quakeforge/libs/video/renderer/glsl/quakebsp.frag

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uniform sampler2D colormap;
uniform sampler2D texture;
uniform sampler2D lightmap;
varying vec2 tst;
varying vec2 lst;
void
main (void)
{
float pix = texture2D (texture, tst).r;
float light = texture2D (lightmap, lst).r;
float col;
gl_FragColor = texture2D (colormap, vec2 (pix, light * 4.0));
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}