Text3D.c
上传用户:cz2828
上传日期:2007-01-14
资源大小:25k
文件大小:11k
- // GLPalette.c
- // OpenGL SuperBible, Chapter 17
- // Program by Richard S. Wright Jr.
- // This program demonstrates creation and use of a 332 palette for OpenGL
- #include <windows.h>
- #include <glgl.h>
- #include <glglu.h>
- // Palette Handle
- HPALETTE hPalette = NULL;
- static LPCTSTR lpszAppName = "Text3D";
- GLint nFontList;
- // Light values and coordinates
- GLfloat whiteLight[] = { 0.4f, 0.4f, 0.4f, 1.0f };
- GLfloat diffuseLight[] = { 0.8f, 0.8f, 0.8f, 1.0f };
- GLfloat specular[] = { 0.9f, 0.9f, 0.9f, 1.0f};
- GLfloat lightPos[] = { -100.0f, 200.0f, 50.0f, 1.0f };
- // Declaration for Window procedure
- LRESULT CALLBACK WndProc( HWND hWnd,
- UINT message,
- WPARAM wParam,
- LPARAM lParam);
- // Set Pixel Format function - forward declaration
- void SetDCPixelFormat(HDC hDC);
- void ChangeSize(GLsizei w, GLsizei h)
- {
- GLfloat nRange = 100.0f;
- GLfloat fAspect;
- // Prevent a divide by zero
- if(h == 0)
- h = 1;
- fAspect = (GLfloat)w/(GLfloat)h;
- // Set Viewport to window dimensions
- glViewport(0, 0, w, h);
- glMatrixMode(GL_PROJECTION);
- // Reset coordinate system
- glLoadIdentity();
- // Setup perspective for viewing
- gluPerspective(17.5f,fAspect,1,300);
- // Viewing transformation
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- glTranslatef(-1.8f, 0.0f, -15.0f);
- glRotatef(-20.0f, 0.0f, 1.0f,0.0f);
- glLightfv(GL_LIGHT0,GL_POSITION,lightPos);
- }
- void RenderScene(void)
- {
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- // Blue 3D Text
- glColor3ub(0, 0, 255);
- glPushMatrix();
- glListBase(nFontList);
- glCallLists (6, GL_UNSIGNED_BYTE, "OpenGL");
- glPopMatrix();
- }
- void SetupRC(HDC hDC)
- {
- // Setup the Font characteristics
- HFONT hFont;
- GLYPHMETRICSFLOAT agmf[128]; // Throw away
- LOGFONT logfont;
- logfont.lfHeight = -10;
- logfont.lfWidth = 0;
- logfont.lfEscapement = 0;
- logfont.lfOrientation = 0;
- logfont.lfWeight = FW_BOLD;
- logfont.lfItalic = FALSE;
- logfont.lfUnderline = FALSE;
- logfont.lfStrikeOut = FALSE;
- logfont.lfCharSet = ANSI_CHARSET;
- logfont.lfOutPrecision = OUT_DEFAULT_PRECIS;
- logfont.lfClipPrecision = CLIP_DEFAULT_PRECIS;
- logfont.lfQuality = DEFAULT_QUALITY;
- logfont.lfPitchAndFamily = DEFAULT_PITCH;
- strcpy(logfont.lfFaceName,"Arial");
- // Create the font and display list
- hFont = CreateFontIndirect(&logfont);
- SelectObject (hDC, hFont);
-
- //create display lists for glyphs 0 through 128 with 0.1 extrusion
- // and default deviation. The display list numbering starts at 1000
- // (it could be any number).
- nFontList = glGenLists(128);
- wglUseFontOutlines(hDC, 0, 128, nFontList, 0.0f, 0.5f,
- WGL_FONT_POLYGONS, agmf);
- DeleteObject(hFont);
- glEnable(GL_DEPTH_TEST); // Hidden surface removal
- glEnable(GL_COLOR_MATERIAL);
- glClearColor(0.0f, 0.0f, 0.0f, 1.0f );
- glEnable(GL_LIGHTING);
- glLightfv(GL_LIGHT0,GL_AMBIENT,whiteLight);
- glLightfv(GL_LIGHT0,GL_DIFFUSE,diffuseLight);
- glLightfv(GL_LIGHT0,GL_SPECULAR,specular);
- glLightfv(GL_LIGHT0,GL_POSITION,lightPos);
- glEnable(GL_LIGHT0);
- glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
- glMaterialfv(GL_FRONT, GL_SPECULAR,specular);
- glMateriali(GL_FRONT,GL_SHININESS,128);
- }
- // If necessary, creates a 3-3-2 palette for the device context listed.
