Move GL interface code out of the OpenGL video backend.

Source/Core/Common/GL/GLUtil.h

@@ -0,0 +1,33 @@
+// Copyright 2008 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "Common/MathUtil.h"
+#include "Common/GL/GLExtensions/GLExtensions.h"
+
+#ifndef _WIN32
+
+#include <sys/types.h>
+
+#endif
+void InitInterface();
+
+// Helpers
+GLuint OpenGL_CompileProgram(const char *vertexShader, const char *fragmentShader);
+
+// Creates and deletes a VAO and VBO suitable for attributeless rendering.
+// Called by the Renderer.
+void OpenGL_CreateAttributelessVAO();
+void OpenGL_DeleteAttributelessVAO();
+
+// Binds the VAO suitable for attributeless rendering.
+void OpenGL_BindAttributelessVAO();
+
+// this should be removed in future, but as long as glsl is unstable, we should really read this messages
+#if defined(_DEBUG) || defined(DEBUGFAST)
+#define DEBUG_GLSL 1
+#else
+#define DEBUG_GLSL 0
+#endif