23 lines
450 B
GLSL
23 lines
450 B
GLSL
#ifdef GL_ES
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precision mediump float;
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#endif
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#define PI 3.1415926
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#define TwoPI (2.0 * PI)
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uniform sampler2D envmap;
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varying vec3 wcNormal;
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vec2 envMapEquirect(vec3 wcNormal, float flipEnvMap) {
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float phi = acos(wcNormal.z);
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float theta = atan(flipEnvMap * wcNormal.x, wcNormal.y) + PI;
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return vec2(theta / TwoPI, phi / PI);
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}
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void kore() {
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vec3 N = normalize(wcNormal);
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gl_FragColor = texture2D(envmap, envMapEquirect(N, -1.0));
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}
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