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#define M_PI 3.1415926535897932384626433832795
uniform samplerCube envmap;
in vec4 fragTexCoord;
out vec4 fragOut0;
layout (location = 0) out vec4 outColor;
void main() {
const float theta = -fragTexCoord.x * (2.0 * M_PI);
const float phi = fragTexCoord.y * (M_PI) - (0.5 * M_PI);
const float st = sin(theta);
const float ct = cos(theta);
const float sp = sin(phi);
const float cp = cos(phi);
const vec3 sampVec = vec3(cp * ct, sp, cp * st);
fragOut0 = vec4(texture(envmap, sampVec).rgb, 1.0);
}
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