动态3D立方体（OpenGL图形编程）

/**
 * function：动态3D立方体
 * author:顾博君
 * time:2013-1-19
 * 编译器：codeblocks
 * 本程序为OpenGL代码，需要OpenGL的类库
 */
#include <windows.h>
#include <gl/gl.h>
#include <gl/glu.h>

char *className = "OpenGL";
char *windowName = "OpenGL Cube";
int winX = 0, winY = 0;
int winWidth = 300, winHeight = 300;
HDC hDC;
HGLRC hGLRC;
HPALETTE hPalette;
void init(void){
    //设置视图投影
    glMatrixMode(GL_PROJECTION);
    glFrustum(-0.5F,0.5F,-0.5F,0.5F,1.0F,3.0F);
    //视区定位
    glMatrixMode(GL_MODELVIEW);
    glTranslatef(0.0F,0.0F,-2.0F);
    //物体定位
    glRotatef(30.0F,1.0F,0.0F,0.0F);
    glRotatef(30.0F,0.0F,1.0F,0.0F);
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_LIGHTING);
    glEnable(GL_LIGHT0);
}
void redraw(HDC hDC){
    //清除颜色和深度缓冲区
    //glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
    //glClearDepth(2.0);
    glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT);
    //画立方体的6个面
    glBegin(GL_QUADS);
    glNormal3f( 0.0F, 0.0F, 1.0F);
    glVertex3f( 0.5f, 0.5f, 0.5f);
    glVertex3f(-0.5f, 0.5f, 0.5f);
    glVertex3f(-0.5f,-0.5f, 0.5f);
    glVertex3f( 0.5f,-0.5f, 0.5f);
    //1----------------------------
    glNormal3f( 0.0F, 0.0F,-1.0F);
    glVertex3f(-0.1f,-0.5f,-0.5f);
    glVertex3f(-0.5f, 0.5f,-0.5f);
    glVertex3f( 0.5f, 0.5f,-0.5f);
    glVertex3f( 0.5f,-0.5f,-0.5f);
    //2----------------------------
    glNormal3f( 0.0F, 1.0F, 0.0F);
    glVertex3f( 0.5f, 0.5f, 0.5f);
    glVertex3f( 0.5f, 0.5f,-0.5f);
    glVertex3f(-0.5f, 0.5f,-0.5f);
    glVertex3f(-0.5f, 0.5f, 0.5f);
    //3----------------------------
    glNormal3f( 0.0F,-1.0F, 0.0F);
    glVertex3f(-0.5f,-0.5f,-0.5f);
    glVertex3f( 0.5f,-0.5f,-0.5f);
    glVertex3f( 0.5f,-0.5f, 0.5f);
    glVertex3f(-0.5f,-0.5f, 0.5f);
    //4----------------------------
    glNormal3f( 1.0F, 0.0F, 0.0F);
    glVertex3f( 0.5f, 0.5f, 0.5f);
    glVertex3f( 0.5f,-0.5f, 0.5f);
    glVertex3f( 0.5f,-0.5f,-0.5f);
    glVertex3f( 0.5f, 0.5f,-0.5f);
    //5----------------------------
    glNormal3f(-1.0F, 0.0F, 0.0F);
    glVertex3f(-0.5f,-0.5f,-0.5f);
    glVertex3f(-0.5f,-0.5f, 0.5f);
    glVertex3f(-0.5f, 0.5f, 0.5f);
    glVertex3f(-0.5f, 0.5f,-0.5f);
    //6----------------------------*/
    glEnd();
    SwapBuffers(hDC);
}
void resize(void){
    //设置视区，使之覆盖整个窗口
    glViewport(0,0,winWidth,winHeight);
}
void setupPixelFormat(HWND hwnd, HDC* hDC, HGLRC* hRC){
    PIXELFORMATDESCRIPTOR pfd;

    int iFormat;

    /* get the device context (DC) */
    *hDC = GetDC(hwnd);

