0ad/source/graphics/CinemaManager.cpp

/* 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
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * 0 A.D. is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "precompiled.h"

#include "CinemaManager.h"

#include "graphics/Color.h"
#include "graphics/GameView.h"
#include "graphics/Terrain.h"
#include "maths/FixedVector3D.h"
#include "maths/NUSpline.h"
#include "maths/Vector3D.h"
#include "ps/CStr.h"
#include "ps/Game.h"
#include "ps/World.h"
#include "renderer/DebugRenderer.h"
#include "renderer/Renderer.h"
#include "renderer/RenderingOptions.h"
#include "simulation2/Simulation2.h"
#include "simulation2/components/ICmpCinemaManager.h"
#include "simulation2/helpers/CinemaPath.h"
#include "simulation2/system/Component.h"

#include <map>
#include <utility>
#include <vector>

void CCinemaManager::Update(const float deltaRealTime)
{
	CmpPtr<ICmpCinemaManager> cmpCinemaManager(g_Game->GetSimulation2()->GetSimContext().GetSystemEntity());
	if (!cmpCinemaManager)
		return;

	if (IsPlaying())
	{
		if (g_RenderingOptions.GetSmoothLOS())
		{
			g_RenderingOptions.SetSmoothLOS(false);
			m_SmoothLosOverridden = true;
		}
		cmpCinemaManager->UpdateActivePath(deltaRealTime, g_Game->GetView()->GetCamera());
		return;
	}

	if (std::exchange(m_SmoothLosOverridden, false))
		g_RenderingOptions.SetSmoothLOS(true);
}

void CCinemaManager::Render(Renderer::Backend::IDeviceCommandContext& deviceCommandContext) const
{
	if (!IsPlaying() && m_DrawPaths)
		DrawPaths(deviceCommandContext);
}

void CCinemaManager::DrawPaths(Renderer::Backend::IDeviceCommandContext& deviceCommandContext) const
{
	CmpPtr<ICmpCinemaManager> cmpCinemaManager(g_Game->GetSimulation2()->GetSimContext().GetSystemEntity());
	if (!cmpCinemaManager)
		return;

	for (const std::pair<const CStrW, CCinemaPath>& p : cmpCinemaManager->GetPaths())
	{
		DrawSpline(deviceCommandContext, p.second, CColor(0.2f, 0.2f, 1.f, 0.9f), 128);
		DrawNodes(deviceCommandContext, p.second, CColor(0.1f, 1.f, 0.f, 1.f));

		if (p.second.GetTargetSpline().GetAllNodes().empty())
			continue;

		DrawSpline(deviceCommandContext, p.second.GetTargetSpline(), CColor(1.f, 0.3f, 0.4f, 0.9f), 128);
		DrawNodes(deviceCommandContext, p.second.GetTargetSpline(), CColor(1.f, 0.1f, 0.f, 1.f));
	}
}

void CCinemaManager::DrawSpline(Renderer::Backend::IDeviceCommandContext& deviceCommandContext, const RNSpline& spline, const CColor& splineColor, int smoothness) const
{
	if (spline.GetAllNodes().size() < 2)
		return;
	if (spline.GetAllNodes().size() == 2)
		smoothness = 2;

	const float start = spline.MaxDistance.ToFloat() / smoothness;

	std::vector<CVector3D> line;
	for (int i = 0; i <= smoothness; ++i)
	{
		const float time = start * i / spline.MaxDistance.ToFloat();
		line.emplace_back(spline.GetPosition(time));
	}

	g_Renderer.GetDebugRenderer().DrawLine(deviceCommandContext, line, splineColor, 0.2f, false);

	// Height indicator
	if (g_Game && g_Game->GetWorld())
	{
		for (int i = 0; i <= smoothness; ++i)
		{
			const float time = start * i / spline.MaxDistance.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);
		}
	}
}

void CCinemaManager::DrawNodes(Renderer::Backend::IDeviceCommandContext& deviceCommandContext, const RNSpline& spline, const CColor& nodeColor) const
{
	for (const SplineData& node : spline.GetAllNodes())
	{
		g_Renderer.GetDebugRenderer().DrawCircle(
			deviceCommandContext,
			CVector3D(node.Position.X.ToFloat(), node.Position.Y.ToFloat(), node.Position.Z.ToFloat()),
			0.5f, nodeColor);
	}
}

bool CCinemaManager::IsPlaying() const
{
	CmpPtr<ICmpCinemaManager> cmpCinemaManager(g_Game->GetSimulation2()->GetSimContext().GetSystemEntity());
	return cmpCinemaManager && cmpCinemaManager->IsPlayingQueue();
}

bool CCinemaManager::GetPathsDrawing() const
{
	return m_DrawPaths;
}

void CCinemaManager::SetPathsDrawing(const bool drawPath)
{
	m_DrawPaths = drawPath;
}