Nehe教程第9课移动图像

源文件及资源链接Nehe教程第9课移动图像程序及资源

BOOL twinkle; //闪烁的星星

BOOL tp; //T是否按下？

const int num=50; //绘制的星星数 中文教程网站少了int

typedef struct tagSTARS //为星星创建一个结构，原教程为stars，这里改为tagSTARS和STARS
{
int r,g,b; //星星颜色
GLfloat dist; //离屏幕中心距离
GLfloat angle;// 当前星星所处的角度


}STARS;

源代码

#include <windows.h>// Windows的头文件#include <gl/glew.h>// 包含最新的gl.h,glu.h库#include <gl/glut.h>// 包含OpenGL实用库#include <gl/glaux.h>// GLaux库的头文件#include <stdio.h>// 标准输入/输出库的头文件HGLRC hRC=NULL;//窗口着色描述表句柄HDC hDC=NULL;//设备渲染描述表句柄HWND hWND=NULL;//窗口句柄HINSTANCE hInstance;//保存程序的实例bool keys[256];bool active=TRUE;//窗口的活动状态，缺省为truebool fullscreen=TRUE;//全屏的缺省状态=trueBOOL twinkle;//闪烁的星星BOOL tp;//T是否按下？const int num=50;//绘制的星星数typedef struct tagSTARS//为星星创建一个结构{int r,g,b;//星星颜色GLfloat dist;//离屏幕中心距离GLfloat angle;// 当前星星所处的角度}STARS;STARS star[num];GLfloat zoom=-15.0f;//星星离观察者的角度GLfloat tilt=90.0f;//星星的倾角GLfloat spin;//闪烁星星的自传GLuint loop;//全局loop变量GLuint texture[1];//存放一个纹理LRESULT CALLBACK WndProc(HWND, UINT,WPARAM, LPARAM);AUX_RGBImageRec *LoadBMP(char*Filename){FILE *File=NULL;if (!Filename)//确保文件名已提供{return NULL;}File=fopen(Filename,"r");if (File)// 文件存在么?{fclose(File);return auxDIBImageLoad(Filename);// 载入位图并返回指针}return NULL;}int LoadGLTextures()//载入位图(调用上面的代码)并转换成纹理{int Status=FALSE;AUX_RGBImageRec *TextureImage[1];// 创建纹理的存储空间memset(TextureImage,0,sizeof(void *)*1);// 将指针设为 NULLif (TextureImage[0]=LoadBMP("Data/Star.bmp")){Status=true;glGenTextures(1,&texture[0]);glBindTexture(GL_TEXTURE_2D,texture[0]);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);glTexImage2D(GL_TEXTURE_2D,0,3,TextureImage[0]->sizeX,TextureImage[0]->sizeY,0,GL_RGB,GL_UNSIGNED_BYTE,TextureImage[0]->data);}if (TextureImage[0])//纹理是否存在{if (TextureImage[0]->data)//纹理图像是否存在{free(TextureImage[0]->data);//释放纹理图像占用的内存}free(TextureImage[0]);//释放图像结构}return Status;}GLvoid ReSizeGLScene(GLsizei width,GLsizei height){if (height==0){height=1;}glViewport(0,0,width, height);//重置当前视口glMatrixMode(GL_PROJECTION);glLoadIdentity();//设置视口的大小,设置透视投影矩阵gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f);//y轴倾斜角，宽高比，z轴近距>0,z轴远距》近距》0glMatrixMode(GL_MODELVIEW);glLoadIdentity();//重置模型视图矩阵}int InitGL(GLvoid)//开始对GL进行所有设置{if (!LoadGLTextures()){return