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/*******************************************************************************************
*
* rPBR [shader] - Equirectangular to cubemap fragment shader
*
* Copyright (c) 2017 Victor Fisac
*
**********************************************************************************************/
#version 330
// Input vertex attributes (from vertex shader)
in vec3 fragPosition;
// Input uniform values
uniform sampler2D equirectangularMap;
// Output fragment color
out vec4 finalColor;
vec2 SampleSphericalMap(vec3 v)
{
vec2 uv = vec2(atan(v.z, v.x), asin(v.y));
uv *= vec2(0.1591, 0.3183);
uv += 0.5;
return uv;
}
void main()
{
// Normalize local position
vec2 uv = SampleSphericalMap(normalize(fragPosition));
// Fetch color from texture map
vec3 color = texture(equirectangularMap, uv).rgb;
// Calculate final fragment color
finalColor = vec4(color, 1.0);
}
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