Disable compute support on GL < 4.2. Closes #1591

renderdoc/driver/gl/gl_common.cpp

@@ -474,6 +474,12 @@ void FetchEnabledExtensions()
 
     HasExt[ARB_program_interface_query] = false;
   }
+
+  if(!IsGLES && GLCoreVersion < 42 && HasExt[ARB_compute_shader])
+  {
+    RDCERR("GL implementation has ARB_compute_shader but is not at least 4.2. Disabling compute.");
+    HasExt[ARB_compute_shader] = false;
+  }
 }
 
 void DoVendorChecks(GLPlatform &platform, GLWindowingData context)

renderdoc/driver/gl/gl_debug.cpp

@@ -762,13 +762,6 @@ void GLReplay::InitDebugData()
 
   RenderDoc::Inst().SetProgress(LoadProgress::DebugManagerInit, 0.6f);
 
-  if(HasExt[ARB_compute_shader] && !HasExt[ARB_shading_language_420pack])
-  {
-    RDCERR(
-        "GL implementation has ARB_compute_shader but not ARB_shading_language_420pack! "
-        "Compute shaders won't compile successfully.");
-  }
-
   // histogram/minmax data
   {
     RDCEraseEl(DebugData.minmaxTileProgram);