lesson25.cpp

关于OpenGL的实例教程源代码

			}
		}
	}

	if (fullscreen)												// Are We Still In Fullscreen Mode?
	{
		dwExStyle=WS_EX_APPWINDOW;								// Window Extended Style
		dwStyle=WS_POPUP;										// Windows Style
		ShowCursor(FALSE);										// Hide Mouse Pointer
	}
	else
	{
		dwExStyle=WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;			// Window Extended Style
		dwStyle=WS_OVERLAPPEDWINDOW;							// Windows Style
	}

	AdjustWindowRectEx(&WindowRect, dwStyle, FALSE, dwExStyle);	// Adjust Window To True Requested Size

	// Create The Window
	if (!(hWnd=CreateWindowEx(	dwExStyle,						// Extended Style For The Window
								"OpenGL",						// Class Name
								title,							// Window Title
								dwStyle |						// Defined Window Style
								WS_CLIPSIBLINGS |				// Required Window Style
								WS_CLIPCHILDREN,				// Required Window Style
								0, 0,							// Window Position
								WindowRect.right-WindowRect.left,	// Calculate Window Width
								WindowRect.bottom-WindowRect.top,	// Calculate Window Height
								NULL,							// No Parent Window
								NULL,							// No Menu
								hInstance,						// Instance
								NULL)))							// Dont Pass Anything To WM_CREATE
	{
		KillGLWindow();											// Reset The Display
		MessageBox(NULL,"Window Creation Error.","ERROR",MB_OK|MB_ICONEXCLAMATION);
		return FALSE;											// Return FALSE
	}

	static	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
		bits,													// 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
	};

	if (!(hDC=GetDC(hWnd)))										// Did We Get A Device Context?
	{
		KillGLWindow();											// Reset The Display
		MessageBox(NULL,"Can't Create A GL Device Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
		return FALSE;											// Return FALSE
	}

	if (!(PixelFormat=ChoosePixelFormat(hDC,&pfd)))				// Did Windows Find A Matching Pixel Format?
	{
		KillGLWindow();											// Reset The Display
		MessageBox(NULL,"Can't Find A Suitable PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION);
		return FALSE;											// Return FALSE
	}

	if(!SetPixelFormat(hDC,PixelFormat,&pfd))					// Are We Able To Set The Pixel Format?
	{
		KillGLWindow();											// Reset The Display
		MessageBox(NULL,"Can't Set The PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION);
		return FALSE;											// Return FALSE
	}

	if (!(hRC=wglCreateContext(hDC)))							// Are We Able To Get A Rendering Context?
	{
		KillGLWindow();											// Reset The Display
		MessageBox(NULL,"Can't Create A GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
		return FALSE;											// Return FALSE
	}

	if(!wglMakeCurrent(hDC,hRC))								// Try To Activate The Rendering Context
	{
		KillGLWindow();											// Reset The Display
		MessageBox(NULL,"Can't Activate The GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
		return FALSE;											// Return FALSE
	}

	ShowWindow(hWnd,SW_SHOW);									// Show The Window
	SetForegroundWindow(hWnd);									// Slightly Higher Priority
	SetFocus(hWnd);												// Sets Keyboard Focus To The Window
	ReSizeGLScene(width, height);								// Set Up Our Perspective GL Screen

	if (!InitGL())												// Initialize Our Newly Created GL Window
	{
		KillGLWindow();											// Reset The Display
		MessageBox(NULL,"Initialization Failed.","ERROR",MB_OK|MB_ICONEXCLAMATION);
		return FALSE;											// Return FALSE
	}

	return TRUE;												// Success
}

LRESULT CALLBACK WndProc(	HWND	hWnd,						// Handle For This Window
							UINT	uMsg,						// Message For This Window
							WPARAM	wParam,						// Additional Message Information
							LPARAM	lParam)						// Additional Message Information
{
	switch (uMsg)												// Check For Windows Messages
	{
		case WM_ACTIVATE:										// Watch For Window Activate Message
		{
			if (!HIWORD(wParam))								// Check Minimization State
			{
				active=TRUE;									// Program Is Active
			}
			else												// Otherwise
			{
				active=FALSE;									// Program Is No Longer Active
			}

			return 0;											// Return To The Message Loop
		}

		case WM_SYSCOMMAND:										// Intercept System Commands
		{
			switch (wParam)										// Check System Calls
			{
				case SC_SCREENSAVE:								// Screensaver Trying To Start?
				case SC_MONITORPOWER:							// Monitor Trying To Enter Powersave?
				return 0;										// Prevent From Happening
			}
			break;												// Exit
		}

		case WM_CLOSE:											// Did We Receive A Close Message?
		{
			PostQuitMessage(0);									// Send A Quit Message
			return 0;											// Jump Back
		}

		case WM_KEYDOWN:										// Is A Key Being Held Down?
		{
			keys[wParam] = TRUE;								// If So, Mark It As TRUE
			return 0;											// Jump Back
		}

		case WM_KEYUP:											// Has A Key Been Released?
		{
			keys[wParam] = FALSE;								// If So, Mark It As FALSE
			return 0;											// Jump Back
		}

		case WM_SIZE:											// Resize The OpenGL Window
		{
			ReSizeGLScene(LOWORD(lParam),HIWORD(lParam));		// LoWord=Width, HiWord=Height
			return 0;											// Jump Back
		}
	}

