// TnzCore includes

#include "texception.h"

#include "tvectorgl.h"

#include "tvectorimage.h"

#include "trasterimage.h"

#include "tgl.h"

#include "tthreadmessage.h"

#include "tsystem.h"

#include "trop.h"

// Platform-specific includes

#if defined(LINUX)

#include <x11 xlib.h=""></x11>

#include <gl glx.h=""></gl>

#include "xscopedlock.h"

#include "tthread.h"

#elif MACOSX

#include "qtofflinegl.h"

#endif

#include "tofflinegl.h"

#ifndef checkErrorsByGL

#define checkErrorsByGL                      \

	{                                        \

		GLenum err = glGetError();           \

		assert(err != GL_INVALID_ENUM);      \

		assert(err != GL_INVALID_VALUE);     \

		assert(err != GL_INVALID_OPERATION); \

		assert(err != GL_STACK_OVERFLOW);    \

		assert(err != GL_STACK_UNDERFLOW);   \

		assert(err != GL_OUT_OF_MEMORY);     \

		assert(err == GL_NO_ERROR);          \

	}

#endif

#undef checkErrorsByGL

#define checkErrorsByGL /**/

using namespace std;

TGLContextManager *currentContextManager = 0;

void TOfflineGL::setContextManager(TGLContextManager *contextManager)

{

	currentContextManager = contextManager;

	if (contextManager)

		contextManager->store();

}

//=============================================================================

// WIN32Implementation : implementazione offlineGL  WIN32

//-----------------------------------------------------------------------------

#ifdef _WIN32

namespace

{

//We found out that our implementation of win32 opengl contexts can be someway

//not thread-safe. Deadlocks and errors could happen for wgl* and GDI functions

//on particular configurations (notably, Windows 7). So we mutex them as

//a temporary workaround.

static QMutex win32ImpMutex;

}

//-------------------------------

class WIN32Implementation : public TOfflineGL::Imp

{

public:

	HDC m_offDC;

	HGDIOBJ m_oldobj;

	HGLRC m_hglRC;

	HBITMAP m_offDIB;

	void *m_offData;

	//-----------------------------------------------------------------------------

	WIN32Implementation(TDimension rasterSize, std::shared_ptr<tofflinegl::imp> shared)</tofflinegl::imp>

		: TOfflineGL::Imp(rasterSize.lx, rasterSize.ly)

	{

		m_offData = 0;

		createContext(rasterSize, std::move(shared)); //makeCurrent is called at the end of this

		glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

		glClear(GL_COLOR_BUFFER_BIT);

		doneCurrent(); //doneCurrent must therefore be called here

	}

	//-----------------------------------------------------------------------------

	~WIN32Implementation()

	{

		QMutexLocker locker(&win32ImpMutex);

		BOOL ret = wglMakeCurrent(m_offDC, NULL);

		assert(ret == TRUE);

		wglDeleteContext(m_hglRC);

		SelectObject(m_offDC, m_oldobj);

		DeleteObject(m_offDC);

		// si potrebbe passare un parametro che evita di distruggere la bitmap.

		// In tal caso il raster dovrebbe diventare owner del buffer, ma attualmente

		// questo non e' settabile in TRaster: quando gli si passa da fuori un buffer,

		// automaticamente bufferOwner viene settato a false e non e' modificabile!

