src/projectM-iTunes-VizKit/source/VisualGraphicsCore.cpp - vendor/opensource/projectM - Git at Google

 /*
  * Project: VizKit
  * Version: 2.3

  * Date: 20090823
  * File: VisualGraphicsCore.cpp
  *
  */

 /***************************************************************************

 Copyright (c) 2004-2009 Heiko Wichmann (http://www.imagomat.de/vizkit)


 This software is provided 'as-is', without any expressed or implied warranty.
 In no event will the authors be held liable for any damages
 arising from the use of this software.

 Permission is granted to anyone to use this software for any purpose,
 including commercial applications, and to alter it and redistribute it
 freely, subject to the following restrictions:

 1. The origin of this software must not be misrepresented;
    you must not claim that you wrote the original software.
    If you use this software in a product, an acknowledgment
    in the product documentation would be appreciated
    but is not required.

 2. Altered source versions must be plainly marked as such,
    and must not be misrepresented as being the original software.

 3. This notice may not be removed or altered from any source distribution.

  ***************************************************************************/

 #include "VisualGraphicsCore.h"
 #include "VisualErrorHandling.h"

 #if TARGET_OS_WIN
 #include <stdio.h> // sprintf
 #endif


 #if TARGET_OS_WIN
 #include <GL/gl.h>
 #include <GL/glu.h>
 #endif


 using namespace VizKit;


 VisualGraphicsCore* VisualGraphicsCore::theVisualGraphicsCore = NULL;  // singleton


 VisualGraphicsCore::VisualGraphicsCore() {
 	ctx = NULL;
 #if TARGET_OS_MAC
 	directDisplayId = CGMainDisplayID();
 #endif
 #if TARGET_OS_WIN
 	windowDC = NULL;
 #endif
 }


 VisualGraphicsCore::~VisualGraphicsCore() {
 	// null
 }


 VisualGraphicsCore* VisualGraphicsCore::getInstance() {
     if (theVisualGraphicsCore == NULL) {
 		theVisualGraphicsCore = new VisualGraphicsCore;
     }
 	return theVisualGraphicsCore;
 }


 void VisualGraphicsCore::dispose() {
     if (theVisualGraphicsCore != NULL) {
         delete theVisualGraphicsCore;
 		theVisualGraphicsCore = NULL;
     }
 }


 bool VisualGraphicsCore::setupContext() {

 	bool success = true;
 	uint8 errNum = 0;
 	char errLog[256];

 #if TARGET_OS_MAC
 	errNum = theVisualGraphicsCore->setupAGL();
 	if (errNum != 0) {
 		sprintf(errLog, "error %d on setupAGL in file: %s (line: %d) [%s])", errNum, __FILE__, __LINE__, __FUNCTION__);
 		writeLog(errLog);
 		success = false;
 	}
 #endif

 #if TARGET_OS_WIN
 	errNum = theVisualGraphicsCore->setupWGL();
 	if (errNum != 0) {
 		sprintf(errLog, "error %d on setupWGL in file: %s (line: %d) [%s])", errNum, __FILE__, __LINE__, __FUNCTION__);
 		writeLog(errLog);
 		success = false;
 	}
 #endif

 	return success;
 }


 #if TARGET_OS_MAC
 uint8 VisualGraphicsCore::setupAGL() {
     GLboolean ok;

 	GLint attrib[] = {AGL_RGBA, AGL_RED_SIZE, 8, AGL_GREEN_SIZE, 8, AGL_BLUE_SIZE, 8, AGL_ALPHA_SIZE, 8, AGL_ACCELERATED, AGL_DOUBLEBUFFER, AGL_DEPTH_SIZE, 24, AGL_CLOSEST_POLICY, AGL_NONE};

