minetest/client/shaders/cloud_shader/opengl_fragment.glsl

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uniform vec4 fogColor;
uniform float fogDistance;
uniform float fogShadingParameter;
varying vec3 eyeVec;
varying lowp vec4 varColor;
void main(void)
{
vec4 col = varColor;
float clarity = clamp(fogShadingParameter
- fogShadingParameter * length(eyeVec) / fogDistance, 0.0, 1.0);
col.rgb = mix(fogColor.rgb, col.rgb, clarity);
gl_FragColor = col;
}