		DeleteObject(m_offDIB);

	}

	//-----------------------------------------------------------------------------

	void makeCurrent()

	{

		QMutexLocker locker(&win32ImpMutex);

		int ret = wglMakeCurrent(m_offDC, m_hglRC);

		assert(ret == TRUE);

	}

	//-----------------------------------------------------------------------------

	void doneCurrent()

	{

		QMutexLocker locker(&win32ImpMutex);

		glFlush();

		glFinish();

		assert(glGetError() == 0);

		wglMakeCurrent(NULL, NULL);

	}

	//-----------------------------------------------------------------------------

	void initBITMAPINFO(BITMAPINFO &info, const TDimension rasterSize)

	{

		memset(&info, 0, sizeof(BITMAPINFOHEADER));

		info.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);

		info.bmiHeader.biWidth = rasterSize.lx;

		info.bmiHeader.biHeight = rasterSize.ly;

		info.bmiHeader.biPlanes = 1;

		info.bmiHeader.biBitCount = 32;

		info.bmiHeader.biCompression = BI_RGB;

		info.bmiHeader.biSizeImage = 0;

		info.bmiHeader.biXPelsPerMeter = 1000;

		info.bmiHeader.biYPelsPerMeter = 1000;

		info.bmiHeader.biClrUsed = 0;

		info.bmiHeader.biClrImportant = 0;

	}

	//-----------------------------------------------------------------------------

	void createContext(TDimension rasterSize, std::shared_ptr<tofflinegl::imp> shared)</tofflinegl::imp>

	{

		QMutexLocker locker(&win32ImpMutex);

		BITMAPINFO info;

		initBITMAPINFO(info, rasterSize);

		// open an offscreen device

		m_offDC = CreateCompatibleDC(NULL);

		// and a bitmap image

		m_offDIB = CreateDIBSection(m_offDC, &info, DIB_RGB_COLORS, &m_offData, NULL, 0);

		assert(m_offDIB);

		assert(m_offData);

		if (!m_offDIB || !m_offData)

			throw TException("cannot create OpenGL context. Check system resources!");

		int dataSize = rasterSize.lx * rasterSize.ly * 4; // number of byte of raster

		memset(m_offData, 0, dataSize);

		m_oldobj = SelectObject(m_offDC, m_offDIB); // select BIB to write

		static PIXELFORMATDESCRIPTOR pfd =

			{

				sizeof(PIXELFORMATDESCRIPTOR),																						 // size of this pfd

				1,																													 // version number

				0 | (false ? (PFD_DRAW_TO_WINDOW | PFD_DOUBLEBUFFER) : (PFD_DRAW_TO_BITMAP | PFD_SUPPORT_GDI)) | PFD_SUPPORT_OPENGL, // support OpenGL

				PFD_TYPE_RGBA,																										 // RGBA type

				32,																													 // 32-bit color depth

				0, 0, 0, 0, 0, 0,																									 // color bits ignored

				8,																													 // no alpha buffer /*===*/

				0,																													 // shift bit ignored

				0,																													 // no accumulation buffer

				0, 0, 0, 0,																											 // accum bits ignored

				32,																													 // 32-bit z-buffer

				32,																													 // max stencil buffer

				0,																													 // no auxiliary buffer

				PFD_MAIN_PLANE,																										 // main layer

				0,																													 // reserved

				0, 0, 0																												 // layer masks ignored

			};

		// get the best available match of pixel format for the device context

		int iPixelFormat = ChoosePixelFormat(m_offDC, &pfd);

		assert(iPixelFormat != 0);

		// make that the pixel format of the device context

		int ret = SetPixelFormat(m_offDC, iPixelFormat, &pfd);

		assert(ret == TRUE);

		// make a valid context for OpenGL rendering

		m_hglRC = wglCreateContext(m_offDC);

		assert(m_hglRC);

		if (!m_hglRC)

			throw TException("cannot create OpenGL context. Check system resources!");

		if (shared) {

			// Share shared's display lists

			const WIN32Implementation *sharedImp = dynamic_cast<const *="" win32implementation="">(shared.get());</const>

			assert(sharedImp);

			bool ok = wglShareLists(sharedImp->m_hglRC, m_hglRC);

			assert(ok);

		}

		ret = wglMakeCurrent(m_offDC, m_hglRC);

		assert(ret == TRUE);

	}

	//-----------------------------------------------------------------------------

	void swapRedBlueChannels(void *buffer, int bufferSize) // Flips The Red And Blue Bytes (WidthxHeight)

