stk-code_catmod/data/shaders/glow.frag

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uniform sampler2D tex;
uniform vec2 res;
void main()
{
vec2 coords = gl_FragCoord.xy / res;
vec4 col = texture2D(tex, coords);
float alpha = col.a;
if (alpha < 0.04) discard;
col *= vec4(vec3(4.0), 1.5);
col.a *= 0.6;
gl_FragColor = col;
}