Lesson 8 Nehe
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#include <gl/opengl.h>#include <stdio.h>HGLRC hRC = NULL;HDC hDC = NULL;HWND hWnd = NULL;HINSTANCE hInstance = NULL;BOOL keys[256];BOOL active = TRUE;BOOL fullscreen = FALSE;BOOL light = TRUE; // 光源开关BOOL lp = TRUE; // L键按下了吗？BOOL fp; // F键按下了吗？GLfloat xRote;GLfloat yRote;GLfloat xStep = 0.1f; // X旋转速度GLfloat yStep = 0.1f; // Y 旋转速度GLfloat z = -5.0f; // 深入屏幕的距离BOOL blend; // 是否混合BOOL bp; // B键是否按下GLfloat LightAmbient[] = {0.5f, 0.5f, 0.5f, 1.0f}; //环境光参数GLfloat LightDiffuse[] = {1.0f, 1.0f, 1.0f, 1.0f}; //漫射光参数数GLfloat LightPosition[] = {0.0f, 0.0f, 2.0f, 1.0f}; //光源位置GLuint filter = 0; // 跟踪采用何种纹理GLuint texture[3]; // 存三个纹理LRESULT CALLBACK WindowProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);AUX_RGBImageRec* LoadBMP(char* FileName){ FILE *File = NULL; if (!FileName){ MessageBox(NULL, "文件未存在", "错误", MB_OK|MB_ICONEXCLAMATION); return NULL; } File = fopen(FileName, "r"); if (!File){ MessageBox(NULL, "文件未能正常打开", "错误", MB_OK|MB_ICONEXCLAMATION); return NULL; } fclose(File); return auxDIBImageLoad(FileName);}BOOL LoadGLTexture(char* Filename, GLuint* texture){ BOOL Status = FALSE; AUX_RGBImageRec *TextureImage[1]; memset(TextureImage, 0, sizeof(void*)*1); if (TextureImage[0] = LoadBMP(Filename)){ Status = TRUE; // 创建三个纹理 glGenTextures(3, texture); /////////////////////////////////////////////////// glBindTexture(GL_TEXTURE_2D, texture[0]); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data); //////////////////////////////////////////////////////// glBindTexture(GL_TEXTURE_2D, texture[1]); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data); //////////////////////////////////////////////////////// glBindTexture(GL_TEXTURE_2D, texture[2]); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); gluBuild2DMipmaps(GL_TEXTURE_2D, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data); } if (TextureImage[0]){ if (TextureImage[0]->data) free(TextureImage[0]->data); free(TextureImage[0]); } return Status;}GLvoid ReSizeGLScene(GLsizei width, GLsizei height){ // 如果高为0 ， 则设置其为1 if (height == 0) height = 1; // 设置可以看到的视角 glViewport(0,0,width, height); // 设置投影矩阵 glMatrixMode(GL_PROJECTION); glLoadIdentity(); // 设置平截头体 gluPerspective(45.0f, (GLdouble)width/(GLdouble)height, 0.1f, 100.0f); // 设置模型矩阵 glMatrixMode(GL_MODELVIEW); glLoadIdentity();}GLvoid InitGL(){ if (!LoadGLTexture("Data/Glass.bmp", &texture[0])){ MessageBox(NULL, "载入纹理失败", "错误", MB_OK|MB_ICONEXCLAMATION); exit(1); } // 混合初始化 glColor4f(1.0f, 1.0f, 1.0f, 0.5f); glBlendFunc(GL_SRC_ALPHA, GL_ONE); // 开启光照 glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient); // 设置环境光 glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse); // 设置漫射光 glLightfv(GL_LIGHT1, GL_POSITION, LightPosition); // 光源位置 glEnable(GL_LIGHT1); //glEnable(GL_LIGHTING); glEnable(GL_TEXTURE_2D); glShadeModel(GL_SMOOTH); glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // 1.0f 为最大深度 glClearDepth(1.0f); glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LEQUAL); glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);}GLvoid DrawGLScene(){ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); // 重置坐标系 glTranslatef(0.0f, 0.0f, z); glRotatef(xRote, 1.0f, 0.0f, 0.0f); glRotatef(yRote, 0.0f, 1.0f, 0.0f); glBindTexture(GL_TEXTURE_2D, texture[filter]); // 画正方体 glBegin(GL_QUADS); // 前面 glNormal3f(0.0f, 0.0f, 1.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,-1.0f, 1.0f); // A glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f); // B glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f); // C glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,-1.0f, 1.0f); // D // 右面 glNormal3f(1.0f, 0.0f, 0.