     AGLPixelFormat fmt = aglChoosePixelFormat(NULL, 0, attrib);

     if (fmt == NULL) {
         return 1;
     }

     theVisualGraphicsCore->ctx = aglCreateContext(fmt, NULL);
     if (theVisualGraphicsCore->ctx == NULL) {
         return 2;
     }

 	ok = aglSetDrawable(theVisualGraphicsCore->ctx, theVisualGraphicsCore->port);
     if (!ok) {
         return 3;
     }

     ok = aglSetCurrentContext(theVisualGraphicsCore->ctx);
     if (!ok) {
         return 4;
     }

 	ok = aglUpdateContext(theVisualGraphicsCore->ctx);
 	if (!ok) {
 		return 5;
 	}

 	GLint swapinterval = 1;
     ok = aglSetInteger(theVisualGraphicsCore->ctx, AGL_SWAP_INTERVAL, &swapinterval);
     if (!ok) {
         return 6;
     }

     aglDestroyPixelFormat(fmt);

     return 0;
 }


 void VisualGraphicsCore::cleanupAGL() {
     aglSetCurrentContext(NULL);
     if (theVisualGraphicsCore->ctx != NULL) {
 		aglSetDrawable(theVisualGraphicsCore->ctx, NULL);
 		aglDestroyContext(theVisualGraphicsCore->ctx);
     }
 }

 #endif


 uint16 VisualGraphicsCore::setCurrentContext() {
 #if TARGET_OS_MAC
 	GLboolean ok;
     ok = aglSetCurrentContext(theVisualGraphicsCore->ctx);
     if(!ok) {
         return 1;
     }
 #endif
 #if TARGET_OS_WIN
 	if (!wglMakeCurrent(theVisualGraphicsCore->windowDC, theVisualGraphicsCore->ctx)) {
 		writeLastErrorLog("setCurrentContext");
         return 1;
 	}
 #endif
 	return 0;
 }


 #if TARGET_OS_WIN

 uint8 VisualGraphicsCore::setupWGL() {

     PIXELFORMATDESCRIPTOR pfd;
     memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));

     pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
     pfd.nVersion = 1;
     pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
     pfd.iPixelType = PFD_TYPE_RGBA;
 	pfd.cColorBits = 24;
 	pfd.cRedBits = 8;
 	pfd.cGreenBits = 8;
 	pfd.cBlueBits = 8;
 	pfd.cAlphaBits = 8;
     pfd.cDepthBits = 24;

 	pfd.iLayerType = PFD_MAIN_PLANE;

 	int pixelFormat = ChoosePixelFormat(theVisualGraphicsCore->windowDC, &pfd);
     if (pixelFormat == 0) {
 		writeLastErrorLog("setupWGL1");
         return 1;
 	}

 	if (SetPixelFormat(theVisualGraphicsCore->windowDC, pixelFormat, &pfd) == 0) {
 		writeLastErrorLog("setupWGL2");
         return 2;
 	}

 	theVisualGraphicsCore->ctx = wglCreateContext(theVisualGraphicsCore->windowDC);
     if (theVisualGraphicsCore->ctx == NULL) {
 		writeLastErrorLog("setupWGL3");
         return 3;
 	}

 	if (!wglMakeCurrent(theVisualGraphicsCore->windowDC, theVisualGraphicsCore->ctx)) {
 		writeLastErrorLog("setupWGL4");
         return 4;
 	}

     // enable v-sync if WGL_EXT_swap_control is supported
 	/*
     PFNWGLSWAPINTERVALEXTPROC wglSwapIntervalEXT = NULL;
     wglSwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC)wglGetProcAddress("wglSwapIntervalEXT");
     if (wglSwapIntervalEXT != NULL)
         wglSwapIntervalEXT(1);
 	*/

 	return 0;
 }


 void VisualGraphicsCore::cleanUpWGL() {

     wglMakeCurrent(NULL, NULL);

     if (theVisualGraphicsCore->ctx != NULL) {
         wglDeleteContext(theVisualGraphicsCore->ctx);
         theVisualGraphicsCore->ctx = NULL;
     }

     if (theVisualGraphicsCore->windowDC) {
 		ReleaseDC(theVisualGraphicsCore->port, theVisualGraphicsCore->windowDC);
         theVisualGraphicsCore->windowDC = NULL;
     }
 }