- HPALETTE GetOpenGLPalette(HDC hDC)
- {
- HPALETTE hRetPal = NULL; // Handle to palette to be created
- PIXELFORMATDESCRIPTOR pfd; // Pixel Format Descriptor
- LOGPALETTE *pPal; // Pointer to memory for logical palette
- int nPixelFormat; // Pixel format index
- int nColors; // Number of entries in palette
- int i; // Counting variable
- BYTE RedRange,GreenRange,BlueRange;
- // Range for each color entry (7,7,and 3)
- // Get the pixel format index and retrieve the pixel format description
- nPixelFormat = GetPixelFormat(hDC);
- DescribePixelFormat(hDC, nPixelFormat, sizeof(PIXELFORMATDESCRIPTOR), &pfd);
- // Does this pixel format require a palette? If not, do not create a
- // palette and just return NULL
- if(!(pfd.dwFlags & PFD_NEED_PALETTE))
- return NULL;
- // Number of entries in palette. 8 bits yeilds 256 entries
- nColors = 1 << pfd.cColorBits;
- // Allocate space for a logical palette structure plus all the palette entries
- pPal = (LOGPALETTE*)malloc(sizeof(LOGPALETTE) +nColors*sizeof(PALETTEENTRY));
- // Fill in palette header
- pPal->palVersion = 0x300; // Windows 3.0
- pPal->palNumEntries = nColors; // table size
- // Build mask of all 1's. This creates a number represented by having
- // the low order x bits set, where x = pfd.cRedBits, pfd.cGreenBits, and
- // pfd.cBlueBits.
- RedRange = (1 << pfd.cRedBits) -1;
- GreenRange = (1 << pfd.cGreenBits) - 1;
- BlueRange = (1 << pfd.cBlueBits) -1;
- // Loop through all the palette entries
- for(i = 0; i < nColors; i++)
- {
- // Fill in the 8-bit equivalents for each component
- pPal->palPalEntry[i].peRed = (i >> pfd.cRedShift) & RedRange;
- pPal->palPalEntry[i].peRed = (unsigned char)(
- (double) pPal->palPalEntry[i].peRed * 255.0 / RedRange);
- pPal->palPalEntry[i].peGreen = (i >> pfd.cGreenShift) & GreenRange;
- pPal->palPalEntry[i].peGreen = (unsigned char)(
- (double)pPal->palPalEntry[i].peGreen * 255.0 / GreenRange);
- pPal->palPalEntry[i].peBlue = (i >> pfd.cBlueShift) & BlueRange;
- pPal->palPalEntry[i].peBlue = (unsigned char)(
- (double)pPal->palPalEntry[i].peBlue * 255.0 / BlueRange);
- pPal->palPalEntry[i].peFlags = (unsigned char) NULL;
- }
-
- // Create the palette
- hRetPal = CreatePalette(pPal);
- // Go ahead and select and realize the palette for this device context
- SelectPalette(hDC,hRetPal,FALSE);
- RealizePalette(hDC);
- // Free the memory used for the logical palette structure
- free(pPal);
- // Return the handle to the new palette
- return hRetPal;
- }
- // Select the pixel format for a given device context
- void SetDCPixelFormat(HDC hDC)
- {
- int nPixelFormat;
- static PIXELFORMATDESCRIPTOR pfd = {
- sizeof(PIXELFORMATDESCRIPTOR), // Size of this structure
- 1, // Version of this structure
- PFD_DRAW_TO_WINDOW | // Draw to Window (not to bitmap)
- PFD_SUPPORT_OPENGL | // Support OpenGL calls in window
- PFD_DOUBLEBUFFER, // Double buffered mode
- PFD_TYPE_RGBA, // RGBA Color mode
- 32, // Want 32 bit color
- 0,0,0,0,0,0, // Not used to select mode
- 0,0, // Not used to select mode
- 0,0,0,0,0, // Not used to select mode
- 16, // Size of depth buffer
- 0, // Not used to select mode
- 0, // Not used to select mode
- 0, // Draw in main plane
- 0, // Not used to select mode
- 0,0,0 }; // Not used to select mode
- // Choose a pixel format that best matches that described in pfd
- nPixelFormat = ChoosePixelFormat(hDC, &pfd);
- // Set the pixel format for the device context
- SetPixelFormat(hDC, nPixelFormat, &pfd);
- }
- // Entry point of all Windows programs
- int APIENTRY WinMain( HINSTANCE hInstance,
- HINSTANCE hPrevInstance,
- LPSTR lpCmdLine,
- int nCmdShow)
- {
- MSG msg; // Windows message structure
- WNDCLASS wc; // Windows class structure
- HWND hWnd; // Storeage for window handle
- // Register Window style
- wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
