From 2ab39850197036f16148a02babf528bc12c07ea5 Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Fri, 24 Oct 2025 14:51:09 -0700
Subject: More references

---
 shaders/cook_torrance.frag | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/shaders/cook_torrance.frag b/shaders/cook_torrance.frag
index 74a89e2..9ff5a8d 100644
--- a/shaders/cook_torrance.frag
+++ b/shaders/cook_torrance.frag
@@ -1,5 +1,7 @@
 /*
 [1] BRDF reference: https://graphicrants.blogspot.com/2013/08/specular-brdf-reference.html
+[2] glTF reference implementation: https://github.com/KhronosGroup/glTF-Sample-Renderer/blob/main/source/Renderer/shaders/brdf.glsl
+[3] Learn OpenGL reference: https://learnopengl.com/PBR/Theory (see other chapters also for IBL)
 */
 precision highp float;
 
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