 HDC VisualGraphicsCore::getWindowDC() {
 	if (theVisualGraphicsCore->windowDC) {
 		return theVisualGraphicsCore->windowDC;
 	} else {
 		// if the HDC has not been set yet for the visualizer, we return the HDC of the main screen
 		return GetDC(NULL);
 	}
 }

 #endif


 void VisualGraphicsCore::setGraphicsDevicePort(const GRAPHICS_DEVICE thePort) {
     theVisualGraphicsCore->port = thePort;
 #if TARGET_OS_WIN
 	theVisualGraphicsCore->windowDC = GetDC(thePort);
 #endif
 }


 GRAPHICS_DEVICE VisualGraphicsCore::getGraphicsDevicePort() {
     return theVisualGraphicsCore->port;
 }


 PixelRect VisualGraphicsCore::getScreenRect() {
 	PixelRect screenRect;
 	uint32 screenWidth;
 	uint32 screenHeight;
 #if TARGET_OS_WIN
 	screenWidth = GetSystemMetrics(SM_CXSCREEN);
 	screenHeight = GetSystemMetrics(SM_CYSCREEN);
 #endif
 #if TARGET_OS_MAC
 	screenWidth = (uint32)CGDisplayPixelsWide(theVisualGraphicsCore->directDisplayId);
 	screenHeight = (uint32)CGDisplayPixelsHigh(theVisualGraphicsCore->directDisplayId);
 #endif
 	screenRect.width = screenWidth;
 	screenRect.height = screenHeight;
 	return screenRect;
 }


 uint16 VisualGraphicsCore::getBitsPerPixelOfScreen() {
 	uint16 bitsPerPixel;
 #if TARGET_OS_WIN
 	bitsPerPixel = GetDeviceCaps(theVisualGraphicsCore->windowDC, BITSPIXEL);
 #endif
 #if TARGET_OS_MAC
 	bitsPerPixel = (uint16)CGDisplayBitsPerPixel(theVisualGraphicsCore->directDisplayId);
 #endif
 	return bitsPerPixel;
 }


 uint16 VisualGraphicsCore::getRefreshRateOfScreen() {
 	uint16 refreshRate = 0;
 #if TARGET_OS_MAC
 	long refreshRateLong;
 	CFDictionaryRef displayMode;
 	CFNumberRef number;
 	displayMode = CGDisplayCurrentMode(theVisualGraphicsCore->directDisplayId);
 	number = (CFNumberRef)CFDictionaryGetValue(displayMode, kCGDisplayRefreshRate);
 	CFNumberGetValue(number, kCFNumberLongType, &refreshRateLong);
 	refreshRate = (uint16)refreshRateLong;
 #endif
 #if TARGET_OS_WIN
 	refreshRate = GetDeviceCaps(theVisualGraphicsCore->windowDC, VREFRESH);
 #endif
 	return refreshRate;
 }


 void VisualGraphicsCore::finishGLDrawing() {
     //glFinish();
     //glFlush();
 #if TARGET_OS_MAC
 	aglSwapBuffers(theVisualGraphicsCore->ctx);
 #endif
 #if TARGET_OS_WIN
 	SwapBuffers(theVisualGraphicsCore->windowDC);
 #endif
 }


 PixelRect VisualGraphicsCore::getCanvasSurroundingRect() {
 	PixelRect pixelSize;
 #if TARGET_OS_MAC
 	::Rect aRect;
 	GetPortBounds(theVisualGraphicsCore->port, &aRect);
 	pixelSize.width = aRect.right - aRect.left;
 	pixelSize.height = aRect.bottom - aRect.top;
 #endif
 #if TARGET_OS_WIN
 	HWND windowHandle;
 	RECT windowRect;
 	POINT aPoint;
 	aPoint.x = 0;
 	aPoint.y = 0;

 	windowHandle = theVisualGraphicsCore->port;
 	ClientToScreen(windowHandle, &aPoint);
 	GetClientRect(windowHandle, &windowRect);

 	windowRect.bottom += aPoint.y;
 	windowRect.right += aPoint.x;
 	pixelSize.width = windowRect.right - aPoint.x;
 	pixelSize.height =  windowRect.bottom - aPoint.y;
 #endif
 	return pixelSize;
 }


 void VisualGraphicsCore::setViewport(const BottomLeftPositionedPixelRect& canvasRect, const bool isFullscreen) {

