Disable old mac opengl hacks on apple silicon

Author: Rye

indra/llrender/llglslshader.cpp

@@ -421,8 +421,11 @@ bool LLGLSLShader::createShader()
     llassert_always(!mShaderFiles.empty());
 
 #if LL_DARWIN
-    // work-around missing mix(vec3,vec3,bvec3)
-    mDefines["OLD_SELECT"] = "1";
+    if(!gGLManager.mIsApple)
+    {
+        // work-around missing mix(vec3,vec3,bvec3)
+        mDefines["OLD_SELECT"] = "1";
+    }
 #endif
 
     mShaderHash = hash();

indra/llrender/llshadermgr.cpp

@@ -450,7 +450,7 @@ GLuint LLShaderMgr::loadShaderFile(const std::string& filename, S32 & shader_lev
 
 // endsure work-around for missing GLSL funcs gets propogated to feature shader files (e.g. srgbF.glsl)
 #if LL_DARWIN
-    if (defines)
+    if (defines && !gGLManager.mIsApple)
     {
         (*defines)["OLD_SELECT"] = "1";
     }

indra/newview/pipeline.cpp

@@ -1423,9 +1423,12 @@ void LLPipeline::createLUTBuffers()
 
         U32 pix_format = GL_R16F;
 #if LL_DARWIN
-        // Need to work around limited precision with 10.6.8 and older drivers
-        //
-        pix_format = GL_R32F;
+        if(!gGLManager.mIsApple)
+        {
+            // Need to work around limited precision with 10.6.8 and older drivers
+            //
+            pix_format = GL_R32F;
+        }
 #endif
         LLImageGL::generateTextures(1, &mLightFunc);
         gGL.getTexUnit(0)->bindManual(LLTexUnit::TT_TEXTURE, mLightFunc);