Add support for depth clamping

include/Nazara/Graphics/Material.hpp

@@ -42,6 +42,7 @@ namespace Nz
 			inline void EnableBlending(bool blending);
 			inline void EnableColorWrite(bool colorWrite);
 			inline void EnableDepthBuffer(bool depthBuffer);
+			inline void EnableDepthClamp(bool depthClamp);
 			inline void EnableDepthSorting(bool depthSorting);
 			inline void EnableDepthWrite(bool depthWrite);
 			inline void EnableFaceCulling(bool faceCulling);
@@ -84,6 +85,7 @@ namespace Nz
 			inline bool IsBlendingEnabled() const;
 			inline bool IsColorWriteEnabled() const;
 			inline bool IsDepthBufferEnabled() const;
+			inline bool IsDepthClampEnabled() const;
 			inline bool IsDepthSortingEnabled() const;
 			inline bool IsDepthWriteEnabled() const;
 			inline bool IsFaceCullingEnabled() const;

include/Nazara/Graphics/Material.inl

@@ -115,6 +115,28 @@ namespace Nz
 		InvalidatePipeline();
 	}
 
+	/*!
+	* \brief Enable/Disable depth clamp for this material
+	*
+	* When enabled, all fragments generated by this material will be clamped to znear or zfar
+	* instead of being clipped out when outside this range.
+	*
+	* This can be useful to prevent clipping near or far primitives.
+	*
+	* \param depthClamp Defines if this material will use depth clamping
+	*
+	* \remark Invalidates the pipeline
+	* \remark Depth clamping requires RenderDeviceFeatures::depthClamping to be true
+	*
+	* \see IsDepthClampEnabled
+	*/
+	inline void Material::EnableDepthClamp(bool depthClamp)
+	{
+		m_pipelineInfo.depthClamp = depthClamp;
+
+		InvalidatePipeline();
+	}
+
 	/*!
 	* \brief Enable/Disable depth sorting for this material
 	*
@@ -524,6 +546,15 @@ namespace Nz
 		return m_pipelineInfo.depthBuffer;
 	}
 
+	/*!
+	* \brief Checks whether this material has depth clamping enabled
+	* \return true If it is the case
+	*/
+	inline bool Material::IsDepthClampEnabled() const
+	{
+		return false;
+	}
+
 	/*!
 	* \brief Checks whether this material has depth sorting enabled
 	* \return true If it is the case

include/Nazara/OpenGLRenderer/Wrapper/Context.hpp

@@ -48,6 +48,7 @@ namespace Nz::GL
 
 	enum class Extension
 	{
+		DepthClamp,
 		SpirV,
 		TextureCompressionS3tc,
 		TextureFilterAnisotropic,

include/Nazara/Renderer/RenderDeviceInfo.hpp

@@ -16,6 +16,7 @@ namespace Nz
 	struct RenderDeviceFeatures
 	{
 		bool anisotropicFiltering = false;
+		bool depthClamping = false;
 		bool nonSolidFaceFilling = false;
 	};
 

include/Nazara/Renderer/RenderPipeline.hpp

@@ -7,9 +7,9 @@
 #ifndef NAZARA_RENDERPIPELINE_HPP
 #define NAZARA_RENDERPIPELINE_HPP
 
-#include <Nazara/Utility/Enums.hpp>
 #include <Nazara/Renderer/RenderPipelineLayout.hpp>
 #include <Nazara/Renderer/RenderStates.hpp>
+#include <Nazara/Utility/Enums.hpp>
 
 namespace Nz
 {
@@ -26,6 +26,8 @@ namespace Nz
 		std::vector<VertexBufferData> vertexBuffers;
 	};
 
+	class RenderDevice;
+
 	class NAZARA_RENDERER_API RenderPipeline
 	{
 		public:
@@ -33,6 +35,9 @@ namespace Nz
 			virtual ~RenderPipeline();
 
 			virtual const RenderPipelineInfo& GetPipelineInfo() const = 0;
+
+		protected:
+			static void ValidatePipelineInfo(const RenderDevice& device, RenderPipelineInfo& pipelineInfo);
 	};
 }
 

include/Nazara/Renderer/RenderStates.hpp

@@ -49,6 +49,7 @@ namespace Nz
 		bool blending    = false;
 		bool colorWrite  = true;
 		bool depthBuffer = false;
+		bool depthClamp  = false;
 		bool depthWrite  = true;
 		bool faceCulling = false;
 		bool scissorTest = false;

include/Nazara/Renderer/RenderStates.inl

@@ -19,6 +19,7 @@ namespace Nz
 		NazaraRenderStateBoolMember(blending);
 		NazaraRenderStateBoolMember(colorWrite);
 		NazaraRenderStateBoolMember(depthBuffer);
+		NazaraRenderStateBoolMember(depthClamp);
 		NazaraRenderStateBoolMember(faceCulling);
 		NazaraRenderStateBoolMember(scissorTest);
 		NazaraRenderStateBoolMember(stencilTest);
@@ -95,6 +96,7 @@ namespace std
 			NazaraRenderStateBool(blending);
 			NazaraRenderStateBool(colorWrite);
 			NazaraRenderStateBool(depthBuffer);
+			NazaraRenderStateBool(depthClamp);
 			NazaraRenderStateBool(faceCulling);
 			NazaraRenderStateBool(scissorTest);
 			NazaraRenderStateBool(stencilTest);