 	Pixel viewportBottomLeft;
 	viewportBottomLeft.x = 0;
 	viewportBottomLeft.y = 0;

 #if TARGET_OS_MAC
 	GLboolean ok;
 	GLint bufferRect[4];
 	bufferRect[0] = (GLint)canvasRect.bottomLeftPixel.x;
 	bufferRect[1] = (GLint)canvasRect.bottomLeftPixel.y;
 	bufferRect[2] = (GLint)canvasRect.pixelRect.width;
 	bufferRect[3] = (GLint)canvasRect.pixelRect.height;

 	ok = GL_FALSE;
 	ok = aglEnable(theVisualGraphicsCore->ctx, AGL_BUFFER_RECT);
 	if(!ok) {
 		writeLog("setViewport: unable to enable AGL_BUFFER_RECT");
 	}
 	// adjust drawing rectange
 	ok = aglSetInteger(theVisualGraphicsCore->ctx, AGL_BUFFER_RECT, bufferRect);
 	if(!ok) {
 		writeLog("setViewport: aglSetInteger AGL_BUFFER_RECT != ok");
 	}
 	ok = aglUpdateContext(theVisualGraphicsCore->ctx);
 	if(!ok) {
 		writeLog("setViewport: aglUpdateContext != ok");
 	}
 #endif

 #if TARGET_OS_WIN
 if (isFullscreen == true) {
 	glEnable(GL_SCISSOR_TEST);
 	glScissor(canvasRect.bottomLeftPixel.x, canvasRect.bottomLeftPixel.y, (GLsizei)canvasRect.pixelRect.width, (GLsizei)canvasRect.pixelRect.height);
 	viewportBottomLeft.x = canvasRect.bottomLeftPixel.x;
 	viewportBottomLeft.y = canvasRect.bottomLeftPixel.y;
 }
 #endif

 	glViewport((GLint)viewportBottomLeft.x, (GLint)viewportBottomLeft.y, (GLsizei)canvasRect.pixelRect.width, (GLsizei)canvasRect.pixelRect.height);

 }
	/*
	* Project: VizKit
	* Version: 2.3

	* Date: 20090823
	* File: VisualGraphicsCore.cpp
	*
	*/

	/***************************************************************************

	Copyright (c) 2004-2009 Heiko Wichmann (http://www.imagomat.de/vizkit)


	This software is provided 'as-is', without any expressed or implied warranty.
	In no event will the authors be held liable for any damages
	arising from the use of this software.

	Permission is granted to anyone to use this software for any purpose,
	including commercial applications, and to alter it and redistribute it
	freely, subject to the following restrictions:

	1. The origin of this software must not be misrepresented;
	you must not claim that you wrote the original software.
	If you use this software in a product, an acknowledgment
	in the product documentation would be appreciated
	but is not required.

	2. Altered source versions must be plainly marked as such,
	and must not be misrepresented as being the original software.

	3. This notice may not be removed or altered from any source distribution.

	***************************************************************************/

	#include "VisualGraphicsCore.h"
	#include "VisualErrorHandling.h"

	#if TARGET_OS_WIN
	#include <stdio.h> // sprintf
	#endif


	#if TARGET_OS_WIN
	#include <GL/gl.h>
	#include <GL/glu.h>
	#endif


	using namespace VizKit;


	VisualGraphicsCore* VisualGraphicsCore::theVisualGraphicsCore = NULL; // singleton


	VisualGraphicsCore::VisualGraphicsCore() {
	ctx = NULL;
	#if TARGET_OS_MAC
	directDisplayId = CGMainDisplayID();
	#endif
	#if TARGET_OS_WIN
	windowDC = NULL;
	#endif
	}


