Nehe的OpenGL框架(MFC版)

野性酷女 2022-04-01 10:50 266阅读 0赞

Nehe的几个OpenGL框架都是Win32 sdk版本的，我现在需要在MFC下学习OpenGL,今天看了他写的第一个OpenGL框架，就在MFC中实现了下。为了简单起见，把全屏那部分就抛弃掉了，毕竟重点不在这上面，而且MFC要实现这个全屏的功能也不像sdk那么容易。。。

//  openGLDemoView.h : interface of the COpenGLDemoView class  
 //  
 /// //   
 protected :  
BOOL SetWindowPixelFormat(HDC hDC); // 设置像素格式   
  BOOL CreateViewGLContext(HDC hDC); // 创建绘制环境(RC)并使之成为当前绘制环境   
  BOOL InitGL(GLvoid); // 初始化openGL   
  int  DrawGLScene(GLvoid); // 绘图代码区   
  int  m\_GLPixelIndex;  
HGLRC m\_hGLContext; // 绘制环境

//  openGLDemoView.cpp : implementation of the COpenGLDemoView class  
 //  
 COpenGLDemoView::COpenGLDemoView()  
\{  
 //  TODO: add construction code here   
  this \-> m\_GLPixelIndex  =  0 ;  
 this \-> m\_hGLContext  =  NULL;  
\}  
  
BOOL COpenGLDemoView::PreCreateWindow(CREATESTRUCT &  cs)  
\{  
 //  TODO: Modify the Window class or styles here by modifying  
 //  the CREATESTRUCT cs   
  cs.style  |=  (WS\_CLIPCHILDREN  |  WS\_CLIPSIBLINGS); // openGL必需的   
  return  CView::PreCreateWindow(cs);  
\}  
  
BOOL COpenGLDemoView::SetWindowPixelFormat(HDC hDC)  
\{  // 定义窗口的像素格式   
  PIXELFORMATDESCRIPTOR pixelDesc =   
\{  
 sizeof (PIXELFORMATDESCRIPTOR),  
 1 ,  
PFD\_DRAW\_TO\_WINDOW | PFD\_SUPPORT\_OPENGL |   
PFD\_DOUBLEBUFFER | PFD\_SUPPORT\_GDI,  
PFD\_TYPE\_RGBA,  
 24 ,  
 0 , 0 , 0 , 0 , 0 , 0 ,  
 0 ,  
 0 ,  
 0 ,  
 0 , 0 , 0 , 0 ,  
 32 ,  
 0 ,  
 0 ,  
PFD\_MAIN\_PLANE,  
 0 ,  
 0 , 0 , 0   
\};  
  
 this \-> m\_GLPixelIndex  =  ChoosePixelFormat(hDC, & pixelDesc); // 选择最相近的像素格式   
  if ( this \-> m\_GLPixelIndex == 0 )  
\{  // 选择失败   
  this \-> m\_GLPixelIndex  =  1 ; // 默认的像素格式   
  if (DescribePixelFormat(hDC, this \-> m\_GLPixelIndex, sizeof (PIXELFORMATDESCRIPTOR), & pixelDesc) == 0 )  
\{  // 用默认的像素格式进行设置   
  return  FALSE;  
\}  
\}  
  
 if (SetPixelFormat(hDC, this \-> m\_GLPixelIndex, & pixelDesc) == FALSE)  
\{  
 return  FALSE;  
\}  
 return  TRUE;  
\}  
  
BOOL COpenGLDemoView::InitGL(GLvoid)  //  All Setup For OpenGL Goes Here   
 \{  
glShadeModel(GL\_SMOOTH);  //  Enable Smooth Shading   
  glClearColor( 0.0 , 0.0 , 0.0 , 0.0 ); //  Black Background   
  glClearDepth( 1.0f );  //  Depth Buffer Setup   
  glEnable(GL\_DEPTH\_TEST);  //  Enables Depth Testing   
  glDepthFunc(GL\_LEQUAL);  //  The Type Of Depth Testing To Do   
  glHint(GL\_PERSPECTIVE\_CORRECTION\_HINT, GL\_NICEST);  //  Really Nice Perspective Calculations   
  return  TRUE;  //  Initialization Went OK   
 \}  
  
BOOL COpenGLDemoView::CreateViewGLContext(HDC hDC)  
\{  
 this \-> m\_hGLContext  =  wglCreateContext(hDC); // 创建RC   
  if ( this \-> m\_hGLContext == NULL)  
\{  // 创建失败   
  return  FALSE;  
\}  
  
 if (wglMakeCurrent(hDC, this \-> m\_hGLContext) == FALSE)  
\{  // 选为当前RC失败   
  return  FALSE;  
\}  
 return  TRUE;  
\}  
 int  COpenGLDemoView::OnCreate(LPCREATESTRUCT lpCreateStruct)  
\{  
 if  (CView::OnCreate(lpCreateStruct)  ==  \- 1 )  
 return  \- 1 ;  
  
