static const char* computeSrc = {
"#version 430\n"
"precision highp float;\n"
"precision highp int;\n"
"uniform int radius;\n"
"uniform float width;\n"
"uniform float height;\n"
"const float pi = 3.1415926;\n"
"float sigma = float(radius) * 0.25;\n"
"float s = 2 * sigma * sigma;\n"
"layout (rgba32f, binding =0) highp uniform image2D uImageIn;\n"
"layout (rgba32f, binding =1) highp uniform image2D uImageOut;\n"
"layout (local_size_x = 16, local_size_y = 16, local_size_z = 1) in;\n"
"void main() {\n"
" ivec2 id = ivec2(gl_GlobalInvocationID.xy); \n"
" ivec2 size = imageSize(uImageOut); >\n"
" if (id.x >= size.x || id.y >= size.y) { >\n"
" return; >\n"
" } >\n"
" vec2 scale = vec2(1.0) / vec2(width,height); \n"
" vec4 pixel = vec4(0.0); \n"
" float weightSum = 0.0; >\n"
" float weight = 0; >\n"
" vec2 offset = vec2(0.0); >\n"
" for (int i = -radius / 2; i < radius / 2; i++) \n"
" { >\n"
" for (int j = -radius / 2; j < radius / 2; j++) \n"
" { >\n"
" offset = vec2(i, j); >\n"
" weight = exp(-(offset.x * offset.x + offset.y * offset.y) / s) / (pi * s); \n"
" pixel += imageLoad(uImageIn, ivec2(x, y) + scale * offset) * weight; \n"
" weightSum += weight; >\n"
" } >\n"
" } >\n"
" pixel /= weightSum; >\n"
" imageStore(uImageOut, id, pixel); >\n"
" >\n"
"}\n"
};
Check the shader for compilation and linking errors, use glGetShaderInfoLog and glGetProgramInfoLog to obtain any diagnostic messages (regardless of whether there was an error).
Is the coordinate of imageLoad wrong?
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