	VisualGraphicsCore::~VisualGraphicsCore() {
	// null
	}


	VisualGraphicsCore* VisualGraphicsCore::getInstance() {
	if (theVisualGraphicsCore == NULL) {
	theVisualGraphicsCore = new VisualGraphicsCore;
	}
	return theVisualGraphicsCore;
	}


	void VisualGraphicsCore::dispose() {
	if (theVisualGraphicsCore != NULL) {
	delete theVisualGraphicsCore;
	theVisualGraphicsCore = NULL;
	}
	}


	bool VisualGraphicsCore::setupContext() {

	bool success = true;
	uint8 errNum = 0;
	char errLog[256];

	#if TARGET_OS_MAC
	errNum = theVisualGraphicsCore->setupAGL();
	if (errNum != 0) {
	sprintf(errLog, "error %d on setupAGL in file: %s (line: %d) [%s])", errNum, __FILE__, __LINE__, __FUNCTION__);
	writeLog(errLog);
	success = false;
	}
	#endif

	#if TARGET_OS_WIN
	errNum = theVisualGraphicsCore->setupWGL();
	if (errNum != 0) {
	sprintf(errLog, "error %d on setupWGL in file: %s (line: %d) [%s])", errNum, __FILE__, __LINE__, __FUNCTION__);
	writeLog(errLog);
	success = false;
	}
	#endif

	return success;
	}


	#if TARGET_OS_MAC
	uint8 VisualGraphicsCore::setupAGL() {
	GLboolean ok;

	GLint attrib[] = {AGL_RGBA, AGL_RED_SIZE, 8, AGL_GREEN_SIZE, 8, AGL_BLUE_SIZE, 8, AGL_ALPHA_SIZE, 8, AGL_ACCELERATED, AGL_DOUBLEBUFFER, AGL_DEPTH_SIZE, 24, AGL_CLOSEST_POLICY, AGL_NONE};

	AGLPixelFormat fmt = aglChoosePixelFormat(NULL, 0, attrib);

	if (fmt == NULL) {
	return 1;
	}

	theVisualGraphicsCore->ctx = aglCreateContext(fmt, NULL);
	if (theVisualGraphicsCore->ctx == NULL) {
	return 2;
	}

	ok = aglSetDrawable(theVisualGraphicsCore->ctx, theVisualGraphicsCore->port);
	if (!ok) {
	return 3;
	}

	ok = aglSetCurrentContext(theVisualGraphicsCore->ctx);
	if (!ok) {
	return 4;
	}

	ok = aglUpdateContext(theVisualGraphicsCore->ctx);
	if (!ok) {
	return 5;
	}

	GLint swapinterval = 1;
	ok = aglSetInteger(theVisualGraphicsCore->ctx, AGL_SWAP_INTERVAL, &swapinterval);
	if (!ok) {
	return 6;
	}

	aglDestroyPixelFormat(fmt);

	return 0;
	}


	void VisualGraphicsCore::cleanupAGL() {
	aglSetCurrentContext(NULL);
	if (theVisualGraphicsCore->ctx != NULL) {
	aglSetDrawable(theVisualGraphicsCore->ctx, NULL);
	aglDestroyContext(theVisualGraphicsCore->ctx);
	}
	}

	#endif


	uint16 VisualGraphicsCore::setCurrentContext() {
	#if TARGET_OS_MAC
	GLboolean ok;
	ok = aglSetCurrentContext(theVisualGraphicsCore->ctx);
	if(!ok) {
	return 1;
	}
	#endif
	#if TARGET_OS_WIN
	if (!wglMakeCurrent(theVisualGraphicsCore->windowDC, theVisualGraphicsCore->ctx)) {
	writeLastErrorLog("setCurrentContext");
	return 1;
	}
	#endif
	return 0;
	}


