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// Antoine Rousseau september 2015
#version 120
uniform samplerCube envMap;
uniform float alpha = 1.0;
void main() {
vec2 tc = gl_TexCoord[0].st ;
vec2 thetaphi = ((tc * 2.0) - vec2(1.0)) * vec2(3.1415926535897932384626433832795, 1.5707963267948966192313216916398);
float ctpy = cos(thetaphi.y);
vec3 rayDirection = vec3(ctpy * cos(thetaphi.x), sin(thetaphi.y), ctpy * sin(thetaphi.x));
gl_FragColor = textureCube(envMap, rayDirection);
gl_FragColor.a *= alpha;
}
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