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f,-1.0f, 1.0f); // D glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f); // C glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f,-1.0f); // E glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,-1.0f,-1.0f); // F //后面 glNormal3f(0.0f, 0.0f,-1.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f,-1.0f,-1.0f); // F glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f,-1.0f); // E glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f,-1.0f); // G glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f,-1.0f,-1.0f); // H //左面 glNormal3f(-1.0f, 0.0f, 0.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,-1.0f,-1.0f); // H glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f,-1.0f); // G glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f); // B glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f,-1.0f, 1.0f); // A //上面 glNormal3f(0.0f, 1.0f, 0.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f); // B glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f,-1.0f); // G glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f,-1.0f); // E glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 1.0f); // C //下面 glNormal3f(0.0f,-1.0f, 0.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,-1.0f,-1.0f); // H glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,-1.0f, 1.0f); // A glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,-1.0f, 1.0f); // D glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,-1.0f,-1.0f); // F glEnd(); if (xRote>= 360.0f) xRote = 0.0f; if (yRote>= 360.0f) yRote = 0.0f; xRote += xStep; yRote += yStep;}GLvoid KillGLWindow(){ if (fullscreen){ ChangeDisplaySettings(NULL, 0); ShowCursor(FALSE); } if (hRC){ if (!wglMakeCurrent(NULL, NULL)) MessageBox(NULL, "释放DC 或 RC 失败", "错误", MB_OK); if (!wglDeleteContext(hRC)) MessageBox(NULL, "释放RC失败", "错误", MB_OK); hRC = NULL; } // ReleaseDC 失败返回0， 成功返回非0 if (hDC && !ReleaseDC(hWnd, hDC)){ MessageBox(NULL, "释放DC失败", "错误", MB_OK); hDC = NULL; } if (hWnd && !DestroyWindow(hWnd)){ MessageBox(NULL, "销毁窗口失败", "错误", MB_OK); hWnd = NULL; } if (!UnregisterClass("opengl", hInstance)){ MessageBox(NULL, "反注册失败", "错误", MB_OK); hInstance = NULL; }}bool CreateGLWindow(char* title, int width, int height, int bits, HINSTANCE hInstance, bool fullscreenflag){ GLuint PixelFormat; WNDCLASS wc; DWORD dwStyle; DWORD dwExStyle; RECT WindowRect; WindowRect.left = (long)0; WindowRect.right= (long)width; WindowRect.top = (long)0; WindowRect.bottom = (long)height; fullscreen = fullscreenflag; wc.hInstance = hInstance; wc.cbClsExtra = 0; wc.cbWndExtra = 0; wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; wc.lpfnWndProc = WindowProc; wc.hIcon = LoadIcon(NULL, IDI_WINLOGO); wc.hCursor = LoadCursor(NULL, IDC_ARROW); wc.hbrBackground = NULL; wc.lpszClassName = "opengl"; wc.lpszMenuName = NULL; // 注册窗口类 if (!RegisterClass(&wc)){ MessageBox(NULL, "窗口注册失败", "错误", MB_OK); return FALSE; } if (fullscreen){ DEVMODE dmScreenSetting; memset(&dmScreenSetting, 0, sizeof(dmScreenSetting)); dmScreenSetting.dmSize = sizeof(dmScreenSetting); dmScreenSetting.dmBitsPerPel = bits; dmScreenSetting.dmPelsHeight = height; dmScreenSetting.dmPelsWidth = width; dmScreenSetting.dmFields = DM_BITSPERPEL | DM_PELSHEIGHT | DM_PELSWIDTH; // 设置显示模式 if (ChangeDisplaySettings(&dmScreenSetting, CDS_FULLSCREEN)!= DISP_CHANGE_SUCCESSFUL){ if (MessageBox(NULL, "当前显卡不支持全屏操做\n使用窗口模式?", "错误", MB_YESNO|MB_ICONEXCLAMATION) == IDYES){ fullscreen = FALSE; } else{ MessageBox(NULL, "程序将会被关闭", "错误", MB_OK|MB_ICONEXCLAMATION); return false; } } } if (fullscreen){ dwExStyle = WS_EX_APPWINDOW; dwStyle = WS_POPUP; ShowCursor(FALSE); } else{ dwExStyle = WS_EX_APPWINDOW | WS_EX_WINDOWEDGE; dwStyle = WS_OVERLAPPEDWINDOW; //ShowCursor(TRUE); } dwStyle = dwStyle | WS_CLIPCHILDREN|WS_CLIPSIBLINGS; AdjustWindowRectEx(&WindowRect, dwStyle, FALSE, dwExStyle); if (!