	{

		void *b = buffer; // Pointer To The Buffer

#ifdef x64

		int size = bufferSize;

		UCHAR *pix = (UCHAR *)b;

		while (size > 0) {

			UCHAR r = *pix;

			UCHAR b = *(pix + 2);

			*pix = b;

			*(pix + 2) = r;

			pix += 4;

			size--;

		}

/*unsigned long ebx = (unsigned long)b;

	  while(size>0)

	  {

	    unsigned char al =__readgsbyte(ebx);

		unsigned char ah =__readgsbyte(ebx+2);

		__writegsbyte(ebx+2,al);

		__writegsbyte(ebx,ah);

		ebx+=4;

	    size--;

	  }*/

#else

		__asm		  // Assembler Code To Follow

		{

        mov ecx, bufferSize // Counter Set To Dimensions Of Our Memory Block

        mov ebx, b // Points ebx To Our Data (b)

        label: // Label Used For Looping

          mov al,[ebx+0] // Loads Value At ebx Into al

          mov ah,[ebx+2] // Loads Value At ebx+2 Into ah

          mov [ebx+2],al // Stores Value In al At ebx+2

          mov [ebx+0],ah // Stores Value In ah At ebx

          add ebx,4 // Moves Through The Data By 4 Bytes

          dec ecx // Decreases Our Loop Counter

          jnz label // If Not Zero Jump Back To Label

		}

#endif

	}

	//-----------------------------------------------------------------------------

	void getRaster(TRaster32P raster)

	{

		makeCurrent();

		glFlush();

		int lx = raster->getLx();

		int ly = raster->getLy();

		raster->lock();

		glReadPixels(0, 0, lx, ly,

					 GL_RGBA /*GL_BGRA_EXT*/, GL_UNSIGNED_BYTE,

					 raster->getRawData());

		swapRedBlueChannels(raster->getRawData(), lx * ly);

		raster->unlock();

	}

};

// default imp generator

std::shared_ptr<tofflinegl::imp> defaultOfflineGLGenerator(const TDimension &dim, std::shared_ptr<tofflinegl::imp> shared)</tofflinegl::imp></tofflinegl::imp>

{

	return std::make_shared<win32implementation>(dim, shared);</win32implementation>

}

//=============================================================================

// XImplementation : implementazione offlineGL  Server X (MACOSX & LINUX)

//-----------------------------------------------------------------------------

#elif defined(LINUX)

class XImplementation : public TOfflineGL::Imp

{

public:

	Display *m_dpy;

	GLXContext m_context;

	GLXPixmap m_pixmap;

	Pixmap m_xpixmap;

	//-----------------------------------------------------------------------------

	XImplementation(TDimension rasterSize)

	{

		createContext(rasterSize);

		glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

		glClear(GL_COLOR_BUFFER_BIT);

	}

	//-----------------------------------------------------------------------------

	~XImplementation()

	{

		glXDestroyContext(m_dpy, m_context);

		m_context = 0;

		safeGlXMakeCurrent(true);

		XCloseDisplay(m_dpy);

	}

	//-----------------------------------------------------------------------------

	bool safeGlXMakeCurrent(bool isDtor = false)

	{

		static std::map<pthread_t, glxcontext=""> m_glxContext;</pthread_t,>

		static TThread::Mutex mutex;

		QMutexLocker sl(&mutex);

		pthread_t self = pthread_self();

		std::map<pthread_t, glxcontext="">::iterator it = m_glxContext.find(self);</pthread_t,>

		if (((it != m_glxContext.end()) && (it->second != m_context)) || (it == m_glxContext.end())) {

			//	cout << "calling GLXMakeCurrent " << self << " " << m_context << endl;

			Bool ret;

			if (!isDtor)

				ret = glXMakeCurrent(m_dpy, m_pixmap, m_context);

			m_glxContext[self] = m_context;

			return ret;

