidTargetIndex = function(data)
+{
+	if (!data.targetArray || data.currentTargetIndex === undefined)
+		return false;
+
+	// If array is empty, clear the index
+	if (data.targetArray.length === 0)
+	{
+		data.currentTargetIndex = undefined;
+		return false;
+	}
+
+	data.currentTargetIndex = Math.clamp(data.currentTargetIndex, 0, data.targetArray.length - 1);
+
+	return true;
+};
+
 /**
  * Call UnitAI.funcname(args) on all formation members.
  * @param resetFinishedEntities - If true, call ResetFinishedEntities first.
@@ -6837,6 +7184,50 @@ UnitAI.prototype.ResetObstructionMitigationFlag = function()
 	delete this.obstructionMitigationAttempted;
 };
 
+/**
+ * Counts the total number of target entities across all queued orders.
+ * This includes targetArray from group attacks and single targets.
+ * Each target reference is counted separately, even if the same entity
+ * appears in multiple orders or in both targetArray and target.
+ * @returns {number} - Total number of target entity references in the order queue
+ */
+UnitAI.prototype.CountTotalTargetsInQueue = function()
+{
+	let total = 0;
+	for (const order of this.orderQueue)
+	{
+		if (order.data)
+		{
+			// Count group attack targets
+			if (order.data.targetArray && Array.isArray(order.data.targetArray))
+				total += order.data.targetArray.length;
+
+			// Add single target for consistency
+			if (order.data.target && order.data.target !== INVALID_ENTITY)
+				total++;
+		}
+	}
+	return total;
+};
+
+UnitAI.prototype.CleanupGroupAttackState = function(order)
+{
+	if (order?.data?.targetArray)
+	{
+		delete order.data.targetArray;
+		delete order.data.currentTargetIndex;
+	}
+};
+
+UnitAI.prototype.CleanupAllGroupAttackStates = function()
+{
+	for (const order of this.orderQueue)
+		this.CleanupGroupAttackState(order);
+};
+
+// Maximum number of target entities allowed across all queued orders
+UnitAI.prototype.MAX_TOTAL_TARGETS = 1000;
+
 UnitAI.prototype.UnitFsm = new FSM(UnitAI.prototype.UnitFsmSpec);
 
 Engine.RegisterComponentType(IID_UnitAI, "UnitAI", UnitAI);

binaries/data/mods/public/simulation/components/tests/test_UnitAI.js

@@ -138,6 +138,7 @@ function TestFormationExiting(mode)
 		"ResetActiveQuery": function(id) { if (mode == 0) return []; return [enemy]; },
 		"DisableActiveQuery": function(id) { },
 		"GetEntityFlagMask": function(identifier) { },
+		"GetLosVisibility": (ent, player) => "visible"
 	});
 
 	AddMock(SYSTEM_ENTITY, IID_TemplateManager, {
@@ -319,8 +320,11 @@ function TestMoveIntoFormationWhileAttacking()
 		"ResetActiveQuery": function(id) { return [enemy]; },
 		"DisableActiveQuery": function(id) { },
 		"GetEntityFlagMask": function(identifier) { },
+		"GetLosVisibility": (target, player) => "visible",
+		"GetLosVisibilityPosition": (x, z, player) => "visible"
 	});
 
+
 	AddMock(SYSTEM_ENTITY, IID_TemplateManager, {
 		"GetCurrentTemplateName": function(ent) { return "special/formations/line_closed"; },
 	});
@@ -406,6 +410,10 @@ function TestMoveIntoFormationWhileAttacking()
 		"GetHitpoints": function() { return 40; },
 	});
 
+	AddMock(enemy, IID_Ownership, {
+		"GetOwner": () => 2 // Different player ID (enemy)
+	});
+
 	const controllerFormation = ConstructComponent(controller, "Formation", {
 		"FormationShape": "square",
 		"ShiftRows": "false",
@@ -421,6 +429,10 @@ function TestMoveIntoFormationWhileAttacking()
 		"DefaultStance": "aggressive"
 	});
 
+	AddMock(controller, IID_Ownership, {
+		"GetOwner": () => 1
+	});
+
 	AddMock(controller, IID_Position, {
 		"GetTurretParent": () => INVALID_ENTITY,
 		"JumpTo": function(x, z) { this.x = x; this.z = z; },
@@ -458,7 +470,7 @@ function TestMoveIntoFormationWhileAttacking()
 
 	controllerFormation.SetMembers(units);
 
-	controllerAI.Attack(enemy, []);
+	controllerAI.Attack(enemy);
 
 	for (const ent of unitAIs)
 		TS_ASSERT_EQUALS(unitAI.fsmStateName, "INDIVIDUAL.COMBAT.ATTACKING");
@@ -889,4 +901,362 @@ function TestAttemptObstructionMitigation()
 	})();
 }
 
-TestAttemptObstructionMitigation();
+TestAttemptObstructionMitigation();
+function TestFindAndSetNextTargetBehavior()
+{
+	ResetState();
+
+	const attacker = 10;
+	const targets = [20, 21, 22, 23, 24]; // Multiple targets for comprehensive testing
+
+	// Basic mocks needed for unitAI creation
+	AddMock(SYSTEM_ENTITY, IID_Timer, {
+		"SetInterval": () => {},
+		"SetTimeout": () => {}
+	});
+
+	AddMock(SYSTEM_ENTITY, IID_RangeManager, {
+		"CreateActiveQuery": () => 1,
+		"EnableActiveQuery": () => {},
+		"ResetActiveQuery": () => [],
+		"DisableActiveQuery": () => {},
+		"GetEntityFlagMask": () => 0
+	});
+
+	AddMock(SYSTEM_ENTITY, IID_ObstructionManager, {
+		"IsInTargetRange": () => false
+	});
+
+	// Create the unitAI component
+	const unitAI = ConstructComponent(attacker, "UnitAI", {
+		"FormationController": "false",
+		"DefaultStance": "aggressive"
+	});
+
+	AddMock(attacker, IID_Attack, {
+		"GetBestAttackAgainst": () => "Melee"
+	});
+
+	unitAI.OnCreate();
+
+	// Mock the visibility and attackability checks
+	unitAI.CanAttack = (target) =>
+	{
+		// Target 21 is always unattackable (e.g., garrisoned, dead, etc.)
+		return target !== 21;
+	};
+
+	unitAI.CheckTargetVisible = (target) =>
+	{
+		// Target 22 is always not visible
+		return target !== 22;
+	};
+
+	// First target is valid
+	(function()
+	{
+		const data = {
+			"targetArray": [20, 21, 22, 23, 24],
+			"currentTargetIndex": 0, // Currently targeting 20
+			"target": 20,
+			"allowCapture": false
+		};
+
+		const found = unitAI.FindAndSetNextTarget(data);
+		TS_ASSERT(found);
+		TS_ASSERT_EQUALS(data.target, 20);
+		TS_ASSERT_EQUALS(data.currentTargetIndex, 0);
+	})();
+
+	// End of array behavior
+	(function()
+	{
+		const data = {
+			"targetArray": [18, 19, 20, 21, 22],
+			"currentTargetIndex": 2, // Currently targeting 22
+			"allowCapture": false
+		};
+
+		// 21 and 22 are invalid, should go backward and find 20
+		const found = unitAI.FindAndSetNextTarget(data);
+		TS_ASSERT(found);
+		TS_ASSERT_EQUALS(data.target, 20); // Should be assigned targetArray[initialTarget - 1]
+	})();
+
+	// No valid targets found
+	(function()
+	{
+		const data = {
+			"targetArray": [21, 22], // Both are invalid (21 unattackable, 22 not visible)
+			"currentTargetIndex": 0,
+			"target": 21,
+			"allowCapture": false
+		};
+
+		const found = unitAI.FindAndSetNextTarget(data);
+		TS_ASSERT(!found);
+		TS_ASSERT_EQUALS(data.target, 21); // Should remain unchanged
+		TS_ASSERT_EQUALS(data.currentTargetIndex, 0);
+	})();
+
+	// Empty target array
+	(function()
+	{
+		const data = {
+			"targetArray": [],
+			"currentTargetIndex": 0,
+			"target": 20,
+			"allowCapture": false
+		};
+
+		const found = unitAI.FindAndSetNextTarget(data);
+		TS_ASSERT(!found);
+		TS_ASSERT_EQUALS(data.target, 20); // Should remain unchanged
+		TS_ASSERT_EQUALS(data.currentTargetIndex, void 0); // Should nullify currentTargetIndex
+	})();
+
+	// Current target is last in array
+	(function()
+	{
+		const data = {
+			"targetArray": [20, 21, 22, 23, 24],
+			"currentTargetIndex": 4, // Currently targeting 24 (last element)
+			"allowCapture": false
+		};
+
+		const found = unitAI.FindAndSetNextTarget(data);
+		TS_ASSERT(found);
+		TS_ASSERT_EQUALS(data.target, 24); // Should remain unchanged
+		TS_ASSERT_EQUALS(data.currentTargetIndex, 4);
+	})();
+
+	// Single invalid target
+	(function()
+	{
+		const data = {
+			"targetArray": [21], // Only one target, which is invalid
+			"currentTargetIndex": 0,
+			"allowCapture": false
+		};
+
+		const found = unitAI.FindAndSetNextTarget(data);
+		TS_ASSERT(!found);
+	})();
+
+	// Verify if we don't do more calls then necessary
+	(function()
+	{
+		const searchOrder = [];
+
+		unitAI.CanAttack = (target) =>
+		{
+			searchOrder.push(target);
+			return target == 20;
+		};
+
+		unitAI.CheckTargetVisible = (target) => true; // All visible
+
+		const data = {
+			"targetArray": [20, 21, 22, 23],
+			"currentTargetIndex": 1, // Currently targeting 21
+			"allowCapture": false
+		};
+
+		const found = unitAI.FindAndSetNextTarget(data);
+		TS_ASSERT(found);
+		TS_ASSERT_EQUALS(searchOrder.length, 4); // Should find at 20 (4 calls)
+
+	})();
+}
+
+TestFindAndSetNextTargetBehavior();
+
+function TestAttackGroupBehavior()
+{
+	ResetState();
+
+	const attacker1 = 100;
+	const attacker2 = 101;
+	const targets = [200, 201, 202, 203, 204];
+
+	// Basic mocks needed for unitAI creation
+	AddMock(SYSTEM_ENTITY, IID_Timer, {
+		"SetInterval": () => {},
+		"SetTimeout": () => {}
+	});
+
+	AddMock(SYSTEM_ENTITY, IID_RangeManager, {
+		"CreateActiveQuery": () => 1,
+		"EnableActiveQuery": () => {},
+		"ResetActiveQuery": () => [],
+		"DisableActiveQuery": () => {},
+		"GetEntityFlagMask": () => 0
+	});
+
+	AddMock(SYSTEM_ENTITY, IID_ObstructionManager, {
+		"IsInTargetRange": () => false
+	});
+
+	// Create two unitAI components
+	const unitAI1 = ConstructComponent(attacker1, "UnitAI", {
+		"FormationController": "false",
+		"DefaultStance": "aggressive"
+	});
+
+	const unitAI2 = ConstructComponent(attacker2, "UnitAI", {
+		"FormationController": "false",
+		"DefaultStance": "aggressive"
+	});
+
+	AddMock(attacker1, IID_Attack, {
+		"GetBestAttackAgainst": () => "Melee"
+	});
+
+	AddMock(attacker2, IID_Attack, {
+		"GetBestAttackAgainst": () => "Melee"
+	});
+
+	unitAI1.OnCreate();
+	unitAI2.OnCreate();
+
+	// Basic AttackGroup distribution
+	(function()
+	{
+		let orderAdded1 = null;
+		let orderAdded2 = null;
+
+		// Mock AddOrder to capture what orders are created
+		unitAI1.AddOrder = (type, data, queued, pushFront) =>
+		{
+			orderAdded1 = { type, data, queued, pushFront };
+		};
+
+		unitAI2.AddOrder = (type, data, queued, pushFront) =>
+		{
+			orderAdded2 = { type, data, queued, pushFront };
+		};
+
+		// Call AttackGroup for both units
+		unitAI1.AttackGroup(targets, 0, 2, false, false, false);
+		unitAI2.AttackGroup(targets, 1, 2, false, false, false);
+
+		// Verify unit1's order
+		TS_ASSERT(orderAdded1);
+		TS_ASSERT_EQUALS(orderAdded1.type, "Attack");
+		TS_ASSERT_EQUALS(orderAdded1.data.targetArray.length, 5);
+		TS_ASSERT_EQUALS(orderAdded1.data.target, INVALID_ENTITY);
+		// Unit 0 should start at position 1 ==> Math.round((0 + 0.5) * 2.5) = Math.round(1.25) = 1
+		TS_ASSERT_EQUALS(orderAdded1.data.currentTargetIndex, 1);
+
+		// Verify unit2's order
+		TS_ASSERT(orderAdded2);
+		TS_ASSERT_EQUALS(orderAdded2.type, "Attack");
+		TS_ASSERT_EQUALS(orderAdded2.data.targetArray.length, 5);
+		TS_ASSERT_EQUALS(orderAdded2.data.target, INVALID_ENTITY);
+		// Unit 1 should start at position 4 ==> Math.round((1 + 0.5) * 2.5) = Math.round(3.75) = 4
+		TS_ASSERT_EQUALS(orderAdded2.data.currentTargetIndex, 4);
+	})();
+
+	// More units than targets
+	(function()
+	{
+		let orderAdded1 = null;
+		let orderAdded2 = null;
+		let orderAdded3 = null;
+
+		const unitAI3 = ConstructComponent(102, "UnitAI", {
+			"FormationController": "false",
+			"DefaultStance": "aggressive"
+		});
+		AddMock(102, IID_Attack, { "GetBestAttackAgainst": () => "Melee" });
+		unitAI3.OnCreate();
+
+		unitAI1.AddOrder = (type, data, queued, pushFront) =>
+		{
+			orderAdded1 = { type, data, queued, pushFront };
+		};
+		unitAI2.AddOrder = (type, data, queued, pushFront) =>
+		{
+			orderAdded2 = { type, data, queued, pushFront };
+		};
+		unitAI3.AddOrder = (type, data, queued, pushFront) =>
+		{
+			orderAdded3 = { type, data, queued, pushFront };
+		};
+
+		const smallTargets = [300, 301];
+
+		unitAI1.AttackGroup(smallTargets, 0, 3, true, true, false);
+		unitAI2.AttackGroup(smallTargets, 1, 3, true, true, false);
+		unitAI3.AttackGroup(smallTargets, 2, 3, true, true, false);
+
+		// Verify distribution when more units than targets
+		TS_ASSERT(orderAdded1);
+		TS_ASSERT_EQUALS(orderAdded1.data.currentTargetIndex, 0); // 0 * 2 / 3 = 0
+		TS_ASSERT_EQUALS(orderAdded1.data.allowCapture, true);
+		TS_ASSERT_EQUALS(orderAdded1.queued, true);
+
+		TS_ASSERT(orderAdded2);
+		TS_ASSERT_EQUALS(orderAdded2.data.currentTargetIndex, 1); // 1 * 2 / 3 = 0.66, round = 1
+		TS_ASSERT(orderAdded2.data.currentTargetIndex < smallTargets.length);
+
+		TS_ASSERT(orderAdded3);
+		TS_ASSERT_EQUALS(orderAdded3.data.currentTargetIndex, 1); // 2 * 2 / 3 = 1.33, round = 1
+		TS_ASSERT(orderAdded3.data.currentTargetIndex < smallTargets.length);
+	})();
+
+	// Edge case - single target
+	(function()
+	{
+		let orderAdded = null;
+		unitAI1.AddOrder = (type, data, queued, pushFront) =>
+		{
+			orderAdded = { type, data, queued, pushFront };
+		};
+
+		const singleTarget = [400];
+
+		unitAI1.AttackGroup(singleTarget, 0, 1, false, false, true);
+
+		TS_ASSERT(orderAdded);
+		TS_ASSERT_EQUALS(orderAdded.data.targetArray.length, 1);
+		TS_ASSERT_EQUALS(orderAdded.data.currentTargetIndex, 0);
+		TS_ASSERT_EQUALS(orderAdded.pushFront, true);
+	})();
+
+	// Empty targets array should do nothing
+	(function()
+	{
+		let callCount = 0;
+		unitAI1.AddOrder = () => { callCount++; };
+
+		unitAI1.AttackGroup([], 0, 1);
+		TS_ASSERT_EQUALS(callCount, 0);
+
+		unitAI1.AttackGroup(null, 0, 1);
+		TS_ASSERT_EQUALS(callCount, 0);
+
+		unitAI1.AttackGroup(undefined, 0, 1);
+		TS_ASSERT_EQUALS(callCount, 0);
+	})();
+
+	// Verify RememberTargetPosition is called
+	(function()
+	{
+		let rememberedOrder = null;
+		unitAI1.RememberTargetPosition = (order) =>
+		{
+			rememberedOrder = order;
+		};
+
+		unitAI1.AddOrder = () => {};
+
+		const testTargets = [500, 501];
+		unitAI1.AttackGroup(testTargets, 0, 1);
+
+		TS_ASSERT(rememberedOrder);
+		TS_ASSERT_EQUALS(rememberedOrder.targetArray.length, 2);
+	})();
+}
+
+TestAttackGroupBehavior();

binaries/data/mods/public/simulation/data/auras/units/catafalques/athen_catafalque_2.json

@@ -8,5 +8,5 @@
 		{ "value": "Researcher/TechCostMultiplier/metal", "multiply": 0.9 }
 	],
 	"auraName": "Economic Fortune",
-	"auraDescription": "Solon brought in a new system of weights and measures, fathers were encouraged to find trades for their sons.\nEconomic technologies −10% resource costs."
+	"auraDescription": "Solon brought in a new system of weights and measures, and fathers were encouraged to find trades for their sons.\nEconomic technologies −10% resource costs."
 }

binaries/data/mods/public/simulation/data/auras/units/catafalques/han_catafalque_1.json

@@ -5,5 +5,5 @@
 		{ "value": "TerritoryInfluence/Radius", "multiply": 1.2 }
 	],
 	"auraName": "Territorial Expansion",
-	"auraDescription": "At its height, the Empire's borders spanned from the Fergana Valley in the west, to Korea in the east, and to northern Vietnam in the south.\nTerritory influence bonus +20%."
+	"auraDescription": "At its height, the Empire's borders spanned from the Fergana Valley in the west to Korea in the east and to northern Vietnam in the south.\nTerritory influence bonus +20%."
 }

binaries/data/mods/public/simulation/data/auras/units/catafalques/rome_catafalque_2.json

