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examples/models/resources/shaders/cubemap.fs

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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 fragPos
+
+# 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(fragPos))
+
+    # Fetch color from texture map
+    vec3 color = texture(equirectangularMap, uv).rgb
+
+    # Calculate final fragment color
+    finalColor = vec4(color, 1.0)
+]