30 lines
513 B
GLSL
30 lines
513 B
GLSL
#version 450
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#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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// uniform sampler2D tex;
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in vec3 normal;
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// in vec2 texCoord;
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vec2 envMapEquirect(vec3 normal) {
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float phi = acos(normal.z);
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float theta = atan(-normal.y, normal.x) + PI;
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return vec2(theta / TwoPI, phi / PI);
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}
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void main() {
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// if (texture(tex, texCoord).a == 0.0) {
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// discard;
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// }
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vec3 n = normalize(normal);
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gl_FragColor = texture(envmap, envMapEquirect(n));
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}
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