		}

		// cout << "don't call GLXMakeCurrent " << self << " " << m_context << endl;

		return true;

	}

	//-----------------------------------------------------------------------------

	void makeCurrent()

	{

		XScopedLock xsl;

		//Bool ret = glXMakeCurrent(m_dpy,m_pixmap,m_context);

		Bool ret = safeGlXMakeCurrent();

		assert(ret == True);

	}

	//-----------------------------------------------------------------------------

	// DA IMPLEMENTARE !!!

	void doneCurrent()

	{

	}

	//-----------------------------------------------------------------------------

	void createContext(TDimension rasterSize)

	{

		m_dpy = XOpenDisplay(NULL);

		Window win = DefaultRootWindow(m_dpy);

		int attribList[] = {

			GLX_RGBA,

			GLX_RED_SIZE, 1,

			GLX_GREEN_SIZE, 1,

			GLX_BLUE_SIZE, 1,

			//    			GLX_ALPHA_SIZE,  1,

			GLX_STENCIL_SIZE, 8,

			//			GLX_DEPTH_SIZE,  24,

			None};

		int dbAttrib[] = {GLX_RGBA,

						  GLX_RED_SIZE, 1,

						  GLX_GREEN_SIZE, 1,

						  GLX_BLUE_SIZE, 1,

						  GLX_STENCIL_SIZE, 8,

						  GLX_DOUBLEBUFFER,

						  None};

		int w = rasterSize.lx;

		int h = rasterSize.ly;

		XVisualInfo *vis = glXChooseVisual(m_dpy, DefaultScreen(m_dpy), attribList);

		if (!vis) {

			std::cout << "unable to create sb visual" << std::endl;

			vis = glXChooseVisual(m_dpy, DefaultScreen(m_dpy), dbAttrib);

			assert(vis && "unable to create db visual");

		}

		m_context = glXCreateContext(m_dpy, vis, 0, False);

		//    std::cout << "Direct rendering: " << (glXIsDirect(m_dpy, m_context) ? "Yes" : "No" )<< std::endl;

		if (!m_context)

			assert("not m_context" && false);

		TRaster32P raster(w, h);

		m_xpixmap = XCreatePixmap(m_dpy, win, w, h, vis->depth);

		assert(m_xpixmap && "not m_xpixmap");

		m_pixmap = glXCreateGLXPixmap(m_dpy, vis, m_xpixmap);

		if (!m_pixmap)

			assert("not m_pixmap" && m_pixmap);

		/*

    Bool ret = glXMakeCurrent(m_dpy, 

			      m_pixmap, 

			      m_context);

*/

		Bool ret = safeGlXMakeCurrent();

		assert(ret);

		m_raster = raster;

	}

//-----------------------------------------------------------------------------

#if defined(MACOSX)

#if defined(powerpc)

	void rightRotateBits(UCHAR *buf, int bufferSize)

	{

		UINT *buffer = (UINT *)buf;

		UINT app;

		for (int i = 0; i < bufferSize; i++, buffer++) {

			app = *buffer;

			*buffer = app >> 8 | app << 24;

		}

	}

#else

	void rightRotateBits(UCHAR *buf, int bufferSize)

	{

		UINT *buffer = (UINT *)buf;

		UINT app;

		for (int i = 0; i < bufferSize; i++, buffer++) {

			app = *buffer;

			*buffer = (app >> 16 & 0x000000ff) | (app << 16 & 0x00ff0000) | (app & 0xff00ff00);

		}

	}

#endif

#endif

	//-----------------------------------------------------------------------------

	const TRaster32P &getRaster()

	{

		makeCurrent();

		glFlush();

		int lx = m_raster->getLx();

		int ly = m_raster->getLy();

		m_raster->lock();

		glReadPixels(0, 0, lx, ly,

					 GL_RGBA /*GL_BGRA_EXT*/, GL_UNSIGNED_BYTE,

					 m_raster->getRawData());

