0ad/binaries/data/mods/public/shaders/glsl/sky.fs

#version 110

uniform samplerCube baseTex;
varying vec3 v_tex;

void main()
{
  
  vec4 tex = textureCube(baseTex, v_tex);

  float m = (1.0 - v_tex.y) - 0.75;
  m *= 4.0;

  gl_FragColor = (v_tex.y > 0.0) ? (tex * m) : tex;
  
}