From 3d9ee4072dd829350c60c9c31535bdc6e2d9b789 Mon Sep 17 00:00:00 2001
From: Brad Linden <46733234+brad-linden@users.noreply.github.com>
Date: Tue, 26 Nov 2024 13:33:44 -0800
Subject: [PATCH] fix GL3 fallback on mac intel gpu systems.
 secondlife/viewer#3145 (#3159)

---
 indra/newview/llfeaturemanager.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/indra/newview/llfeaturemanager.cpp b/indra/newview/llfeaturemanager.cpp
index 7e52b4afc0..2ad1257695 100644
--- a/indra/newview/llfeaturemanager.cpp
+++ b/indra/newview/llfeaturemanager.cpp
@@ -655,8 +655,16 @@ void LLFeatureManager::applyBaseMasks()
     if (gGLManager.mIsIntel)
     {
         maskFeatures("Intel");
+
+        static constexpr F32 TARGET_GL_VERSION =
+#if LL_DARWIN
+            4.09f;
+#else
+            4.59f;
+#endif
+
         // check against 3.33 to avoid applying this fallback twice
-        if (gGLManager.mGLVersion < 4.59f && gGLManager.mGLVersion > 3.33f)
+        if (gGLManager.mGLVersion < TARGET_GL_VERSION && gGLManager.mGLVersion > 3.33f)
         {
             // if we don't have OpenGL 4.6 on intel, set it to OpenGL 3.3
             // we also want to trigger the GL3 fallbacks on these chipsets