	#if TARGET_OS_WIN

	uint8 VisualGraphicsCore::setupWGL() {

	PIXELFORMATDESCRIPTOR pfd;
	memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));

	pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
	pfd.nVersion = 1;
	pfd.dwFlags = PFD_DRAW_TO_WINDOW \| PFD_SUPPORT_OPENGL \| PFD_DOUBLEBUFFER;
	pfd.iPixelType = PFD_TYPE_RGBA;
	pfd.cColorBits = 24;
	pfd.cRedBits = 8;
	pfd.cGreenBits = 8;
	pfd.cBlueBits = 8;
	pfd.cAlphaBits = 8;
	pfd.cDepthBits = 24;

	pfd.iLayerType = PFD_MAIN_PLANE;

	int pixelFormat = ChoosePixelFormat(theVisualGraphicsCore->windowDC, &pfd);
	if (pixelFormat == 0) {
	writeLastErrorLog("setupWGL1");
	return 1;
	}

	if (SetPixelFormat(theVisualGraphicsCore->windowDC, pixelFormat, &pfd) == 0) {
	writeLastErrorLog("setupWGL2");
	return 2;
	}

	theVisualGraphicsCore->ctx = wglCreateContext(theVisualGraphicsCore->windowDC);
	if (theVisualGraphicsCore->ctx == NULL) {
	writeLastErrorLog("setupWGL3");
	return 3;
	}

	if (!wglMakeCurrent(theVisualGraphicsCore->windowDC, theVisualGraphicsCore->ctx)) {
	writeLastErrorLog("setupWGL4");
	return 4;
	}

	// enable v-sync if WGL_EXT_swap_control is supported
	/*
	PFNWGLSWAPINTERVALEXTPROC wglSwapIntervalEXT = NULL;
	wglSwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC)wglGetProcAddress("wglSwapIntervalEXT");
	if (wglSwapIntervalEXT != NULL)
	wglSwapIntervalEXT(1);
	*/

	return 0;
	}


	void VisualGraphicsCore::cleanUpWGL() {

	wglMakeCurrent(NULL, NULL);

	if (theVisualGraphicsCore->ctx != NULL) {
	wglDeleteContext(theVisualGraphicsCore->ctx);
	theVisualGraphicsCore->ctx = NULL;
	}

	if (theVisualGraphicsCore->windowDC) {
	ReleaseDC(theVisualGraphicsCore->port, theVisualGraphicsCore->windowDC);
	theVisualGraphicsCore->windowDC = NULL;
	}
	}


	HDC VisualGraphicsCore::getWindowDC() {
	if (theVisualGraphicsCore->windowDC) {
	return theVisualGraphicsCore->windowDC;
	} else {
	// if the HDC has not been set yet for the visualizer, we return the HDC of the main screen
	return GetDC(NULL);
	}
	}

	#endif


	void VisualGraphicsCore::setGraphicsDevicePort(const GRAPHICS_DEVICE thePort) {
	theVisualGraphicsCore->port = thePort;
	#if TARGET_OS_WIN
	theVisualGraphicsCore->windowDC = GetDC(thePort);
	#endif
	}


	GRAPHICS_DEVICE VisualGraphicsCore::getGraphicsDevicePort() {
	return theVisualGraphicsCore->port;
	}


	PixelRect VisualGraphicsCore::getScreenRect() {
	PixelRect screenRect;
	uint32 screenWidth;
	uint32 screenHeight;
	#if TARGET_OS_WIN
	screenWidth = GetSystemMetrics(SM_CXSCREEN);
	screenHeight = GetSystemMetrics(SM_CYSCREEN);
	#endif
	#if TARGET_OS_MAC
	screenWidth = (uint32)CGDisplayPixelsWide(theVisualGraphicsCore->directDisplayId);
	screenHeight = (uint32)CGDisplayPixelsHigh(theVisualGraphicsCore->directDisplayId);
	#endif
	screenRect.width = screenWidth;
	screenRect.height = screenHeight;
	return screenRect;
	}


	uint16 VisualGraphicsCore::getBitsPerPixelOfScreen() {
	uint16 bitsPerPixel;
	#if TARGET_OS_WIN
	bitsPerPixel = GetDeviceCaps(theVisualGraphicsCore->windowDC, BITSPIXEL);
	#endif
	#if TARGET_OS_MAC
	bitsPerPixel = (uint16)CGDisplayBitsPerPixel(theVisualGraphicsCore->directDisplayId);
	#endif
	return bitsPerPixel;
	}


