kwin/effects/taskbarthumbnail/fragment.glsl

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uniform sampler2D texUnit;
uniform vec2 offsets[25];
uniform vec4 kernel[25];
uniform int kernelSize;
void main(void)
{
vec4 sum = texture2D(texUnit, gl_TexCoord[0].st) * kernel[0];
for (int i = 1; i < kernelSize; i++) {
sum += texture2D(texUnit, gl_TexCoord[0].st - offsets[i]) * kernel[i];
sum += texture2D(texUnit, gl_TexCoord[0].st + offsets[i]) * kernel[i];
}
gl_FragColor = sum;
}