OpenGL（三）MFC中应用OpenGL的两个类-白红宇

OpenGL（三）MFC中应用OpenGL的两个类

阅读量：5092 次

发布时间：2019-06-13

本文共 4906 字，大约阅读时间需要 16 分钟。

网上找了下MFC中应用OpenGL的方法，总觉得不太方便，到处复制一堆堆函数，于是封装了两个类（CmyOpenGL和CRenderContex）。方便应用。

以MFC Dialog为例添加步骤：
- CXXXDlg中添加一CmyOpenGL成员（或指针，别忘记释放就行）
- 将三个成员函数对应加入（OnCreate、OnPaint、OnSize）MFC的消息映射函数中，传递相应参数（CmyOpenGL要利用CDC*所指对象，因此CDC*要在CmyOpenGL对象之后释放！）

代码：

CmyOpenGL.h

1 #pragma once  2 #include "RenderContex.h"  3  4 class CmyOpenGL  5 {
        6 public:  7     CmyOpenGL(void);  8     virtual ~CmyOpenGL(void);  9 public: 10     virtual void OnCreate(CDC* pDC); 11     virtual void OnPaint(void); 12     virtual void OnSize(int cx, int cy); 13 private: 14     virtual void RenderScene (void); 15 private: 16     CDC* m_pDC; 17     CRenderContex* m_pRC; 18 };

CmyOpenGL.cpp

1 #include "StdAfx.h"  2 #include "myOpenGL.h"  3  4 CmyOpenGL::CmyOpenGL(void)  5 {
        6     m_pDC = NULL;  7     m_pRC = NULL;  8 }  9 10 CmyOpenGL::~CmyOpenGL(void) 11 {
       12     if (m_pRC) 13     {
       14         delete m_pRC; 15     } 16     m_pRC = NULL; 17 } 18 19 void CmyOpenGL::OnCreate(CDC* pDC) 20 {
       21     ASSERT(pDC); 22     m_pRC = new CRenderContex(pDC); 23     ASSERT(m_pRC); 24 25     m_pDC = pDC; 26 27     //Specify Black as the clear color 28     ::glClearColor(0.0f,0.0f,0.0f,0.0f); 29 } 30 31 void CmyOpenGL::OnPaint() 32 {
       33     // Clear out the color & depth buffers 34     ::glClear( GL_COLOR_BUFFER_BIT); 35     RenderScene(); 36     // Tell OpenGL to flush its pipeline 37     ::glFinish(); 38     // Now Swap the buffers 39     ::SwapBuffers( m_pDC->GetSafeHdc() ); 40 } 41 42 void CmyOpenGL::OnSize(int cx, int cy) 43 {
       44     if ( 0 >= cx || 0 >= cy ) 45     {
       46         return; 47     } 48     // select the full client area 49     ::glViewport(0, 0, cx, cy); 50     // select the projection matrix and clear it 51     ::glMatrixMode(GL_PROJECTION); 52     ::glLoadIdentity(); 53     // select the viewing volume 54     ::gluPerspective(45.0f, (GLdouble)cx/(GLdouble)cy, 1.0f, 100.0f); 55     // switch back to the modelview matrix and clear it 56     ::glMatrixMode(GL_MODELVIEW); 57     ::glLoadIdentity(); 58 } 59 60 void CmyOpenGL::RenderScene (void) 61 {
       62     glTranslatef(0.0f, 0.0f, -5.0f); 63     glRotatef(45.0,0.0,1.0,0.0); 64     glutWireCube(1.0); 65 }

CRenderContex.h

1 #pragma once  2  3 class CRenderContex  4 {
        5 public:  6     CRenderContex(CDC *pDC);  7     ~CRenderContex(void);  8 private:  9     BOOL SetupPixelFormat(CDC *pDC);    //Set up the Pixel Format 10 private: 11     HGLRC m_hRC; 12 };

CRenderContex.cpp

1 #include "StdAfx.h"  2 #include "RenderContex.h"  3  4 CRenderContex::CRenderContex(CDC *pDC)  5 {
        6     ASSERT(pDC);  7  8     BOOL bResult = FALSE;  9     bResult = SetupPixelFormat(pDC); 10     ASSERT(bResult); 11 12     //Create Rendering Context 13     m_hRC = ::wglCreateContext (pDC->GetSafeHdc ()); 14     ASSERT(m_hRC); 15     //Make the RC Current 16     bResult = ::wglMakeCurrent (pDC->GetSafeHdc (), m_hRC); 17     ASSERT(bResult); 18 } 19 20 CRenderContex::~CRenderContex(void) 21 {
       22     BOOL bResult = FALSE; 23     //Make the RC non-current 24     bResult = ::wglMakeCurrent (0,0); 25     ASSERT(bResult); 26 27     //Delete the rendering context 28     bResult = ::wglDeleteContext (m_hRC); 29     ASSERT(bResult); 30 } 31 32 //Setup Pixel Format 33 BOOL CRenderContex::SetupPixelFormat(CDC *pDC) 34 {
       35     static PIXELFORMATDESCRIPTOR pfd = 36     {
       37         sizeof(PIXELFORMATDESCRIPTOR),  // size of this pfd 38         1,                              // version number 39         PFD_DRAW_TO_WINDOW |            // support window 40         PFD_SUPPORT_OPENGL |            // support OpenGL 41         PFD_DOUBLEBUFFER,               // double buffered 42         PFD_TYPE_RGBA,                  // RGBA type 43         24,                             // 24-bit color depth 44         0, 0, 0, 0, 0, 0,               // color bits ignored 45         0,                              // no alpha buffer 46         0,                              // shift bit ignored 47         0,                              // no accumulation buffer 48         0, 0, 0, 0,                     // accum bits ignored 49         16,                             // 16-bit z-buffer 50         0,                              // no stencil buffer 51         0,                              // no auxiliary buffer 52         PFD_MAIN_PLANE,                 // main layer 53         0,                              // reserved 54         0, 0, 0                         // layer masks ignored 55     }; 56     int m_nPixelFormat = ::ChoosePixelFormat(pDC->GetSafeHdc(), &pfd); 57     if ( m_nPixelFormat == 0 ) 58     {
       59         return FALSE; 60     } 61     if ( ::SetPixelFormat(pDC->GetSafeHdc(), m_nPixelFormat, &pfd) == FALSE) 62     {
       63         return FALSE; 64     } 65     return TRUE; 66 }