22 lines
438 B
GLSL
22 lines
438 B
GLSL
#version 330 core
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in vec3 direction;
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out vec4 frag_color;
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uniform sampler2D equirect;
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const vec2 inv_atan = vec2(0.15915494309, 0.31830988618);
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vec2 sample_spherical_map(vec3 v) {
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vec2 uv = vec2(atan(v.z, v.x), asin(v.y));
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uv *= inv_atan;
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uv += 0.5;
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return uv;
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}
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void main() {
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vec2 uv = sample_spherical_map(normalize(direction));
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vec3 color = texture(equirect, uv).rgb;
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frag_color = vec4(color, 1.0);
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}
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