@@ -7,5 +7,5 @@
 		{ "value": "Resistance/Entity/Damage/Crush", "add": 1 }
 	],
 	"auraName": "Founder and Defender of the Republic",
-	"auraDescription": "Brutus was one of the key figures in the overthrow of the monarchy and the founding of the Roman Republic. Later, as consul he led a Roman army to victory against the Etruscan King Tarquinius who sought to retake the throne.\nHumans and Siege Engines +1 crush, hack, pierce resistance."
+	"auraDescription": "Brutus was one of the key figures in the overthrow of the monarchy and the founding of the Roman Republic. Later, as consul, he led a Roman army to victory against the Etruscan King Tarquinius who sought to retake the throne.\nHumans and Siege Engines +1 crush, hack, and pierce resistance."
 }

binaries/data/mods/public/simulation/helpers/Commands.js

@@ -179,6 +179,28 @@ var g_Commands = {
 		});
 	},
 
+	"attack-group": function(player, cmd, data)
+	{
+		const unitAIs = data.entities.flatMap(ent =>
+		{
+			const cmpUnitAI = Engine.QueryInterface(ent, IID_UnitAI);
+			const cmpAttack = Engine.QueryInterface(ent, IID_Attack);
+
+			// Check if unit can move and has attack capability
+			const canAttack = cmpAttack && cmpAttack.GetAttackTypes().length > 0;
+			return (cmpUnitAI && cmpUnitAI.AbleToMove() && canAttack) ? [cmpUnitAI] : [];
+		});
+
+		if (!unitAIs.length || !cmd.targets?.length)
+			return;
+
+		// Pass the entire target array and unit count to each UnitAI
+		unitAIs.forEach((cmpUnitAI, index) =>
+		{
+			cmpUnitAI.AttackGroup(cmd.targets, index, unitAIs.length, cmd.allowCapture, cmd.queued, cmd.pushFront);
+		});
+	},
+
 	"patrol": function(player, cmd, data)
 	{
 		const ents = data.entities.length;

build/jenkins/pipelines/nightly-build.Jenkinsfile

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Wildfire Games.
+/* Copyright (C) 2026 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -54,7 +54,7 @@ pipeline {
         stage('Check for shader changes') {
             when {
                 anyOf {
-                    changeset 'binaries/data/mods/**/shaders/**/*.xml'
+                    changeset 'binaries/data/mods/**/shaders/**/*'
                     changeset 'source/tools/spirv/compile.py'
                 }
             }

build/premake/extern_libs5.lua

@@ -572,6 +572,16 @@ extern_lib_defs = {
 			end
 		end,
 	},
+	ngtcp2 = {
+		compile_settings = function()
+			pkgconfig.add_includes("libngtcp2")
+			pkgconfig.add_includes("libngtcp2_crypto_gnutls")
+		end,
+		link_settings = function()
+			pkgconfig.add_links("libngtcp2")
+			pkgconfig.add_links("libngtcp2_crypto_gnutls")
+		end
+	},
 	nvtt = {
 		compile_settings = function()
 			if not _OPTIONS["with-system-nvtt"] then

build/premake/premake5.lua

@@ -731,6 +731,7 @@ function setup_all_libs ()
 		"cpp_httplib",
 		"spidermonkey",
 		"enet",
+		"ngtcp2",
 		"sdl",
 		"boost",	-- dragged in via server->simulation.h->random and NetSession.h->lockfree
 		"fmt",
@@ -802,6 +803,7 @@ function setup_all_libs ()
 			"spidermonkey",
 			"boost",
 			"enet",
+			"ngtcp2",
 			"gloox",
 			"icu",
 			"iconv",
@@ -883,6 +885,7 @@ function setup_all_libs ()
 		"zlib",
 		"boost",
 		"enet",
+		"ngtcp2",
 		"libcurl",
 		"tinygettext",
 		"icu",
@@ -970,6 +973,7 @@ function setup_all_libs ()
 		"sdl",	-- key definitions
 		"boost",
 		"enet",
+		"ngtcp2",
 		"tinygettext",
 		"icu",
 		"iconv",
@@ -1105,6 +1109,7 @@ used_extern_libs = {
 	"cxxtest",
 	"comsuppw",
 	"enet",
+	"ngtcp2",
 	"libcurl",
 	"tinygettext",
 	"icu",

libraries/build-macos-libs.sh

@@ -28,7 +28,7 @@ SDL2_VERSION="SDL2-2.24.0"
 # NOTE: remember to also update LIB_URL below when changing version
 BOOST_VERSION="boost_1_81_0"
 # NOTE: remember to also update LIB_URL below when changing version
-WXWIDGETS_VERSION="wxWidgets-3.2.8"
+WXWIDGETS_VERSION="wxWidgets-3.2.10"
 # libpng was included as part of X11 but that's removed from Mountain Lion
 # (also the Snow Leopard version was ancient 1.2)
 PNG_VERSION="libpng-1.6.44"
@@ -477,7 +477,7 @@ echo "Building wxWidgets..."
 	LIB_VERSION="${WXWIDGETS_VERSION}"
 	LIB_ARCHIVE="$LIB_VERSION.tar.bz2"
 	LIB_DIRECTORY="$LIB_VERSION"
-	LIB_URL="http://github.com/wxWidgets/wxWidgets/releases/download/v3.2.8/"
+	LIB_URL="http://github.com/wxWidgets/wxWidgets/releases/download/v3.2.10/"
 
 	mkdir -p wxwidgets
 	cd wxwidgets

libraries/source/cpp-httplib/build.sh

@@ -33,6 +33,8 @@ echo "Building cpp-httplib..."
 if [ -e .already-built ] && [ "$(cat .already-built || true)" = "${LIB_VERSION}" ]; then
 	echo "Skipping - already built (use --force-rebuild to override)"
 	exit
+else
+	rm -f .already-built
 fi
 
 # fetch

libraries/source/cxxtest-4.4/build.sh

@@ -33,6 +33,8 @@ done
 if [ -e .already-built ] && [ "$(cat .already-built || true)" = "${LIB_VERSION}" ]; then
 	echo "Skipping - already built (use --force-rebuild to override)"
 	exit
+else
+	rm -f .already-built
 fi
 
 # fetch

libraries/source/fcollada/build.sh

@@ -49,6 +49,8 @@ done
 if [ -e .already-built ] && [ "$(cat .already-built || true)" = "${LIB_VERSION}" ]; then
 	echo "Skipping - already built (use --force-rebuild to override)"
 	exit
+else
+	rm -f .already-built
 fi
 
 # fetch

libraries/source/nvtt/build.sh

@@ -49,6 +49,8 @@ done
 if [ -e .already-built ] && [ "$(cat .already-built || true)" = "${LIB_VERSION}" ]; then
 	echo "Skipping - already built (use --force-rebuild to override)"
 	exit
+else
+	rm -f .already-built
 fi
 
 # fetch

libraries/source/premake-core/build.sh

@@ -36,6 +36,8 @@ done
 if [ -e .already-built ] && [ "$(cat .already-built || true)" = "${LIB_VERSION}" ]; then
 	echo "Skipping - already built (use --force-rebuild to override)"
 	exit
+else
+	rm -f .already-built
 fi
 
 # fetch

libraries/source/spidermonkey/build.sh

@@ -56,6 +56,8 @@ echo "Building SpiderMonkey..."
 if [ -e .already-built ] && [ "$(cat .already-built || true)" = "${LIB_VERSION}" ]; then
 	echo "Skipping - already built (use --force-rebuild to override)"
 	exit
+else
+	rm -f .already-built
 fi
 
 OS="${OS:=$(uname -s)}"

libraries/source/spirv-reflect/build.sh

@@ -33,6 +33,8 @@ done
 if [ -e .already-built ] && [ "$(cat .already-built || true)" = "${LIB_VERSION}" ]; then
 	echo "Skipping - already built (use --force-rebuild to override)"
 	exit
+else
+	rm -f .already-built
 fi
 
 # fetch

ruff.toml

@@ -33,6 +33,7 @@ ignore = [
     "ANN",
     "C90",
     "COM812",
+    "CPY001",
     "D10",
     "EM",
     "FIX002",

source/graphics/CinemaManager.cpp

@@ -92,12 +92,12 @@ void CCinemaManager::DrawSpline(Renderer::Backend::IDeviceCommandContext& device
 	if (spline.GetAllNodes().size() == 2)
 		smoothness = 2;
 
-	const float start = spline.MaxDistance.ToFloat() / smoothness;
+	const float start = spline.GetMaxDistance().ToFloat() / smoothness;
 
 	std::vector<CVector3D> line;
 	for (int i = 0; i <= smoothness; ++i)
 	{
-		const float time = start * i / spline.MaxDistance.ToFloat();
+		const float time = start * i / spline.GetMaxDistance().ToFloat();
 		line.emplace_back(spline.GetPosition(time));
 	}
 
@@ -108,7 +108,7 @@ void CCinemaManager::DrawSpline(Renderer::Backend::IDeviceCommandContext& device
 	{
 		for (int i = 0; i <= smoothness; ++i)
 		{
-			const float time = start * i / spline.MaxDistance.ToFloat();
+			const float time = start * i / spline.GetMaxDistance().ToFloat();
 			const CVector3D tmp = spline.GetPosition(time);
 			const float groundY = g_Game->GetWorld()->GetTerrain().GetExactGroundLevel(tmp.X, tmp.Z);
 			g_Renderer.GetDebugRenderer().DrawLine(deviceCommandContext, tmp, CVector3D(tmp.X, groundY, tmp.Z), splineColor, 0.1f, false);

source/graphics/LightEnv.h

@@ -53,25 +53,6 @@ public:
 	void SetElevation(float f);
 	void SetRotation(float f);
 
-	/**
-	 * Calculate brightness of a point of a unit with the given normal vector,
-	 * for rendering with CPU lighting.
-	 * The resulting color contains both ambient and diffuse light.
-	 * To cope with sun overbrightness, the color is scaled by 0.5.
-	 *
-	 * @param normal normal vector (must have length 1)
-	 */
-	RGBColor EvaluateUnitScaled(const CVector3D& normal) const
-	{
-		float dot = -normal.Dot(m_SunDir);
-
-		RGBColor color = m_AmbientColor;
-		if (dot > 0)
-			color += m_SunColor * dot;
-
-		return color * 0.5f;
-	}
-
 	// Comparison operators
 	bool operator==(const CLightEnv& o) const
 	{

source/graphics/Material.cpp

@@ -62,8 +62,7 @@ void CMaterial::AddRenderQuery(const char* key)
 	m_RenderQueries.Add(key);
 }
 
-void CMaterial::AddRequiredSampler(const CStr& samplerName)
+void CMaterial::AddRequiredSampler(RequiredSampler sampler)
 {
-	CStrIntern string(samplerName);
+	m_RequiredSamplers.emplace_back(std::move(sampler));
-	m_RequiredSamplers.push_back(string);
 }

source/graphics/Material.h

@@ -53,6 +53,12 @@ public:
 		CTexturePtr Sampler;
 	};
 
+	struct RequiredSampler
+	{
+		CStrIntern name;
+		bool sRGB;
+	};
+
 	typedef std::vector<TextureSampler> SamplersVector;
 
 	CMaterial();
@@ -82,8 +88,8 @@ public:
 	void AddRenderQuery(const char* key);
 	const CShaderRenderQueries& GetRenderQueries() const { return m_RenderQueries; }
 
-	void AddRequiredSampler(const CStr& samplerName);
+	void AddRequiredSampler(RequiredSampler sampler);
-	const std::vector<CStrIntern>& GetRequiredSampler() const { return m_RequiredSamplers; }
+	const std::vector<RequiredSampler>& GetRequiredSamplers() const { return m_RequiredSamplers; }
 
 private:
 
@@ -92,7 +98,7 @@ private:
 	CTexturePtr m_DiffuseTexture;
 
 	SamplersVector m_Samplers;
-	std::vector<CStrIntern> m_RequiredSamplers;
+	std::vector<RequiredSampler> m_RequiredSamplers;
 
 	std::array<CStrIntern, static_cast<size_t>(Pass::COUNT)> m_ShaderEffects;
 	CShaderDefines m_ShaderDefines;

source/graphics/MaterialManager.cpp

@@ -103,6 +103,7 @@ CMaterial CMaterialManager::LoadMaterial(const VfsPath& pathname)
 	AT(material);
 	AT(name);
 	AT(pass);
+	AT(srgb);
 	AT(value);
 	#undef AT
 	#undef EL
@@ -161,7 +162,8 @@ CMaterial CMaterialManager::LoadMaterial(const VfsPath& pathname)
 		}
 		else if (token == el_required_texture)
 		{
-			material.AddRequiredSampler(attrs.GetNamedItem(at_name));
+			const bool sRGB{attrs.GetNamedItem(at_srgb) == "true"};
+			material.AddRequiredSampler({CStrIntern{attrs.GetNamedItem(at_name)}, sRGB});
 			if (!attrs.GetNamedItem(at_define).empty())
 				material.AddShaderDefine(CStrIntern(attrs.GetNamedItem(at_define)), str_1);
 		}

source/graphics/ObjectBase.cpp

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Wildfire Games.
+/* Copyright (C) 2026 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -69,7 +69,7 @@ CObjectBase::CObjectBase(CObjectManager& objectManager, CActorDef& actorDef, u8
 	m_Properties.m_FloatOnWater = false;
 
 	// Remove leading art/actors/ & include quality level.
-	m_Identifier = m_ActorDef.m_Pathname.string8().substr(11) + CStr::FromInt(m_QualityLevel);
+	m_Identifier = fmt::format("{}{}", m_ActorDef.m_Pathname.string8().substr(11), m_QualityLevel);
 }
 
 std::unique_ptr<CObjectBase> CObjectBase::CopyWithQuality(u8 newQualityLevel) const

source/graphics/ObjectEntry.cpp

@@ -51,6 +51,22 @@
 #include <sstream>
 #include <utility>
 
+namespace
+{
+
+bool ShouldInterpretTextureAsSRGB(const CObjectBase::Samp& sampler, const CMaterial& material)
+{
+	const auto requiredSamplers{material.GetRequiredSamplers()};
+	auto it{std::find_if(requiredSamplers.begin(), requiredSamplers.end(),
+		[&](const CMaterial::RequiredSampler& requiredSampler)
+		{
+			return requiredSampler.name == sampler.m_SamplerName;
+		})};
+	return it != requiredSamplers.end() && it->sRGB;
+}
+
+}
+
 CObjectEntry::CObjectEntry(const std::shared_ptr<CObjectBase>& base, const CSimulation2& simulation) :
 	m_Base(base), m_Color(1.0f, 1.0f, 1.0f, 1.0f), m_Simulation(simulation)
 {
@@ -155,6 +171,7 @@ bool CObjectEntry::BuildVariation(const std::vector<const std::set<CStr>*>& comp
 	{
 		CTextureProperties textureProps(samp.m_SamplerFile);
 		textureProps.SetAddressMode(Renderer::Backend::Sampler::AddressMode::CLAMP_TO_EDGE);
+		textureProps.SetSRGB(ShouldInterpretTextureAsSRGB(samp, material));
 		CTexturePtr texture = g_Renderer.GetTextureManager().CreateTexture(textureProps);
 		// if we've loaded this model we're probably going to render it soon, so prefetch its texture.
 		// All textures are prefetched even in the fixed pipeline, including the normal maps etc.
@@ -167,11 +184,14 @@ bool CObjectEntry::BuildVariation(const std::vector<const std::set<CStr>*>& comp
 	CModel* model = newModel.get();
 	m_Model = std::move(newModel);
 
-	for (const CStrIntern& requSampName : model->GetMaterial().GetRequiredSampler())
+	for (const auto& requiredSampler : model->GetMaterial().GetRequiredSamplers())
 	{
 		if (std::find_if(m_Samplers.begin(), m_Samplers.end(),
-		                 [&](const CObjectBase::Samp& sampler) { return sampler.m_SamplerName == requSampName; }) == m_Samplers.end())
+		                 [&](const CObjectBase::Samp& sampler) { return sampler.m_SamplerName == requiredSampler.name; }) == m_Samplers.end())
-			LOGERROR("Actor %s: required texture sampler %s not found (material %s)", m_Base->GetIdentifier(), requSampName.string().c_str(), m_Base->m_Material.string8().c_str());
+		{
+			LOGERROR("Actor %s: required texture sampler %s not found (material %s)",
+				m_Base->GetIdentifier(), requiredSampler.name.string().c_str(), m_Base->m_Material.string8().c_str());
+		}
 	}
 
 	// calculate initial object space bounds, based on vertex positions

source/graphics/PreprocessorWrapper.cpp

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Wildfire Games.
+/* Copyright (C) 2026 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -156,7 +156,8 @@ bool ResolveIncludesImpl(
 			it = includeCache.emplace(path, std::move(includeContent)).first;
 		}
 		// We need to insert #line directives to have correct line numbers in errors.
-		chunks.emplace_back(lineDirective + "1\n" + it->second + "\n" + lineDirective + CStr::FromUInt(line + 1) + "\n");
+		chunks.emplace_back(fmt::format("{}1\n{}\n{}{}\n", lineDirective, it->second, lineDirective,
+			line + 1));
 		processedParts.emplace_back(currentPart.substr(0, lineStart));
 		if (!ResolveIncludesImpl(chunks.back(), includeCache, includeCallback, chunks, processedParts))
 			return false;

source/graphics/TextureManager.cpp

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Wildfire Games.
+/* Copyright (C) 2026 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -60,7 +60,7 @@ namespace
 {
 
 Renderer::Backend::Format ChooseFormatAndTransformTextureDataIfNeeded(
-	Renderer::Backend::IDevice* device, Tex& textureData, const bool hasS3TC)
+	Renderer::Backend::IDevice* device, Tex& textureData, const bool hasS3TC, const bool sRGB)
 {
 	const bool alpha = (textureData.m_Flags & TEX_ALPHA) != 0;
 	const bool grey = (textureData.m_Flags & TEX_GREY) != 0;
@@ -81,13 +81,13 @@ Renderer::Backend::Format ChooseFormatAndTransformTextureDataIfNeeded(
 			switch (dxt)
 			{
 			case DXT1A:
-				return Renderer::Backend::Format::BC1_RGBA_UNORM;
+				return sRGB ? Renderer::Backend::Format::BC1_RGBA_SRGB : Renderer::Backend::Format::BC1_RGBA_UNORM;
 			case 1:
-				return Renderer::Backend::Format::BC1_RGB_UNORM;
+				return sRGB ? Renderer::Backend::Format::BC1_RGB_SRGB : Renderer::Backend::Format::BC1_RGB_UNORM;
 			case 3:
-				return Renderer::Backend::Format::BC2_UNORM;
+				return sRGB ? Renderer::Backend::Format::BC2_SRGB : Renderer::Backend::Format::BC2_UNORM;
 			case 5:
-				return Renderer::Backend::Format::BC3_UNORM;
+				return sRGB ? Renderer::Backend::Format::BC3_SRGB : Renderer::Backend::Format::BC3_UNORM;
 			default:
 				LOGERROR("Unknown DXT compression.");
 				return Renderer::Backend::Format::UNDEFINED;
@@ -101,9 +101,12 @@ Renderer::Backend::Format ChooseFormatAndTransformTextureDataIfNeeded(
 	{
 	case 8:
 		ENSURE(grey);
+		ENSURE(!sRGB);
 		return Renderer::Backend::Format::L8_UNORM;
 	case 24:
+		ENSURE(grey);
 		ENSURE(!alpha);
+		ENSURE(!sRGB);
 		if (device->IsTextureFormatSupported(Renderer::Backend::Format::R8G8B8_UNORM))
 			return Renderer::Backend::Format::R8G8B8_UNORM;
 		else
@@ -114,7 +117,7 @@ Renderer::Backend::Format ChooseFormatAndTransformTextureDataIfNeeded(
 		}
 	case 32:
 		ENSURE(alpha);
-		return Renderer::Backend::Format::R8G8B8A8_UNORM;
+		return sRGB ? Renderer::Backend::Format::R8G8B8A8_SRGB : Renderer::Backend::Format::R8G8B8A8_UNORM;
 	default:
 		LOGERROR("Unsupported BPP: %zu", textureData.m_Bpp);
 	}
@@ -336,6 +339,7 @@ struct TPhash
 		hash_combine(seed, textureProperties.m_AnisotropicFilterEnabled);
 		hash_combine(seed, textureProperties.m_FormatOverride);
 		hash_combine(seed, textureProperties.m_IgnoreQuality);
+		hash_combine(seed, textureProperties.m_SRGB);
 		return seed;
 	}
 
@@ -358,7 +362,8 @@ struct TPequal_to
 			lhs.m_AddressModeV == rhs.m_AddressModeV &&
 			lhs.m_AnisotropicFilterEnabled == rhs.m_AnisotropicFilterEnabled &&
 			lhs.m_FormatOverride == rhs.m_FormatOverride &&
-			lhs.m_IgnoreQuality == rhs.m_IgnoreQuality;
+			lhs.m_IgnoreQuality == rhs.m_IgnoreQuality &&
+			lhs.m_SRGB == rhs.m_SRGB;
 	}
 
 	bool operator()(const CTexturePtr& lhs, const CTexturePtr& rhs) const
@@ -526,7 +531,8 @@ public:
 		}
 		else
 		{
-			format = ChooseFormatAndTransformTextureDataIfNeeded(m_Device, textureData, m_HasS3TC);
+			format = ChooseFormatAndTransformTextureDataIfNeeded(
+				m_Device, textureData, m_HasS3TC, texture->m_Properties.m_SRGB);
 		}
 
 		if (format == Renderer::Backend::Format::UNDEFINED)

source/graphics/TextureManager.h

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Wildfire Games.
+/* Copyright (C) 2026 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -245,6 +245,8 @@ public:
 
 	void SetIgnoreQuality(bool ignore) { m_IgnoreQuality = ignore; }
 
+	void SetSRGB(const bool sRGB) { m_SRGB = sRGB; }
+
 private:
 	// Must update TPhash, TPequal_to when changing these fields
 	VfsPath m_Path;
@@ -257,6 +259,7 @@ private:
 	Renderer::Backend::Format m_FormatOverride =
 		Renderer::Backend::Format::UNDEFINED;
 	bool m_IgnoreQuality = false;
+	bool m_SRGB{false};
 };
 
