From 33d5f67044d104d69cb2d11e78e6a79bc20d4c4e Mon Sep 17 00:00:00 2001 From: pryazha Date: Wed, 23 Jul 2025 20:55:29 +0500 Subject: some prb examples --- pbr/2.1.1.ibl_irradiance_conversion/cubemap.frag | 25 ++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 pbr/2.1.1.ibl_irradiance_conversion/cubemap.frag (limited to 'pbr/2.1.1.ibl_irradiance_conversion/cubemap.frag') diff --git a/pbr/2.1.1.ibl_irradiance_conversion/cubemap.frag b/pbr/2.1.1.ibl_irradiance_conversion/cubemap.frag new file mode 100644 index 0000000..349347a --- /dev/null +++ b/pbr/2.1.1.ibl_irradiance_conversion/cubemap.frag @@ -0,0 +1,25 @@ +#version 330 core + +in vert_t { + vec3 position; +} vert; + +out vec4 frag_color; + +uniform sampler2D map; + +const vec2 inv_atan = vec2(0.1591, 0.3183); +vec2 sample_spherical_map(vec3 v) +{ + vec2 uv = vec2(atan(v.z, v.x), asin(v.y)); + uv *= inv_atan; + uv += 0.5; + return uv; +} + +void main(void) +{ + vec2 uv = sample_spherical_map(normalize(vert.position)); + vec3 color = texture(map, uv).rgb; + frag_color = vec4(color, 1.0); +} -- cgit v1.2.3-70-g09d2