picom/compton-fake-transparency-f...

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uniform float opacity;
uniform bool invert_color;
uniform sampler2D tex;
void main() {
vec4 c = texture2D(tex, gl_TexCoord[0]);
{
// Change vec4(1.0, 1.0, 1.0, 1.0) to your desired color
vec4 vdiff = abs(vec4(1.0, 1.0, 1.0, 1.0) - c);
float diff = max(max(max(vdiff.r, vdiff.g), vdiff.b), vdiff.a);
// Change 0.8 to your desired opacity
if (diff < 0.001)
c *= 0.8;
}
if (invert_color)
c = vec4(vec3(c.a, c.a, c.a) - vec3(c), c.a);
c *= opacity;
gl_FragColor = c;
}