mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-12-23 11:01:46 +00:00
49 lines
956 B
GLSL
49 lines
956 B
GLSL
uniform sampler2D palette;
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uniform sampler2D texture;
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uniform float realtime;
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uniform vec4 fog;
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varying vec2 tst;
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varying vec4 color;
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const float SPEED = 20.0;
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const float CYCLE = 128.0;
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const float PI = 3.14159;
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const float FACTOR = PI * 2.0 / CYCLE;
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const vec2 BIAS = vec2 (1.0, 1.0);
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const float SCALE = 8.0;
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float
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sqr (float x)
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{
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return x * x;
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}
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vec4
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fogBlend (vec4 color)
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{
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float f;
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vec4 fog_color = vec4 (fog.rgb, 1.0);
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f = exp (-sqr (fog.a * gl_FragCoord.z / gl_FragCoord.w));
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return vec4 (mix (fog_color.rgb, color.rgb, f), color.a);
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}
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vec2
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turb_st (vec2 st, float time)
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{
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vec2 angle = st.ts * CYCLE / 2.0;
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vec2 phase = vec2 (time, time) * SPEED;
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return st + (sin ((angle + phase) * FACTOR) + BIAS) / SCALE;
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}
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void
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main (void)
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{
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float pix;
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vec2 st;
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st = turb_st (tst, realtime);
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pix = texture2D (texture, st).r;
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gl_FragColor = fogBlend (texture2D (palette, vec2 (pix, 0.0)) * color);
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}
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