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First, do a ray intersection test with the bounding-sphere for all entities on the map and then check the more detailed selection shape for the remaining candidates. Do checks that require component lookups after the ray intersection tests because these are relatively expensive. The old method for figuring out which entities are below the mouse cursor was incorrect because it does a 2D check to filter out the first candidates which can lead to incorrect results with lower camera angles and high buildings or buildings with a large footprint. Such problems were avoided with quite a large radius for this 2D test and resulted in a large number of candiate entities after this first test (200-500). Also rename PickEntitiesAtPoint to PickEntityAtPoint and make it return only one (the closest) match. I've tested performance with the tracelogger by starting a map and then moving the mouse in circles for one minute. The results were relatively stable. I've compared the total time percentage of input.js:836, which spends nearly all of the time in PickEntityAtPoint. Ardennes Forest - Normal size: Original: 41.46% Patched: 31.6% Ardennes Forest - Giant size: Original: 40.59% Patched: 51.55% As we see, it's faster on normal map sizes but slower on giant maps with a lot of entities. This approach can be further improved with some kind of spatial subdivision for the culling (like an octree), which would help the unit renderer too. This way it should be possible to make it faster (and still correct) on all map sizes and with a large total numbers of entities. This was SVN commit r16098.
92 lines
3.9 KiB
C++
92 lines
3.9 KiB
C++
/* Copyright (C) 2012 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef INCLUDED_SELECTION
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#define INCLUDED_SELECTION
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/**
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* @file
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* Helper functions related to entity selection
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*/
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#include "simulation2/system/Entity.h"
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#include "Player.h"
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#include <vector>
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class CSimulation2;
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class CCamera;
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namespace EntitySelection
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{
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/**
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* Finds all selectable entities under the given screen coordinates.
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*
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* @param camera use this view to convert screen to world coordinates.
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* @param screenX,screenY 2D screen coordinates.
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* @param player player whose LOS will be used when selecting entities. In Atlas
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* this value is ignored as the whole map is revealed.
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* @param allowEditorSelectables if true, all entities with the ICmpSelectable interface
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* will be selected (including decorative actors), else only those selectable ingame.
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* @param range Approximate range to check for entity in.
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*
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* @return ordered list of selected entities with the closest first.
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*/
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entity_id_t PickEntityAtPoint(CSimulation2& simulation, const CCamera& camera, int screenX, int screenY, player_id_t player, bool allowEditorSelectables);
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/**
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* Finds all selectable entities within the given screen coordinate rectangle,
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* belonging to the given player. Used for bandboxing.
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*
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* @param camera use this view to convert screen to world coordinates.
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* @param sx0,sy0,sx1,sy1 diagonally opposite corners of the rectangle in 2D screen coordinates.
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* @param owner player whose entities we are selecting. Ownership is ignored if
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* INVALID_PLAYER is used.
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* @param allowEditorSelectables if true, all entities with the ICmpSelectable interface
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* will be selected (including decorative actors), else only those selectable ingame.
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*
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* @return unordered list of selected entities.
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*/
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std::vector<entity_id_t> PickEntitiesInRect(CSimulation2& simulation, const CCamera& camera, int sx0, int sy0, int sx1, int sy1, player_id_t owner, bool allowEditorSelectables);
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/**
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* Finds all entities with the given entity template name, belonging to the given player.
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*
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* @param camera use this view to convert screen to world coordinates.
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* @param templateName the name of the template to match, or the selection group name
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* for similar matching.
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* @param owner player whose entities we are selecting. Ownership is ignored if
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* INVALID_PLAYER is used.
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* @param includeOffScreen if true, then all entities visible in the world will be selected,
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* else only entities visible to the camera will be selected.
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* @param matchRank if true, only entities that exactly match templateName will be selected,
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* else entities with matching SelectionGroupName will be selected.
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* @param allowEditorSelectables if true, all entities with the ICmpSelectable interface
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* will be selected (including decorative actors), else only those selectable in-game.
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* @param allowFoundations if true, foundations are also included in the results. Only takes
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* effect when matchRank = true.
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*
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* @return unordered list of selected entities.
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* @see ICmpIdentity
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*/
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std::vector<entity_id_t> PickSimilarEntities(CSimulation2& simulation, const CCamera& camera, const std::string& templateName,
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player_id_t owner, bool includeOffScreen, bool matchRank, bool allowEditorSelectables, bool allowFoundations);
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} // namespace
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#endif // INCLUDED_SELECTION
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