(hWnd = CreateWindowEx(dwExStyle, "opengl", title, dwStyle, 0,0, WindowRect.right-WindowRect.left, WindowRect.bottom-WindowRect.top, NULL, NULL, hInstance, NULL))){ KillGLWindow(); MessageBox(NULL, "不能创建一个窗口设备描述表", "错误", MB_OK); return false; } static PIXELFORMATDESCRIPTOR pfd = { sizeof(PIXELFORMATDESCRIPTOR), 1, PFD_DRAW_TO_WINDOW| PFD_SUPPORT_OPENGL| PFD_DOUBLEBUFFER, PFD_TYPE_RGBA, bits, 0, 0, 0, 0, 0, 0, // 忽略的色彩位 0, // 无Alpha缓存 0, // 忽略Shift Bit 0, // 无累加缓存 0, 0, 0, 0, // 忽略聚集位 16, // 16位 Z-缓存 (深度缓存) 0, // 无蒙板缓存 0, // 无辅助缓存 PFD_MAIN_PLANE, // 主绘图层 0, // Reserved 0, 0, 0 // 忽略层遮罩 }; if (!(hDC = GetDC(hWnd))){ KillGLWindow(); MessageBox(NULL, "不能创建一个相匹配的像素模式", "错误", MB_OK|MB_ICONEXCLAMATION); return false; } if (!(PixelFormat = ChoosePixelFormat(hDC, &pfd))){ KillGLWindow(); MessageBox(NULL, "不能设置像素格式", "错误", MB_OK|MB_ICONEXCLAMATION); return false; } if (!SetPixelFormat(hDC, PixelFormat, &pfd)){ KillGLWindow(); MessageBox(NULL, "不能设置像素格式", "错误",MB_OK|MB_ICONEXCLAMATION); return false; } if (!(hRC = wglCreateContext(hDC))){ KillGLWindow(); MessageBox(NULL, "不能创建当前的opengl渲染描述表", "错误", MB_OK|MB_ICONEXCLAMATION); return false; } if (!wglMakeCurrent(hDC, hRC)){ KillGLWindow(); MessageBox(NULL, "不能激活当前的opengl渲染描述表", "错误", MB_OK); return false; } ShowWindow(hWnd, SW_SHOW); // 激活窗口 SetForegroundWindow(hWnd); // 接收键盘信息 SetFocus(hWnd); ReSizeGLScene(width, height); InitGL(); return true;}LRESULT CALLBACK WindowProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam ){ switch(uMsg){ case WM_ACTIVATE: { if (!HIWORD(wParam)) active = TRUE; else active = FALSE; return 0; } case WM_CLOSE: { PostQuitMessage(0); return 0; } case WM_KEYUP: { keys[wParam] = FALSE; return 0; } case WM_KEYDOWN: { keys[wParam] = TRUE; return 0; } case WM_SIZE: { ReSizeGLScene(LOWORD(lParam), HIWORD(lParam)); return 0; } } return DefWindowProc(hwnd, uMsg, wParam, lParam);}int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow ){ MSG msg; BOOL done = FALSE; if (MessageBox(NULL, "是否在全屏模式下运行?", "提示", MB_YESNO|MB_ICONEXCLAMATION) == IDYES) fullscreen = TRUE; if (!CreateGLWindow("Lesson 7", 640, 480, 16, hInstance, fullscreen)) return 0; while (!done){ if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)){ if (msg.message == WM_QUIT) done = TRUE; else{ TranslateMessage(&msg); DispatchMessage(&msg); } } else { if (active) { if (keys[VK_ESCAPE]) done = TRUE; else{ DrawGLScene(); SwapBuffers(hDC); } // 判断L 键按下， 并进行功能 if (keys['L'] && !lp){ lp = TRUE; if (light) glEnable(GL_LIGHTING); else glDisable(GL_LIGHTING); light = !light; } if (!keys['L']){ lp = FALSE; } // 判断F键，并进行功能 if (keys['F'] && fp){ fp = TRUE; filter++; if (filter >2) filter = 0; } if (keys['F']){ fp = FALSE; } // PageUp if (keys[VK_PRIOR]){ z -= 0.05f; } // Page Down if (keys[VK_NEXT]){ z += 0.05F; } // 上 下 左 右 四个键 if (keys[VK_UP]){ xStep += 0.01f; } if (keys[VK_DOWN]) xStep -= 0.01f; if (keys[VK_LEFT]) yStep += 0.01f; if (keys[VK_RIGHT]) yStep -= 0.01f; // 判断B键是否被搂下 if (keys['B'] && !bp){ bp = TRUE; if (blend){ glEnable(GL_BLEND); glDisable(GL_DEPTH_TEST); } else{ glEnable(GL_DEPTH_TEST); glDisable(GL_BLEND); } blend = !blend; } if (!keys['B']){ bp = FALSE; } // 判断F1 if (keys[VK_F1]){ keys[VK_F1] = FALSE; KillGLWindow(); fullscreen = !fullscreen; if (!CreateGLWindow("Lesson 7", 640, 480, 16, hInstance, fullscreen)) return 0; } } } } KillGLWindow(); return (msg.wParam);}
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