自学教程：C++ ChoosePixelFormat函数代码示例

void CreateWindowGL (gl_window_t *win)									// This Code Creates Our OpenGL Window{	__int64	timer;														// Holds High Resolution Timer Information	DWORD windowStyle = WS_OVERLAPPEDWINDOW;							// Define Our Window Style	DWORD windowExtendedStyle = WS_EX_APPWINDOW;						// Define The Window's Extended Style	PIXELFORMATDESCRIPTOR pfd =											// pfd Tells Windows How We Want Things To Be	{		sizeof (PIXELFORMATDESCRIPTOR),									// Size Of This Pixel Format Descriptor		1,																// Version Number		PFD_DRAW_TO_WINDOW |											// Format Must Support Window		PFD_SUPPORT_OPENGL |											// Format Must Support OpenGL		PFD_DOUBLEBUFFER,												// Must Support Double Buffering		PFD_TYPE_RGBA,													// Request An RGBA Format		win->init.bitsPerPixel,										// Select Our Color Depth		0, 0, 0, 0, 0, 0,												// Color Bits Ignored		0,																// No Alpha Buffer		0,																// Shift Bit Ignored		0,																// No Accumulation Buffer		0, 0, 0, 0,														// Accumulation Bits Ignored		16,																// 16Bit Z-Buffer (Depth Buffer)  		0,																// No Stencil Buffer		0,																// No Auxiliary Buffer		PFD_MAIN_PLANE,													// Main Drawing Layer		0,																// Reserved		0, 0, 0															// Layer Masks Ignored	};	RECT windowRect = {0, 0, win->init.width, win->init.height};	// Define Our Window Coordinates	GLuint PixelFormat;													// Will Hold The Selected Pixel Format	if (win->init.isFullScreen == TRUE)								// Fullscreen Requested, Try Changing Video Modes	{		if (ChangeScreenResolution (win->init.width, win->init.height, win->init.bitsPerPixel) == FALSE)		{			// Fullscreen Mode Failed.  Run In Windowed Mode Instead			MessageBox (HWND_DESKTOP, "Mode Switch Failed./nRunning In Windowed Mode.", "Error", MB_OK | MB_ICONEXCLAMATION);			win->init.isFullScreen = FALSE;							// Set isFullscreen To False (Windowed Mode)		}		else															// Otherwise (If Fullscreen Mode Was Successful)		{			ShowCursor (FALSE);											// Turn Off The Cursor			windowStyle = WS_POPUP;										// Set The WindowStyle To WS_POPUP (Popup Window)			windowExtendedStyle |= WS_EX_TOPMOST;						// Set The Extended Window Style To WS_EX_TOPMOST		}																// (Top Window Covering Everything Else)	}	else																// If Fullscreen Was Not Selected	{		// Adjust Window, Account For Window Borders		AdjustWindowRectEx (&windowRect, windowStyle, 0, windowExtendedStyle);	}	// Create The OpenGL Window	win->hWnd = CreateWindowExA (windowExtendedStyle,					// Extended Style								   win->init.application->className,	// Class Name								   win->init.title,					// Window Title								   windowStyle,							// Window Style								   win->init.left, win->init.top,								// Window X,Y Position								   windowRect.right - windowRect.left,	// Window Width								   windowRect.bottom - windowRect.top,	// Window Height								   HWND_DESKTOP,						// Desktop Is Window's Parent								   0,									// No Menu								   win->init.application->hInstance, // Pass The Window Instance								   win);	if (win->hWnd == 0)												// Was Window Creation A Success?	{		win->isCreated = FALSE;		return;	}	win->hDC = GetDC (win->hWnd);									// Grab A Device Context For This Window	if (win->hDC == 0)												// Did We Get A Device Context?	{		// Failed		DestroyWindow (win->hWnd);									// Destroy The Window		win->hWnd = 0;												// Zero The Window Handle		win->isCreated = FALSE;		return;													// Return False	}	PixelFormat = ChoosePixelFormat (win->hDC, &pfd);				// Find A Compatible Pixel Format	if (PixelFormat == 0)												// Did We Find A Compatible Format?	{		// Failed		ReleaseDC (win->hWnd, win->hDC);							// Release Our Device Context		win->hDC = 0;												// Zero The Device Context		DestroyWindow (win->hWnd);									// Destroy The Window		win->hWnd = 0;												// Zero The Window Handle		win->isCreated = FALSE;		return;													// Return False	}	if (SetPixelFormat (win->hDC, PixelFormat, &pfd) == FALSE)		// Try To Set The Pixel Format	{		// Failed		ReleaseDC (win->hWnd, win->hDC);							// Release Our Device Context		win->hDC = 0;												// Zero The Device Context		DestroyWindow (win->hWnd);									// Destroy The Window//.........这里部分代码省略.........