    /* set the pixel format for the DC */
    ZeroMemory(&pfd, sizeof(pfd));

    pfd.nSize = sizeof(pfd);//结构的大小
    pfd.nVersion = 1;//版本
    pfd.dwFlags = PFD_DRAW_TO_WINDOW |
                  PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;//支持双缓存
    pfd.iPixelType = PFD_TYPE_RGBA;//颜色模式
    pfd.cColorBits = 24;
    pfd.cDepthBits = 16;//颜色深度
    pfd.iLayerType = PFD_MAIN_PLANE;//主层

    iFormat = ChoosePixelFormat(*hDC, &pfd);//确定pfd结构是否存在

    SetPixelFormat(*hDC, iFormat, &pfd);

    /* create and enable the render context (RC) */
    *hRC = wglCreateContext(*hDC);

    wglMakeCurrent(*hDC, *hRC);


    /*if(iFormat == 0){
        MessageBox(WindowFromDC(hDC),"ChoosePixelFormat failed.",
                   "Error",MB_ICONERROR|MB_OK);
        exit(1);
    }
    if(SetPixelFormat(hDC,iFormat,&pfd)!=TRUE){
        MessageBox(WindowFromDC(hDC),"SetPixelFormat failed.",
                   "Error",MB_ICONERROR|MB_OK);
        exit(1);
    }*/
}
void setupPalette(HDC hDC){
    int pixelFormat = GetPixelFormat(hDC);
    PIXELFORMATDESCRIPTOR pfd;
    LOGPALETTE* pPal;
    int paletteSize;
    DescribePixelFormat(hDC,pixelFormat,
                        sizeof(PIXELFORMATDESCRIPTOR),&pfd);
    if(pfd.dwFlags & PFD_NEED_PALETTE){
        paletteSize = 1 << pfd.cColorBits;
    }
    else{
        return ;
    }
    pPal = (LOGPALETTE*)malloc(sizeof(LOGPALETTE)+paletteSize*sizeof(PALETTEENTRY));
    pPal->palVersion=0x300;
    pPal->palNumEntries = paletteSize;
    //建一个简单的RGB调色板
    {
        int redMask = (1 << pfd.cRedBits) - 1;
        int greemMask = (1 << pfd.cGreenBits) - 1;
        int blueMask = (1 << pfd.cBlueBits) - 1;
        int i;
        for(i=0;i<paletteSize;i++){
            pPal->palPalEntry[i].peRed =
            (((i >> pfd.cRedShift) & redMask) * 255)/redMask;
            //pPal->palPalEntry[i]-peGreen =

        }
    }

}




LRESULT CALLBACK WindowProc(HWND, UINT, WPARAM, LPARAM);
void EnableOpenGL(HWND hwnd, HDC*, HGLRC*);
void DisableOpenGL(HWND, HDC, HGLRC);


int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    WNDCLASSEX wcex;
    HWND hwnd;
    HDC hDC;
    HGLRC hRC;
    MSG msg;
    BOOL bQuit = FALSE;
    float theta = 0.0f;

    /* register window class */
    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style = CS_HREDRAW|CS_VREDRAW;//CS_OWNDC;
    wcex.lpfnWndProc = WindowProc;
    wcex.cbClsExtra = 0;
    wcex.cbWndExtra = 0;
    wcex.hInstance = hInstance;
    wcex.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = "GLSample";
    wcex.hIconSm = LoadIcon(NULL, IDI_APPLICATION);;


    if (!RegisterClassEx(&wcex))
        return 0;

    /* create main window */
    hwnd = CreateWindowEx(0,
                          "GLSample",
                          windowName,//"OpenGL Sample",
                          WS_OVERLAPPEDWINDOW/*后面是后来加的*/|WS_CLIPCHILDREN|WS_CLIPSIBLINGS,
                          winX,//CW_USEDEFAULT,
                          winY,//CW_USEDEFAULT,
                          winWidth,//256,
                          winHeight,//256,
                          NULL,
                          NULL,
                          hInstance,
                          NULL);

    ShowWindow(hwnd, nCmdShow);

    /* enable OpenGL for the window */
    //setupPixelFormat(hwnd, &hDC, &hRC);
    EnableOpenGL(hwnd, &hDC, &hRC);
    init();

