Graphics/Shadows: Add directional shadow mapping (WIP)

It still needs some debug


Former-commit-id: 029872debc1a784712a33802ddd70a2b61e55623

SDK/include/NDK/Systems/RenderSystem.hpp

@@ -37,11 +37,14 @@ namespace Ndk
 			void OnEntityRemoved(Entity* entity) override;
 			void OnEntityValidation(Entity* entity, bool justAdded) override;
 			void OnUpdate(float elapsedTime) override;
-			void UpdateShadowMaps();
+			void UpdateDirectionalShadowMaps(const NzAbstractViewer& viewer);
+			void UpdatePointSpotShadowMaps();
 
 			EntityList m_cameras;
 			EntityList m_drawables;
+			EntityList m_directionalLights;
 			EntityList m_lights;
+			EntityList m_pointSpotLights;
 			NzBackgroundRef m_background;
 			NzDepthRenderTechnique m_shadowTechnique;
 			NzForwardRenderTechnique m_renderTechnique;

SDK/src/NDK/Systems/RenderSystem.cpp

@@ -46,21 +46,40 @@ namespace Ndk
 			m_drawables.Remove(entity);
 
 		if (entity->HasComponent<LightComponent>() && entity->HasComponent<NodeComponent>())
-			m_lights.Insert(entity);
+		{
+			LightComponent& lightComponent = entity->GetComponent<LightComponent>();
+			if (lightComponent.GetLightType() == nzLightType_Directional)
+			{
+				m_directionalLights.Insert(entity);
+				m_pointSpotLights.Remove(entity);
+			}
 			else
+			{
+				m_directionalLights.Remove(entity);
+				m_pointSpotLights.Insert(entity);
+			}
+
+			m_lights.Insert(entity);
+		}
+		else
+		{
+			m_directionalLights.Remove(entity);
 			m_lights.Remove(entity);
+			m_pointSpotLights.Remove(entity);
+		}
 	}
 
 	void RenderSystem::OnUpdate(float elapsedTime)
 	{
 		NazaraUnused(elapsedTime);
 
-		UpdateShadowMaps();
+		UpdatePointSpotShadowMaps();
 
 		for (const Ndk::EntityHandle& camera : m_cameras)
 		{
 			CameraComponent& camComponent = camera->GetComponent<CameraComponent>();
-			camComponent.ApplyView();
+
+			//UpdateDirectionalShadowMaps(camComponent);
 
 			NzAbstractRenderQueue* renderQueue = m_renderTechnique.GetRenderQueue();
 			renderQueue->Clear();
@@ -81,6 +100,8 @@ namespace Ndk
 				lightComponent.AddToRenderQueue(renderQueue, lightNode.GetTransformMatrix());
 			}
 
+			camComponent.ApplyView();
+
 			NzSceneData sceneData;
 			sceneData.ambientColor = NzColor(25, 25, 25);
 			sceneData.background = m_background;
@@ -90,7 +111,7 @@ namespace Ndk
 		}
 	}
 
-	void RenderSystem::UpdateShadowMaps()
+	void RenderSystem::UpdateDirectionalShadowMaps(const NzAbstractViewer& viewer)
 	{
 		if (!m_shadowRT.IsValid())
 			m_shadowRT.Create();
@@ -100,18 +121,66 @@ namespace Ndk
 		dummySceneData.background = nullptr;
 		dummySceneData.viewer = nullptr; //< Depth technique doesn't require any viewer
 
-		for (const Ndk::EntityHandle& light : m_lights)
+		for (const Ndk::EntityHandle& light : m_directionalLights)
 		{
 			LightComponent& lightComponent = light->GetComponent<LightComponent>();
 			NodeComponent& lightNode = light->GetComponent<NodeComponent>();
 