	uint16 VisualGraphicsCore::getRefreshRateOfScreen() {
	uint16 refreshRate = 0;
	#if TARGET_OS_MAC
	long refreshRateLong;
	CFDictionaryRef displayMode;
	CFNumberRef number;
	displayMode = CGDisplayCurrentMode(theVisualGraphicsCore->directDisplayId);
	number = (CFNumberRef)CFDictionaryGetValue(displayMode, kCGDisplayRefreshRate);
	CFNumberGetValue(number, kCFNumberLongType, &refreshRateLong);
	refreshRate = (uint16)refreshRateLong;
	#endif
	#if TARGET_OS_WIN
	refreshRate = GetDeviceCaps(theVisualGraphicsCore->windowDC, VREFRESH);
	#endif
	return refreshRate;
	}


	void VisualGraphicsCore::finishGLDrawing() {
	//glFinish();
	//glFlush();
	#if TARGET_OS_MAC
	aglSwapBuffers(theVisualGraphicsCore->ctx);
	#endif
	#if TARGET_OS_WIN
	SwapBuffers(theVisualGraphicsCore->windowDC);
	#endif
	}


	PixelRect VisualGraphicsCore::getCanvasSurroundingRect() {
	PixelRect pixelSize;
	#if TARGET_OS_MAC
	::Rect aRect;
	GetPortBounds(theVisualGraphicsCore->port, &aRect);
	pixelSize.width = aRect.right - aRect.left;
	pixelSize.height = aRect.bottom - aRect.top;
	#endif
	#if TARGET_OS_WIN
	HWND windowHandle;
	RECT windowRect;
	POINT aPoint;
	aPoint.x = 0;
	aPoint.y = 0;

	windowHandle = theVisualGraphicsCore->port;
	ClientToScreen(windowHandle, &aPoint);
	GetClientRect(windowHandle, &windowRect);

	windowRect.bottom += aPoint.y;
	windowRect.right += aPoint.x;
	pixelSize.width = windowRect.right - aPoint.x;
	pixelSize.height = windowRect.bottom - aPoint.y;
	#endif
	return pixelSize;
	}


	void VisualGraphicsCore::setViewport(const BottomLeftPositionedPixelRect& canvasRect, const bool isFullscreen) {

	Pixel viewportBottomLeft;
	viewportBottomLeft.x = 0;
	viewportBottomLeft.y = 0;

	#if TARGET_OS_MAC
	GLboolean ok;
	GLint bufferRect[4];
	bufferRect[0] = (GLint)canvasRect.bottomLeftPixel.x;
	bufferRect[1] = (GLint)canvasRect.bottomLeftPixel.y;
	bufferRect[2] = (GLint)canvasRect.pixelRect.width;
	bufferRect[3] = (GLint)canvasRect.pixelRect.height;

	ok = GL_FALSE;
	ok = aglEnable(theVisualGraphicsCore->ctx, AGL_BUFFER_RECT);
	if(!ok) {
	writeLog("setViewport: unable to enable AGL_BUFFER_RECT");
	}
	// adjust drawing rectange
	ok = aglSetInteger(theVisualGraphicsCore->ctx, AGL_BUFFER_RECT, bufferRect);
	if(!ok) {
	writeLog("setViewport: aglSetInteger AGL_BUFFER_RECT != ok");
	}
	ok = aglUpdateContext(theVisualGraphicsCore->ctx);
	if(!ok) {
	writeLog("setViewport: aglUpdateContext != ok");
	}
	#endif

	#if TARGET_OS_WIN
	if (isFullscreen == true) {
	glEnable(GL_SCISSOR_TEST);
	glScissor(canvasRect.bottomLeftPixel.x, canvasRect.bottomLeftPixel.y, (GLsizei)canvasRect.pixelRect.width, (GLsizei)canvasRect.pixelRect.height);
	viewportBottomLeft.x = canvasRect.bottomLeftPixel.x;
	viewportBottomLeft.y = canvasRect.bottomLeftPixel.y;
	}
	#endif

	glViewport((GLint)viewportBottomLeft.x, (GLint)viewportBottomLeft.y, (GLsizei)canvasRect.pixelRect.width, (GLsizei)canvasRect.pixelRect.height);

	}