message: Add warning if some required extensions are missing
diff: @@ -793,6 +793,8 @@ void GLReplay::InitDebugData()
  if(!HasExt[ARB_shader_image_load_store] || !HasExt[ARB_compute_shader])
  {
  + RDCWARN(
  + "Don't have shader image load/store or compute shaders, functionality will be degraded.");
  m_Degraded = true;
  }
  }
  