MFC初始化OpenGL编程环境

//库文件

opengl32.lib

glu32.lib

// odemoView.h : CodemoView 类的接口

#include <windows.h>
#include <gl\gl.h>
#include <gl\glu.h>

 

public:
  afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
  afx_msg void OnDestroy();
  afx_msg void OnSize(UINT nType, int cx, int cy);

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;//像素格式索引
  HGLRC m_hGLContext;//绘制环境

// odemoView.cpp : CodemoView 类的实现

CodemoView::CodemoView()
{
  // TODO: 在此处添加构造代码
  this->m_GLPixelIndex = 0;
  this->m_hGLContext = NULL;
}

BOOL CodemoView::PreCreateWindow(CREATESTRUCT& cs)
{
  // TODO: 在此处通过修改
  // CREATESTRUCT cs 来修改窗口类或样式
  cs.style |= (WS_CLIPCHILDREN | WS_CLIPSIBLINGS);//openGL必需的
  return CView::PreCreateWindow(cs);
}

BOOL CodemoView::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 CodemoView::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 CodemoView::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 CodemoView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (CView::OnCreate(lpCreateStruct) == -1)
        return -1;
    // TODO:  在此添加您专用的创建代码
    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 CodemoView::OnDestroy()
{
    CView::OnDestroy();
    // TODO: 在此处添加消息处理程序代码
    if(wglGetCurrentContext()!=NULL)
    {
        wglMakeCurrent(NULL,NULL);
    }
    if(this->m_hGLContext!=NULL)
    {
        wglDeleteContext(this->m_hGLContext);
        this->m_hGLContext = NULL;
    }
}

void CodemoView::OnSize(UINT nType, int cx, int cy)
{
    CView::OnSize(nType, cx, cy);
    // TODO: 在此处添加消息处理程序代码
    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
}

int CodemoView::DrawGLScene(GLvoid) 
{//在这里写绘图代码

}

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