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gzdoom/wadsrc/static/shaders/glsl/func_brightmap.fp

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GLSL

uniform sampler2D texture2;
vec4 ProcessTexel()
{
return getTexel(vTexCoord.st);
}
vec4 ProcessLight(vec4 color)
{
vec4 brightpix = desaturate(texture(texture2, vTexCoord.st));
return vec4(min (color.rgb + brightpix.rgb, 1.0), color.a);
}