 /**

source/gui/CGUI.cpp

@@ -755,7 +755,7 @@ void CGUI::Xeromyces_ReadObject(const XMBData& xmb, XMBElement element, IGUIObje
 	// Check if name isn't set, generate an internal name in that case.
 	if (!NameSet)
 	{
-		object->SetName("__internal(" + CStr::FromInt(m_InternalNameNumber) + ")");
+		object->SetName(fmt::format("__internal({})", m_InternalNameNumber));
 		++m_InternalNameNumber;
 	}
 
@@ -977,7 +977,7 @@ void CGUI::Xeromyces_ReadRepeat(const XMBData& xmb, XMBElement element, IGUIObje
 
 	for (int n = 0; n < count; ++n)
 	{
-		NameSubst.emplace_back(var, "[" + CStr::FromInt(n) + "]");
+		NameSubst.emplace_back(var, fmt::format("[{}]", n));
 
 		XERO_ITER_EL(element, child)
 		{

source/maths/NUSpline.cpp

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Wildfire Games.
+/* Copyright (C) 2026 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -52,114 +52,111 @@ CVector3D GetPositionOnCubic(const CVector3D& startPos, const CVector3D& startVe
 
 /*********************************** R N S **************************************************/
 
-RNSpline::RNSpline()
+RNSpline::RNSpline() = default;
-	: NodeCount(0)
-{
-}
 
 RNSpline::~RNSpline() = default;
 
 // adds node and updates segment length
 void RNSpline::AddNode(const CFixedVector3D& pos)
 {
-	if (NodeCount >= MAX_SPLINE_NODES)
+	if (m_NodeCount >= MAX_SPLINE_NODES)
 		return;
-	if (NodeCount == 0)
+	if (m_NodeCount == 0)
-		MaxDistance = fixed::Zero();
+		m_MaxDistance = fixed::Zero();
 	else
 	{
-		Node[NodeCount-1].Distance = (Node[NodeCount-1].Position - pos).Length();
+		m_Nodes[m_NodeCount-1].Distance = (m_Nodes[m_NodeCount-1].Position - pos).Length();
-		MaxDistance += Node[NodeCount-1].Distance;
+		m_MaxDistance += m_Nodes[m_NodeCount-1].Distance;
 	}
 	SplineData temp;
 	temp.Position = pos;
-	Node.push_back(temp);
+	m_Nodes.push_back(temp);
-	++NodeCount;
+	++m_NodeCount;
 }
 
 
 // called after all nodes added. This function calculates the node velocities
 void RNSpline::BuildSpline()
 {
-	if (NodeCount == 2)
+	if (m_NodeCount == 2)
 	{
-		Node[0].Velocity = GetStartVelocity(0);
+		m_Nodes[0].Velocity = GetStartVelocity(0);
-		Node[NodeCount-1].Velocity = GetEndVelocity(NodeCount-1);
+		m_Nodes[m_NodeCount-1].Velocity = GetEndVelocity(m_NodeCount-1);
 		return;
 	}
-	else if (NodeCount < 2)
+	else if (m_NodeCount < 2)
 		return;
 
-	for (int i = 1; i < NodeCount-1; ++i)
+	for (int i = 1; i < m_NodeCount-1; ++i)
 	{
-		CVector3D Next = Node[i+1].Position - Node[i].Position;
+		CVector3D Next = m_Nodes[i+1].Position - m_Nodes[i].Position;
-		CVector3D Previous = Node[i-1].Position - Node[i].Position;
+		CVector3D Previous = m_Nodes[i-1].Position - m_Nodes[i].Position;
 		Next.Normalize();
 		Previous.Normalize();
 
 		// split the angle (figure 4)
-		Node[i].Velocity = Next - Previous;
+		m_Nodes[i].Velocity = Next - Previous;
-		Node[i].Velocity.Normalize();
+		m_Nodes[i].Velocity.Normalize();
 	}
 	// calculate start and end velocities
-	Node[0].Velocity = GetStartVelocity(0);
+	m_Nodes[0].Velocity = GetStartVelocity(0);
-	Node[NodeCount-1].Velocity = GetEndVelocity(NodeCount-1);
+	m_Nodes[m_NodeCount-1].Velocity = GetEndVelocity(m_NodeCount-1);
 }
 
 // spline access function. time is 0 -> 1
 CVector3D RNSpline::GetPosition(float time) const
 {
-	if (NodeCount < 2)
+	if (m_NodeCount < 2)
 		return CVector3D(0.0f, 0.0f, 0.0f);
 	if (time < 0.0f)
 		time = 0.0f;
 	if (time > 1.0f)
 		time = 1.0f;
-	float Distance = time * MaxDistance.ToFloat();
+	float Distance = time * m_MaxDistance.ToFloat();
 	float CurrentDistance = 0.f;
 	int i = 0;
 
 	// Find which node we're on
-	while (CurrentDistance + Node[i].Distance.ToFloat() < Distance && i < NodeCount - 2)
+	while (CurrentDistance + m_Nodes[i].Distance.ToFloat() < Distance && i < m_NodeCount - 2)
 	{
-		CurrentDistance += Node[i].Distance.ToFloat();
+		CurrentDistance += m_Nodes[i].Distance.ToFloat();
 		++i;
 	}
-	ENSURE(i < NodeCount - 1);
+	ENSURE(i < m_NodeCount - 1);
 	float t = Distance - CurrentDistance;
 	// TODO: reimplement CVector3D comparator (float comparing is bad without EPS)
-	if (Node[i].Position == Node[i+1].Position || Node[i].Distance.ToFloat() < 1e-7) // distance too small or zero
+	if (m_Nodes[i].Position == m_Nodes[i+1].Position || m_Nodes[i].Distance.ToFloat() < 1e-7) // distance too small or zero
 	{
-		return Node[i+1].Position;
+		return m_Nodes[i+1].Position;
 	}
-	t /= Node[i].Distance.ToFloat(); // scale t in range 0 - 1
+	t /= m_Nodes[i].Distance.ToFloat(); // scale t in range 0 - 1
-	CVector3D startVel = Node[i].Velocity * Node[i].Distance.ToFloat();
+	CVector3D startVel = m_Nodes[i].Velocity * m_Nodes[i].Distance.ToFloat();
-	CVector3D endVel = Node[i+1].Velocity * Node[i].Distance.ToFloat();
+	CVector3D endVel = m_Nodes[i+1].Velocity * m_Nodes[i].Distance.ToFloat();
-	return GetPositionOnCubic(Node[i].Position, startVel,
+	return GetPositionOnCubic(m_Nodes[i].Position, startVel,
-		Node[i+1].Position, endVel, t);
+		m_Nodes[i+1].Position, endVel, t);
 }
 
 const std::vector<SplineData>& RNSpline::GetAllNodes() const
 {
-	return Node;
+	return m_Nodes;
 }
 
 // internal. Based on Equation 14
 CVector3D RNSpline::GetStartVelocity(int index)
 {
-	if (index >= NodeCount - 1 || index < 0)
+	if (index >= m_NodeCount - 1 || index < 0)
 		return CVector3D(0.0f, 0.0f, 0.0f);
-	CVector3D temp = CVector3D(Node[index+1].Position - Node[index].Position) * 3.0f * (1.0f / Node[index].Distance.ToFloat());
+	CVector3D temp = CVector3D(m_Nodes[index+1].Position - m_Nodes[index].Position) * 3.0f * (1.0f / m_Nodes[index].Distance.ToFloat());
-	return (temp - Node[index+1].Velocity)*0.5f;
+	return (temp - m_Nodes[index+1].Velocity)*0.5f;
 }
 
 // internal. Based on Equation 15
 CVector3D RNSpline::GetEndVelocity(int index)
 {
-	if (index >= NodeCount || index < 1)
+	if (index >= m_NodeCount || index < 1)
 		return CVector3D(0.0f, 0.0f, 0.0f);
-	CVector3D temp = CVector3D(Node[index].Position - Node[index-1].Position) * 3.0f * (1.0f / Node[index-1].Distance.ToFloat());
+	CVector3D temp = CVector3D(m_Nodes[index].Position - m_Nodes[index-1].Position) * 3.0f * (1.0f / m_Nodes[index-1].Distance.ToFloat());
-	return (temp - Node[index-1].Velocity) * 0.5f;
+	return (temp - m_Nodes[index-1].Velocity) * 0.5f;
 }
 
 /*********************************** S N S **************************************************/
@@ -176,21 +173,21 @@ void SNSpline::BuildSpline()
 // smoothing filter.
 void SNSpline::Smooth()
 {
-	if (NodeCount < 3)
+	if (m_NodeCount < 3)
 		return;
 
 	CVector3D newVel;
 	CVector3D oldVel = GetStartVelocity(0);
-	for (int i = 1; i < NodeCount-1; ++i)
+	for (int i = 1; i < m_NodeCount-1; ++i)
 	{
 		// Equation 12
-		newVel = GetEndVelocity(i) * Node[i].Distance.ToFloat() + GetStartVelocity(i) * Node[i-1].Distance.ToFloat();
+		newVel = GetEndVelocity(i) * m_Nodes[i].Distance.ToFloat() + GetStartVelocity(i) * m_Nodes[i-1].Distance.ToFloat();
-		newVel = newVel * (1 / (Node[i-1].Distance + Node[i].Distance).ToFloat());
+		newVel = newVel * (1 / (m_Nodes[i-1].Distance + m_Nodes[i].Distance).ToFloat());
-		Node[i-1].Velocity = oldVel;
+		m_Nodes[i-1].Velocity = oldVel;
 		oldVel = newVel;
 	}
-	Node[NodeCount-1].Velocity = GetEndVelocity(NodeCount-1);
+	m_Nodes[m_NodeCount-1].Velocity = GetEndVelocity(m_NodeCount-1);
-	Node[NodeCount-2].Velocity = oldVel;
+	m_Nodes[m_NodeCount-2].Velocity = oldVel;
 }
 
 /*********************************** T N S **************************************************/
@@ -201,15 +198,15 @@ TNSpline::~TNSpline() = default;
 // ie time period is time from last node to this node
 void TNSpline::AddNode(const CFixedVector3D& pos, const CFixedVector3D& rotation, fixed timePeriod)
 {
-	if (NodeCount >= MAX_SPLINE_NODES)
+	if (m_NodeCount >= MAX_SPLINE_NODES)
 		return;
 
-	if (NodeCount == 0)
+	if (m_NodeCount == 0)
-		MaxDistance = fixed::Zero();
+		m_MaxDistance = fixed::Zero();
 	else
 	{
-		Node[NodeCount-1].Distance = timePeriod;
+		m_Nodes[m_NodeCount-1].Distance = timePeriod;
-		MaxDistance += Node[NodeCount-1].Distance;
+		m_MaxDistance += m_Nodes[m_NodeCount-1].Distance;
 	}
 
 	SplineData temp;
@@ -219,56 +216,56 @@ void TNSpline::AddNode(const CFixedVector3D& pos, const CFixedVector3D& rotation
 	temp.Distance = fixed::Zero();
 	temp.Velocity = CVector3D(0.0f, 0.0f, 0.0f);
 	temp.Rotation = rotation;
-	Node.push_back(temp);
+	m_Nodes.push_back(temp);
-	++NodeCount;
+	++m_NodeCount;
 }
 
 //Inserts node before position
 void TNSpline::InsertNode(const int index, const CFixedVector3D& pos, const CFixedVector3D& /*rotation*/,
 	fixed timePeriod)
 {
-	if (NodeCount >= MAX_SPLINE_NODES || index < 0 || index > NodeCount)
+	if (m_NodeCount >= MAX_SPLINE_NODES || index < 0 || index > m_NodeCount)
 		return;
 
-	if (NodeCount == 0)
+	if (m_NodeCount == 0)
-		MaxDistance = fixed::Zero();
+		m_MaxDistance = fixed::Zero();
 	else
-		MaxDistance += timePeriod;
+		m_MaxDistance += timePeriod;
 
 	SplineData temp;
 	temp.Position = pos;
 	temp.Distance = timePeriod;
-	Node.insert(Node.begin() + index, temp);
+	m_Nodes.insert(m_Nodes.begin() + index, temp);
 	if (index > 0)
-		std::swap(Node[index].Distance, Node[index - 1].Distance);
+		std::swap(m_Nodes[index].Distance, m_Nodes[index - 1].Distance);
-	++NodeCount;
+	++m_NodeCount;
 }
 
 //Removes node at index
 void TNSpline::RemoveNode(const int index)
 {
-	if (NodeCount == 0 || index > NodeCount - 1)
+	if (m_NodeCount == 0 || index > m_NodeCount - 1)
 		return;
 
-	MaxDistance -= Node[index].Distance;
+	m_MaxDistance -= m_Nodes[index].Distance;
-	Node.erase(Node.begin() + index);
+	m_Nodes.erase(m_Nodes.begin() + index);
-	--NodeCount;
+	--m_NodeCount;
 }
 
 void TNSpline::UpdateNodeTime(const int index, fixed time)
 {
-	if (NodeCount == 0 || index > NodeCount - 1)
+	if (m_NodeCount == 0 || index > m_NodeCount - 1)
 		return;
 
-	Node[index].Distance = time;
+	m_Nodes[index].Distance = time;
 }
 
 void TNSpline::UpdateNodePos(const int index, const CFixedVector3D& pos)
 {
-	if (NodeCount == 0 || index > NodeCount - 1)
+	if (m_NodeCount == 0 || index > m_NodeCount - 1)
 		return;
 
-	Node[index].Position = pos;
+	m_Nodes[index].Position = pos;
 }
 
 void TNSpline::BuildSpline()
@@ -289,15 +286,15 @@ void TNSpline::Smooth()
 
 void TNSpline::Constrain()
 {
-	if (NodeCount < 3)
+	if (m_NodeCount < 3)
 		return;
 
-	for (int i = 1; i < NodeCount-1; ++i)
+	for (int i = 1; i < m_NodeCount-1; ++i)
 	{
 		// Equation 13
-		float r0 = (Node[i].Position - Node[i - 1].Position).Length().ToFloat() / Node[i-1].Distance.ToFloat();
+		float r0 = (m_Nodes[i].Position - m_Nodes[i - 1].Position).Length().ToFloat() / m_Nodes[i-1].Distance.ToFloat();
-		float r1 = (Node[i+1].Position - Node[i].Position).Length().ToFloat() / Node[i].Distance.ToFloat();
+		float r1 = (m_Nodes[i+1].Position - m_Nodes[i].Position).Length().ToFloat() / m_Nodes[i].Distance.ToFloat();
-		Node[i].Velocity *= 4.0f*r0*r1 / ((r0 + r1)*(r0 + r1));
+		m_Nodes[i].Velocity *= 4.0f*r0*r1 / ((r0 + r1)*(r0 + r1));
 	}
 }
 

source/maths/NUSpline.h

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Wildfire Games.
+/* Copyright (C) 2026 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -63,12 +63,12 @@ public:
 	CVector3D GetRotation(float time) const;
 	const std::vector<SplineData>& GetAllNodes() const;
 
-	fixed MaxDistance;
+	fixed GetMaxDistance() const { return m_MaxDistance; }
-	int NodeCount;
 
 protected:
-
+	fixed m_MaxDistance;
-	std::vector<SplineData> Node;
+	int m_NodeCount{0};
+	std::vector<SplineData> m_Nodes;
 	CVector3D GetStartVelocity(int index);
 	CVector3D GetEndVelocity(int index);
 };

source/network/NetClient.cpp

@@ -72,7 +72,7 @@ CNetClient::CNetClient(CGame* game, std::string serverAddressOrHostname, std::ui
 	CNetClient{PrivateTag{}, game, std::move(serverAddressOrHostname), serverPort, username, hostJID,
 		std::move(hashedPassword), std::move(controllerSecret)}
 {
-	SetupConnection(nullptr);
+	SetupConnection();
 }
 
 CNetClient::CNetClient(PrivateTag, CGame* game, std::string serverAddressOrHostname,
@@ -169,10 +169,10 @@ CNetClient::~CNetClient()
 }
 
 
-void CNetClient::SetupConnection(ENetHost* enetClient)
+void CNetClient::SetupConnection()
 {
 	CNetClientSession* session = new CNetClientSession(*this);
-	bool ok = session->Connect(m_ServerAddressOrHostname, m_ServerPort, enetClient);
+	bool ok = session->Connect(m_ServerAddressOrHostname, m_ServerPort);
 	SetAndOwnSession(session);
 	if (ok)
 		m_PollingThread = std::thread(Threading::HandleExceptions<CNetClientSession::RunNetLoop>::Wrapper, m_Session);
@@ -284,7 +284,7 @@ bool CNetClient::TryToConnectWithSTUN(std::string serverAddressOrHostname, std::
 
 	try
 	{
-		g_NetClient->SetupConnection(enetClient);
+		g_NetClient->SetupConnection();
 	}
 	catch (...)
 	{
@@ -463,6 +463,7 @@ bool CNetClient::SendMessage(const CNetMessage* message)
 
 void CNetClient::HandleConnect()
 {
+	LOGMESSAGE("Net client: Connected", m_ServerAddressOrHostname, m_ServerPort);
 	Update((uint)NMT_CONNECT_COMPLETE, NULL);
 }
 

source/network/NetClient.h

@@ -289,7 +289,7 @@ private:
 	 * Set up a connection to the remote networked server.
 	 * @return true on success, false on connection failure
 	 */
-	void SetupConnection(ENetHost* enetClient);
+	void SetupConnection();
 
 	/**
 	 * Take ownership of a session object, and use it for all network communication.

source/network/NetClientSession.cpp

@@ -22,8 +22,8 @@
 #include "lib/code_generation.h"
 #include "lib/debug.h"
 #include "network/NetClient.h"
-#include "network/NetEnet.h"
 #include "network/NetMessage.h"
+#include "network/NetProtocol.h"
 #include "network/NetStats.h"
 #include "ps/CLogger.h"
 #include "ps/ProfileViewer.h"
@@ -32,43 +32,405 @@
 
 constexpr int NETCLIENT_POLL_TIMEOUT = 50;
 