-			if (!lightComponent.IsShadowCastingEnabled() || lightComponent.GetLightType() == nzLightType_Directional)
+			if (!lightComponent.IsShadowCastingEnabled())
+				continue;
+
+			NzVector2ui shadowMapSize(lightComponent.GetShadowMap()->GetSize());
+
+			m_shadowRT.AttachTexture(nzAttachmentPoint_Depth, 0, lightComponent.GetShadowMap());
+			NzRenderer::SetTarget(&m_shadowRT);
+			NzRenderer::SetViewport(NzRecti(0, 0, shadowMapSize.x, shadowMapSize.y));
+
+			NzAbstractRenderQueue* renderQueue = m_shadowTechnique.GetRenderQueue();
+			renderQueue->Clear();
+
+			///TODO: Culling
+			for (const Ndk::EntityHandle& drawable : m_drawables)
+			{
+				GraphicsComponent& graphicsComponent = drawable->GetComponent<GraphicsComponent>();
+				NodeComponent& drawableNode = drawable->GetComponent<NodeComponent>();
+
+				graphicsComponent.AddToRenderQueue(renderQueue);
+			}
+
+			///TODO: Cache the matrices in the light?
+			NzRenderer::SetMatrix(nzMatrixType_Projection, NzMatrix4f::Ortho(0.f, 100.f, 100.f, 0.f, 1.f, 100.f));
+			NzRenderer::SetMatrix(nzMatrixType_View, NzMatrix4f::ViewMatrix(lightNode.GetRotation() * NzVector3f::Forward() * 100.f, lightNode.GetRotation()));
+
+			m_shadowTechnique.Draw(dummySceneData);
+		}
+	}
+
+	void RenderSystem::UpdatePointSpotShadowMaps()
+	{
+		if (!m_shadowRT.IsValid())
+			m_shadowRT.Create();
+
+		NzSceneData dummySceneData;
+		dummySceneData.ambientColor = NzColor(0, 0, 0);
+		dummySceneData.background = nullptr;
+		dummySceneData.viewer = nullptr; //< Depth technique doesn't require any viewer
+
+		for (const Ndk::EntityHandle& light : m_pointSpotLights)
+		{
+			LightComponent& lightComponent = light->GetComponent<LightComponent>();
+			NodeComponent& lightNode = light->GetComponent<NodeComponent>();
+
+			if (!lightComponent.IsShadowCastingEnabled())
 				continue;
 
 			NzVector2ui shadowMapSize(lightComponent.GetShadowMap()->GetSize());
 
 			switch (lightComponent.GetLightType())
 			{
+				case nzLightType_Directional:
+					NazaraInternalError("Directional lights included in point/spot light list");
+					break;
+
 				case nzLightType_Point:
 				{
 					static NzQuaternionf rotations[6] =

include/Nazara/Graphics/AbstractRenderQueue.hpp

@@ -59,7 +59,9 @@ class NAZARA_GRAPHICS_API NzAbstractRenderQueue
 		struct DirectionalLight
 		{
 			NzColor color;
+			NzMatrix4f transformMatrix;
 			NzVector3f direction;
+			NzTexture* shadowMap;
 			float ambientFactor;
 			float diffuseFactor;
 		};

include/Nazara/Graphics/ForwardRenderTechnique.inl

@@ -25,6 +25,20 @@ inline void NzForwardRenderTechnique::SendLightUniforms(const NzShader* shader,
 				shader->SendColor(uniforms.locations.color + uniformOffset, light.color);
 				shader->SendVector(uniforms.locations.factors + uniformOffset, NzVector2f(light.ambientFactor, light.diffuseFactor));
 				shader->SendVector(uniforms.locations.parameters1 + uniformOffset, NzVector4f(light.direction));
+
+				shader->SendBoolean(uniforms.locations.shadowMapping + uniformOffset, light.shadowMap != nullptr);
+				if (light.shadowMap)
+				{
+					NzRenderer::SetTexture(availableTextureUnit, light.shadowMap);
+					NzRenderer::SetTextureSampler(availableTextureUnit, s_shadowSampler);
+
+					shader->SendMatrix(uniforms.locations.lightViewProjMatrix + index, light.transformMatrix);
+					shader->SendInteger(uniforms.locations.directionalSpotLightShadowMap + index, availableTextureUnit);
+				}
+				else
+					shader->SendInteger(uniforms.locations.directionalSpotLightShadowMap + index, dummyTexture);
+
+				shader->SendInteger(uniforms.locations.pointLightShadowMap + index, dummyCubemap);
 				break;
 			}
 
