57 lines
1.1 KiB
Text
57 lines
1.1 KiB
Text
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/* Copyright (c) 2025, Sascha Willems
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*
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* SPDX-License-Identifier: MIT
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*
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*/
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#define LIGHT_COUNT 3
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struct VSInput
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{
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float4 Pos;
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}
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struct VSOutput
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{
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float4 Pos : SV_POSITION;
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int InstanceIndex;
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};
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struct GSOutput
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{
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float4 Pos : SV_POSITION;
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int Layer : SV_RenderTargetArrayIndex;
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};
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struct UBO
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{
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float4x4 mvp[LIGHT_COUNT];
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float4 instancePos[3];
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};
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ConstantBuffer<UBO> ubo;
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[shader("vertex")]
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VSOutput vertexMain(VSInput input, uint InstanceIndex: SV_InstanceID)
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{
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VSOutput output;
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output.InstanceIndex = InstanceIndex;
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output.Pos = input.Pos;
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return output;
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}
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[shader("geometry")]
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[maxvertexcount(3)]
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[instance(3)]
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void geometryMain(triangle VSOutput input[3], uint InvocationID : SV_GSInstanceID, inout TriangleStream<GSOutput> outStream)
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{
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float4 instancedPos = ubo.instancePos[input[0].InstanceIndex];
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for (int i = 0; i < 3; i++)
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{
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float4 tmpPos = input[i].Pos + instancedPos;
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GSOutput output;
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output.Pos = mul(ubo.mvp[InvocationID], tmpPos);
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output.Layer = InvocationID;
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outStream.Append( output );
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}
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outStream.RestartStrip();
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}
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