-constexpr int CHANNEL_COUNT = 1;
+#include <time.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <poll.h>
+
+#include <ngtcp2/ngtcp2.h>
+#include <ngtcp2/ngtcp2_crypto.h>
+#include <ngtcp2/ngtcp2_crypto_gnutls.h>
+
+#include <gnutls/crypto.h>
+#include <gnutls/gnutls.h>
+
+struct CNetClientSession::Quic
+{
+	AddressStorage localAddress;
+	std::unique_ptr<gnutls_certificate_credentials_st, CredentialsDeleter> credentials;
+	std::unique_ptr<gnutls_session_int, SessionDeleter> session;
+	std::unique_ptr<ngtcp2_conn, ConnectionDeleter> quicConnection;
+	ngtcp2_crypto_conn_ref connectionReference;
+	int fd;
+
+	std::optional<Stream> streams;
+};
+
+namespace
+{
+
+struct CreateSocketResult
+{
+	int descriptor;
+	AddressStorage address;
+};
+CreateSocketResult CreateSocket(const char* host, const std::uint16_t port)
+{
+	addrinfo hints{};
+	hints.ai_flags = AF_UNSPEC;
+	hints.ai_socktype = SOCK_DGRAM;
+
+	addrinfo* res;
+	const int rv{getaddrinfo(host, fmt::format("{}", port).c_str(), &hints, &res)};
+	if (rv)
+		throw std::runtime_error{fmt::format("getaddrinfo: {}", gai_strerror(rv))};
+	std::unique_ptr<addrinfo, decltype(&freeaddrinfo)> infoList{res, &freeaddrinfo};
+
+	addrinfo* rp;
+	int fd{-1};
+	for (rp = res; rp; rp = rp->ai_next)
+	{
+		fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+		if (fd != -1)
+			break;
+	}
+
+	if (fd == -1)
+		throw std::runtime_error{"unable to create a socket"};
+
+	CreateSocketResult result{
+		.descriptor{fd},
+		.address{.length{rp->ai_addrlen}}
+	};
+	if (rp->ai_family == AF_INET6)
+		result.address.address.in6 = reinterpret_cast<ngtcp2_sockaddr_in6&>(*rp->ai_addr);
+	else
+		result.address.address.in = reinterpret_cast<ngtcp2_sockaddr_in&>(*rp->ai_addr);
+
+	return result;
+}
+
+AddressStorage ConnectSocket(const int fd, const AddressStorage& remoteAddress)
+{
+	if (connect(fd, &remoteAddress.address.sa, remoteAddress.length))
+		throw std::runtime_error{fmt::format("connect: {}", strerror(errno))};
+
+	ngtcp2_sockaddr_union localAddress;
+	ngtcp2_socklen localAddressLength{sizeof(localAddress)};
+	if (getsockname(fd, &localAddress.sa, &localAddressLength) == -1)
+		throw std::runtime_error{fmt::format("getsockname: {}", strerror(errno))};
+
+	return {localAddress, localAddressLength};
+}
+
+void ClientGnutlsInit(CNetClientSession::Quic* c)
+{
+	gnutls_certificate_credentials_t tempCred;
+	const int allocRet{gnutls_certificate_allocate_credentials(&tempCred)};
+	if (allocRet)
+	{
+		throw std::runtime_error{fmt::format("cred init failed: {}: {}", allocRet,
+			gnutls_strerror(allocRet))};
+	}
+	c->credentials.reset(tempCred);
+
+	gnutls_session_t tempSession;
+	if (const int initRet{gnutls_init(&tempSession, GNUTLS_CLIENT | GNUTLS_ENABLE_EARLY_DATA |
+		GNUTLS_NO_END_OF_EARLY_DATA)})
+	{
+		throw std::runtime_error{fmt::format("gnutls_init: {}", gnutls_strerror(initRet))};
+	}
+	c->session.reset(tempSession);
+
+	if (ngtcp2_crypto_gnutls_configure_client_session(c->session.get()))
+		throw std::runtime_error{"ngtcp2_crypto_gnutls_configure_client_session failed"};
+
+	if (const int priorityRet{gnutls_priority_set_direct(c->session.get(), TLS_PRIORITY, nullptr)})
+	{
+		throw std::runtime_error{fmt::format("gnutls_priority_set_direct: {}",
+			gnutls_strerror(priorityRet))};
+	}
+
+	gnutls_session_set_ptr(c->session.get(), &c->connectionReference);
+
+	if (const int setRet{gnutls_credentials_set(c->session.get(), GNUTLS_CRD_CERTIFICATE,
+		c->credentials.get())})
+	{
+		throw std::runtime_error{fmt::format("gnutls_credentials_set: {}", gnutls_strerror(setRet))};
+	}
+}
+
+int OpenStream(ngtcp2_conn*, const std::int64_t streamId, void* userData)
+{
+	CNetClientSession& session{*static_cast<CNetClientSession*>(userData)};
+
+	session.m_Connected = true;
+	session.m_WasConnected = true;
+	session.m_Quic->streams.emplace(streamId);
+	session.m_IncomingMessages.push(CNetClientSession::ConnectionEstablished{});
+	return 0;
+}
+
+int OnStreamDataReceive(ngtcp2_conn* conn, const std::uint32_t /*flags*/, const std::int64_t streamId,
+	const std::size_t /*offset*/, const std::uint8_t* data, std::size_t dataSize, void* userData, void*)
+{
+	auto& session = *static_cast<CNetClientSession*>(userData);
+	auto message = session.m_Quic->streams.value().Receive({data, dataSize});
+	if (message.has_value())
+		session.m_IncomingMessages.push(new std::vector<std::uint8_t>{std::move(message).value()});
+	increaseWindow(conn, streamId, dataSize);
+	return 0;
+}
+
+void ClientQuicInit(CNetClientSession& session, const AddressStorage& remote, const AddressStorage& local)
+{
+	const ngtcp2_path path{
+		.local{
+			.addr{const_cast<ngtcp2_sockaddr*>(&local.address.sa)},
+			.addrlen{local.length},
+		},
+		.remote{
+			.addr{const_cast<ngtcp2_sockaddr*>(&remote.address.sa)},
+			.addrlen{remote.length},
+		}
+	};
+	constexpr ngtcp2_callbacks callbacks{
+		.client_initial{&ngtcp2_crypto_client_initial_cb},
+		.recv_crypto_data{&ngtcp2_crypto_recv_crypto_data_cb},
+		.encrypt{&ngtcp2_crypto_encrypt_cb},
+		.decrypt{&ngtcp2_crypto_decrypt_cb},
+		.hp_mask{&ngtcp2_crypto_hp_mask_cb},
+		.recv_stream_data{&OnStreamDataReceive},
+		.stream_open{&OpenStream},
+		.recv_retry{&ngtcp2_crypto_recv_retry_cb},
+		.rand{&OnRandomRequest},
+		.get_new_connection_id{&OnNewConnectionIdRequest},
+		.update_key{&ngtcp2_crypto_update_key_cb},
+		.delete_crypto_aead_ctx{&ngtcp2_crypto_delete_crypto_aead_ctx_cb},
+		.delete_crypto_cipher_ctx{&ngtcp2_crypto_delete_crypto_cipher_ctx_cb},
+		.get_path_challenge_data{&ngtcp2_crypto_get_path_challenge_data_cb},
+		.version_negotiation{&ngtcp2_crypto_version_negotiation_cb}
+	};
+	ngtcp2_cid dcid;
+	dcid.datalen = NGTCP2_MIN_INITIAL_DCIDLEN;
+	if (gnutls_rnd(GNUTLS_RND_RANDOM, dcid.data, dcid.datalen))
+		throw std::runtime_error{"gnutls_rnd failed"};
+
+	ngtcp2_cid scid;
+	scid.datalen = 8;
+	if (gnutls_rnd(GNUTLS_RND_RANDOM, scid.data, scid.datalen))
+		throw std::runtime_error{"gnutls_rnd failed"};
+
+	ngtcp2_settings settings;
+	ngtcp2_settings_default(&settings);
+	settings.initial_ts = timestamp();
+
+	ngtcp2_transport_params params;
+	ngtcp2_transport_params_default(&params);
+	params.initial_max_stream_data_bidi_remote = 128 * KiB;
+	params.initial_max_data = 1 * MiB;
+	params.initial_max_streams_bidi = 1;
+	params.max_udp_payload_size = MAX_UDP_PAYLOAD_SIZE;
+	params.grease_quic_bit = 1;
+
+	ngtcp2_conn* tempConn;
+	if (const int rv{ngtcp2_conn_client_new(&tempConn, &dcid, &scid, &path,
+		NGTCP2_PROTO_VER_V1, &callbacks, &settings, &params, nullptr, &session)})
+	{
+		throw std::runtime_error{fmt::format("ngtcp2_conn_client_new: {}", ngtcp2_strerror(rv))};
+	}
+	session.m_Quic->quicConnection.reset(tempConn);
+
+	ngtcp2_conn_set_tls_native_handle(session.m_Quic->quicConnection.get(),
+		session.m_Quic->session.get());
+}
+
+void ClientRead(CNetClientSession::Quic* c) {
+	std::array<std::uint8_t, MAX_UDP_PAYLOAD_SIZE> buf;
+	struct sockaddr_storage addr;
+	iovec iov{
+		.iov_base = buf.data(),
+		.iov_len = buf.size(),
+	};
+	msghdr msg{};
+	msg.msg_name = &addr;
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+
+	ngtcp2_pkt_info pi{};
+	while (true)
+	{
+		msg.msg_namelen = sizeof(addr);
+
+		const ssize_t nread{recvmsg(c->fd, &msg, MSG_DONTWAIT)};
+
+		if (nread == -1)
+		{
+			if (errno != EAGAIN && errno != EWOULDBLOCK)
+				LOGERROR("recvmsg: %s", strerror(errno));
+
+			break;
+		}
+
+		ngtcp2_path path{
+			.local{
+				.addr{&c->localAddress.address.sa},
+				.addrlen{c->localAddress.length}
+			},
+			.remote{
+				.addr{static_cast<ngtcp2_sockaddr*>(msg.msg_name)},
+				.addrlen{msg.msg_namelen}
+			}
+		};
+
+		const int rv{ngtcp2_conn_read_pkt(c->quicConnection.get(), &path, &pi, buf.data(),
+			static_cast<std::size_t>(nread), timestamp())};
+		if (rv != 0)
+			throw std::runtime_error{fmt::format("ngtcp2_conn_read_pkt: {}", ngtcp2_strerror(rv))};
+	}
+}
+
+void ClientSendDatagram(CNetClientSession::Quic* c, const std::span<const std::uint8_t> data)
+{
+	iovec iov{
+		.iov_base = const_cast<std::uint8_t*>(data.data()),
+		.iov_len = data.size(),
+	};
+	msghdr msg{};
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+
+	ssize_t nwrite;
+	do
+	{
+		nwrite = sendmsg(c->fd, &msg, 0);
+	} while (nwrite == -1 && errno == EINTR);
+
+	if (nwrite == -1)
+		throw std::runtime_error{fmt::format("sendmsg: {}", strerror(errno))};
+}
+
+void ClientWriteStreams(CNetClientSession::Quic* c)
+{
+	const ngtcp2_tstamp ts{timestamp()};
+	ngtcp2_pkt_info pi;
+	std::array<uint8_t, MAX_UDP_PAYLOAD_SIZE> buffer;
+
+	ngtcp2_path_storage ps;
+	ngtcp2_path_storage_zero(&ps);
+	std::uint32_t flags{NGTCP2_WRITE_STREAM_FLAG_MORE};
+
+	while (true)
+	{
+		ngtcp2_vec datav;
+		std::int64_t streamId;
+
+		const auto bytesToSend = c->streams.has_value() ? c->streams.value().PeekData() : std::nullopt;
+		if (c->streams.has_value() && bytesToSend.has_value())
+		{
+			datav.base = const_cast<uint8_t*>(bytesToSend->data());
+			datav.len = bytesToSend->size();
+			streamId = c->streams.value().m_Id;
+		}
+		else
+		{
+			datav.base = nullptr;
+			datav.len = 0;
+			streamId = -1;
+			if (c->streams.has_value())
+				flags &= ~NGTCP2_WRITE_STREAM_FLAG_MORE;
+		}
+
+		ngtcp2_ssize wdatalen;
+		const ngtcp2_ssize nwrite = ngtcp2_conn_writev_stream(c->quicConnection.get(), &ps.path, &pi,
+			buffer.data(), buffer.size(), &wdatalen, flags, streamId, &datav, 1, ts);
+		if (nwrite < 0)
+		{
+			if (nwrite == NGTCP2_ERR_STREAM_DATA_BLOCKED)
+			{
+				LOGWARNING("blocked");
+				break;
+			}
+			if (nwrite != NGTCP2_ERR_WRITE_MORE)
+			{
+				throw std::runtime_error{fmt::format("ngtcp2_conn_writev_stream: {}",
+					ngtcp2_strerror(static_cast<int>(nwrite)))};
+			}
+			if (c->streams.has_value() && wdatalen > 0)
+				c->streams.value().MarkSent(wdatalen);
+			continue;
+		}
+
+		if (nwrite == 0)
+			break;
+
+		if (c->streams.has_value() && wdatalen > 0)
+			c->streams.value().MarkSent(wdatalen);
+
+		ClientSendDatagram(c, {buffer.data(), static_cast<std::size_t>(nwrite)});
+	}
+	ngtcp2_conn_update_pkt_tx_time(c->quicConnection.get(), timestamp());
+}
+
+void ClientHandleExpiry(CNetClientSession::Quic* c)
+{
+	if (const int rv = ngtcp2_conn_handle_expiry(c->quicConnection.get(), timestamp()))
+		throw std::runtime_error{fmt::format("ngtcp2_conn_handle_expiry: {}", ngtcp2_strerror(rv))};
+}
+
+ngtcp2_conn *GetConnection(ngtcp2_crypto_conn_ref* conn_ref)
+{
+	CNetClientSession::Quic* c{static_cast<CNetClientSession::Quic*>(conn_ref->user_data)};
+	return c->quicConnection.get();
+}
+
+void ClientInit(CNetClientSession& session, const char* host, const std::uint16_t port)
+{
+	*session.m_Quic = CNetClientSession::Quic{};
+
+	const auto [descriptor, remoteAddress] = CreateSocket(host, port);
+	session.m_Quic->fd = descriptor;
+
+	session.m_Quic->localAddress = ConnectSocket(session.m_Quic->fd, remoteAddress);
+
+	ClientGnutlsInit(session.m_Quic.get());
+
+	ClientQuicInit(session, remoteAddress, session.m_Quic->localAddress);
+
+	session.m_Quic->connectionReference.get_conn = &GetConnection;
+	session.m_Quic->connectionReference.user_data = session.m_Quic.get();
+}
+} // anonymous namespace
 
 CNetClientSession::CNetClientSession(CNetClient& client) :
-	m_Client(client), m_FileTransferer(*this)
+	m_Client(client), m_FileTransferer(*this),
+	m_Quic(std::make_unique<Quic>())
 {
 }
 
 CNetClientSession::~CNetClientSession()
 {
 	ENSURE(!m_LoopRunning);
+
+	constexpr ngtcp2_ccerr reason{
+		.type{NGTCP2_CCERR_TYPE_TRANSPORT},
+		.error_code{0}
+	};
+
+	std::array<std::uint8_t, MAX_UDP_PAYLOAD_SIZE> buffer;
+	const ngtcp2_ssize amount{ngtcp2_conn_write_connection_close(m_Quic->quicConnection.get(), nullptr, nullptr, buffer.data(),
+		buffer.size(), &reason, timestamp())};
+	if (amount <= 0)
+	{
+		LOGERROR("closing connection %s", ngtcp2_strerror(amount));
+	}
+
+	ClientSendDatagram(m_Quic.get(), {buffer.data(), static_cast<std::size_t>(amount)});
 }
 
-bool CNetClientSession::Connect(const CStr& server, const u16 port, ENetHost* enetClient)
+bool CNetClientSession::Connect(const CStr& server, const u16 port)
 {
 	ENSURE(!m_LoopRunning);
-	ENSURE(!m_Host);
-	ENSURE(!m_Server);
 
-	// Create ENet host if necessary.
+	ClientInit(*this, server.c_str(), port);
-	m_Host.reset(enetClient != nullptr ? enetClient : PS::Enet::CreateHost(nullptr, 1, CHANNEL_COUNT));
+	ClientWriteStreams(m_Quic.get());
 
-	if (!m_Host)
+	m_Stats = std::make_unique<CNetStatsTable>(m_Quic->quicConnection.get());
-		return false;
-
-	// Bind to specified host
-	ENetAddress addr;
-	addr.port = port;
-	if (enet_address_set_host(&addr, server.c_str()) < 0)
-		return false;
-
-	// Initiate connection to server
-	m_Server.reset(enet_host_connect(m_Host.get(), &addr, CHANNEL_COUNT, 0));
-	if (!m_Server)
-		return false;
-
-
-	m_Stats = std::make_unique<CNetStatsTable>(*m_Server);
 	if (CProfileViewer::IsInitialised())
 		g_ProfileViewer.AddRootTable(m_Stats.get());
 
@@ -84,14 +446,24 @@ void CNetClientSession::RunNetLoop(CNetClientSession* session)
 
 	while (!session->m_ShouldShutdown)
 	{
-		ENSURE(session->m_Host && session->m_Server);
+		// ENSURE(session->m_Host && session->m_Server);
 
 		session->m_FileTransferer.Poll();
-		session->Poll();
+		try {
+			session->Poll();
+		}
+		catch (std::runtime_error&)
+		{
+			// Report immediately.
+			LOGMESSAGE("Net client: Disconnected");
+			session->m_Connected = false;
+			session->m_IncomingMessages.push(Disconnect{});
+			return;
+		}
 		session->Flush();
 
-		session->m_LastReceivedTime = enet_time_get() - session->m_Server->lastReceiveTime;
+		// session->m_LastReceivedTime = timestamp() - session->m_Server->lastReceiveTime;
-		session->m_MeanRTT = session->m_Server->roundTripTime;
+		// session->m_MeanRTT = session->m_Server->roundTripTime;
 	}
 
 	session->m_LoopRunning = false;
@@ -107,96 +479,77 @@ void CNetClientSession::Shutdown()
 
 void CNetClientSession::Poll()
 {
-	ENetEvent event;
+	pollfd pfd{
+		.fd{m_Quic->fd},
+		.events{POLLIN}
+	};
 
-	// Use the timeout to make the thread wait and save CPU time.
+	const int ret{poll(&pfd, 1, NETCLIENT_POLL_TIMEOUT)};
-	if (enet_host_service(m_Host.get(), &event, NETCLIENT_POLL_TIMEOUT) <= 0)
+	if (ret < 0)
+	{
+		LOGERROR("Error while waiting for poll: %s", std::strerror(errno));
 		return;
-
-	if (event.type == ENET_EVENT_TYPE_CONNECT)
-	{
-		ENSURE(event.peer == m_Server.get());
-
-		// Report the server address immediately.
-		char hostname[256] = "(error)";
-		enet_address_get_host_ip(&event.peer->address, hostname, ARRAY_SIZE(hostname));
-		LOGMESSAGE("Net client: Connected to %s:%u", hostname, (unsigned int)event.peer->address.port);
-		m_Connected = true;
-		m_WasConnected = true;
-
-		m_IncomingMessages.push(event);
 	}
-	else if (event.type == ENET_EVENT_TYPE_DISCONNECT)
+	if (ret == 0)
 	{
-		ENSURE(event.peer == m_Server.get());
+		ClientHandleExpiry(m_Quic.get());
-
+		ClientWriteStreams(m_Quic.get());
-		// Report immediately.
+		return;
-		LOGMESSAGE("Net client: Disconnected");
-		m_Connected = false;
-
-		m_IncomingMessages.push(event);
 	}
-	else if (event.type == ENET_EVENT_TYPE_RECEIVE)
+
-		m_IncomingMessages.push(event);
+	ClientRead(m_Quic.get());
+	ClientWriteStreams(m_Quic.get());
 }
 
 void CNetClientSession::Flush()
 {
-	ENetPacket* packet;
+	std::vector<std::uint8_t>* message;
-	while (m_OutgoingMessages.pop(packet))
+	while (m_OutgoingMessages.pop(message))
-		if (enet_peer_send(m_Server.get(), CNetHost::DEFAULT_CHANNEL, packet) < 0)
+	{
-		{
+		std::unique_ptr<std::vector<std::uint8_t>> data{message};
-			// Report the error, but do so silently if we know we are disconnected.
+		if (m_Quic->streams.has_value())
-			if (m_Connected)
+			m_Quic->streams.value().PushData(std::move(*data));
-				LOGERROR("NetClient: Failed to send packet to server");
+		else
-			else
+			LOGERROR("no stream to send message");
-				LOGMESSAGE("NetClient: Failed to send packet to server");
+	}
-		}
-
-	enet_host_flush(m_Host.get());
 }
 
 void CNetClientSession::ProcessPolledMessages()
 {
-	ENetEvent event;
+	IncommingMessage query{};
-	while(m_IncomingMessages.pop(event))
+	while(m_IncomingMessages.pop(query))
 	{
-		if (event.type == ENET_EVENT_TYPE_CONNECT)
+		std::visit([&]<typename Message>(Message message)
-			m_Client.HandleConnect();
-		else if (event.type == ENET_EVENT_TYPE_DISCONNECT)
 		{
-			// This deletes the session, so we must break;
+			if constexpr (std::same_as<Message, ConnectionEstablished>)
-			if (event.data == 0 && !m_WasConnected)
-				m_Client.HandleDisconnect(NDR_CONNECTION_REQUEST_TIMED_OUT);
-			else
-				m_Client.HandleDisconnect(event.data);
-			break;
-		}
-		else if (event.type == ENET_EVENT_TYPE_RECEIVE)
-		{
-			CNetMessage* msg = CNetMessageFactory::CreateMessage(event.packet->data, event.packet->dataLength, m_Client.GetScriptInterface());
-			if (msg)
 			{
-				LOGMESSAGE("Net client: Received message %s of size %lu from server", msg->ToString().c_str(), (unsigned long)msg->GetSerializedLength());
+				m_Client.HandleConnect();
-
-				m_Client.HandleMessage(msg);
 			}
-			// Thread-safe
+			else if constexpr (std::same_as<Message, Disconnect>)
-			enet_packet_destroy(event.packet);
+			{
-		}
+				m_Client.HandleDisconnect(NDR_UNKNOWN);
+			}
+			else
+			{
+				static_assert(std::same_as<Message, std::vector<std::uint8_t>*>);
+				std::unique_ptr<std::vector<std::uint8_t>> data{message};
+				CNetMessage* msg = CNetMessageFactory::CreateMessage(*data, m_Client.GetScriptInterface());
+				if (msg)
+				{
+					LOGMESSAGE("Net client: Received message %s of size %lu from server", msg->ToString().c_str(), (unsigned long)msg->GetSerializedLength());
+
+					m_Client.HandleMessage(msg);
+				}
+			}
+		}, query);
 	}
 }
 
 bool CNetClientSession::SendMessage(const CNetMessage* message)
 {
-	ENSURE(m_Host && m_Server);
+	// ENSURE(m_Host && m_Server);
 
