Sdk/RenderSystem: Allow to change render technique

Former-commit-id: ec61a2ebff138300344e6068917f0863c3d11859

SDK/include/NDK/Systems/RenderSystem.hpp

@@ -8,7 +8,7 @@
 #define NDK_SYSTEMS_RENDERSYSTEM_HPP
 
 #include <Nazara/Graphics/AbstractBackground.hpp>
-#include <Nazara/Graphics/ForwardRenderTechnique.hpp>
+#include <Nazara/Graphics/DeferredRenderTechnique.hpp>
 #include <NDK/EntityList.hpp>
 #include <NDK/System.hpp>
 #include <unordered_map>
@@ -25,11 +25,15 @@ namespace Ndk
 			inline RenderSystem(const RenderSystem& renderSystem);
 			~RenderSystem() = default;
 
+			template<typename T> void ChangeRenderTechnique();
+			inline void ChangeRenderTechnique(std::unique_ptr<Nz::AbstractRenderTechnique>&& renderTechnique);
+
 			inline const Nz::BackgroundRef& GetDefaultBackground() const;
 			inline const Nz::Matrix4f& GetCoordinateSystemMatrix() const;
 			inline Nz::Vector3f GetGlobalForward() const;
 			inline Nz::Vector3f GetGlobalRight() const;
 			inline Nz::Vector3f GetGlobalUp() const;
+			inline Nz::AbstractRenderTechnique& GetRenderTechnique() const;
 
 			inline void SetDefaultBackground(Nz::BackgroundRef background);
 			inline void SetGlobalForward(const Nz::Vector3f& direction);
@@ -45,11 +49,11 @@ namespace Ndk
 			void OnEntityValidation(Entity* entity, bool justAdded) override;
 			void OnUpdate(float elapsedTime) override;
 
+			std::unique_ptr<Nz::AbstractRenderTechnique> m_renderTechnique;
 			EntityList m_cameras;
 			EntityList m_drawables;
 			EntityList m_lights;
 			Nz::BackgroundRef m_background;
-			Nz::ForwardRenderTechnique m_renderTechnique;
 			Nz::Matrix4f m_coordinateSystemMatrix;
 			bool m_coordinateSystemInvalidated;
 	};

SDK/include/NDK/Systems/RenderSystem.inl

@@ -9,6 +9,17 @@ namespace Ndk
 	{
 	}
 
+	template<typename T>
+	inline void RenderSystem::ChangeRenderTechnique()
+	{
+		ChangeRenderTechnique(std::make_unique<T>());
+	}
+
+	inline void RenderSystem::ChangeRenderTechnique(std::unique_ptr<Nz::AbstractRenderTechnique>&& renderTechnique)
+	{
+		m_renderTechnique = std::move(renderTechnique);
+	}
+
 	inline const Nz::BackgroundRef& RenderSystem::GetDefaultBackground() const
 	{
 		return m_background;
@@ -34,6 +45,11 @@ namespace Ndk
 		return Nz::Vector3f(m_coordinateSystemMatrix.m12, m_coordinateSystemMatrix.m22, m_coordinateSystemMatrix.m32);
 	}
 
+	inline Nz::AbstractRenderTechnique& RenderSystem::GetRenderTechnique() const
+	{
+		return *m_renderTechnique.get();
+	}
+
 	inline void RenderSystem::SetDefaultBackground(Nz::BackgroundRef background)
 	{
 		m_background = std::move(background);

SDK/src/NDK/Systems/RenderSystem.cpp

@@ -15,6 +15,7 @@ namespace Ndk
 	m_coordinateSystemMatrix(Nz::Matrix4f::Identity()),
 	m_coordinateSystemInvalidated(true)
 	{
+		ChangeRenderTechnique<Nz::ForwardRenderTechnique>();
 		SetDefaultBackground(Nz::ColorBackground::New());
 		SetUpdateRate(0.f);
 	}
@@ -73,7 +74,7 @@ namespace Ndk
 			CameraComponent& camComponent = camera->GetComponent<CameraComponent>();
 			camComponent.ApplyView();
 
-			Nz::AbstractRenderQueue* renderQueue = m_renderTechnique.GetRenderQueue();
+			Nz::AbstractRenderQueue* renderQueue = m_renderTechnique->GetRenderQueue();
 			renderQueue->Clear();
 
 			//TODO: Culling
@@ -99,7 +100,8 @@ namespace Ndk
 			sceneData.background = m_background;
 			sceneData.viewer = &camComponent;
 
-			m_renderTechnique.Draw(sceneData);
+			m_renderTechnique->Clear(sceneData);
+			m_renderTechnique->Draw(sceneData);
 		}
 	}
 

include/Nazara/Graphics/AbstractRenderTechnique.hpp

@@ -28,6 +28,7 @@ namespace Nz
 			AbstractRenderTechnique(AbstractRenderTechnique&&) = default;
 			virtual ~AbstractRenderTechnique();
 
+			virtual void Clear(const SceneData& sceneData) const = 0;
 			virtual bool Draw(const SceneData& sceneData) const = 0;
 
 			virtual void EnableInstancing(bool instancing);

include/Nazara/Graphics/DeferredRenderTechnique.hpp

@@ -32,6 +32,7 @@ namespace Nz
 			DeferredRenderTechnique();
 			~DeferredRenderTechnique();
 
+			void Clear(const SceneData& sceneData) const override;
 			bool Draw(const SceneData& sceneData) const override;
 
 			void EnablePass(RenderPassType renderPass, int position, bool enable);

include/Nazara/Graphics/ForwardRenderTechnique.hpp

@@ -24,6 +24,7 @@ namespace Nz
 			ForwardRenderTechnique();
 			~ForwardRenderTechnique() = default;
 
+			void Clear(const SceneData& sceneData) const override;
 			bool Draw(const SceneData& sceneData) const override;
 
 			unsigned int GetMaxLightPassPerObject() const;

src/Nazara/Graphics/DeferredRenderTechnique.cpp

@@ -204,6 +204,11 @@ namespace Nz
 
 	DeferredRenderTechnique::~DeferredRenderTechnique() = default;
 
+	void DeferredRenderTechnique::Clear(const SceneData& sceneData) const
+	{
+		NazaraUnused(sceneData);
+	}
+
 	bool DeferredRenderTechnique::Draw(const SceneData& sceneData) const
 	{
 		NazaraAssert(sceneData.viewer, "Invalid viewer");

src/Nazara/Graphics/ForwardRenderTechnique.cpp

@@ -49,18 +49,21 @@ namespace Nz
 		m_spriteBuffer.Reset(VertexDeclaration::Get(VertexLayout_XYZ_Color_UV), &m_vertexBuffer);
 	}
 
-	bool ForwardRenderTechnique::Draw(const SceneData& sceneData) const
+	void ForwardRenderTechnique::Clear(const SceneData& sceneData) const
 	{
-		NazaraAssert(sceneData.viewer, "Invalid viewer");
-
-		m_renderQueue.Sort(sceneData.viewer);
-
 		Renderer::Enable(RendererParameter_DepthBuffer, true);
 		Renderer::Enable(RendererParameter_DepthWrite, true);
 		Renderer::Clear(RendererBuffer_Depth);
 
 		if (sceneData.background)
 			sceneData.background->Draw(sceneData.viewer);
+	}
+
+	bool ForwardRenderTechnique::Draw(const SceneData& sceneData) const
+	{
+		NazaraAssert(sceneData.viewer, "Invalid viewer");
+
+		m_renderQueue.Sort(sceneData.viewer);
 
 		for (auto& pair : m_renderQueue.layers)
 		{