Main window, empty GPU files.

src/xenia/gpu/gl4/gl4_gpu.cc

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+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2014 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include <xenia/gpu/gl4/gl4_gpu.h>
+
+//#include <xenia/gpu/gl4/gl4_graphics_system.h>
+
+namespace xe {
+namespace gpu {
+namespace gl4 {
+
+void InitializeIfNeeded();
+void CleanupOnShutdown();
+
+void InitializeIfNeeded() {
+  static bool has_initialized = false;
+  if (has_initialized) {
+    return;
+  }
+  has_initialized = true;
+
+  //
+
+  atexit(CleanupOnShutdown);
+}
+
+void CleanupOnShutdown() {}
+
+class GL4GraphicsSystem : public GraphicsSystem {
+ public:
+  GL4GraphicsSystem(Emulator* emulator) : GraphicsSystem(emulator) {}
+  ~GL4GraphicsSystem() override = default;
+};
+
+std::unique_ptr<GraphicsSystem> Create(Emulator* emulator) {
+  InitializeIfNeeded();
+  return std::make_unique<GL4GraphicsSystem>(emulator);
+}
+
+}  // namespace gl4
+}  // namespace gpu
+}  // namespace xe