-	// Thread-safe.
+	if (!m_OutgoingMessages.push(new std::vector{CNetHost::CreatePacket(message)}))
-	ENetPacket* packet = CNetHost::CreatePacket(message);
-	if (!packet)
-		return false;
-
-	if (!m_OutgoingMessages.push(packet))
 	{
 		LOGERROR("NetClient: Failed to push message on the outgoing queue.");
 		return false;
@@ -207,17 +560,11 @@ bool CNetClientSession::SendMessage(const CNetMessage* message)
 
 u32 CNetClientSession::GetLastReceivedTime() const
 {
-	if (!m_Server)
-		return 0;
-
 	return m_LastReceivedTime;
 }
 
 u32 CNetClientSession::GetMeanRTT() const
 {
-	if (!m_Server)
-		return 0;
-
 	return m_MeanRTT;
 }
 

source/network/NetClientSession.h

@@ -19,7 +19,6 @@
 #define NETSESSION_H
 
 #include "lib/code_annotation.h"
-#include "lib/external_libraries/enet.h"
 #include "lib/types.h"
 #include "network/NetFileTransfer.h"
 #include "network/NetHost.h"
@@ -32,8 +31,6 @@ class CNetMessage;
 class CNetStatsTable;
 class CStr;
 
-typedef struct _ENetHost ENetHost;
-
 /**
  * @file
  * Network client/server sessions.
@@ -53,10 +50,11 @@ class CNetClientSession
 	NONCOPYABLE(CNetClientSession);
 
 public:
+	struct Quic;
 	CNetClientSession(CNetClient& client);
 	~CNetClientSession();
 
-	bool Connect(const CStr& server, const u16 port, ENetHost* enetClient);
+	bool Connect(const CStr& server, const u16 port);
 
 	/**
 	 * The client NetSession is threaded to avoid getting timeouts if the main thread hangs.
@@ -104,11 +102,14 @@ private:
 	CNetClient& m_Client;
 
 	CNetFileTransferer m_FileTransferer;
-
+public:
 	// Net messages received and waiting for fetching.
-	boost::lockfree::queue<ENetEvent> m_IncomingMessages{16};
+	struct ConnectionEstablished{};
+	struct Disconnect{};
+	using IncommingMessage = std::variant<ConnectionEstablished, std::vector<std::uint8_t>*, Disconnect>;
+	boost::lockfree::queue<IncommingMessage> m_IncomingMessages{16};
 	// Net messages to send on the next flush() call.
-	boost::lockfree::queue<ENetPacket*> m_OutgoingMessages{16};
+	boost::lockfree::queue<std::vector<std::uint8_t>*> m_OutgoingMessages{16};
 
 	// Last known state. If false, flushing errors are silenced.
 	bool m_Connected{false};
@@ -116,7 +117,7 @@ private:
 	// Whether this session was ever connected to the server.
 	bool m_WasConnected{false};
 
-	// Wrapper around enet stats - those are atomic as the code is lock-free.
+	// Wrapper around stats - those are atomic as the code is lock-free.
 	std::atomic<u32> m_LastReceivedTime{0};
 	std::atomic<u32> m_MeanRTT{0};
 
@@ -124,9 +125,9 @@ private:
 	std::atomic<bool> m_LoopRunning{false};
 	std::atomic<bool> m_ShouldShutdown{false};
 
-	std::unique_ptr<ENetHost, DestroyHost> m_Host;
-	std::unique_ptr<ENetPeer, DestroyPeer> m_Server;
 	std::unique_ptr<CNetStatsTable> m_Stats;
+
+	const std::unique_ptr<Quic> m_Quic;
 };
 
 #endif	// NETSESSION_H

source/network/NetClientTurnManager.cpp

@@ -63,7 +63,7 @@ void CNetClientTurnManager::PostCommand(JS::HandleValue data)
 	// TODO: we should do this when the server stops sending our commands back to us
 }
 
-void CNetClientTurnManager::NotifyFinishedOwnCommands(u32 turn)
+void CNetClientTurnManager::NotifyFinishedOwnCommands(turn_id_t turn)
 {
 	NETCLIENTTURN_LOG("NotifyFinishedOwnCommands(%d)\n", turn);
 
@@ -79,7 +79,7 @@ void CNetClientTurnManager::NotifyFinishedOwnCommands(u32 turn)
 	m_NetClient.SendMessage(&msg);
 }
 
-void CNetClientTurnManager::NotifyFinishedUpdate(u32 turn, const UpdateCallback&)
+void CNetClientTurnManager::NotifyFinishedUpdate(turn_id_t turn, const UpdateCallback&)
 {
 	bool quick = !TurnNeedsFullHash(turn);
 	std::string hash;
@@ -110,10 +110,10 @@ void CNetClientTurnManager::OnDestroyConnection()
 void CNetClientTurnManager::OnSimulationMessage(CSimulationMessage* msg)
 {
 	// Command received from the server - store it for later execution
-	AddCommand(msg->m_Client, msg->m_Player, msg->m_Data, msg->m_Turn);
+	AddCommand(msg->m_Client, msg->m_Player, msg->m_Data, static_cast<turn_id_t>(msg->m_Turn));
 }
 
-void CNetClientTurnManager::OnSyncError(u32 turn, const CStr& expectedHash, const std::vector<CSyncErrorMessage::S_m_PlayerNames>& playerNames)
+void CNetClientTurnManager::OnSyncError(turn_id_t turn, const CStr& expectedHash, const std::vector<CSyncErrorMessage::S_m_PlayerNames>& playerNames)
 {
 	CStr expectedHashHex(Hexify(expectedHash));
 	NETCLIENTTURN_LOG("OnSyncError(%d, %hs)\n", turn, expectedHashHex.c_str());

source/network/NetClientTurnManager.h

@@ -49,12 +49,12 @@ public:
 	 */
 	void OnDestroyConnection();
 
-	void OnSyncError(u32 turn, const CStr& expectedHash, const std::vector<CSyncErrorMessage::S_m_PlayerNames>& playerNames);
+	void OnSyncError(turn_id_t turn, const CStr& expectedHash, const std::vector<CSyncErrorMessage::S_m_PlayerNames>& playerNames);
 
 private:
-	void NotifyFinishedOwnCommands(u32 turn) override;
+	void NotifyFinishedOwnCommands(turn_id_t turn) override;
 
-	void NotifyFinishedUpdate(u32 turn, const UpdateCallback& sendEventToAll) override;
+	void NotifyFinishedUpdate(turn_id_t turn, const UpdateCallback& sendEventToAll) override;
 
 	CNetClient& m_NetClient;
 };

source/network/NetHost.cpp

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Wildfire Games.
+/* Copyright (C) 2026 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -25,32 +25,10 @@
 #include "ps/CLogger.h"
 
 #include <cstddef>
+#include <numeric>
 #include <vector>
 
-bool CNetHost::SendMessage(const CNetMessage* message, ENetPeer* peer, const char* peerName)
+std::vector<std::uint8_t> CNetHost::CreatePacket(const CNetMessage* message)
-{
-	ENetPacket* packet = CreatePacket(message);
-	if (!packet)
-		return false;
-
-	LOGMESSAGE("Net: Sending message %s of size %lu to %s", message->ToString().c_str(), (unsigned long)packet->dataLength, peerName);
-
-	// Let ENet send the message to peer
-	if (enet_peer_send(peer, DEFAULT_CHANNEL, packet) < 0)
-	{
-		LOGERROR("Net: Failed to send packet to peer");
-		return false;
-	}
-
-	// Don't call enet_host_flush now - let it queue up all the packets
-	// and send them during the next frame
-	//
-	// TODO: we should flush explicitly at some appropriate point before the next frame
-
-	return true;
-}
-
-ENetPacket* CNetHost::CreatePacket(const CNetMessage* message)
 {
 	size_t size = message->GetSerializedLength();
 
@@ -63,12 +41,7 @@ ENetPacket* CNetHost::CreatePacket(const CNetMessage* message)
 	// Save message to internal buffer
 	message->Serialize(&buffer[0]);
 
-	// Create a reliable packet
+	return buffer;
-	ENetPacket* packet = enet_packet_create(&buffer[0], size, ENET_PACKET_FLAG_RELIABLE);
-	if (!packet)
-		LOGERROR("Net: Failed to construct packet");
-
-	return packet;
 }
 
 void CNetHost::Initialize()
@@ -81,3 +54,81 @@ void CNetHost::Deinitialize()
 {
 	enet_deinitialize();
 }
+
+
+Stream::Stream(const std::int64_t streamId):
+	m_Id{streamId}
+{}
+
+void Stream::PushData(std::vector<std::uint8_t> data)
+{
+	m_SendBuffer.push_back(std::move(data));
+}
+
+void Stream::PushMessage(const CNetMessage* message)
+{
+	m_SendBuffer.push_back(CNetHost::CreatePacket(message));
+}
+
+std::optional<std::span<const std::uint8_t>> Stream::PeekData()
+{
+	const std::size_t startOffset{m_SentOffset - m_AckedOffset};
+	std::size_t offset{0};
+
+	for (std::vector<std::uint8_t>& bytes : m_SendBuffer)
+	{
+		if (startOffset - offset < bytes.size())
+		{
+			const std::size_t temp{startOffset - offset};
+			return std::span{bytes.data() + temp, bytes.size() - temp};
+		}
+
+		offset += bytes.size();
+	}
+
+	return std::nullopt;
+}
+
+void Stream::MarkSent(const std::size_t offset)
+{
+	m_SentOffset += offset;
+}
+
+void Stream::MarkAcknowledged(const std::size_t offset)
+{
+	while (!m_SendBuffer.empty())
+	{
+		std::vector<uint8_t>& head{m_SendBuffer.front()};
+		if (m_AckedOffset + head.size() > offset)
+			break;
+
+		m_AckedOffset += head.size();
+		m_SendBuffer.pop_front();
+	}
+}
+
+std::optional<std::vector<std::uint8_t>> Stream::Receive(const std::span<const std::uint8_t> data)
+{
+	m_ReceiveBuffer.emplace_back(data.begin(), data.end());
+	const std::size_t bufferSize{std::transform_reduce(m_ReceiveBuffer.begin(), m_ReceiveBuffer.end(),
+		static_cast<std::size_t>(0), std::plus<>{}, std::mem_fn(&std::vector<std::uint8_t>::size))};
+	if (bufferSize < 3)
+		return std::nullopt;
+	const auto& message = m_ReceiveBuffer.front();
+
+	auto bufferIter = message.begin();
+	std::size_t messageSize;
+	Deserialize_int_1(bufferIter, std::ignore);
+	Deserialize_int_2(bufferIter, messageSize);
+	if (messageSize > bufferSize)
+		return std::nullopt;
+
+	std::vector<std::uint8_t> messageCopy;
+	while (messageCopy.size() < messageSize)
+	{
+		messageCopy.insert(messageCopy.end(), m_ReceiveBuffer.front().begin(),
+			m_ReceiveBuffer.front().end());
+		m_ReceiveBuffer.pop_front();
+	}
+	return messageCopy;
+}

source/network/NetHost.h

@@ -27,7 +27,14 @@
 #include "lib/types.h"
 #include "ps/CStr.h"
 
+#include <deque>
 #include <map>
+#include <ngtcp2/ngtcp2.h>
+#include <optional>
+#include <span>
+#include <vector>
+
+#include <gnutls/gnutls.h>
 
 class CNetMessage;
 
@@ -35,6 +42,38 @@ typedef struct _ENetPeer ENetPeer;
 typedef struct _ENetPacket ENetPacket;
 typedef struct _ENetHost ENetHost;
 
+constexpr std::size_t MAX_UDP_PAYLOAD_SIZE{64 * KiB};
+
+struct CredentialsDeleter
+{
+	void operator()(const gnutls_certificate_credentials_t cred) const
+	{
+		gnutls_certificate_free_credentials(cred);
+	}
+};
+
+struct SessionDeleter
+{
+	void operator()(const gnutls_session_t p) const
+	{
+		gnutls_deinit(p);
+	}
+};
+
+struct ConnectionDeleter
+{
+	void operator()(ngtcp2_conn* p) const
+	{
+		ngtcp2_conn_del(p);
+	}
+};
+
+struct AddressStorage
+{
+	ngtcp2_sockaddr_union address;
+	ngtcp2_socklen length{sizeof(address)};
+};
+
 struct PlayerAssignment
 {
 	/**
@@ -106,20 +145,11 @@ class CNetHost
 public:
 	static const int DEFAULT_CHANNEL = 0;
 
-	/**
-	 * Transmit a message to the given peer.
-	 * @param message message to send
-	 * @param peer peer to send to
-	 * @param peerName name of peer for debug logs
-	 * @return true on success, false on failure
-	 */
-	static bool SendMessage(const CNetMessage* message, ENetPeer* peer, const char* peerName);
-
 	/**
 	 * Construct an ENet packet by serialising the given message.
 	 * @return NULL on failure
 	 */
-	static ENetPacket* CreatePacket(const CNetMessage* message);
+	static std::vector<std::uint8_t> CreatePacket(const CNetMessage* message);
 
 	/**
 	 * Initialize ENet.
@@ -133,4 +163,25 @@ public:
 	static void Deinitialize();
 };
 
+class Stream
+{
+public:
+	Stream(const std::int64_t streamId);
+
+	void PushData(std::vector<std::uint8_t> data);
+	void PushMessage(const CNetMessage* message);
+	std::optional<std::span<const std::uint8_t>> PeekData();
+	void MarkSent(const std::size_t offset);
+	void MarkAcknowledged(const std::size_t offset);
+	std::optional<std::vector<std::uint8_t>> Receive(const std::span<const std::uint8_t> data);
+
+	std::int64_t m_Id;
+private:
+	std::deque<std::vector<std::uint8_t>> m_SendBuffer;
+	std::deque<std::vector<std::uint8_t>> m_ReceiveBuffer;
+	/* invariant: m_SentOffset >= m_AckedOffset */
+	std::size_t m_SentOffset{0};
+	std::size_t m_AckedOffset{0};
+};
+
 #endif	// NETHOST_H

source/network/NetMessage.cpp

@@ -53,10 +53,7 @@ u8* CNetMessage::Serialize(u8* pBuffer) const
 const u8* CNetMessage::Deserialize(const u8* pStart, const u8* pEnd)
 {
 	if (pStart + 3 > pEnd)
-	{
+		throw std::invalid_argument{"CNetMessage: Corrupt packet (smaller than header)"};
-		LOGERROR("CNetMessage: Corrupt packet (smaller than header)");
-		return NULL;
-	}
 
 	const u8* pBuffer = pStart;
 
@@ -67,10 +64,7 @@ const u8* CNetMessage::Deserialize(const u8* pStart, const u8* pEnd)
 	m_Type = (NetMessageType)type;
 
 	if (pStart + size != pEnd)
-	{
+		throw std::invalid_argument{fmt::format("CNetMessage: Corrupt packet (incorrect size) %i %i", size, pEnd - pStart)};
-		LOGERROR("CNetMessage: Corrupt packet (incorrect size)");
-		return NULL;
-	}
 
 	return pBuffer;
 }
@@ -88,18 +82,17 @@ CStr CNetMessage::ToString() const
 	if (GetType() == NMT_INVALID)
 		return "MESSAGE_TYPE_NONE { Undefined Message }";
 	else
-		return "Unknown Message " + CStr::FromInt(GetType());
+		return fmt::format("Unknown Message {}", static_cast<int>(GetType()));
 }
 
-CNetMessage* CNetMessageFactory::CreateMessage(const void* pData,
+CNetMessage* CNetMessageFactory::CreateMessage(const std::span<const std::uint8_t> data,
-											   size_t dataSize,
+	const Script::Interface& scriptInterface)
-											   const Script::Interface& scriptInterface)
 {
 	CNetMessage* pNewMessage = NULL;
 	CNetMessage header;
 
 	// Figure out message type
-	header.Deserialize((const u8*)pData, (const u8*)pData + dataSize);
+	header.Deserialize(std::to_address(data.begin()), std::to_address(data.end()));
 
 	switch (header.GetType())
 	{
@@ -230,7 +223,7 @@ CNetMessage* CNetMessageFactory::CreateMessage(const void* pData,
 	}
 
 	if (pNewMessage)
-		pNewMessage->Deserialize((const u8*)pData, (const u8*)pData + dataSize);
+		pNewMessage->Deserialize(std::to_address(data.begin()), std::to_address(data.end()));
 
 	return pNewMessage;
 }

source/network/NetMessage.h

@@ -27,6 +27,7 @@
 #include <js/RootingAPI.h>
 #include <js/TypeDecls.h>
 #include <js/Value.h>
+#include <span>
 
 namespace Script { class Interface; }
 
@@ -108,12 +109,12 @@ public:
 	/**
 	 * Factory method which creates a message object based on the given data
 	 *
-	 * @param pData						Data buffer
+	 * @param data						Data buffer
-	 * @param dataSize					Size of data buffer
 	 * @param scriptInterface			Script instance to use when constructing scripted messages
 	 * @return							The new message created
 	 */
-	static CNetMessage* CreateMessage(const void* pData, size_t dataSize, const Script::Interface& scriptInterface);
+	static CNetMessage* CreateMessage(const std::span<const std::uint8_t> data,
+		const Script::Interface& scriptInterface);
 };
 
 /**
@@ -139,7 +140,7 @@ public:
 
 	u32 m_Client;
 	i32 m_Player;
-	u32 m_Turn;
+	i32 m_Turn;
 	JS::PersistentRooted<JS::Value> m_Data;
 private:
 	const Script::Interface& m_ScriptInterface;

source/network/NetMessageSim.cpp

@@ -35,6 +35,7 @@
 #include <js/Value.h>
 #include <sstream>
 #include <string>
+#include "ps/CLogger.h"
 
 namespace Script { class Interface; }
 
@@ -150,7 +151,7 @@ u8* CSimulationMessage::Serialize(u8* pBuffer) const
 	CBufferBinarySerializer serializer(m_ScriptInterface, pos);
 	serializer.NumberU32_Unbounded("client", m_Client);
 	serializer.NumberI32_Unbounded("player", m_Player);
-	serializer.NumberU32_Unbounded("turn", m_Turn);
+	serializer.NumberI32_Unbounded("turn", m_Turn);
 
 	serializer.ScriptVal("command", const_cast<JS::PersistentRootedValue*>(&m_Data));
 	return serializer.GetBuffer();
@@ -165,7 +166,7 @@ const u8* CSimulationMessage::Deserialize(const u8* pStart, const u8* pEnd)
 	CStdDeserializer deserializer(m_ScriptInterface, stream);
 	deserializer.NumberU32_Unbounded("client", m_Client);
 	deserializer.NumberI32_Unbounded("player", m_Player);
-	deserializer.NumberU32_Unbounded("turn", m_Turn);
+	deserializer.NumberI32_Unbounded("turn", m_Turn);
 	deserializer.ScriptVal("command", &m_Data);
 	return pEnd;
 }
@@ -177,7 +178,7 @@ size_t CSimulationMessage::GetSerializedLength() const
 	CLengthBinarySerializer serializer(m_ScriptInterface);
 	serializer.NumberU32_Unbounded("client", m_Client);
 	serializer.NumberI32_Unbounded("player", m_Player);
-	serializer.NumberU32_Unbounded("turn", m_Turn);
+	serializer.NumberI32_Unbounded("turn", m_Turn);
 
