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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef _OFFSCREENGLCONTEXT_H
#define _OFFSCREENGLCONTEXT_H
#include "Rendering/GL/myGL.h"
#include <functional>
#if defined(HEADLESS)
//! nothing
#elif defined(WIN32)
#include "System/Platform/Win/win32.h"
#elif defined(__APPLE__)
#include <OpenGL/CGLTypes.h>
#else
#include <GL/glx.h>
#include <X11/Xlib.h>
#undef KeyPress
#undef KeyRelease
#undef GrayScale
#endif
#include "System/Threading/SpringThreading.h"
#include <chrono>
class COffscreenGLContext
{
public:
//! Note: the functions are sorted in the way they should be called
COffscreenGLContext();
virtual ~COffscreenGLContext();
void WorkerThreadPost();
void WorkerThreadFree(); //! must run in the same thread as the offscreen GL context!
private:
#ifdef HEADLESS
//! nothing
#elif WIN32
HDC hdc;
HGLRC offscreenRC;
#elif __APPLE__
CGLContextObj cglWorkerCtx;
#else
Display* display;
GLXPbuffer pbuf;
GLXContext workerCtx;
#endif
};
/******************************************************************************/
/**
* @brief COffscreenGLThread
* Runs a std::bind in an additional thread with an offscreen OpenGL context.
* (Don't try render to the 'screen' a.k.a. default framebuffer in that thread, the results will be undetermistic)
*/
class COffscreenGLThread
{
public:
COffscreenGLThread(std::function<void()> f);
~COffscreenGLThread();
void Join();
void join() {Join();}
private:
void WrapFunc(std::function<void()> f);
spring::thread* thread;
COffscreenGLContext glOffscreenCtx;
};
#endif // _OFFSCREENGLCONTEXT_H
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