69 lines
1.6 KiB
GLSL
69 lines
1.6 KiB
GLSL
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// Copyright 2020 Google LLC
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Texture2D shadowMapTexture : register(t1);
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SamplerState shadowMapSampler : register(s1);
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struct VSOutput
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{
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[[vk::location(0)]] float3 Normal : NORMAL0;
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[[vk::location(1)]] float3 Color : COLOR0;
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[[vk::location(2)]] float3 ViewVec : TEXCOORD1;
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[[vk::location(3)]] float3 LightVec : TEXCOORD2;
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[[vk::location(4)]] float4 ShadowCoord : TEXCOORD3;
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};
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[[vk::constant_id(0)]] const int enablePCF = 0;
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#define ambient 0.1
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float textureProj(float4 shadowCoord, float2 off)
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{
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float shadow = 1.0;
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if ( shadowCoord.z > -1.0 && shadowCoord.z < 1.0 )
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{
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float dist = shadowMapTexture.Sample( shadowMapSampler, shadowCoord.xy + off ).r;
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if ( shadowCoord.w > 0.0 && dist < shadowCoord.z )
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{
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shadow = ambient;
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}
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}
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return shadow;
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}
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float filterPCF(float4 sc)
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{
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int2 texDim;
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shadowMapTexture.GetDimensions(texDim.x, texDim.y);
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float scale = 1.5;
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float dx = scale * 1.0 / float(texDim.x);
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float dy = scale * 1.0 / float(texDim.y);
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float shadowFactor = 0.0;
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int count = 0;
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int range = 1;
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for (int x = -range; x <= range; x++)
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{
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for (int y = -range; y <= range; y++)
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{
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shadowFactor += textureProj(sc, float2(dx*x, dy*y));
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count++;
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}
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}
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return shadowFactor / count;
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}
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float4 main(VSOutput input) : SV_TARGET
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{
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float shadow = (enablePCF == 1) ? filterPCF(input.ShadowCoord / input.ShadowCoord.w) : textureProj(input.ShadowCoord / input.ShadowCoord.w, float2(0.0, 0.0));
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float3 N = normalize(input.Normal);
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float3 L = normalize(input.LightVec);
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float3 V = normalize(input.ViewVec);
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float3 R = normalize(-reflect(L, N));
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float3 diffuse = max(dot(N, L), ambient) * input.Color;
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return float4(diffuse * shadow, 1.0);
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}
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