 	// TODO: The cast can probably be removed if and when ScriptVal can take a JS::HandleValue instead of
 	// a JS::MutableHandleValue (relies on JSAPI change). Also search for other casts like this one in that case.

source/network/NetMessages.h

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Wildfire Games.
+/* Copyright (C) 2026 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -27,7 +27,7 @@
 
 #define PS_PROTOCOL_MAGIC                         0x5073013f	// 'P', 's', 0x01, '?'
 #define PS_PROTOCOL_MAGIC_RESPONSE                0x50630121	// 'P', 'c', 0x01, '!'
-#define PS_PROTOCOL_VERSION                       0x01010019	// Arbitrary protocol
+#define PS_PROTOCOL_VERSION                       0x0101001A	// Arbitrary protocol
 #define PS_DEFAULT_PORT                           0x5073		// 'P', 's'
 
 // Set when lobby authentication is required. Used in the SrvHandshakeResponseMessage.
@@ -231,7 +231,7 @@ START_NMT_CLASS_(ClientPaused, NMT_CLIENT_PAUSED)
 END_NMT_CLASS()
 
 START_NMT_CLASS_(LoadedGame, NMT_LOADED_GAME)
-	NMT_FIELD_INT(m_CurrentTurn, u32, 4)
+	NMT_FIELD_INT(m_CurrentTurn, i32, 4)
 END_NMT_CLASS()
 
 START_NMT_CLASS_(GameStart, NMT_GAME_START)
@@ -243,17 +243,17 @@ START_NMT_CLASS_(GameSavedStart, NMT_SAVED_GAME_START)
 END_NMT_CLASS()
 
 START_NMT_CLASS_(EndCommandBatch, NMT_END_COMMAND_BATCH)
-	NMT_FIELD_INT(m_Turn, u32, 4)
+	NMT_FIELD_INT(m_Turn, i32, 4)
 	NMT_FIELD_INT(m_TurnLength, u32, 2)
 END_NMT_CLASS()
 
 START_NMT_CLASS_(SyncCheck, NMT_SYNC_CHECK)
-	NMT_FIELD_INT(m_Turn, u32, 4)
+	NMT_FIELD_INT(m_Turn, i32, 4)
 	NMT_FIELD(CStr, m_Hash)
 END_NMT_CLASS()
 
 START_NMT_CLASS_(SyncError, NMT_SYNC_ERROR)
-	NMT_FIELD_INT(m_Turn, u32, 4)
+	NMT_FIELD_INT(m_Turn, i32, 4)
 	NMT_FIELD(CStr, m_HashExpected)
 	NMT_START_ARRAY(m_PlayerNames)
 		NMT_FIELD(CStrW, m_Name)

source/network/NetProtocol.cpp

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Wildfire Games.
+/* Copyright (C) 2026 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -19,10 +19,14 @@
 
 #include "NetProtocol.h"
 
+#include "ps/CLogger.h"
 #include "ps/CStr.h"
 
 #include <algorithm>
+#include <chrono>
 #include <cstdint>
+#include <ngtcp2/ngtcp2.h>
+#include <gnutls/crypto.h>
 
 namespace
 {
@@ -59,3 +63,36 @@ std::optional<HandshakeError> CheckHandshake(const CSrvHandshakeMessage& serverM
 
 	return {};
 }
+
+uint64_t timestamp()
+{
+	return std::chrono::duration_cast<std::chrono::nanoseconds>(
+		std::chrono::steady_clock::now().time_since_epoch()).count();
+}
+
+void increaseWindow(ngtcp2_conn* conn, const std::uint64_t streamId, const std::uint64_t size)
+{
+	ngtcp2_conn_extend_max_offset(conn, size);
+	ngtcp2_conn_extend_max_stream_offset(conn, streamId, size);
+}
+
+void OnRandomRequest(std::uint8_t* destination, const std::size_t destinationLength, const ngtcp2_rand_ctx*)
+{
+	const int ret{gnutls_rnd(GNUTLS_RND_RANDOM, destination, destinationLength)};
+	if (ret < 0)
+		LOGERROR("gnutls_rnd: %s", gnutls_strerror(ret));
+}
+
+int OnNewConnectionIdRequest(ngtcp2_conn*, ngtcp2_cid* cid, std::uint8_t* token, const std::size_t cidlen,
+	void* /*userData*/)
+{
+	if (gnutls_rnd(GNUTLS_RND_RANDOM, cid->data, cidlen))
+		return NGTCP2_ERR_CALLBACK_FAILURE;
+
+	cid->datalen = cidlen;
+
+	if (gnutls_rnd (GNUTLS_RND_RANDOM, token, NGTCP2_STATELESS_RESET_TOKENLEN))
+		return NGTCP2_ERR_CALLBACK_FAILURE;
+
+	return 0;
+}

source/network/NetProtocol.h

@@ -27,11 +27,17 @@
 #include <type_traits>
 #include <vector>
 
+#include <gnutls/gnutls.h>
+
 /**
  * Report the peer if we didn't receive a packet after this time (milliseconds).
  */
 inline constexpr u32 NETWORK_WARNING_TIMEOUT{2000};
 
+inline constexpr const char* TLS_PRIORITY{
+	"PERFORMANCE:-VERS-DTLS-ALL:-VERS-TLS1.0:-VERS-TLS1.1:-VERS-TLS1.2:-SHA1:-AES-128-CBC:-AES-256-CBC:"
+	"-SIGN-RSA-SHA1:-SIGN-ECDSA-SHA1:%DISABLE_TLS13_COMPAT_MODE"};
+
 struct HandshakeError
 {
 	std::string componentType;
@@ -67,4 +73,17 @@ Message CreateHandshake() {
 
 std::optional<HandshakeError> CheckHandshake(const CSrvHandshakeMessage& serverMessage, const CCliHandshakeMessage& clientMessage);
 
+uint64_t timestamp();
+
+struct ngtcp2_conn;
+void increaseWindow(ngtcp2_conn* conn, const std::uint64_t streamId, const std::uint64_t size);
+
+struct ngtcp2_rand_ctx;
+void OnRandomRequest(std::uint8_t* destination, const std::size_t destinationLength,
+	const ngtcp2_rand_ctx*);
+
+struct ngtcp2_cid;
+int OnNewConnectionIdRequest(ngtcp2_conn*, ngtcp2_cid* cid, std::uint8_t *token, const std::size_t cidlen,
+	void* /*userData*/);
+
 #endif

source/network/NetServer.cpp

@@ -22,6 +22,7 @@
 #include "lib/code_generation.h"
 #include "lib/debug.h"
 #include "lib/external_libraries/enet.h"
+#include "lib/hash.h"
 #include "lib/secure_crt.h"
 #include "lib/status.h"
 #include "lib/types.h"
@@ -39,6 +40,8 @@
 #include "ps/CLogger.h"
 #include "ps/ConfigDB.h"
 #include "ps/GUID.h"
+#include "ps/GameSetup/CmdLineArgs.h"
+#include "ps/GameSetup/Paths.h"
 #include "ps/Hashing.h"
 #include "ps/ProfileViewer.h"
 #include "ps/Profiler2.h"
@@ -49,13 +52,26 @@
 #include "scriptinterface/Context.h"
 #include "scriptinterface/Interface.h"
 #include "scriptinterface/Request.h"
+#include "simulation2/helpers/SimulationCommand.h"
 #include "simulation2/system/TurnManager.h"
 
 #include <algorithm>
 #include <cstring>
+#include <fmt/format.h>
 #include <functional>
+#include <gnutls/crypto.h>
+#include <gnutls/gnutls.h>
+#include <gnutls/x509.h>
 #include <iterator>
 #include <memory>
+#include <netdb.h>
+#include <ngtcp2/ngtcp2.h>
+#include <ngtcp2/ngtcp2_crypto.h>
+#include <ngtcp2/ngtcp2_crypto_gnutls.h>
+#include <numeric>
+#include <poll.h>
+#include <random>
+#include <ranges>
 #include <set>
 #include <sstream>
 #include <string>
@@ -69,6 +85,10 @@
 #include <miniupnpc/upnperrors.h>
 #endif
 
+#if FMT_VERSION >= 80000
+#include <fmt/xchar.h>
+#endif
+
 /**
  * Number of peers to allocate for the enet host.
  * Limited by ENET_PROTOCOL_MAXIMUM_PEER_ID (4096).
@@ -97,15 +117,366 @@ constexpr u32 NETWORK_BAD_PING = DEFAULT_TURN_LENGTH * COMMAND_DELAY_MP / 2;
 
 CNetServer* g_NetServer = NULL;
 
-static CStr DebugName(CNetServerSession* session)
+namespace
 {
-	if (session == NULL)
+// static CStr DebugName(CNetServerSession* session)
-		return "[unknown host]";
+// {
-	if (session->GetGUID().empty())
+// 	if (session == NULL)
-		return "[unauthed host]";
+// 		return "[unknown host]";
-	return "[" + session->GetGUID().substr(0, 8) + "...]";
+// 	if (session->GetGUID().empty())
+// 		return "[unauthed host]";
+// 	return "[" + session->GetGUID().substr(0, 8) + "...]";
+// }
+
+struct CidHash
+{
+	std::size_t operator()(const ngtcp2_cid& cid) const
+	{
+		return std::accumulate(cid.data, cid.data + cid.datalen, static_cast<std::size_t>(0),
+			[](std::size_t carry, const std::uint8_t byte)
+		{
+			hash_combine(carry, byte);
+			return carry;
+		});
+	}
+};
+struct CidEqual
+{
+	bool operator()(const ngtcp2_cid& a, const ngtcp2_cid& b) const
+	{
+		return ngtcp2_cid_eq(&a, &b);
+	}
+};
+
+std::size_t ReceivePackage(const int fd, std::span<std::uint8_t> data, AddressStorage& remoteAddress)
+{
+	iovec iov{
+		.iov_base{data.data()},
+		.iov_len{data.size()}
+	};
+
+	msghdr msg{};
+	msg.msg_name = &remoteAddress.address.sa;
+	msg.msg_namelen = remoteAddress.length;
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+
+	ssize_t ret;
+	do
+		ret = recvmsg(fd, &msg, MSG_DONTWAIT);
+	while (ret < 0 && errno == EINTR);
+	if (ret < 0)
+		throw std::system_error{errno, std::generic_category(), "recvmsg"};
+
+	remoteAddress.length = msg.msg_namelen;
+	return ret;
 }
 
+void GetRandomCid(ngtcp2_cid* cid)
+{
+	std::array<std::uint8_t, NGTCP2_MAX_CIDLEN> buf;
+	const int ret{gnutls_rnd(GNUTLS_RND_RANDOM, buf.data(), buf.size())};
+	if (ret < 0)
+		throw std::runtime_error{fmt::format("gnutls_rnd: {}", gnutls_strerror(ret))};
+	ngtcp2_cid_init(cid, buf.data(), buf.size());
+}
+
+int ResolveAndBind(const char *port, AddressStorage& localAddress)
+{
+	addrinfo hints{};
+	// IPv4 clients can connect to a IPv6 socket.
+	hints.ai_family = AF_INET6;
+	hints.ai_socktype = SOCK_DGRAM;
+	hints.ai_flags = AI_PASSIVE;
+
+	addrinfo* res;
+	if (getaddrinfo(nullptr, port, &hints, &res))
+		return -1;
+	std::unique_ptr<addrinfo, decltype(&freeaddrinfo)> infoList{res, &freeaddrinfo};
+
+	int fd;
+	addrinfo* rp;
+	for (rp = res; rp; rp = rp->ai_next)
+	{
+		fd = socket(AF_INET6, rp->ai_socktype, rp->ai_protocol);
+		if (fd == -1)
+			continue;
+
+		// Allow IPv4 using the same socket.
+		const int onlyIPv6{0};
+		if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &onlyIPv6, sizeof(onlyIPv6)))
+			continue;
+
+		if (bind(fd, rp->ai_addr, rp->ai_addrlen))
+		{
+			close(fd);
+			continue;
+		}
+
+		break;
+	}
+
+	if (!rp)
+		return -1;
+
+	localAddress.address.in6 = reinterpret_cast<ngtcp2_sockaddr_in6&>(*rp->ai_addr);
+	localAddress.length = rp->ai_addrlen;
+	return fd;
+}
+
+void GenerateKeyfiles(const std::filesystem::path& privatekey, const std::filesystem::path& certificate)
+{
+	constexpr auto binaryOverrideMode = std::ios::binary | std::ios::trunc;
+	gnutls_x509_privkey_t newKey;
+	if (const int ret{gnutls_x509_privkey_init(&newKey)})
+	{
+		throw std::runtime_error{fmt::format("Error initializing privatkey: {}",
+			gnutls_strerror(ret))};
+	}
+	std::unique_ptr<gnutls_x509_privkey_int, decltype(&gnutls_x509_privkey_deinit)> keyDeleter(
+		newKey, gnutls_x509_privkey_deinit);
+
+	if (const int ret{gnutls_x509_privkey_generate(newKey, GNUTLS_PK_RSA, 3072, 0)})
+	{
+		throw std::runtime_error{fmt::format("Error generating privatkey: {}",
+			gnutls_strerror(ret))};
+	}
+
+	gnutls_datum_t exportedKey;
+	if (const int ret{gnutls_x509_privkey_export2_pkcs8(newKey, GNUTLS_X509_FMT_DER, nullptr, 0,
+		&exportedKey)})
+	{
+		throw std::runtime_error{fmt::format("Error exporting privatkey: {}",
+			gnutls_strerror(ret))};
+	}
+	const std::unique_ptr<unsigned char, decltype(gnutls_free)> exportedKeyDeleter{exportedKey.data,
+		gnutls_free};
+
+	std::ofstream{privatekey, binaryOverrideMode}.write(
+		reinterpret_cast<const char*>(exportedKey.data), exportedKey.size);
+
+
+	gnutls_x509_crt_t newCertificate;
+	if (const int ret{gnutls_x509_crt_init(&newCertificate)})
+	{
+		throw std::runtime_error{fmt::format("Error initializing certificate: {}",
+			gnutls_strerror(ret))};
+	}
+	std::unique_ptr<gnutls_x509_crt_int, decltype(&gnutls_x509_crt_deinit)> certificateDeleter(
+		newCertificate, gnutls_x509_crt_deinit);
+
+	std::array<unsigned char, 20> serialNumber;
+	auto generator = [&, randomDevice = std::random_device{},
+		distribution = std::uniform_int_distribution<unsigned char>{}]() mutable
+	{
+		return distribution(randomDevice);
+	};
+	std::ranges::generate(serialNumber, std::ref(generator));
+	std::get<0>(serialNumber) &= ~(1 << 8);
+	if (const int ret{gnutls_x509_crt_set_serial(newCertificate, serialNumber.data(),
+		serialNumber.size())})
+	{
+		throw std::runtime_error{fmt::format("Error setting serial number: {}",
+			gnutls_strerror(ret))};
+	}
+
+	if (const int ret{gnutls_x509_crt_set_activation_time(newCertificate, 0)})
+	{
+		throw std::runtime_error{fmt::format("Error setting activation time: {}",
+			gnutls_strerror(ret))};
+	}
+	if (const int ret{gnutls_x509_crt_set_expiration_time(newCertificate, -1)})
+	{
+		throw std::runtime_error{fmt::format("Error setting expiration time: {}",
+			gnutls_strerror(ret))};
+	}
+
+	if (const int ret{gnutls_x509_crt_set_key(newCertificate, newKey)})
+	{
+		throw std::runtime_error{fmt::format("Error setting certificate key: {}",
+			gnutls_strerror(ret))};
+	}
+
+	if (const int ret{gnutls_x509_crt_sign(newCertificate, newCertificate, newKey)})
+	{
+		throw std::runtime_error{fmt::format("Error signing certificate: {}",
+			gnutls_strerror(ret))};
+	}
+
+	gnutls_datum_t exportedCertificate;
+	if (const int ret{gnutls_x509_crt_export2(newCertificate, GNUTLS_X509_FMT_DER,
+		&exportedCertificate)})
+	{
+		throw std::runtime_error{fmt::format("Error exporting certificate: {}",
+			gnutls_strerror(ret))};
+	}
+	const std::unique_ptr<unsigned char, decltype(gnutls_free)> exportedCertificateDeleter{
+		exportedCertificate.data, gnutls_free};
+
+	std::ofstream{certificate, binaryOverrideMode}.write(
+		reinterpret_cast<const char*>(exportedCertificate.data), exportedCertificate.size);
+}
+
+std::unique_ptr<gnutls_certificate_credentials_st, CredentialsDeleter> CreateTlsServerCredentials()
+{
+	gnutls_certificate_credentials_t temp;
+	if (const int ret{gnutls_certificate_allocate_credentials(&temp)})
+	{
+		throw std::runtime_error{fmt::format("gnutls_certificate_allocate_credentials: {}",
+			gnutls_strerror(ret))};
+	}
+	std::unique_ptr<gnutls_certificate_credentials_st, CredentialsDeleter> cred{temp};
+
+	const auto folder = (Paths(g_CmdLineArgs).UserData() / "encryption").fileSystemPath();
+	std::filesystem::create_directory(folder);
+
+	const auto privatekeyPath{folder / "privatekey.der"};
+	const auto certificatePath{folder / "certificate.der"};
+
+	if (!std::filesystem::is_regular_file(privatekeyPath) ||
+		!std::filesystem::is_regular_file(certificatePath))
+	{
+		GenerateKeyfiles(privatekeyPath, certificatePath);
+	}
+
+	if (const int ret{gnutls_certificate_set_x509_key_file(cred.get(), certificatePath.c_str(),
+		privatekeyPath.c_str(), GNUTLS_X509_FMT_DER)})
+	{
+		throw std::runtime_error{fmt::format("gnutls_certificate_set_x509_key_file: {}",
+			gnutls_strerror(ret))};
+	}
+
+	return cred;
+}
+
+ngtcp2_settings InitSettings()
+{
+	ngtcp2_settings settings;
+	ngtcp2_settings_default(&settings);
+	settings.initial_ts = timestamp();
+	return settings;
+}
+} // anonymous namespace
+
+class CNetServerWorker::Quic
+{
+public:
+	explicit Quic(const std::uint16_t port):
+		m_SocketFd{ResolveAndBind(std::to_string(port).c_str(), m_LocalAddress)}
+	{}
+	~Quic()
+	{
+		if (m_SocketFd >= 0)
+			close(m_SocketFd);
+	}
+	AddressStorage m_LocalAddress;
+	int m_SocketFd;
+	std::unique_ptr<gnutls_certificate_credentials_st, CredentialsDeleter> m_Credentials{
+		CreateTlsServerCredentials()};
+	ngtcp2_settings m_Settings{InitSettings()};
+
+	void HandleIncoming(CNetServerWorker& server)
+	{
+		std::array<std::uint8_t, MAX_UDP_PAYLOAD_SIZE> buf;
+
+		while (true)
+		{
+			AddressStorage remoteAddress;
+
+			std::size_t n_read;
+			try
+			{
+				n_read = ReceivePackage(m_SocketFd, buf, remoteAddress);
+			}
+			catch (std::system_error& e)
+			{
+				if (e.code().value() == EAGAIN || e.code().value() == EWOULDBLOCK)
+					return;
+				throw;
+			}
+
+			ngtcp2_version_cid version;
+			if (const int ret{ngtcp2_pkt_decode_version_cid(&version, buf.data(), n_read,
+				NGTCP2_MAX_CIDLEN)})
+			{
+				throw std::runtime_error{fmt::format("ngtcp2_pkt_decode_version_cid: {}",
+					ngtcp2_strerror(ret))};
+			}
+
+			const ngtcp2_addr remote{
+				.addr{&remoteAddress.address.sa},
+				.addrlen{remoteAddress.length}
+			};
+
+			/* Find any existing connection by DCID */
+			ngtcp2_cid tempCid;
+			ngtcp2_cid_init(&tempCid, version.dcid, version.dcidlen);
+
+			const auto connectionIter = std::ranges::find_if(server.m_Sessions,
+				[&tempCid](const std::vector<ngtcp2_cid> association)
+				{
+					return std::ranges::any_of(association, [&tempCid](const ngtcp2_cid& elem)
+					{
+						return ngtcp2_cid_eq(&elem, &tempCid);
+					});
+				},
+				[](auto& connection)
+				{
+					const std::size_t amount{ngtcp2_conn_get_scid(
+						connection->m_Connection.m_QuicConnection.get(), nullptr)};
+					std::vector<ngtcp2_cid> cids(amount);
+					ngtcp2_conn_get_scid(connection->m_Connection.m_QuicConnection.get(),
+						cids.data());
+					return cids;
+				});
+
+			const bool existing{connectionIter != server.m_Sessions.end()};
+			if (!existing)
+			{
+				ngtcp2_pkt_hd header;
+				if (ngtcp2_accept(&header, buf.data(), n_read))
+					throw std::invalid_argument{"Failed parsing package header"};
+
+				ngtcp2_cid newScid;
+				GetRandomCid(&newScid);
+
+				const ngtcp2_path path{
+					.local{
+						.addr{&m_LocalAddress.address.sa},
+						.addrlen{m_LocalAddress.length}
+					},
+					.remote{remote}
+				};
+
+				server.m_Sessions.push_back(std::make_unique<CNetServerSession>(server, m_SocketFd,
+					m_Settings, m_Credentials.get(), header, newScid, path));
+				server.SetupSession(server.m_Sessions.back().get());
+			}
+			auto& session{existing ? *connectionIter : server.m_Sessions.back()};
+
+			try
+			{
+				session->m_Connection.Read(remote, {buf.data(), n_read});
+			}
+			catch (const std::system_error&)
+			{
+				throw;
+			}
+			catch (const std::runtime_error&)
+			{
+				const auto session = existing ? std::move(*connectionIter) :
+					std::move(server.m_Sessions.back());
+				if (existing)
+					server.m_Sessions.erase(connectionIter);
+				else
+					server.m_Sessions.pop_back();
+
+				session->Update(static_cast<uint>(NMT_CONNECTION_LOST), nullptr);
+			}
+		}
+	}
+};
+
 /*
  * XXX: We use some non-threadsafe functions from the worker thread.
  * See https://gitea.wildfiregames.com/0ad/0ad/issues/654
@@ -120,17 +491,17 @@ CNetServerWorker::CNetServerWorker(const bool continueSavedGame, std::uint16_t p
 	m_Password{std::move(password)}
 {
 	// Bind to default host
-	ENetAddress addr;
+	// ENetAddress addr;
-	addr.host = ENET_HOST_ANY;
+	// addr.host = ENET_HOST_ANY;
-	addr.port = port;
+	// addr.port = port;
 
