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XProger/quinqunx_3x3_blur.glsl

Last active February 2, 2017 00:30
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Get average color for 3x3 kernel by 4 fetch using bilinear filter
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quinqunx_3x3_blur.glsl
vec4 dx = vec4(0.25, 0.96, -0.25, -0.96) * uTexelSize.xyxy + vTexCoord.xyxy;
vec4 dy = vec4(0.25, 0.96, -0.25, -0.96) * uTexelSize.yxyx + vTexCoord.yxyx;
vec4 average = (texture2D(sTex, dx.zy) + texture2D(sTex, dx.xw) +
texture2D(sTex, dy.yx) + texture2D(sTex, dy.wz)) * 0.25;
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