From 2f39d381efaa77f27f6daf10b782066e426872b6 Mon Sep 17 00:00:00 2001
From: Rye <rye@lindenlab.com>
Date: Sat, 16 Nov 2024 03:51:33 -0500
Subject: Restore support for anistropic filtering on macos

---
 indra/llrender/llgl.cpp     | 7 ++++++-
 indra/llrender/llrender.cpp | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/indra/llrender/llgl.cpp b/indra/llrender/llgl.cpp
index 1bc5e79835..008ee8d450 100644
--- a/indra/llrender/llgl.cpp
+++ b/indra/llrender/llgl.cpp
@@ -1266,7 +1266,7 @@ bool LLGLManager::initGL()
     // there's some implementation that reports a crazy value
     mMaxUniformBlockSize = llmin(mMaxUniformBlockSize, 65536);
 
-    if (mGLVersion >= 4.59f)
+    if (mHasAnisotropic)
     {
         glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY, &mMaxAnisotropy);
     }
@@ -1430,6 +1430,11 @@ void LLGLManager::initExtensions()
     mHasCubeMapArray = mGLVersion >= 3.99f;
     mHasTransformFeedback = mGLVersion >= 3.99f;
     mHasDebugOutput = mGLVersion >= 4.29f;
+    mHasAnisotropic = mGLVersion >= 4.59f;
+    if(!mHasAnisotropic && gGLHExts.mSysExts)
+    {
+        mHasAnisotropic = ExtensionExists("GL_EXT_texture_filter_anisotropic", gGLHExts.mSysExts);
+    }
 
     // Misc
     glGetIntegerv(GL_MAX_ELEMENTS_VERTICES, (GLint*) &mGLMaxVertexRange);
diff --git a/indra/llrender/llrender.cpp b/indra/llrender/llrender.cpp
index 1dc87a66ce..ec76aa4f36 100644
--- a/indra/llrender/llrender.cpp
+++ b/indra/llrender/llrender.cpp
@@ -511,7 +511,7 @@ void LLTexUnit::setTextureFilteringOption(LLTexUnit::eTextureFilterOptions optio
         }
     }
 
-    if (gGLManager.mGLVersion >= 4.59f)
+    if (gGLManager.mHasAnisotropic)
     {
         if (LLImageGL::sGlobalUseAnisotropic && option == TFO_ANISOTROPIC)
         {
-- 
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