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38 lines
1.5 KiB
38 lines
1.5 KiB
#if SHADERPASS != SHADERPASS_FOGVOLUME_PREVIEW
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#error SHADERPASS_is_not_correctly_define
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#endif
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#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/GeometricTools.hlsl"
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#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/VolumeRendering.hlsl"
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#include "Packages/com.unity.render-pipelines.high-definition/Runtime/Core/Utilities/GeometryUtils.cs.hlsl"
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#include "Packages/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricLighting/HDRenderPipeline.VolumetricLighting.cs.hlsl"
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struct VertexToFragment
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{
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float4 positionCS : SV_POSITION;
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float3 viewDirectionWS : TEXCOORD0;
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};
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VertexToFragment Vert(uint instanceId : INSTANCEID_SEMANTIC, uint vertexId : VERTEXID_SEMANTIC)
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{
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VertexToFragment output;
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ZERO_INITIALIZE(VertexToFragment, output);
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// Workaround because we can't customize the ShaderGraph preview
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// To ensure that we always draw a box volume with fog inside, we do a fullscreen quad in the ShaderGraph preview
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// This works because in most case the min vertex count of the models in SG preview is 4.
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if (vertexId < 3)
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{
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output.positionCS = GetFullScreenTriangleVertexPosition(vertexId);
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float3 positionWS = ComputeWorldSpacePosition(output.positionCS, UNITY_MATRIX_I_VP);
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output.viewDirectionWS = GetWorldSpaceViewDir(positionWS);
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}
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return output;
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}
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void Frag(VertexToFragment v2f, out float4 outColor : SV_Target0)
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{
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// For now it's not possible to have a ShaderGraph preview of fog
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outColor = 0;
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}
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