//.........这里部分代码省略.........            tmp += "rgba";        DJV_LOG(context->debugLog(), "djvWglContext",                QString("Pixel format %1: %2 %3/%4/%5/%6/%7").                arg(i).                arg(tmp.join(" ")).                arg(pixelFormatInfo.cColorBits).                arg(pixelFormatInfo.cRedBits).                arg(pixelFormatInfo.cGreenBits).                arg(pixelFormatInfo.cBlueBits).                arg(pixelFormatInfo.cAlphaBits));    }    PIXELFORMATDESCRIPTOR pixelFormat =    {        sizeof(PIXELFORMATDESCRIPTOR),        1,        PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL,        PFD_TYPE_RGBA,        32,        0, 0, 0, 0, 0, 0,        0,        0,        0,        0, 0, 0, 0,        0,        0,        0,        PFD_MAIN_PLANE,        0,        0, 0, 0    };    int pixelFormatId = ChoosePixelFormat(_p->device, &pixelFormat);    //DJV_DEBUG_PRINT("pixel format = " << pixelFormatId);    DJV_LOG(context->debugLog(), "djvWglContext",            QString("Chosen pixel format: %1").arg(pixelFormatId));    if (! pixelFormatId)    {        throw djvError(            "djvWglContext",            errorLabels()[ERROR_GET_PIXEL_FORMAT].arg(int(GetLastError())));    }    if (! SetPixelFormat(_p->device, pixelFormatId, &pixelFormat))    {        throw djvError(            "djvWglContext",            errorLabels()[ERROR_SET_PIXEL_FORMAT].arg(int(GetLastError())));    }    // Create OpengGL context.    DJV_LOG(context->debugLog(), "djvWglContext", "Creating OpenGL context...");    _p->context = wglCreateContext(_p->device);    if (! _p->context)    {        throw djvError(            "djvWglContext",            errorLabels()[ERROR_CREATE_CONTEXT].arg(int(GetLastError())));    }

//.........这里部分代码省略.........	}	if ( this->gl_config.stereo ) {		*iAttr++ = WGL_STEREO_ARB;		*iAttr++ = GL_TRUE;	}	if ( this->gl_config.multisamplebuffers ) {		*iAttr++ = WGL_SAMPLE_BUFFERS_ARB;		*iAttr++ = this->gl_config.multisamplebuffers;	}	if ( this->gl_config.multisamplesamples ) {		*iAttr++ = WGL_SAMPLES_ARB;		*iAttr++ = this->gl_config.multisamplesamples;	}	if ( this->gl_config.accelerated >= 0 ) {		*iAttr++ = WGL_ACCELERATION_ARB;		*iAttr++ = (this->gl_config.accelerated ? WGL_GENERIC_ACCELERATION_ARB : WGL_NO_ACCELERATION_ARB);	}	*iAttr = 0;	for ( i=0; ; ++i ) {		/* Get the window device context for our OpenGL drawing */		GL_hdc = GetDC(SDL_Window);		if ( GL_hdc == NULL ) {			SDL_SetError("Unable to get DC for SDL_Window");			return(-1);		}		/* Choose and set the closest available pixel format */		pixel_format = ChoosePixelFormatARB(this, iAttribs, fAttribs);		if ( !pixel_format ) {			pixel_format = ChoosePixelFormat(GL_hdc, &GL_pfd);		}		if ( !pixel_format ) {			SDL_SetError("No matching GL pixel format available");			return(-1);		}		if ( !SetPixelFormat(GL_hdc, pixel_format, &GL_pfd) ) {			if ( i == 0 ) {				/* First time through, try resetting the window */				if ( WIN_GL_ResetWindow(this) < 0 ) {					return(-1);				}				continue;			}			SDL_SetError("Unable to set HDC pixel format");			return(-1);		}		/* We either succeeded or failed by this point */		break;	}	DescribePixelFormat(GL_hdc, pixel_format, sizeof(GL_pfd), &GL_pfd);	GL_hrc = this->gl_data->wglCreateContext(GL_hdc);	if ( GL_hrc == NULL ) {		SDL_SetError("Unable to create GL context");		return(-1);	}	if ( WIN_GL_MakeCurrent(this) < 0 ) {		return(-1);	}	gl_active = 1;

int CGraphics::InitAll() {	GLuint PixelFormat; //Contiene el formato de pixel	static PIXELFORMATDESCRIPTOR pfd= //Contiene la informacion del formato del pixel	{		sizeof(PIXELFORMATDESCRIPTOR), //Tama
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