 //  TODO: Add your specialized creation code here   
  HWND hWnd  =  this \-> GetSafeHwnd();  
HDC hDC  =  ::GetDC(hWnd);  
  
 if ( this \-> SetWindowPixelFormat(hDC) == FALSE)  
\{  // 设置像素格式   
  return  0 ;  
\}  
 if ( this \-> CreateViewGLContext(hDC) == FALSE)  
\{  // 创建RC并选为所用   
  return  0 ;  
\}  
 if ( ! this \-> InitGL())  
\{  // 初始化openGL   
  return  0 ;  
\}  
 return  0 ;  
\}  
 void  COpenGLDemoView::OnDestroy()  
\{  
CView::OnDestroy();  
  
 //  TODO: Add your message handler code here   
  if (wglGetCurrentContext() != NULL)  
\{  
wglMakeCurrent(NULL,NULL);  
\}  
 if ( this \-> m\_hGLContext != NULL)  
\{  
wglDeleteContext( this \-> m\_hGLContext);  
 this \-> m\_hGLContext  =  NULL;  
\}  
\}  
 void  COpenGLDemoView::OnSize(UINT nType,  int  cx,  int  cy)  
\{  
CView::OnSize(nType, cx, cy);  
  
 //  TODO: Add your message handler code here   
  GLsizei width,height;  
width  =  cx;  
height  =  cy;  
 if  (height == 0 )  //  Prevent A Divide By Zero By   
  \{  
height = 1 ;  //  Making Height Equal One   
  \}  
  
glViewport( 0 , 0 ,width,height);  //  Reset The Current Viewport   
   
glMatrixMode(GL\_PROJECTION);  //  Select The Projection Matrix   
  glLoadIdentity();  //  Reset The Projection Matrix  
 //  Calculate The Aspect Ratio Of The Window   
  gluPerspective( 45.0f ,(GLfloat)width / (GLfloat)height, 0.1f , 100.0f ); // 透视投影   
  glMatrixMode(GL\_MODELVIEW);  //  Select The Modelview Matrix   
  glLoadIdentity();  //  Reset The Modelview Matrix   
 \}  
 void  COpenGLDemoView::OnPaint()  
\{  
CPaintDC dc( this );  //  device context for painting   
  this \-> DrawGLScene();  
\}  
  
 int  COpenGLDemoView::DrawGLScene(GLvoid)  
\{  //  Here's Where We Do All The Drawing   
  glClear(GL\_COLOR\_BUFFER\_BIT  |  GL\_DEPTH\_BUFFER\_BIT);  //  Clear Screen And Depth Buffer   
  glLoadIdentity();  //  Reset The Current Modelview Matrix   
  glTranslatef( \- 1.5f , 0.0f , \- 6.0f ); // 物体左移1.5,向内移6,相当于移动镜头一样，让物体进入镜头中   
  glBegin(GL\_TRIANGLES);  //  绘制三角形   
  glColor3f( 255.0f , 0.0f , 0.0f );  
glVertex3f(  0.0f ,  1.0f ,  0.0f );  //  上顶点   
  glColor3f( 0.0f , 255.0f , 0.0f );  
glVertex3f( \- 1.0f , \- 1.0f ,  0.0f );  //  左下   
  glColor3f( 0.0f , 0.0f , 255.0f );  
glVertex3f(  1.0f , \- 1.0f ,  0.0f );  //  右下   
  glEnd();  //  三角形绘制结束   
 glTranslatef( 3.0f , 0.0f , 0.0f );  
glBegin(GL\_QUADS);  //  绘制正方形   
  glColor3f( 255.0f , 0.0f , 0.0f );  
glVertex3f( \- 1.0f ,  1.0f ,  0.0f );  //  左上   
  glColor3f( 0.0f , 255.0f , 0.0f );  
glVertex3f(  1.0f ,  1.0f ,  0.0f );  //  右上   
  glColor3f( 0.0f , 0.0f , 255.0f );  
glVertex3f(  1.0f , \- 1.0f ,  0.0f );  //  左下   
  glColor3f( 255.255f , 255.0f , 255.0f );  
glVertex3f( \- 1.0f , \- 1.0f ,  0.0f );  //  右下   
  glEnd();  //  正方形绘制结束   
  glFlush();  
 return  TRUE;  //  Everything Went OK   
 \}

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[200772901..jpg]: /images/20220401/ed69a417f6414ec5a303ae8ed8066858.png