- wc.lpfnWndProc = (WNDPROC) WndProc;
- wc.cbClsExtra = 0;
- wc.cbWndExtra = 0;
- wc.hInstance = hInstance;
- wc.hIcon = NULL;
- wc.hCursor = LoadCursor(NULL, IDC_ARROW);
-
- // No need for background brush for OpenGL window
- wc.hbrBackground = NULL;
-
- wc.lpszMenuName = NULL;
- wc.lpszClassName = lpszAppName;
- // Register the window class
- if(RegisterClass(&wc) == 0)
- return FALSE;
- // Create the main application window
- hWnd = CreateWindow(
- lpszAppName,
- lpszAppName,
-
- // OpenGL requires WS_CLIPCHILDREN and WS_CLIPSIBLINGS
- WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN | WS_CLIPSIBLINGS,
-
- // Window position and size
- 100, 100,
- 250, 250,
- NULL,
- NULL,
- hInstance,
- NULL);
- // If window was not created, quit
- if(hWnd == NULL)
- return FALSE;
- // Display the window
- ShowWindow(hWnd,SW_SHOW);
- UpdateWindow(hWnd);
- // Process application messages until the application closes
- while( GetMessage(&msg, NULL, 0, 0))
- {
- TranslateMessage(&msg);
- DispatchMessage(&msg);
- }
- return msg.wParam;
- }
- // Window procedure, handles all messages for this program
- LRESULT CALLBACK WndProc( HWND hWnd,
- UINT message,
- WPARAM wParam,
- LPARAM lParam)
- {
- static HGLRC hRC; // Permenant Rendering context
- static HDC hDC; // Private GDI Device context
- switch (message)
- {
- // Window creation, setup for OpenGL
- case WM_CREATE:
- // Store the device context
- hDC = GetDC(hWnd);
- // Select the pixel format
- SetDCPixelFormat(hDC);
- // Create the rendering context and make it current
- hRC = wglCreateContext(hDC);
- wglMakeCurrent(hDC, hRC);
- // Create the palette
- hPalette = GetOpenGLPalette(hDC);
- SetupRC(hDC);
- break;
- // Window is being destroyed, cleanup
- case WM_DESTROY:
- // Kill the timer that we created
- KillTimer(hWnd,101);
- glDeleteLists(nFontList, 128);
- // Deselect the current rendering context and delete it
- wglMakeCurrent(hDC,NULL);
- wglDeleteContext(hRC);
- // Delete the palette
- if(hPalette != NULL)
- DeleteObject(hPalette);
- // Tell the application to terminate after the window
- // is gone.
- PostQuitMessage(0);
- break;
- // Window is resized.
- case WM_SIZE:
- // Call our function which modifies the clipping
- // volume and viewport
- ChangeSize(LOWORD(lParam), HIWORD(lParam));
- break;
- // The painting function. This message sent by Windows
- // whenever the screen needs updating.
- case WM_PAINT:
- {
- // Call OpenGL drawing code
- RenderScene();
- // Call function to swap the buffers
- SwapBuffers(hDC);
- ValidateRect(hWnd,NULL);
- }
- break;
- // Windows is telling the application that it may modify
- // the system palette. This message in essance asks the
- // application for a new palette.
- case WM_QUERYNEWPALETTE:
- // If the palette was created.
- if(hPalette)
- {
- int nRet;
- // Selects the palette into the current device context
- SelectPalette(hDC, hPalette, FALSE);
- // Map entries from the currently selected palette to
- // the system palette. The return value is the number
- // of palette entries modified.
- nRet = RealizePalette(hDC);
- // Repaint, forces remap of palette in current window
- InvalidateRect(hWnd,NULL,FALSE);
- return nRet;
- }
- break;
-
- // This window may set the palette, even though it is not the
- // currently active window.
- case WM_PALETTECHANGED:
- // Don't do anything if the palette does not exist, or if
- // this is the window that changed the palette.
- if((hPalette != NULL) && ((HWND)wParam != hWnd))
- {
- // Select the palette into the device context
- SelectPalette(hDC,hPalette,FALSE);
- // Map entries to system palette
- RealizePalette(hDC);
-
- // Remap the current colors to the newly realized palette
- UpdateColors(hDC);
- return 0;
- }
- break;
- default: // Passes it on if unproccessed
- return (DefWindowProc(hWnd, message, wParam, lParam));
- }
- return (0L);
- }