    /* program main loop */
    while (!bQuit)
    {
        /* check for messages */
        if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            /* handle or dispatch messages */
            if (msg.message == WM_QUIT)
            {
                bQuit = TRUE;
            }
            else
            {
                TranslateMessage(&msg);
                DispatchMessage(&msg);
            }
        }
        else if(0)
        {
            /* OpenGL animation code goes here */

            glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
            glClear(GL_COLOR_BUFFER_BIT);


            glPushMatrix();
            glRotatef(theta, 0.0f, 0.0f, 1.0f);

            glBegin(GL_TRIANGLES);

                glColor3f(1.0f, 0.0f, 0.0f);   glVertex2f(0.0f,   1.0f);
                glColor3f(0.0f, 1.0f, 0.0f);   glVertex2f(0.87f,  -0.5f);
                glColor3f(0.0f, 0.0f, 1.0f);   glVertex2f(-0.87f, -0.5f);

            glEnd();

            glPopMatrix();

            SwapBuffers(hDC);

            theta += 1.0f;
            //Sleep (1);
        }
        else{
            glPushMatrix();
            glRotatef(theta, 0.0f, 0.0f, 1.0f);
            redraw(hDC);//立方体  需要初始化init（）函数
            glPopMatrix();
            theta += 1.0f;
        }
    }

    /* shutdown OpenGL */
    DisableOpenGL(hwnd, hDC, hRC);

    /* destroy the window explicitly */
    DestroyWindow(hwnd);

    return msg.wParam;
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
        /*case WM_CREATE:
            hDC = GetDC(hwnd);
            setupPalette(hDC);
            hGLRC=wglCreateContext(hDC);
            wglMakeCurrent(hDC,hGLRC);
            init();
            return 0;*/
        case WM_CLOSE:
            PostQuitMessage(0);
        break;

        case WM_DESTROY:
            /*//------------------
            if(hGLRC){
                wglMakeCurrent(NULL,NULL);
                wglDeleteContext(hGLRC);
            }
            if(hPalette){
                DeleteObject(hPalette);
            }
            ReleaseDC(hwnd,hDC);
            PostQuitMessage(0);
            //====================*/
            return 0;
        //------------------------
        case WM_SIZE:
            //跟踪窗口大小改变
            hGLRC=1;
            if(hGLRC){
                winWidth=(int)LOWORD(lParam);
                winHeight=(int)LOWORD(lParam);
                resize();
                return 0;
            }
        case WM_PALETTECHANGED:
            //如果它不是当前窗口，则实现调色板与hDC的对应
            if(hGLRC && hPalette && (HWND) wParam != hwnd){
                UnrealizeObject(hPalette);
                SelectPalette(hDC,hPalette,FALSE);
                //ReadlizePalette(hDC);
                redraw(hDC);
                break;
            }
        break;
        //=========================
        case WM_KEYDOWN:
        {
            switch (wParam)
            {
                case VK_ESCAPE:
                    PostQuitMessage(0);
                break;
            }
        }
        break;

        default:
            return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }

    return 0;
}

void EnableOpenGL(HWND hwnd, HDC* hDC, HGLRC* hRC)
{
    PIXELFORMATDESCRIPTOR pfd;

    int iFormat;

    /* get the device context (DC) */
    *hDC = GetDC(hwnd);

    /* set the pixel format for the DC */
    ZeroMemory(&pfd, sizeof(pfd));

    pfd.nSize = sizeof(pfd);
    pfd.nVersion = 1;
    pfd.dwFlags = PFD_DRAW_TO_WINDOW |
                  PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
    pfd.iPixelType = PFD_TYPE_RGBA;
    pfd.cColorBits = 24;
    pfd.cDepthBits = 16;
    pfd.iLayerType = PFD_MAIN_PLANE;

    iFormat = ChoosePixelFormat(*hDC, &pfd);

    SetPixelFormat(*hDC, iFormat, &pfd);

    /* create and enable the render context (RC) */
    *hRC = wglCreateContext(*hDC);

    wglMakeCurrent(*hDC, *hRC);
}

void DisableOpenGL (HWND hwnd, HDC hDC, HGLRC hRC)
{
    wglMakeCurrent(NULL, NULL);
    wglDeleteContext(hRC);
    ReleaseDC(hwnd, hDC);
}