From 0d819f2b9a71e862bce8799c6b0c1304e62219b3 Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Fri, 22 Aug 2025 12:24:05 +0200
Subject: [add]: add HDRI

---
 Assets/Shaders/EquirectToCubemap.glsl | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 Assets/Shaders/EquirectToCubemap.glsl

(limited to 'Assets/Shaders/EquirectToCubemap.glsl')

diff --git a/Assets/Shaders/EquirectToCubemap.glsl b/Assets/Shaders/EquirectToCubemap.glsl
new file mode 100644
index 0000000..2b99c9b
--- /dev/null
+++ b/Assets/Shaders/EquirectToCubemap.glsl
@@ -0,0 +1,33 @@
+#type vertex
+
+#version 330 core
+layout (location = 0) in vec3 aPos;
+out vec3 WorldPos;
+uniform mat4 projection;
+uniform mat4 view;
+void main()
+{
+    WorldPos = aPos;
+    gl_Position = projection * view * vec4(WorldPos, 1.0);
+}
+
+#type fragment
+
+#version 330 core
+out vec4 FragColor;
+in vec3 WorldPos;
+uniform sampler2D equirectangularMap;
+const vec2 invAtan = vec2(0.1591, 0.3183);
+vec2 SampleSphericalMap(vec3 v)
+{
+    vec2 uv = vec2(atan(v.z, v.x), asin(v.y));
+    uv *= invAtan;
+    uv += 0.5;
+    return uv;
+}
+void main()
+{
+    vec2 uv = SampleSphericalMap(normalize(WorldPos));
+    vec3 color = texture(equirectangularMap, uv).rgb;
+    FragColor = vec4(color, 1.0);
+}
-- 
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