18 lines
432 B
Plaintext
18 lines
432 B
Plaintext
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float hash(const vec2 p) {
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float h = dot(p, vec2(127.1, 311.7));
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return fract(sin(h) * 43758.5453123);
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}
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vec2 envMapEquirect(const vec3 normal) {
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const float PI = 3.1415926535;
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const float PI2 = PI * 2.0;
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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 / PI2, phi / PI);
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}
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float rand(vec2 co) { // Unreliable
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return fract(sin(dot(co.xy, vec2(12.9898,78.233))) * 43758.5453);
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}
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