@@ -48,7 +62,7 @@ inline void NzForwardRenderTechnique::SendLightUniforms(const NzShader* shader,
 				else
 					shader->SendInteger(uniforms.locations.pointLightShadowMap + index, dummyCubemap);
 
-				shader->SendInteger(uniforms.locations.spotLightShadowMap + index, dummyTexture);
+				shader->SendInteger(uniforms.locations.directionalSpotLightShadowMap + index, dummyTexture);
 				break;
 			}
 
@@ -69,10 +83,10 @@ inline void NzForwardRenderTechnique::SendLightUniforms(const NzShader* shader,
 					NzRenderer::SetTextureSampler(availableTextureUnit, s_shadowSampler);
 
 					shader->SendMatrix(uniforms.locations.lightViewProjMatrix + index, light.transformMatrix);
-					shader->SendInteger(uniforms.locations.spotLightShadowMap + index, availableTextureUnit);
+					shader->SendInteger(uniforms.locations.directionalSpotLightShadowMap + index, availableTextureUnit);
 				}
 				else
-					shader->SendInteger(uniforms.locations.spotLightShadowMap + index, dummyTexture);
+					shader->SendInteger(uniforms.locations.directionalSpotLightShadowMap + index, dummyTexture);
 
 				shader->SendInteger(uniforms.locations.pointLightShadowMap + index, dummyCubemap);
 				break;
@@ -82,8 +96,8 @@ inline void NzForwardRenderTechnique::SendLightUniforms(const NzShader* shader,
 	else
 	{
 		shader->SendInteger(uniforms.locations.type + uniformOffset, -1); //< Disable the light in the shader
+		shader->SendInteger(uniforms.locations.directionalSpotLightShadowMap + index, dummyTexture);
 		shader->SendInteger(uniforms.locations.pointLightShadowMap + index, dummyCubemap);
-		shader->SendInteger(uniforms.locations.spotLightShadowMap + index, dummyTexture);
 	}
 }
 

include/Nazara/Graphics/Light.hpp

@@ -97,6 +97,7 @@ struct NzLightUniforms
 	{
 		int type;
 		int color;
+		int directionalSpotLightShadowMap;
 		int factors;
 		int lightViewProjMatrix;
 		int parameters1;
@@ -104,7 +105,6 @@ struct NzLightUniforms
 		int parameters3;
 		int pointLightShadowMap;
 		int shadowMapping;
-		int spotLightShadowMap;
 	};
 
 	bool ubo;

src/Nazara/Graphics/ForwardRenderTechnique.cpp

@@ -769,7 +769,7 @@ const NzForwardRenderTechnique::ShaderUniforms* NzForwardRenderTechnique::GetSha
 			uniforms.lightUniforms.locations.parameters3 = shader->GetUniformLocation("Lights[0].parameters3");
 			uniforms.lightUniforms.locations.pointLightShadowMap = shader->GetUniformLocation("PointLightShadowMap[0]");
 			uniforms.lightUniforms.locations.shadowMapping = shader->GetUniformLocation("Lights[0].shadowMapping");
-			uniforms.lightUniforms.locations.spotLightShadowMap = shader->GetUniformLocation("SpotLightShadowMap[0]");
+			uniforms.lightUniforms.locations.directionalSpotLightShadowMap = shader->GetUniformLocation("DirectionalSpotLightShadowMap[0]");
 		}
 		else
 			uniforms.hasLightUniforms = false;

src/Nazara/Graphics/Light.cpp

@@ -33,6 +33,11 @@ m_shadowMapUpdated(false)
 
