100 lines
2.8 KiB
HLSL
100 lines
2.8 KiB
HLSL
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#if (SHADERPASS != SHADERPASS_ATLAS_PROJECTOR)
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#error SHADERPASS_is_not_correctly_define
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#endif
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uniform float4 _DiffuseScaleBias;
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uniform float4 _NormalScaleBias;
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uniform float4 _MaskScaleBias;
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uniform float4 _TextureTypes;
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struct Attributes
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{
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uint vertexID : SV_VertexID;
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};
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struct Varyings
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{
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float4 positionCS : SV_POSITION;
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float2 uv : TEXCOORD0;
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uint type : TEXCOORD1;
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};
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float4 GetOutputPositionCS(float4 pos, float4 scaleBias)
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{
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float4 positionCS = pos * float4(scaleBias.x, scaleBias.y, 1, 1) + float4(scaleBias.z, scaleBias.w, 0, 0);
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positionCS.xy = positionCS.xy * float2(2.0f, -2.0f) + float2(-1.0f, 1.0f);
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return positionCS;
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}
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Varyings Vert(Attributes input)
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{
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Varyings output;
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uint vertexID = input.vertexID % 4;
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float4 pos = GetQuadVertexPosition(vertexID);
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const uint type = _TextureTypes[input.vertexID / 4];
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float4 scaleBias = float4(0, 0, 0, 0);
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switch (type)
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{
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case DECALATLASTEXTURETYPE_DIFFUSE:
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scaleBias = _DiffuseScaleBias; break;
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case DECALATLASTEXTURETYPE_NORMAL:
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scaleBias = _NormalScaleBias; break;
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case DECALATLASTEXTURETYPE_MASK:
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scaleBias = _MaskScaleBias; break;
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}
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output.positionCS = GetOutputPositionCS(pos, scaleBias);
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output.uv = GetQuadTexCoord(vertexID);
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output.type = type;
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return output;
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}
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void Frag(Varyings input,
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out float4 outColor : SV_Target0)
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{
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FragInputs fragInputs = (FragInputs)0;
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#ifdef FRAG_INPUTS_USE_TEXCOORD0
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fragInputs.texCoord0.xy = input.uv;
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#endif
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#ifdef FRAG_INPUTS_USE_TEXCOORD1
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fragInputs.texCoord1.xy = input.uv;
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#endif
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#ifdef FRAG_INPUTS_USE_TEXCOORD2
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fragInputs.texCoord2.xy = input.uv;
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#endif
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#ifdef FRAG_INPUTS_USE_TEXCOORD3
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fragInputs.texCoord3.xy = input.uv;
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#endif
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SurfaceDescriptionInputs inputs = FragInputsToSurfaceDescriptionInputs(fragInputs, float3(0,0,0));
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SurfaceDescription surface = SurfaceDescriptionFunction(inputs);
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switch (input.type)
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{
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case DECALATLASTEXTURETYPE_DIFFUSE:
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{
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outColor = float4(surface.BaseColor, surface.Alpha);
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break;
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}
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case DECALATLASTEXTURETYPE_NORMAL:
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{
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// Perform the same logic as UnpackNormalAG in Packing.hlsl in reverse
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const float2 compressedNormal = (surface.NormalTS.xy + 1.0f) * 0.5f;
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// Store alpha into b channel since that one is not being used during the unpacking
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outColor = float4(1.0f, compressedNormal.y, surface.NormalAlpha, compressedNormal.x);
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break;
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}
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case DECALATLASTEXTURETYPE_MASK:
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{
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outColor = float4(surface.Metallic, surface.Occlusion, surface.MAOSAlpha, surface.Smoothness);
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break;
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}
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default:
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{
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outColor = float4(0, 0, 0, 0);
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break;
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}
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}
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}
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