mirror of https://github.com/ZDoom/qzdoom.git
60 lines
1.1 KiB
GLSL
60 lines
1.1 KiB
GLSL
uniform int fogenabled;
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uniform vec4 fogcolor;
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uniform vec3 camerapos;
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varying vec4 pixelpos;
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varying vec4 fogparm;
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uniform sampler2D tex;
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vec4 Process(vec4 color);
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//===========================================================================
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//
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// Gets a texel and performs common manipulations
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//
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//===========================================================================
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vec4 desaturate(vec4 texel)
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{
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return texel;
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}
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vec4 getTexel(vec2 st)
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{
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vec4 texel = texture2D(tex, st);
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return texel;
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}
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//===========================================================================
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//
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// Main shader routine
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//
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//===========================================================================
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void main()
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{
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float fogdist;
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float fogfactor;
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//
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// calculate fog factor
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//
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#ifndef NO_SM4
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if (fogenabled == -1)
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{
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fogdist = pixelpos.w;
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}
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else
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{
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fogdist = max(16.0, distance(pixelpos.xyz, camerapos));
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}
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#else
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fogdist = pixelpos.w;
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#endif
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fogfactor = exp2 (fogparm.z * fogdist);
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vec4 frag = Process(vec4(1.0,1.0,1.0,1.0));
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gl_FragColor = vec4(fogcolor.rgb, (1.0 - fogfactor) * frag.a * 0.75 * gl_Color.a);
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}
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