SDL2 / Rift Direct HMD / GL Context Troubles

gistfile1.c

#define GLEW_STATIC
#include "GL/glew.h"
// Uncomment your platform
#define OVR_OS_WIN32
//#define OVR_OS_MAC
//#define OVR_OS_LINUX
#include "OVR_CAPI_GL.h"
#include "Kernel/OVR_Math.h"
#include "SDL.h"
#include "SDL_syswm.h"

using namespace OVR;

int main(int argc, char *argv[])
{
	SDL_Init(SDL_INIT_VIDEO);

	int x = SDL_WINDOWPOS_CENTERED;
	int y = SDL_WINDOWPOS_CENTERED;

	Uint32 flags = SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN;

	bool debug = false;

	ovr_Initialize();

	ovrHmd hmd = ovrHmd_Create(0);

	if (hmd == NULL)
	{
		hmd = ovrHmd_CreateDebug(ovrHmd_DK1);

		debug = true;
	}

	if (debug == false)
	{
		x = hmd->WindowsPos.x;
		y = hmd->WindowsPos.y;
		flags |= SDL_WINDOW_FULLSCREEN_DESKTOP;
	}

	int w = hmd->Resolution.w;
	int h = hmd->Resolution.h;

	SDL_Window *window = SDL_CreateWindow("Oculus Rift SDL2 OpenGL Demo", x, y, w, h, flags);

	SDL_GLContext context = SDL_GL_CreateContext(window);

	glewExperimental = GL_TRUE;

	glewInit();         

	SDL_SysWMinfo info;
	SDL_VERSION(&info.version);

	SDL_GetWindowWMInfo(window, &info);

#if defined(OVR_OS_WIN32)
	if (!(hmd->HmdCaps & ovrHmdCap_ExtendDesktop))
		ovrHmd_AttachToWindow(hmd, info.info.win.window, NULL, NULL); 
#endif

	glClearColor(1.0,1.0,1.0,1.0);  

	bool running = true;

	while (running == true)
	{
		SDL_Event event;

		while (SDL_PollEvent(&event))
		{
			switch (event.type)
			{
			case SDL_QUIT:
				running = false;
				break;
			case SDL_KEYDOWN:

				switch (event.key.keysym.sym)
				{
				case SDLK_ESCAPE:
					running = false;
					break;
				default:
					break;
				}
				break;
			default:
				break;
			}
		}

		// ovrFrameTiming frameTiming = ovrHmd_BeginFrameTiming(hmd, 0);
	
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

		// ovrHmd_EndFrameTiming(hmd);

		SDL_GL_SwapWindow(window);
	}

	SDL_GL_DeleteContext(context);

	SDL_DestroyWindow(window);

	ovrHmd_Destroy(hmd);

	ovr_Shutdown();

	SDL_Quit();

	return 0;
}