 	// Create ENet server
-	m_Host.reset(PS::Enet::CreateHost(&addr, MAX_CLIENTS, CHANNEL_COUNT));
+	// m_Host.reset(PS::Enet::CreateHost(&addr, MAX_CLIENTS, CHANNEL_COUNT));
-	if (!m_Host)
+	// if (!m_Host)
-	{
+	// {
-		LOGERROR("Net server: enet_host_create failed");
+	// 	LOGERROR("Net server: enet_host_create failed");
-		throw std::runtime_error{"Failed to start server"};
+	// 	throw std::runtime_error{"Failed to start server"};
-	}
+	// }
 
 	m_Stats = std::make_unique<CNetStatsTable>();
 	if (CProfileViewer::IsInitialised())
@@ -140,7 +511,7 @@ CNetServerWorker::CNetServerWorker(const bool continueSavedGame, std::uint16_t p
 
 	// Launch the worker thread
 	m_WorkerThread = std::thread(Threading::HandleExceptions<RunThread>::Wrapper, this,
-		std::move(initAttributes));
+		std::move(initAttributes), port);
 
 #if CONFIG2_MINIUPNPC
 	// Launch the UPnP thread
@@ -163,10 +534,6 @@ CNetServerWorker::~CNetServerWorker()
 	if (m_UPnPThread.joinable())
 		m_UPnPThread.detach();
 #endif
-
-	// Clean up resources
-	for (const auto& session : m_Sessions)
-		session->DisconnectNow(NDR_SERVER_SHUTDOWN);
 }
 
 
@@ -322,21 +689,17 @@ void CNetServerWorker::SetupUPnP(const u16 port)
 }
 #endif // CONFIG2_MINIUPNPC
 
-bool CNetServerWorker::SendMessage(ENetPeer* peer, const CNetMessage* message)
+bool CNetServerWorker::SendMessage(const CNetMessage* message)
 {
-	ENSURE(m_Host);
+	m_Sessions.front()->SendMessage(message);
 
-	CNetServerSession* session = static_cast<CNetServerSession*>(peer->data);
+	return true;
-
-	return CNetHost::SendMessage(message, peer, DebugName(session).c_str());
 }
 
 bool CNetServerWorker::Multicast(const CNetMessage* message,
 	const std::vector<NetServerSessionState>& targetStates,
 	const std::optional<std::vector<std::string>>& receivers /* = std::nullopt */)
 {
-	ENSURE(m_Host);
-
 	const auto isReceiver = [&](const CNetServerSession& session)
 		{
 			if (!PS::contains(targetStates,
@@ -361,14 +724,14 @@ bool CNetServerWorker::Multicast(const CNetMessage* message,
 	return ok;
 }
 
-void CNetServerWorker::RunThread(CNetServerWorker* data, const std::string& initAttributes)
+void CNetServerWorker::RunThread(CNetServerWorker* data, const std::string& initAttributes, u16 port)
 {
 	debug_SetThreadName("NetServer");
 
-	data->Run(initAttributes);
+	data->Run(initAttributes, port);
 }
 
-void CNetServerWorker::Run(const std::string& initAttributes)
+void CNetServerWorker::Run(const std::string& initAttributes, u16 port)
 {
 	// The script context uses the profiler and therefore the thread must be registered before the context is created
 	g_Profiler2.RegisterCurrentThread("Net server");
@@ -386,22 +749,27 @@ void CNetServerWorker::Run(const std::string& initAttributes)
 		m_InitAttributes = gameAttributesVal;
 	}
 
+	Quic quic{port};
+
 	while (true)
 	{
-		if (!RunStep())
+		if (!RunStep(quic))
 			break;
 
 		// Update profiler stats
-		m_Stats->LatchHostState(*m_Host);
+		m_Stats->LatchHostState(m_Sessions);
 	}
 
 	// Clear roots before deleting their context
 	m_SavedCommands.clear();
 
 	SAFE_DELETE(m_ScriptInterface);
+
+	for (const auto& session : m_Sessions)
+		session->Disconnect(NDR_SERVER_SHUTDOWN);
 }
 
-bool CNetServerWorker::RunStep()
+bool CNetServerWorker::RunStep(Quic& quic)
 {
 	// Check for messages from the game thread.
 	// (Do as little work as possible while the mutex is held open,
@@ -442,103 +810,40 @@ bool CNetServerWorker::RunStep()
 
 	CheckClientConnections();
 
-	// Process network events:
+	pollfd pollFd{
+		.fd{quic.m_SocketFd},
+		.events{EPOLLIN | EPOLLOUT}
+	};
+	const int ready{poll(&pollFd, 1, 25)};
 
-	ENetEvent event;
+	if (ready < 0)
-	int status = enet_host_service(m_Host.get(), &event, HOST_SERVICE_TIMEOUT);
+		throw std::runtime_error{fmt::format("epoll_wait: {}", std::strerror(errno))};
-	if (status < 0)
+
+	if (ready == 0)
 	{
-		LOGERROR("CNetServerWorker: enet_host_service failed (%d)", status);
+		for (auto& session : m_Sessions)
-		// TODO: notify game that the server has shut down
-		return false;
-	}
-
-	if (status == 0)
-	{
-		// Reached timeout with no events - try again
-		return true;
-	}
-
-	// Process the event:
-
-	switch (event.type)
-	{
-	case ENET_EVENT_TYPE_CONNECT:
-	{
-		// Report the client address
-		char hostname[256] = "(error)";
-		enet_address_get_host_ip(&event.peer->address, hostname, ARRAY_SIZE(hostname));
-		LOGMESSAGE("Net server: Received connection from %s:%u", hostname, (unsigned int)event.peer->address.port);
-
-		// Set up a session object for this peer
-
-		const std::unique_ptr<CNetServerSession>& session{m_Sessions.emplace_back(
-			std::make_unique<CNetServerSession>(*this, event.peer))};
-
-		SetupSession(session.get());
-
-		ENSURE(event.peer->data == NULL);
-		event.peer->data = session.get();
-
-		HandleConnect(session.get());
-
-		break;
-	}
-
-	case ENET_EVENT_TYPE_DISCONNECT:
-	{
-		// If there is an active session with this peer, then reset and delete it
-
-		CNetServerSession* session = static_cast<CNetServerSession*>(event.peer->data);
-		if (session)
 		{
-			LOGMESSAGE("Net server: Disconnected %s", DebugName(session).c_str());
+			ngtcp2_conn *conn = session->m_Connection.m_QuicConnection.get();
-
+			const int ret{ngtcp2_conn_handle_expiry(conn, timestamp())};
-			// Remove the session first, so we won't send player-update messages to it
+			if (ret < 0)
-			// when updating the FSM
-			const auto iter = std::ranges::find(m_Sessions, session,
-				&std::unique_ptr<CNetServerSession>::get);
-			const std::unique_ptr<CNetServerSession> _ = std::move(*iter);
-			m_Sessions.erase(iter);
-
-			session->Update((uint)NMT_CONNECTION_LOST, NULL);
-
-			event.peer->data = NULL;
-		}
-
-		if (m_State == SERVER_STATE_LOADING)
-			CheckGameLoadStatus(NULL);
-
-		break;
-	}
-
-	case ENET_EVENT_TYPE_RECEIVE:
-	{
-		// If there is an active session with this peer, then process the message
-
-		CNetServerSession* session = static_cast<CNetServerSession*>(event.peer->data);
-		if (session)
-		{
-			// Create message from raw data
-			CNetMessage* msg = CNetMessageFactory::CreateMessage(event.packet->data, event.packet->dataLength, GetScriptInterface());
-			if (msg)
 			{
-				LOGMESSAGE("Net server: Received message %s of size %lu from %s", msg->ToString().c_str(), (unsigned long)msg->GetSerializedLength(), DebugName(session).c_str());
+				LOGERROR("ngtcp2_conn_handle_expiry: %s", ngtcp2_strerror(ret));
-
+				continue;
-				HandleMessageReceive(msg, session);
-
-				delete msg;
 			}
+
+			session->m_Connection.Write(quic.m_SocketFd);
 		}
-
-		// Done using the packet
-		enet_packet_destroy(event.packet);
-
-		break;
 	}
+	else
+	{
+		if (pollFd.revents & EPOLLIN)
+			quic.HandleIncoming(*this);
 
-	case ENET_EVENT_TYPE_NONE:
+		if (pollFd.revents & EPOLLOUT)
-		break;
+		{
+			for (auto& session : m_Sessions)
+				session->m_Connection.Write(quic.m_SocketFd);
+		}
 	}
 
 	return true;
@@ -1172,9 +1477,9 @@ bool CNetServerWorker::OnSimulationCommand(CNetServerSession* session, CFsmEvent
 	server.Multicast(message, { NSS_INGAME });
 
 	// Save all the received commands
-	if (server.m_SavedCommands.size() < message->m_Turn + 1)
+	if (server.m_SavedCommands.size() < static_cast<size_t>(message->m_Turn) + 1)
-		server.m_SavedCommands.resize(message->m_Turn + 1);
+		server.m_SavedCommands.resize(static_cast<size_t>(message->m_Turn) + 1);
-	server.m_SavedCommands[message->m_Turn].push_back(*message);
+	server.m_SavedCommands[static_cast<size_t>(message->m_Turn)].push_back(*message);
 
 	// TODO: we shouldn't send the message back to the client that first sent it
 	return true;
@@ -1396,14 +1701,14 @@ bool CNetServerWorker::OnJoinSyncingLoadedGame(CNetServerSession* session, CFsmE
 
 	CLoadedGameMessage* message = (CLoadedGameMessage*)event->GetParamRef();
 
-	u32 turn = message->m_CurrentTurn;
+	turn_id_t turn = message->m_CurrentTurn;
-	u32 readyTurn = server.m_ServerTurnManager->GetReadyTurn();
+	turn_id_t readyTurn = server.m_ServerTurnManager->GetReadyTurn();
 
 	// Send them all commands received since their saved state,
 	// and turn-ended messages for any turns that have already been processed
-	for (size_t i = turn + 1; i < std::max(readyTurn+1, (u32)server.m_SavedCommands.size()); ++i)
+	for (turn_id_t i = turn + 1; i < std::max(readyTurn + 1, static_cast<turn_id_t>(server.m_SavedCommands.size())); ++i)
 	{
-		if (i < server.m_SavedCommands.size())
+		if (static_cast<size_t>(i) < server.m_SavedCommands.size())
 			for (size_t j = 0; j < server.m_SavedCommands[i].size(); ++j)
 				session->SendMessage(&server.m_SavedCommands[i][j]);
 
@@ -1640,14 +1945,12 @@ CStrW CNetServerWorker::DeduplicatePlayerName(const CStrW& original)
 		if (unique)
 			return name;
 
-		name = original + L" (" + CStrW::FromUInt(id++) + L")";
+		name = fmt::format(L"{}({})", original, id++);
 	}
 }
 
-void CNetServerWorker::SendHolePunchingMessage(const CStr& ipStr, u16 port)
+void CNetServerWorker::SendHolePunchingMessage(const CStr& /*ipStr*/, u16 /*port*/)
 {
-	if (m_Host)
-		StunClient::SendHolePunchingMessages(*m_Host, ipStr, port);
 }
 
 
@@ -1665,9 +1968,9 @@ CNetServer::CNetServer(const bool continueSavedGame, std::uint16_t port, const b
 
 	// In lobby, we send our public ip and port on request to the players who want to connect.
 	// Thus we need to know our public IP and use STUN to get it.
-	std::lock_guard<std::mutex> lock(m_Worker.m_WorkerMutex);
+	// std::lock_guard<std::mutex> lock(m_Worker.m_WorkerMutex);
-	if (!m_Worker.m_Host || !StunClient::FindPublicIP(*m_Worker.m_Host, m_PublicIp, m_PublicPort))
+	// if (!m_Worker.m_Host || !StunClient::FindPublicIP(*m_Worker.m_Host, m_PublicIp, m_PublicPort))
-		throw std::runtime_error{"Failed to resolve public IP-address."};
+	// 	throw std::runtime_error{"Failed to resolve public IP-address."};
 }
 
 bool CNetServer::UseLobbyAuth() const
@@ -1688,9 +1991,7 @@ u16 CNetServer::GetPublicPort() const
 u16 CNetServer::GetLocalPort() const
 {
 	std::lock_guard<std::mutex> lock(m_Worker.m_WorkerMutex);
-	if (!m_Worker.m_Host)
+	return 0; // m_Worker.m_Host->address.port;
-		return 0;
-	return m_Worker.m_Host->address.port;
 }
 
 bool CNetServer::CheckPasswordAndIncrement(const std::string& username, const std::string& password, const std::string& salt)
@@ -1737,3 +2038,4 @@ void CNetServer::SendHolePunchingMessage(const CStr& ip, u16 port)
 {
 	m_Worker.SendHolePunchingMessage(ip, port);
 }
+

source/network/NetServer.h

@@ -119,7 +119,7 @@ public:
 	/**
 	 * Send a message to the given network peer.
 	 */
-	bool SendMessage(ENetPeer* peer, const CNetMessage* message);
+	bool SendMessage(const CNetMessage* message);
 
 	/**
 	 * Disconnects a player from gamesetup or session.
@@ -173,10 +173,12 @@ private:
 	 */
 	CStrW DeduplicatePlayerName(const CStrW& original);
 
+public:
 	/**
 	 * Get the script context used for init attributes.
 	 */
 	const Script::Interface& GetScriptInterface();
+private:
 
 	/**
 	 * Set the turn length to a fixed value.
@@ -227,7 +229,9 @@ private:
 
 	void ConstructPlayerAssignmentMessage(CPlayerAssignmentMessage& message);
 
+public:
 	void HandleMessageReceive(CNetMessage* message, CNetServerSession* session);
+public:
 
 	/**
 	 * Send a network warning if the connection to a client is being lost or has bad latency.
@@ -263,7 +267,8 @@ private:
 	 */
 	const bool m_LobbyAuth;
 
-	std::unique_ptr<ENetHost, DestroyHost> m_Host;
+	class Quic;
+
 	std::vector<std::unique_ptr<CNetServerSession>> m_Sessions;
 
 	std::unique_ptr<CNetStatsTable> m_Stats;
@@ -330,9 +335,9 @@ private:
 	std::thread m_UPnPThread;
 #endif
 
-	static void RunThread(CNetServerWorker* data, const std::string& initAttributes);
+	static void RunThread(CNetServerWorker* data, const std::string& initAttributes, u16 port);
-	void Run(const std::string& initAttributes);
+	void Run(const std::string& initAttributes, u16 port);
-	bool RunStep();
+	bool RunStep(Quic& quic);
 
 	std::thread m_WorkerThread;
 	mutable std::mutex m_WorkerMutex;

source/network/NetServerSession.cpp

@@ -25,8 +25,312 @@
 #include "network/NetServer.h"
 #include "ps/CLogger.h"
 