	// Pass All Unhandled Messages To DefWindowProc
	return DefWindowProc(hWnd,uMsg,wParam,lParam);
}

int WINAPI WinMain(	HINSTANCE	hInstance,						// Instance
					HINSTANCE	hPrevInstance,					// Previous Instance
					LPSTR		lpCmdLine,						// Command Line Parameters
					int			nCmdShow)						// Window Show State
{
	MSG		msg;												// Windows Message Structure
	BOOL	done=FALSE;											// Bool Variable To Exit Loop

	// Ask The User Which Screen Mode They Prefer
	if (MessageBox(NULL,"Would You Like To Run In Fullscreen Mode?", "Start FullScreen?",MB_YESNO|MB_ICONQUESTION)==IDNO)
	{
		fullscreen=FALSE;										// Windowed Mode
	}

	// Create Our OpenGL Window
	if (!CreateGLWindow("Piotr Cieslak & NeHe's Morphing Points Tutorial",640,480,16,fullscreen))
	{
		return 0;												// Quit If Window Was Not Created
	}

	while(!done)												// Loop That Runs While done=FALSE
	{
		if (PeekMessage(&msg,NULL,0,0,PM_REMOVE))				// Is There A Message Waiting?
		{
			if (msg.message==WM_QUIT)							// Have We Received A Quit Message?
			{
				done=TRUE;										// If So done=TRUE
			}
			else												// If Not, Deal With Window Messages
			{
				TranslateMessage(&msg);							// Translate The Message
				DispatchMessage(&msg);							// Dispatch The Message
			}
		}
		else													// If There Are No Messages
		{
			// Draw The Scene.  Watch For ESC Key And Quit Messages From DrawGLScene()
			if (active && keys[VK_ESCAPE])						// Active?  Was There A Quit Received?
			{
				done=TRUE;										// ESC or DrawGLScene Signalled A Quit
			}
			else												// Not Time To Quit, Update Screen
			{
				DrawGLScene();									// Draw The Scene (Don't Draw When Inactive 1% CPU Use)
				SwapBuffers(hDC);								// Swap Buffers (Double Buffering)

				if(keys[VK_PRIOR])								// Is Page Up Being Pressed?
					zspeed+=0.01f;								// Increase zspeed

				if(keys[VK_NEXT])								// Is Page Down Being Pressed?
					zspeed-=0.01f;								// Decrease zspeed

				if(keys[VK_DOWN])								// Is Down Arrow Being Pressed?
					xspeed+=0.01f;								// Increase xspeed

				if(keys[VK_UP])									// Is Up Arrow Being Pressed?
					xspeed-=0.01f;								// Decrease xspeed

				if(keys[VK_RIGHT])								// Is Right Arrow Being Pressed?
					yspeed+=0.01f;								// Increase yspeed

				if(keys[VK_LEFT])								// Is Left Arrow Being Pressed?
					yspeed-=0.01f;								// Decrease yspeed

				if (keys['Q'])									// Is Q Key Being Pressed?
				 cz-=0.01f;										// Move Object Away From Viewer

				if (keys['Z'])									// Is Z Key Being Pressed?
				 cz+=0.01f;										// Move Object Towards Viewer

				if (keys['W'])									// Is W Key Being Pressed?
				 cy+=0.01f;										// Move Object Up

				if (keys['S'])									// Is S Key Being Pressed?
				 cy-=0.01f;										// Move Object Down

				if (keys['D'])									// Is D Key Being Pressed?
				 cx+=0.01f;										// Move Object Right

				if (keys['A'])									// Is A Key Being Pressed?
				 cx-=0.01f;										// Move Object Left

				if (keys['1'] && (key!=1) && !morph)			// Is 1 Pressed, key Not Equal To 1 And Morph False?
				{
					key=1;										// Sets key To 1 (To Prevent Pressing 1 2x In A Row)
					morph=TRUE;									// Set morph To True (Starts Morphing Process)
					dest=&morph1;								// Destination Object To Morph To Becomes morph1
				}
				if (keys['2'] && (key!=2) && !morph)			// Is 2 Pressed, key Not Equal To 2 And Morph False?
				{
					key=2;										// Sets key To 2 (To Prevent Pressing 2 2x In A Row)
					morph=TRUE;									// Set morph To True (Starts Morphing Process)
					dest=&morph2;								// Destination Object To Morph To Becomes morph2
				}
				if (keys['3'] && (key!=3) && !morph)			// Is 3 Pressed, key Not Equal To 3 And Morph False?
				{
					key=3;										// Sets key To 3 (To Prevent Pressing 3 2x In A Row)
					morph=TRUE;									// Set morph To True (Starts Morphing Process)
					dest=&morph3;								// Destination Object To Morph To Becomes morph3
				}
				if (keys['4'] && (key!=4) && !morph)			// Is 4 Pressed, key Not Equal To 4 And Morph False?
				{
					key=4;										// Sets key To 4 (To Prevent Pressing 4 2x In A Row)
					morph=TRUE;									// Set morph To True (Starts Morphing Process)
					dest=&morph4;								// Destination Object To Morph To Becomes morph4
				}

				if (keys[VK_F1])								// Is F1 Being Pressed?
				{
					keys[VK_F1]=FALSE;							// If So Make Key FALSE
					KillGLWindow();								// Kill Our Current Window
					fullscreen=!fullscreen;						// Toggle Fullscreen / Windowed Mode
					// Recreate Our OpenGL Window
					if (!CreateGLWindow("Piotr Cieslak & NeHe's Morphing Points Tutorial",640,480,16,fullscreen))
					{
						return 0;								// Quit If Window Was Not Created
					}
				}
			}
		}
	}

	// Shutdown
	KillGLWindow();												// Kill The Window
	return (msg.wParam);										// Exit The Program
}