mirror of https://github.com/ZDoom/raze-gles.git
55 lines
2.2 KiB
GLSL
55 lines
2.2 KiB
GLSL
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layout(location=0) in vec2 TexCoord;
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layout(location=0) out vec4 FragColor;
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layout(binding=0) uniform sampler2D AODepthTexture;
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#define KERNEL_RADIUS 3.0
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void AddSample(vec2 blurSample, float r, float centerDepth, inout float totalAO, inout float totalW)
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{
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const float blurSigma = KERNEL_RADIUS * 0.5;
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const float blurFalloff = 1.0 / (2.0 * blurSigma * blurSigma);
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float ao = blurSample.x;
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float z = blurSample.y;
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float deltaZ = (z - centerDepth) * BlurSharpness;
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float w = exp2(-r * r * blurFalloff - deltaZ * deltaZ);
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totalAO += w * ao;
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totalW += w;
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}
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void main()
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{
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vec2 centerSample = textureOffset(AODepthTexture, TexCoord, ivec2( 0, 0)).xy;
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float centerDepth = centerSample.y;
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float totalAO = centerSample.x;
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float totalW = 1.0;
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#if defined(BLUR_HORIZONTAL)
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AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(-3, 0)).xy, 3.0, centerDepth, totalAO, totalW);
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AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(-2, 0)).xy, 2.0, centerDepth, totalAO, totalW);
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AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(-1, 0)).xy, 1.0, centerDepth, totalAO, totalW);
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AddSample(textureOffset(AODepthTexture, TexCoord, ivec2( 1, 0)).xy, 1.0, centerDepth, totalAO, totalW);
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AddSample(textureOffset(AODepthTexture, TexCoord, ivec2( 2, 0)).xy, 2.0, centerDepth, totalAO, totalW);
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AddSample(textureOffset(AODepthTexture, TexCoord, ivec2( 3, 0)).xy, 3.0, centerDepth, totalAO, totalW);
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#else
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AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(0, -3)).xy, 3.0, centerDepth, totalAO, totalW);
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AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(0, -2)).xy, 2.0, centerDepth, totalAO, totalW);
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AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(0, -1)).xy, 1.0, centerDepth, totalAO, totalW);
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AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(0, 1)).xy, 1.0, centerDepth, totalAO, totalW);
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AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(0, 2)).xy, 2.0, centerDepth, totalAO, totalW);
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AddSample(textureOffset(AODepthTexture, TexCoord, ivec2(0, 3)).xy, 3.0, centerDepth, totalAO, totalW);
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#endif
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float fragAO = totalAO / totalW;
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#if defined(BLUR_HORIZONTAL)
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FragColor = vec4(fragAO, centerDepth, 0.0, 1.0);
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#else
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FragColor = vec4(pow(clamp(fragAO, 0.0, 1.0), PowExponent), 0.0, 0.0, 1.0);
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#endif
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}
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