-CNetServerSession::CNetServerSession(CNetServerWorker& server, ENetPeer* peer) :
+
-	m_Server(server), m_FileTransferer(*this), m_Peer(peer)
+#include <gnutls/crypto.h>
+#include <gnutls/gnutls.h>
+
+namespace
+{
+void SendPacket(const int socketFd, const std::span<const std::uint8_t> data, const ngtcp2_addr remote)
+{
+	iovec iov{
+		.iov_base{const_cast<std::uint8_t*>(data.data())},
+		.iov_len{data.size()}
+	};
+
+	msghdr msg{};
+	msg.msg_name = remote.addr;
+	msg.msg_namelen = remote.addrlen;
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+
+	ssize_t ret;
+	do
+		ret = sendmsg(socketFd, &msg, MSG_DONTWAIT);
+	while (ret < 0 && errno == EINTR);
+	if (ret < 0)
+		throw std::system_error{errno, std::generic_category(), "Error sending message"};
+}
+
+ngtcp2_conn* GetConnection(ngtcp2_crypto_conn_ref* connRef)
+{
+	return reinterpret_cast<std::unique_ptr<ngtcp2_conn, ConnectionDeleter>*>(connRef->user_data)->get();
+}
+
+int OnReceiveStreamData(ngtcp2_conn* conn, const std::uint32_t /*flags*/, const std::int64_t streamId,
+	const std::uint64_t /*offset*/, const std::uint8_t* data, const std::size_t datalen, void* userData,
+	void* /*streamUserData*/)
+{
+	CNetServerSession& session{*static_cast<CNetServerSession*>(userData)};
+	const auto messageData = session.m_Connection.m_Stream.value().Receive({data, datalen});
+	if (messageData.has_value())
+	{
+		std::unique_ptr<CNetMessage> message{CNetMessageFactory::CreateMessage(messageData.value(),
+			session.GetServer().GetScriptInterface())};
+		session.GetServer().HandleMessageReceive(message.get(), &session);
+	}
+	increaseWindow(conn, streamId, datalen);
+	return 0;
+}
+
+int OnAcknowledgedStreamData(ngtcp2_conn*, const std::int64_t, const std::uint64_t offset,
+	const std::uint64_t dataLength, void* userData, void*)
+{
+	Connection& connection{static_cast<CNetServerSession*>(userData)->m_Connection};
+	Stream& stream{connection.GetStream()};
+	stream.MarkAcknowledged(offset + dataLength);
+	return 0;
+}
+
+int OnConnect(ngtcp2_conn*, const ngtcp2_encryption_level level, void* userData)
+{
+	if (level != NGTCP2_ENCRYPTION_LEVEL_1RTT)
+		return 0;
+	Connection& connection{static_cast<CNetServerSession*>(userData)->m_Connection};
+	try
+	{
+		connection.OpenStream();
+	}
+	catch (const std::runtime_error&)
+	{
+		return NGTCP2_ERR_CALLBACK_FAILURE;
+	}
+
+	const CSrvHandshakeMessage handshake(CreateHandshake<CSrvHandshakeMessage>());
+	connection.GetStream().PushMessage(&handshake);
+	return 0;
+}
+
+constexpr ngtcp2_callbacks callbacks{
+	.recv_client_initial{&ngtcp2_crypto_recv_client_initial_cb},
+	.recv_crypto_data{&ngtcp2_crypto_recv_crypto_data_cb},
+	.encrypt{&ngtcp2_crypto_encrypt_cb},
+	.decrypt{&ngtcp2_crypto_decrypt_cb},
+	.hp_mask{&ngtcp2_crypto_hp_mask_cb},
+	.recv_stream_data{&OnReceiveStreamData},
+	.acked_stream_data_offset{&OnAcknowledgedStreamData},
+	.recv_retry{&ngtcp2_crypto_recv_retry_cb},
+	.rand{&OnRandomRequest},
+	.get_new_connection_id{&OnNewConnectionIdRequest},
+	.update_key{&ngtcp2_crypto_update_key_cb},
+	.delete_crypto_aead_ctx{&ngtcp2_crypto_delete_crypto_aead_ctx_cb},
+	.delete_crypto_cipher_ctx{&ngtcp2_crypto_delete_crypto_cipher_ctx_cb},
+	.get_path_challenge_data{&ngtcp2_crypto_get_path_challenge_data_cb},
+	.recv_tx_key{&OnConnect}
+};
+
+void WriteToStream(const int socketFd, ngtcp2_conn* conn, Stream* stream, const ngtcp2_addr remote)
+{
+	std::array<std::uint8_t, MAX_UDP_PAYLOAD_SIZE> buf;
+
+	ngtcp2_path_storage ps;
+	ngtcp2_path_storage_zero(&ps);
+
+	ngtcp2_pkt_info pi;
+	const std::uint64_t ts{timestamp()};
+
+	std::uint32_t flags{NGTCP2_WRITE_STREAM_FLAG_MORE};
+
+	while (true)
+	{
+		ngtcp2_vec datav;
+		std::int64_t stream_id;
+
+		if (stream)
+		{
+			auto bytesToSend = stream->PeekData();
+			if (bytesToSend.has_value())
+			{
+				datav.base = const_cast<uint8_t*>(bytesToSend->data());
+				datav.len = bytesToSend->size();
+				stream_id = stream->m_Id;
+			}
+			else
+			{
+				/* No stream data to be sent */
+				datav.base = nullptr;
+				datav.len = 0;
+				stream_id = -1;
+				flags &= ~NGTCP2_WRITE_STREAM_FLAG_MORE;
+			}
+		}
+		else
+		{
+			datav.base = NULL;
+			datav.len = 0;
+			stream_id = -1;
+		}
+
+		ngtcp2_ssize n_read;
+		const ngtcp2_ssize n_written{ngtcp2_conn_writev_stream(conn, &ps.path, &pi, buf.data(),
+			buf.size(), &n_read, flags, stream_id, &datav, 1, ts)};
+		if (n_written < 0)
+		{
+			if (n_written != NGTCP2_ERR_WRITE_MORE)
+			{
+				throw std::runtime_error{fmt::format("ngtcp2_conn_writev_stream: {}",
+					ngtcp2_strerror(static_cast<int>(n_written)))};
+			}
+			if (stream && n_read > 0)
+				stream->MarkSent(n_read);
+			continue;
+		}
+
+		if (n_written == 0)
+			break;
+
+		if (stream && n_read > 0)
+			stream->MarkSent(n_read);
+
+		try
+		{
+			SendPacket(socketFd, {buf.data(), static_cast<std::size_t>(n_written)}, remote);
+		}
+		catch (std::system_error& e)
+		{
+			if (e.code().value() == EAGAIN || e.code().value() == EWOULDBLOCK)
+				break;
+			throw;
+		}
+
+		/* No stream data to be sent */
+		if (stream && datav.len == 0)
+			break;
+	}
+	ngtcp2_conn_update_pkt_tx_time(conn, timestamp());
+}
+
+std::unique_ptr<gnutls_session_int, SessionDeleter> createTlsSession(
+	const gnutls_certificate_credentials_t cred)
+{
+	gnutls_session_t tempSession;
+	if (const int ret{gnutls_init(&tempSession, GNUTLS_SERVER | GNUTLS_ENABLE_EARLY_DATA |
+		GNUTLS_NO_END_OF_EARLY_DATA)})
+	{
+		throw std::runtime_error{fmt::format("gnutls_init: {}", gnutls_strerror(ret))};
+	}
+	std::unique_ptr<gnutls_session_int, SessionDeleter> session{tempSession};
+
+	if (const int ret{gnutls_priority_set_direct(session.get(), TLS_PRIORITY, NULL)})
+		throw std::runtime_error{fmt::format("gnutls_priority_set_direct: {}", gnutls_strerror(ret))};
+
+	if (const int ret{gnutls_credentials_set(session.get(), GNUTLS_CRD_CERTIFICATE, cred)})
+		throw std::runtime_error{fmt::format("gnutls_credentials_set: {}", gnutls_strerror(ret))};
+
+	return session;
+}
+}
+
+Connection::Connection(CNetServerSession& session, const ngtcp2_settings& settings,
+	gnutls_certificate_credentials_t credentials, const ngtcp2_pkt_hd& header,
+	const ngtcp2_cid& newScid, const ngtcp2_path& path):
+	m_TlsSession{createTlsSession(credentials)},
+	m_ConnRef{
+		.get_conn{&GetConnection},
+		.user_data{&m_QuicConnection}
+	}
+{
+	ngtcp2_transport_params params;
+	ngtcp2_transport_params_default(&params);
+	params.initial_max_stream_data_bidi_local = 128 * KiB;
+	params.initial_max_data = 1 * MiB;
+	params.max_udp_payload_size = MAX_UDP_PAYLOAD_SIZE;
+	ngtcp2_cid_init(&params.original_dcid, header.dcid.data, header.dcid.datalen);
+	params.original_dcid_present = true;
+	params.grease_quic_bit = 1;
+
+	ngtcp2_conn* tempConn;
+	if (const int ret = ngtcp2_conn_server_new(&tempConn, &header.scid, &newScid, &path, header.version,
+		&callbacks, &settings, &params, nullptr, &session))
+	{
+		throw std::runtime_error{fmt::format("ngtcp2_conn_server_new: {}",
+			ngtcp2_strerror (ret))};
+	}
+
+	m_QuicConnection.reset(tempConn);
+
+	memcpy(&m_LocalAddress, path.local.addr, path.local.addrlen);
+	m_LocalAddressLength = path.local.addrlen;
+	memcpy(&m_RemoteAddress, path.remote.addr, path.remote.addrlen);
+	m_RemoteAddressLength = path.remote.addrlen;
+
+	ngtcp2_crypto_gnutls_configure_server_session(m_TlsSession.get());
+	ngtcp2_conn_set_tls_native_handle(m_QuicConnection.get(), m_TlsSession.get());
+	gnutls_session_set_ptr(m_TlsSession.get(), &m_ConnRef);
+	m_TimerFd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
+	if (m_TimerFd < 0)
+		throw std::system_error(errno, std::generic_category(), "timerfd_create");
+}
+
+void Connection::OpenStream()
+{
+	std::int64_t streamId;
+	if (ngtcp2_conn_open_bidi_stream(m_QuicConnection.get(), &streamId, nullptr))
+		throw std::runtime_error{""};
+	m_Stream.emplace(streamId);
+}
+
+Stream& Connection::GetStream()
+{
+	return m_Stream.value();
+}
+
+void Connection::Read(const ngtcp2_addr remote, const std::span<std::uint8_t> data)
+{
+	const ngtcp2_path path{
+		.local{ngtcp2_conn_get_path(m_QuicConnection.get())->local},
+		.remote{remote}
+	};
+
+	ngtcp2_pkt_info pi{};
+	if (const int ret{ngtcp2_conn_read_pkt(m_QuicConnection.get(), &path, &pi, data.data(), data.size(),
+		timestamp())})
+	{
+		throw std::runtime_error{"Destroy connection"};
+	}
+}
+
+void Connection::Write(const int socketFd)
+{
+	WriteToStream(socketFd, m_QuicConnection.get(), nullptr,
+		{&m_RemoteAddress.sa, m_RemoteAddressLength});
+
+	if (m_Stream.has_value())
+	{
+		WriteToStream(socketFd, m_QuicConnection.get(), &m_Stream.value(),
+			{&m_RemoteAddress.sa, m_RemoteAddressLength});
+	}
+
+	const ngtcp2_tstamp expiry{ngtcp2_conn_get_expiry(m_QuicConnection.get())};
+	const ngtcp2_tstamp now{timestamp()};
+	itimerspec it{};
+
+	if (const int ret{timerfd_settime(m_TimerFd, 0, &it, nullptr)})
+		throw std::system_error{errno, std::generic_category(), "timerfd_settime"};
+	if (expiry < now)
+	{
+		it.it_value.tv_sec = 0;
+		it.it_value.tv_nsec = 1;
+	}
+	else
+	{
+		it.it_value.tv_sec = (expiry - now) / NGTCP2_SECONDS;
+		it.it_value.tv_nsec = ((expiry - now) % NGTCP2_SECONDS) / NGTCP2_NANOSECONDS;
+	}
+
+	if (const int ret{timerfd_settime(m_TimerFd, 0, &it, nullptr)})
+		throw std::system_error{errno, std::generic_category(), "timerfd_settime"};
+
+	return;
+}
+
+CNetServerSession::CNetServerSession(CNetServerWorker& server, const int socketFd,
+	const ngtcp2_settings& settings, gnutls_certificate_credentials_t credentials,
+	const ngtcp2_pkt_hd& header, const ngtcp2_cid& newScid, const ngtcp2_path& path) :
+	m_Server(server),
+	m_Connection{*this, settings, credentials, header, newScid, path},
+	m_FileTransferer(*this),
+	m_SocketFd{socketFd}
 {
 }
 
@@ -58,18 +362,30 @@ void CNetServerSession::Disconnect(NetDisconnectReason reason)
 
 	Update((uint)NMT_CONNECTION_LOST, NULL);
 
-	enet_peer_disconnect(m_Peer, static_cast<enet_uint32>(reason));
+	const ngtcp2_ccerr quicReason{
-}
+		.type{NGTCP2_CCERR_TYPE_APPLICATION},
+		.error_code{reason}
+	};
 
-void CNetServerSession::DisconnectNow(NetDisconnectReason reason)
+	ngtcp2_sockaddr_union local;
-{
+	ngtcp2_sockaddr_union remote;
-	if (reason == NDR_UNKNOWN)
+	ngtcp2_path path{
-		LOGWARNING("Disconnecting client without communicating the disconnect reason!");
+		.local{.addr{&local.sa}},
+		.remote{.addr{&remote.sa}}
+	};
+	std::array<std::uint8_t, MAX_UDP_PAYLOAD_SIZE> buffer;
+	const ngtcp2_ssize amount{ngtcp2_conn_write_connection_close(m_Connection.m_QuicConnection.get(), &path, nullptr, buffer.data(),
+		buffer.size(), &quicReason, timestamp())};
+	if (amount <= 0)
+		LOGERROR("closing connection %s", ngtcp2_strerror(static_cast<int>(amount)));
 
-	enet_peer_disconnect_now(m_Peer, static_cast<enet_uint32>(reason));
+	SendPacket(m_SocketFd, {buffer.data(), static_cast<std::size_t>(amount)}, path.remote);
 }
 
 bool CNetServerSession::SendMessage(const CNetMessage* message)
 {
-	return m_Server.SendMessage(m_Peer, message);
+	m_Connection.m_Stream.value().PushMessage(message);
+	return true;
 }
+
+

source/network/NetServerSession.h

@@ -23,10 +23,51 @@
 #include "network/NetHost.h"
 #include "ps/CStr.h"
 
+#include <deque>
+#include <ngtcp2/ngtcp2.h>
+#include <ngtcp2/ngtcp2_crypto.h>
+#include <ngtcp2/ngtcp2_crypto_gnutls.h>
+#include <optional>
+#include <span>
+
+#include <sys/timerfd.h>
+#include <sys/epoll.h>
+#include <sys/socket.h>
+#include <sys/timerfd.h>
+
+#include "network/NetProtocol.h"
+#include "ps/CLogger.h"
+
 class CNetServerWorker;
 
 typedef struct _ENetPeer ENetPeer;
 
+class CNetServerSession;
+class Connection
+{
+public:
+	Connection(CNetServerSession& session, const ngtcp2_settings& settings,
+		gnutls_certificate_credentials_t credentials, const ngtcp2_pkt_hd& header,
+		const ngtcp2_cid& scid, const ngtcp2_path& path);
+
+	void OpenStream();
+	Stream& GetStream();
+
+	void Read(const ngtcp2_addr remote, const std::span<std::uint8_t> data);
+	void Write(const int socketFd);
+
+	std::unique_ptr<gnutls_session_int, SessionDeleter> m_TlsSession;
+	std::unique_ptr<ngtcp2_conn, ConnectionDeleter> m_QuicConnection;
+	int m_TimerFd{-1};
+public:
+	ngtcp2_sockaddr_union m_LocalAddress;
+	ngtcp2_socklen m_LocalAddressLength;
+	ngtcp2_sockaddr_union m_RemoteAddress;
+	ngtcp2_socklen m_RemoteAddressLength;
+	std::optional<Stream> m_Stream;
+	ngtcp2_crypto_conn_ref m_ConnRef;
+};
+
 /**
  * The server's end of a network session.
  * Represents an abstraction of the state of the client, storing all the per-client data
@@ -40,7 +81,9 @@ class CNetServerSession : public CFsm<CNetServerSession, CNetMessage*>
 	NONCOPYABLE(CNetServerSession);
 
 public:
-	CNetServerSession(CNetServerWorker& server, ENetPeer* peer);
+	CNetServerSession(CNetServerWorker& server, const int socketFd, const ngtcp2_settings& settings,
+		gnutls_certificate_credentials_t credentials, const ngtcp2_pkt_hd& header,
+		const ngtcp2_cid& newScid, const ngtcp2_path& path);
 
 	CNetServerWorker& GetServer() { return m_Server; }
 
@@ -73,13 +116,6 @@ public:
 	 */
 	void Disconnect(NetDisconnectReason reason);
 
-	/**
-	 * Sends an unreliable disconnection notification to the client.
-	 * The server will not receive any disconnection notification.
-	 * The server will not receive any further messages sent via this session.
-	 */
-	void DisconnectNow(NetDisconnectReason reason);
-
 	/**
 	 * Send a message to the client.
 	 */
@@ -89,7 +125,10 @@ public:
 
 private:
 	CNetServerWorker& m_Server;
+public:
+	Connection m_Connection;
 
+private:
 	CNetFileTransferer m_FileTransferer;
 
 	ENetPeer* m_Peer;
@@ -98,6 +137,7 @@ private:
 	CStrW m_UserName;
 	u32 m_HostID{0};
 	CStr m_Password;
+	int m_SocketFd;
 };
 
 #endif // NET_SERVER_SESSION_H

source/network/NetServerTurnManager.cpp

@@ -27,6 +27,7 @@
 #include "network/NetServerSession.h"
 #include "ps/CLogger.h"
 #include "ps/ConfigDB.h"
+#include "simulation2/helpers/SimulationCommand.h"
 #include "simulation2/system/TurnManager.h"
 
 #include <limits>
@@ -50,7 +51,7 @@ CNetServerTurnManager::CNetServerTurnManager(CNetServerWorker& server)
 		m_SavedTurnLengths.push_back(m_TurnLength);
 }
 
-void CNetServerTurnManager::NotifyFinishedClientCommands(CNetServerSession& session, u32 turn)
+void CNetServerTurnManager::NotifyFinishedClientCommands(CNetServerSession& session, turn_id_t turn)
 {
 	int client = session.GetHostID();
 
@@ -105,11 +106,11 @@ void CNetServerTurnManager::CheckClientsReady()
 	msg.m_Turn = m_ReadyTurn;
 	m_NetServer.Multicast(&msg, { NSS_INGAME });
 
-	ENSURE(m_SavedTurnLengths.size() == m_ReadyTurn);
+	ENSURE(std::cmp_equal(m_SavedTurnLengths.size(), m_ReadyTurn));
 	m_SavedTurnLengths.push_back(m_TurnLength);
 }
 
-void CNetServerTurnManager::NotifyFinishedClientUpdate(CNetServerSession& session, u32 turn, const CStr& hash)
+void CNetServerTurnManager::NotifyFinishedClientUpdate(CNetServerSession& session, turn_id_t turn, const CStr& hash)
 {
 
 	int client = session.GetHostID();
@@ -138,13 +139,13 @@ void CNetServerTurnManager::NotifyFinishedClientUpdate(CNetServerSession& sessio
 	m_ClientStateHashes[turn][client] = hash;
 
 	// Find the newest turn which we know all clients have simulated
-	u32 newest = std::numeric_limits<u32>::max();
+	turn_id_t newest = std::numeric_limits<turn_id_t>::max();
 	for (const std::pair<const int, Client>& clientData : m_ClientsData)
 		if (clientData.second.simulatedTurn < newest)
 			newest = clientData.second.simulatedTurn;
 
 	// For every set of state hashes that all clients have simulated, check for OOS
-	for (const std::pair<const u32, std::map<int, std::string>>& clientStateHash : m_ClientStateHashes)
+	for (const std::pair<const turn_id_t, std::map<int, std::string>>& clientStateHash : m_ClientStateHashes)
 	{
 		if (clientStateHash.first > newest)
 			break;
@@ -187,7 +188,7 @@ void CNetServerTurnManager::NotifyFinishedClientUpdate(CNetServerSession& sessio
 	m_ClientStateHashes.erase(m_ClientStateHashes.begin(), m_ClientStateHashes.lower_bound(newest+1));
 }
 
-void CNetServerTurnManager::InitialiseClient(int client, u32 turn, bool observer)
+void CNetServerTurnManager::InitialiseClient(int client, turn_id_t turn, bool observer)
 {
 	NETSERVERTURN_LOG("InitialiseClient(client=%d, turn=%d)\n", client, turn);
 
@@ -206,7 +207,7 @@ void CNetServerTurnManager::UninitialiseClient(int client)
 	bool checkOOS = m_ClientsData[client].isOOS;
 	m_ClientsData.erase(client);
 
-	for (std::pair<const u32, std::map<int, std::string>>& clientStateHash : m_ClientStateHashes)
+	for (std::pair<const turn_id_t, std::map<int, std::string>>& clientStateHash : m_ClientStateHashes)
 		clientStateHash.second.erase(client);
 
 	// Check whether we're ready for the next turn now that we're not
@@ -228,8 +229,8 @@ void CNetServerTurnManager::SetTurnLength(u32 msecs)
 	m_TurnLength = msecs;
 }
 
-u32 CNetServerTurnManager::GetSavedTurnLength(u32 turn)
+u32 CNetServerTurnManager::GetSavedTurnLength(turn_id_t turn)
 {
 	ENSURE(turn <= m_ReadyTurn);
-	return m_SavedTurnLengths.at(turn);
+	return m_SavedTurnLengths.at(static_cast<size_t>(turn));
 }