#if defined(MACOSX)

		rightRotateBits(m_raster->getRawData(), lx * ly);

#warning "to do"

#endif

		m_raster->unlock();

		return m_raster;

	}

	//-----------------------------------------------------------------------------

	int getLx() const

	{

		return m_raster->getLx();

	}

	//-----------------------------------------------------------------------------

	int getLy() const

	{

		return m_raster->getLy();

	}

};

std::shared_ptr<tofflinegl::imp> defaultOfflineGLGenerator(const TDimension &dim, std::shared_ptr<tofflinegl::imp> shared)</tofflinegl::imp></tofflinegl::imp>

{

	return std::make_shared<ximplementation>(dim);</ximplementation>

}

#elif MACOSX

std::shared_ptr<tofflinegl::imp> defaultOfflineGLGenerator(const TDimension &dim, std::shared_ptr<tofflinegl::imp> shared)</tofflinegl::imp></tofflinegl::imp>

{

	return std::make_shared<qtofflinegl>(dim, shared);</qtofflinegl>

}

#endif

//=============================================================================

//-----------------------------------------------------------------------------

// current imp generator

namespace

{

TOfflineGL::ImpGenerator *currentImpGenerator = defaultOfflineGLGenerator;

} // namespace

//=============================================================================

// TOfflineGL

//-----------------------------------------------------------------------------

//namespace {

class MessageCreateContext : public TThread::Message

{

	friend class TOfflineGL;

	TOfflineGL *m_ogl;

	TDimension m_size;

	std::shared_ptr<tofflinegl::imp> m_shared;</tofflinegl::imp>

public:

	MessageCreateContext(TOfflineGL *ogl, const TDimension &size, std::shared_ptr<tofflinegl::imp> shared)</tofflinegl::imp>

		: m_ogl(ogl), m_size(size), m_shared(std::move(shared)) {}

	void onDeliver()

	{

		m_ogl->m_imp = currentImpGenerator(m_size, m_shared);

	}

	TThread::Message *clone() const

	{

		return new MessageCreateContext(*this);

	}

};

//} // namespace

//--------------------------------------------------

TOfflineGL::TOfflineGL(TDimension dim, const TOfflineGL *shared)

{

#if defined(LINUX)

	XScopedLock xsl;

#endif

	std::shared_ptr<imp> sharedImp = shared ? shared->m_imp : 0;</imp>

	/*

	元のコードは(別スレッドから呼び出すための) offline renderer を作って main thread に dispatch するという訳のわからないことをしていたが Q*GLContext は thread context を超えられないので直接生成してこのコンテキストで閉じる.

	別スレッドには dispatch しない.

   */

	m_imp = currentImpGenerator(dim, std::move(sharedImp));

	initMatrix();

}

//-----------------------------------------------------------------------------

TOfflineGL::TOfflineGL(const TRaster32P &raster, const TOfflineGL *shared)

{

#if defined(LINUX)

	XScopedLock xsl;

#endif

	m_imp = currentImpGenerator(raster->getSize(), shared->m_imp);

	initMatrix();

	glRasterPos2d(0, 0);

	raster->lock();

	glDrawPixels(raster->getLx(), raster->getLy(), GL_BGRA_EXT, GL_UNSIGNED_BYTE, raster->getRawData());

	raster->unlock();

}

//-----------------------------------------------------------------------------

TOfflineGL::~TOfflineGL()

{

}

//-----------------------------------------------------------------------------

TOfflineGL::ImpGenerator *TOfflineGL::defineImpGenerator(TOfflineGL::ImpGenerator *impGenerator)

{

	TOfflineGL::ImpGenerator *ret = currentImpGenerator;

	currentImpGenerator = impGenerator;

	return ret;

}

//-----------------------------------------------------------------------------

void TOfflineGL::makeCurrent()

