33 lines
607 B
GLSL
33 lines
607 B
GLSL
#version {VERSION}
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#ifdef GL_ES
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precision mediump float;
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#endif
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uniform float From;
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uniform float To;
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uniform float Blend;
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uniform sampler2D WorldTexture;
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out vec4 fragColor;
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vec4 ColorForEffect(float effect, vec4 c)
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{
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if (effect > 1.5)
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{
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float lum = 0.5 * (min(c.r, min(c.g, c.b)) + max(c.r, max(c.g, c.b)));
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return vec4(lum, lum, lum, c.a);
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}
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if (effect > 0.5)
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{
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return vec4(0, 0, 0, c.a);
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}
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return c;
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}
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void main()
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{
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vec4 c = texture(WorldTexture, gl_FragCoord.xy / textureSize(WorldTexture, 0));
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fragColor = ColorForEffect(From, c) * Blend + ColorForEffect(To, c) * (1.0 - Blend);
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}
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