Pass
{
	Name "DBufferMesh"
	Tags {"LightMode"="DBufferVFX"}


	Cull Front
    ZWrite Off
    ZTest Greater


    // using alpha compositing https://developer.nvidia.com/gpugems/GPUGems3/gpugems3_ch23.html
    Blend 0 SrcAlpha OneMinusSrcAlpha, Zero OneMinusSrcAlpha
    Blend 1 SrcAlpha OneMinusSrcAlpha, Zero OneMinusSrcAlpha
    Blend 2 SrcAlpha OneMinusSrcAlpha, Zero OneMinusSrcAlpha
    Blend 3 Zero OneMinusSrcColor


    ColorMask ${VFXDecalColorMask0}
    ColorMask ${VFXDecalColorMask1} 1
    ColorMask ${VFXDecalColorMask2} 2
    ColorMask ${VFXDecalColorMask3} 3

	HLSLPROGRAM
	#pragma target 4.5
	#pragma multi_compile _ RENDERING_LAYERS
	#pragma multi_compile _ DEBUG_DISPLAY
    #pragma multi_compile_fragment DECALS_3RT DECALS_4RT
    #pragma multi_compile_fragment _ DECAL_SURFACE_GRADIENT

	#define UNITY_MATERIAL_LIT

	${VFXIncludeRP("VFXDecalVaryings.template")}
    #include "Packages/com.unity.render-pipelines.high-definition/Runtime/Material/Decal/Decal.hlsl"
	#include "Packages/com.unity.render-pipelines.high-definition/Runtime/Material/Decal/DecalPrepassBuffer.hlsl"
    #include "Packages/com.unity.render-pipelines.core/ShaderLibrary/NormalSurfaceGradient.hlsl"



	struct ps_input
	{
		float4 pos : SV_POSITION;
		${VFXHDRPDecalDeclareVaryings}
		UNITY_VERTEX_OUTPUT_STEREO
	};

	${VFXHDRPDecalVaryingsMacros}

	${VFXBegin:VFXVertexAdditionalProcess}
	${VFXHDRPDecalFillVaryings}
	${VFXEnd}


${VFXInclude("Shaders/ParticleHexahedron/Pass.template")}
#define SHADERPASS SHADERPASS_VFX_DBUFFER_PROJECTOR
${VFXIncludeRP("VFXDecal.template")}

	#pragma fragment frag
	void frag(ps_input i, OUTPUT_DBUFFER(outDBuffer))
	{
		UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);
#if VFX_USE_GRAPH_VALUES
        uint instanceActiveIndex = i.VFX_VARYINGS_INSTANCE_ACTIVE_INDEX;
        ${VFXLoadGraphValues}
#endif
        //TODO Ludovic: pass graphValues here
		VFXComputePixelOutputToDBuffer(i,outDBuffer);
	}
	ENDHLSL
}