qzdoom/src/posix/sdl/gl_sysfb.h

#ifndef __POSIX_SDL_GL_SYSFB_H__
#define __POSIX_SDL_GL_SYSFB_H__

#include <SDL.h>

#include "v_video.h"

class SystemGLFrameBuffer : public DFrameBuffer
{
	typedef DFrameBuffer Super;

public:
	// this must have the same parameters as the Windows version, even if they are not used!
	SystemGLFrameBuffer (void *hMonitor, bool fullscreen);
	~SystemGLFrameBuffer ();

	void ForceBuffering (bool force);

	bool IsFullscreen ();

	virtual void SetVSync( bool vsync );
	void SwapBuffers();
	
	friend class SDLGLVideo;

	int GetClientWidth() override;
	int GetClientHeight() override;
	void ToggleFullscreen(bool yes) override;

	SDL_Window *GetSDLWindow() { return Screen; }

protected:
	void SetGammaTable(uint16_t *tbl);
	void ResetGammaTable();

	SystemGLFrameBuffer () {}
	uint8_t GammaTable[3][256];
	bool UpdatePending;

	SDL_Window *Screen;

	SDL_GLContext GLContext;

	void UpdateColors ();

	Uint16 m_origGamma[3][256];
	bool m_supportsGamma;
};

#endif // __POSIX_SDL_GL_SYSFB_H__