 void NzLight::AddToRenderQueue(NzAbstractRenderQueue* renderQueue, const NzMatrix4f& transformMatrix) const
 {
+	static NzMatrix4f biasMatrix(0.5f, 0.f,  0.f,  0.f,
+								 0.f,  0.5f, 0.f,  0.f,
+								 0.f,  0.f,  0.5f, 0.f,
+								 0.5f, 0.5f, 0.5f, 1.f);
+
 	switch (m_type)
 	{
 		case nzLightType_Directional:
@@ -42,6 +47,8 @@ void NzLight::AddToRenderQueue(NzAbstractRenderQueue* renderQueue, const NzMatri
 			light.color = m_color;
 			light.diffuseFactor = m_diffuseFactor;
 			light.direction = transformMatrix.Transform(NzVector3f::Forward(), 0.f);
+			light.shadowMap = m_shadowMap.Get();
+			light.transformMatrix = NzMatrix4f::ViewMatrix(transformMatrix.GetRotation() * NzVector3f::Forward() * 100.f, transformMatrix.GetRotation()) * NzMatrix4f::Ortho(0.f, 100.f, 100.f, 0.f, 1.f, 100.f) * biasMatrix;
 
 			renderQueue->AddDirectionalLight(light);
 			break;
@@ -78,12 +85,6 @@ void NzLight::AddToRenderQueue(NzAbstractRenderQueue* renderQueue, const NzMatri
 			light.position = transformMatrix.GetTranslation();
 			light.radius = m_radius;
 			light.shadowMap = m_shadowMap.Get();
-
-			static NzMatrix4f biasMatrix(0.5f, 0.f,  0.f,  0.f,
-			                             0.f,  0.5f, 0.f,  0.f,
-			                             0.f,  0.f,  0.5f, 0.f,
-			                             0.5f, 0.5f, 0.5f, 1.f);
-
 			light.transformMatrix = NzMatrix4f::ViewMatrix(transformMatrix.GetTranslation(), transformMatrix.GetRotation()) * NzMatrix4f::Perspective(m_outerAngle*2.f, 1.f, 0.1f, m_radius) * biasMatrix;
 
 			renderQueue->AddSpotLight(light);

src/Nazara/Graphics/Resources/Shaders/PhongLighting/core.frag

@@ -36,7 +36,7 @@ struct Light
 // Lumières
 uniform Light Lights[3];
 uniform samplerCube PointLightShadowMap[3];
-uniform sampler2D SpotLightShadowMap[3];
+uniform sampler2D DirectionalSpotLightShadowMap[3];
 
 // Matériau
 uniform sampler2D MaterialAlphaMap;
@@ -94,10 +94,10 @@ float VectorToDepthValue(vec3 vec, float zNear, float zFar)
 	return (normZ + 1.0) * 0.5;
 }
 
-bool TestShadowDirectional()
+bool TestShadowDirectional(int lightIndex)
 {
-	///TODO
+	vec4 lightSpacePos = vLightSpacePos[lightIndex];
-	return true;
+	return texture(DirectionalSpotLightShadowMap[lightIndex], lightSpacePos.xy).x >= (lightSpacePos.z - 0.0005);
 }
 
 bool TestShadowPoint(int lightIndex, vec3 lightToWorld, float zNear, float zFar)
@@ -108,7 +108,7 @@ bool TestShadowPoint(int lightIndex, vec3 lightToWorld, float zNear, float zFar)
 bool TestShadowSpot(int lightIndex)
 {
 	vec4 lightSpacePos = vLightSpacePos[lightIndex];
-	return textureProj(SpotLightShadowMap[lightIndex], lightSpacePos.xyw).x >= (lightSpacePos.z - 0.0005)/lightSpacePos.w;
+	return textureProj(DirectionalSpotLightShadowMap[lightIndex], lightSpacePos.xyw).x >= (lightSpacePos.z - 0.0005)/lightSpacePos.w;
 }
 
 void main()
@@ -211,6 +211,11 @@ void main()
 					// Ambient
 					lightAmbient += lightColor.rgb * lightAmbientFactor * (MaterialAmbient.rgb + SceneAmbient.rgb);
 
+					#if SHADOW_MAPPING
+					if (Lights[i].shadowMapping && !TestShadowDirectional(i))
+						break;
+					#endif
+
 					// Diffuse
 					float lambert = max(dot(normal, lightDir), 0.0);