forked from 0ad/0ad
40 lines
861 B
GLSL
40 lines
861 B
GLSL
#version 110
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uniform sampler2D baseTex;
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uniform sampler2D losTex;
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varying vec2 v_tex;
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varying vec2 v_los;
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varying vec4 v_color;
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uniform vec3 sunColor;
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uniform vec3 fogColor;
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uniform vec2 fogParams;
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vec4 get_fog(vec4 color)
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{
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float density = fogParams.x;
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float maxFog = fogParams.y;
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const float LOG2 = 1.442695;
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float z = gl_FragCoord.z / gl_FragCoord.w;
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float fogFactor = exp2(-density * density * z * z * LOG2);
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fogFactor = fogFactor * (1.0 - maxFog) + maxFog;
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fogFactor = clamp(fogFactor, 0.0, 1.0);
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return vec4(mix(fogColor, color.rgb, fogFactor),color.a);
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}
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void main()
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{
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vec4 color = texture2D(baseTex, v_tex) * vec4((v_color.rgb + sunColor)/2.0,v_color.a);
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float los = texture2D(losTex, v_los).a;
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los = los < 0.03 ? 0.0 : los;
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color.rgb *= los;
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gl_FragColor = get_fog(color);
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}
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