Add support for depth clamping

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