Merge pull request #1595 from degasus/master

OGL: require GL version >= 3.0

Source/Core/VideoBackends/OGL/Render.cpp

@@ -447,13 +447,20 @@ Renderer::Renderer()
 		bSuccess = false;
 	}
 
-	if (!GLExtensions::Supports("GL_ARB_sampler_objects") && bSuccess)
+	if (!GLExtensions::Supports("GL_ARB_sampler_objects"))
 	{
 		// Our sampler cache uses this extension. It could easyly be workaround and it's by far the
 		// highest requirement, but it seems that no driver lacks support for it.
-		PanicAlert("GPU: OGL ERROR: Need GL_ARB_sampler_objects."
-				"GPU: Does your video card support OpenGL 3.3?"
-				"Please report this issue, then there will be a workaround");
+		PanicAlert("GPU: OGL ERROR: Need GL_ARB_sampler_objects.\n"
+				"GPU: Does your video card support OpenGL 3.3?");
+		bSuccess = false;
+	}
+
+	if (GLExtensions::Version() < 300)
+	{
+		// integer vertex attributes require a gl3 only function
+		PanicAlert("GPU: OGL ERROR: Need OpenGL version 3.\n"
+				"GPU: Does your video card support OpenGL 3?");
 		bSuccess = false;
 	}