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

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uniform sampler2D spritea;
uniform sampler2D spriteb;
uniform sampler2D palette;
varying float blend;
varying vec4 colora, colorb;
varying vec2 sta, stb;
void
main (void)
{
float pixa, pixb;
vec4 cola, colb;
vec4 col;
pixa = texture2D (spritea, sta).r;
pixb = texture2D (spriteb, stb).r;
if (pixa == 1.0 && pixb == 1.0)
discard;
cola = texture2D (palette, vec2 (pixa, 0.5)) * colora;
colb = texture2D (palette, vec2 (pixb, 0.5)) * colorb;
col = mix (cola, colb, blend);
if (col.a == 0.0)
discard;
gl_FragColor = col;
}