{

	if (currentContextManager)

		currentContextManager->store();

	// Tutto il codice è stato spostato dentro Imp

	m_imp->makeCurrent();

	assert(glGetError() == GL_NO_ERROR);

}

//-----------------------------------------------------------------------------

void TOfflineGL::doneCurrent()

{

	m_imp->doneCurrent();

	if (currentContextManager) {

		currentContextManager->restore();

	}

}

//-----------------------------------------------------------------------------

void TOfflineGL::initMatrix()

{

	m_imp->makeCurrent();

	// cfr. help: OpenGL/Programming tip/OpenGL Correctness Tips

	glViewport(0, 0, m_imp->getLx(), m_imp->getLy());

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	gluOrtho2D(0, m_imp->getLx(), 0, m_imp->getLy());

	glMatrixMode(GL_MODELVIEW);

	glLoadIdentity();

	//glTranslatef(0.375, 0.375, 0.0);    //WRONG

	/*  (From Daniele)

Quoting from the aforementioned source:

"An optimum compromise that allows all primitives to be specified at integer 

positions, while still ensuring predictable rasterization, is to translate x 

and y by 0.375, as shown in the following code sample. Such a translation 

keeps polygon and pixel image edges safely away from the centers of pixels, 

while moving line vertices close enough to the pixel centers"

    NOTE: This is not an acceptable excuse in our case - as we're NOT USING

          INTEGER COORDINATES ONLY. OpenGL has all the rights to render pixels

          at integer coordinates across the neighbouring 4 pixels - and their

          (0.5, 0.5) translations at the EXACT screen pixel.

  */

}

//-----------------------------------------------------------------------------

void TOfflineGL::clear(TPixel32 color)

{

	const double maxValue = 255.0;

	makeCurrent();

	glClearColor(

		(double)color.r / maxValue,

		(double)color.g / maxValue,

		(double)color.b / maxValue,

		(double)color.m / maxValue);

	glClear(GL_COLOR_BUFFER_BIT);

}

//-----------------------------------------------------------------------------

void TOfflineGL::draw(TVectorImageP image, const TVectorRenderData &rd, bool doInitMatrix)

{

	checkErrorsByGL;

	makeCurrent();

	checkErrorsByGL;

	if (doInitMatrix) {

		initMatrix();

		checkErrorsByGL;

	}

	if (image) {

		checkErrorsByGL;

		tglDraw(rd, image.getPointer());

		checkErrorsByGL;

	}

	checkErrorsByGL;

	glFlush();

	checkErrorsByGL;

}

//-----------------------------------------------------------------------------

void TOfflineGL::draw(TRasterImageP ri, const TAffine &aff, bool doInitMatrix)

{

	makeCurrent();

	if (doInitMatrix)

		initMatrix();

	TRaster32P ras32 = ri->getRaster();

	if (!ras32)

		return;

	int lx = ras32->getLx();

	int ly = ras32->getLy();

	// lx e ly devono essere potenze di due

	assert((lx & (lx - 1)) == 0);

	assert((ly & (ly - 1)) == 0);

	glPushMatrix();

	tglMultMatrix(aff);

	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

	glTexEnvf(GL_TEXTURE_ENV,

			  GL_TEXTURE_ENV_MODE,

			  GL_DECAL);

	glEnable(GL_TEXTURE_2D);

	/*

  TNZ_MACHINE_CHANNEL_ORDER_BGRM

  TNZ_MACHINE_CHANNEL_ORDER_MBGR

  TNZ_MACHINE_CHANNEL_ORDER_RGBM

  TNZ_MACHINE_CHANNEL_ORDER_MRGB

  */

	GLenum fmt = TGL_FMT;

	/*

 #ifdef TNZ_MACHINE_CHANNEL_ORDER_BGRM

 GL_BGRA_EXT;

 #elif TNZ_MACHINE_CHANNEL_ORDER_MBGR

 GL_ABGR_EXT;

 #elif TNZ_MACHINE_CHANNEL_ORDER_RGBM

 GL_RGBA;

 #elif TNZ_MACHINE_CHANNEL_ORDER_MRGB

 #warning "to do"

 GL_ABGR_EXT;

 #else

 Error  PLATFORM NOT SUPPORTED

 #endif

*/

	// Generate a texture id and bind it.

