66 lines
1.4 KiB
Text
66 lines
1.4 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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struct VSOutput
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{
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float4 Pos : SV_POSITION;
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float2 UV;
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};
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[[vk::input_attachment_index(0)]] SubpassInput inputPosition;
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[[vk::input_attachment_index(1)]] SubpassInput inputNormal;
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[[vk::input_attachment_index(2)]] SubpassInput inputAlbedo;
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struct Light {
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float4 position;
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float3 color;
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float radius;
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};
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RWStructuredBuffer<Light> lights;
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[shader("vertex")]
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VSOutput vertexMain(uint VertexIndex: SV_VertexID)
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{
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VSOutput output;
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output.UV = float2((VertexIndex << 1) & 2, VertexIndex & 2);
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output.Pos = float4(output.UV * 2.0f - 1.0f, 0.0f, 1.0f);
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return output;
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}
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[shader("fragment")]
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float4 fragmentMain()
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{
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// Read G-Buffer values from previous sub pass
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float3 fragPos = inputPosition.SubpassLoad().rgb;
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float3 normal = inputNormal.SubpassLoad().rgb;
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float4 albedo = inputAlbedo.SubpassLoad();
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#define ambient 0.05
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// Ambient part
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float3 fragcolor = albedo.rgb * ambient;
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uint lightsLength;
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uint lightsStride;
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lights.GetDimensions(lightsLength, lightsStride);
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for(int i = 0; i < lightsLength; ++i)
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{
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float3 L = lights[i].position.xyz - fragPos;
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float dist = length(L);
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L = normalize(L);
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float atten = lights[i].radius / (pow(dist, 3.0) + 1.0);
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float3 N = normalize(normal);
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float NdotL = max(0.0, dot(N, L));
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float3 diff = lights[i].color * albedo.rgb * NdotL * atten;
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fragcolor += diff;
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}
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return float4(fragcolor, 1.0);
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}
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