chore: add comment

galacean · Sep 4, 2023 · 014ec74 · 014ec74
1 parent c3c153d
commit 014ec74
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/packages/core/src/shaderlib/pbr/ibl_frag_define.glsl b/packages/core/src/shaderlib/pbr/ibl_frag_define.glsl
@@ -34,7 +34,7 @@ vec3 envBRDFApprox(vec3 specularColor,float roughness, float dotNV ) {
 
     vec2 AB = vec2( -1.04, 1.04 ) * a004 + r.zw;
 
-    // warning: (iPhone XS iOS 14.4) may return negative value.
+    // warning: add `max` because (iPhone XS iOS 14.4) may return negative value, refer to issue: https://github.com/galacean/engine/pull/1728
     return max(specularColor * AB.x + AB.y, 0.0);
 
 }