	GLuint texId;

	glGenTextures(1, &texId);

	glBindTexture(GL_TEXTURE_2D, texId);

	glPixelStorei(GL_UNPACK_ROW_LENGTH,

				  ras32->getWrap() != ras32->getLx() ? ras32->getWrap() : 0);

	ras32->lock();

	glTexImage2D(

		GL_TEXTURE_2D, // target (is a 2D texture)

		0,			   // is one level only

		GL_RGB,		   //  number of component of a pixel

		lx,			   // size width

		ly,			   //      height

		0,			   // size of a border

		fmt,

		GL_UNSIGNED_BYTE, //

		ras32->getRawData());

	ras32->unlock();

	double halfWidth = 0.5 * lx;

	double halfHeight = 0.5 * ly;

	double dpix = 1, dpiy = 1;

	ri->getDpi(dpix, dpiy);

	if (dpix != 0 && dpiy != 0) {

		double unit = 100;

		halfWidth *= unit / dpix;

		halfHeight *= unit / dpiy;

	}

	glBegin(GL_QUAD_STRIP);

	glTexCoord2d(0, 0);

	glVertex2d(-halfWidth, -halfHeight);

	glTexCoord2d(1, 0);

	glVertex2d(halfWidth, -halfHeight);

	glTexCoord2d(0, 1);

	glVertex2d(-halfWidth, halfHeight);

	glTexCoord2d(1, 1);

	glVertex2d(halfWidth, halfHeight);

	glEnd();

	glDisable(GL_TEXTURE_2D);

	glPopMatrix();

	glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);

	// Delete texture

	glDeleteTextures(1, &texId);

	glFlush();

}

//-----------------------------------------------------------------------------

void TOfflineGL::flush()

{

	makeCurrent();

	glFlush();

}

//-----------------------------------------------------------------------------

void TOfflineGL::getRaster(TRaster32P raster)

{

	assert(raster->getLx() <= getLx() && raster->getLy() <= getLy());

	if (raster->getWrap() == raster->getLx()) {

		m_imp->getRaster(raster);

	} else {

		//There are 2 possible solutions: use glReadPixels multiple times for each row of input raster,

		//OR allocate a new contiguous buffer, use glReadPixels once, and then memcpy each row.

		//It actually seems that the *latter* is actually the fastest solution, although it requires

		//allocating a temporary buffer of the same size of the requested raster...

		//I also could not actually manage to make the former work - the code seemed right but results were weird...

		TRaster32P ras32(raster->getSize());

		m_imp->getRaster(ras32);

		TRop::copy(raster, ras32);

	}

}

//-----------------------------------------------------------------------------

void TOfflineGL::getRaster(TRasterP raster)

{

	assert(raster->getLx() <= getLx() && raster->getLy() <= getLy());

	TRaster32P ras32 = raster;

	if (ras32 && (raster->getWrap() == raster->getLx())) {

		m_imp->getRaster(ras32);

	} else {

		ras32 = TRaster32P(raster->getSize());

		m_imp->getRaster(ras32);

		TRop::copy(raster, ras32);

	}

}

//-----------------------------------------------------------------------------

TRaster32P TOfflineGL::getRaster()

{

	TRaster32P raster(getLx(), getLy());

	m_imp->getRaster(raster);

	return raster;

}

//-----------------------------------------------------------------------------

int TOfflineGL::getLx() const

{

	return m_imp->getLx();

}

//-----------------------------------------------------------------------------

int TOfflineGL::getLy() const

{

	return m_imp->getLy();