Cleaning up apu/ and renaming -private files to _flags.

Part of #296.

src/xenia/gpu/gl4/gl4_gpu_flags.cc

@@ -0,0 +1,29 @@
+/**
+ ******************************************************************************
+ * 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_flags.h"
+
+DEFINE_bool(thread_safe_gl, false,
+            "Only allow one GL context to be active at a time.");
+
+DEFINE_bool(disable_gl_context_reset, false,
+            "Do not aggressively reset the GL context (helps with capture "
+            "programs such as OBS or FRAPS).");
+
+DEFINE_bool(gl_debug, false, "Enable OpenGL debug validation layer.");
+DEFINE_bool(gl_debug_output, false, "Dump ARB_debug_output to stderr.");
+DEFINE_bool(gl_debug_output_synchronous, true,
+            "ARB_debug_output will synchronize to be thread safe.");
+
+DEFINE_bool(vendor_gl_extensions, false,
+            "Enable vendor-specific (NV, AMD, etc) GL extensions.");
+
+DEFINE_bool(disable_framebuffer_readback, false,
+            "Disable framebuffer readback.");
+DEFINE_bool(disable_textures, false, "Disable textures and use colors only.");