37 lines
1.1 KiB
Plaintext
37 lines
1.1 KiB
Plaintext
// From http://http.developer.nvidia.com/GPUGems3/gpugems3_ch40.html
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uniform layout(size1x16) restrict readonly image2D source;
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uniform layout(size1x16) volatile restrict writeonly image2D dest;
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uniform float sigma = 5.;
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layout (local_size_x = 8, local_size_y = 8) in;
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shared float local_src[8][8 + 2 * 8];
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void main()
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{
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int x = int(gl_LocalInvocationID.x), y = int(gl_LocalInvocationID.y);
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ivec2 uv = ivec2(gl_GlobalInvocationID.x, gl_GlobalInvocationID.y);
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local_src[x][y] = imageLoad(source, ivec2(uv) - ivec2(0, 8)).x;
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local_src[x][y + 8] = imageLoad(source, ivec2(uv)).x;
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local_src[x][y + 16] = imageLoad(source, ivec2(uv) + ivec2(0, 8)).x;
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barrier();
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float g0, g1, g2;
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g0 = 1.0 / (sqrt(2.0 * 3.14) * sigma);
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g1 = exp(-0.5 / (sigma * sigma));
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g2 = g1 * g1;
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float sum = local_src[x][y + 8] * g0;
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g0 *= g1;
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g1 *= g2;
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for (int j = 1; j < 8; j++) {
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sum += local_src[x][y + 8 + j] * g0;
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sum += local_src[x][y + 8 - j] * g0;
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g0 *= g1;
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g1 *= g2;
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}
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imageStore(dest, ivec2(uv), vec4(sum));
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}
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