FALSE;}glEnable(GL_TEXTURE_2D);//启用纹理映射glShadeModel(GL_SMOOTH);glClearColor(0.0f,0.0f,0.0f,0.5f);glClearDepth(1.0f);//设置深度缓存glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);//最好的透视修正glBlendFunc(GL_SRC_ALPHA,GL_ONE);// 基于源象素alpha通道值的半透明混合函数glEnable(GL_BLEND);//启用混色for (loop=0; loop <num; loop++){star[loop].angle=0.0f;star[loop].dist=(float(loop)/num)*5.0f;star[loop].r=rand()%256;star[loop].g=rand()%256;star[loop].b=rand()%256;}return TRUE;}//绘图工作int DrawGLScene(GLvoid){glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);glBindTexture(GL_TEXTURE_2D,texture[0]);//选择纹理for(loop=0;loop<num;loop++){glLoadIdentity();glTranslatef(0.0f,0.0f,zoom);//深入屏幕里面glRotatef(tilt,1.0f,0.0f,0.0f);//倾斜视角glRotatef(star[loop].angle,0.0f,1.0f,0.0f);//旋转至当前所画星星的角度glTranslatef(star[loop].dist,0.0f,0.0f);//沿x轴正向移动glRotatef(-star[loop].angle,0.0f,1.0f,0.0f);//取消当前星星角度glRotatef(-tilt,1.0f,0.0f,0.0f);//取消屏幕倾斜if (twinkle){//使用GLubyte数值指定一个颜色glColor4ub(star[(num-loop)-1].r,star[(num-loop)-1].g,star[(num-loop)-1].b,255);glBegin(GL_QUADS);//开始绘制纹理映射过的四边形glTexCoord2f(0.0f,0.0f); glVertex3f(-1.0f,-1.0f,0.0f);glTexCoord2f(1.0f,0.0f); glVertex3f(1.0f,-1.0f,0.0f);glTexCoord2f(1.0f,1.0f); glVertex3f(1.0f,1.0f,0.0f);glTexCoord2f(0.0f,1.0f); glVertex3f(-1.0f,1.0f,0.0f);glEnd();}//绘制第二遍星星glRotatef(spin,0.0f,0.0f,1.0f);//绕z轴旋转星星glColor4ub(star[loop].r,star[loop].g,star[loop].b,255);glBegin(GL_QUADS);glTexCoord2f(0.0f,0.0f); glVertex3f(-1.0f,-1.0f,0.0f);glTexCoord2f(1.0f,0.0f); glVertex3f(1.0f,-1.0f,0.0f);glTexCoord2f(1.0f,1.0f); glVertex3f(1.0f,1.0f,0.0f);glTexCoord2f(0.0f,1.0f); glVertex3f(-1.0f,1.0f,0.0f);glEnd();spin+=0.01f;//星星的公转star[loop].angle+=float(loop)/num;//改变星星的自转角度star[loop].dist-=0.01f;//改变星星离中心的距离//检查星星是否已经碰到了屏幕中心。当星星碰到屏幕中心时，我们为它赋一个新颜色，//然后往外移5个单位，这颗星星将踏上它回归屏幕中心的旅程。if (star[loop].dist<0.0f)//星星到达中心？{star[loop].dist+=5.0;star[loop].r=rand()%256;star[loop].g=rand()%256;star[loop].b=rand()%256;}}    return TRUE;}//程序退出之前调用 依次释放着色描述表RC，设备描述表DC和窗口句柄GLvoid KillGLWindow(GLvoid){if (fullscreen){ChangeDisplaySettings(NULL,0);  //Windows API 把缺省显示设备的设置改变为由第一个参数设定的图形模式ShowCursor(TRUE);//Window32API 显示鼠标}if (hRC)//是否拥有渲染描述表{if (!wglMakeCurrent(NULL,NULL)){ MessageBox(NULL,"释放DC或RC失败","Shutdown Error",MB_OK|MB_ICONINFORMATION);}if (!wglDeleteContext(hRC)){MessageBox(NULL,"释放RC失败","Shutdown Error",MB_OK|MB_ICONINFORMATION);}hRC=NULL;//将hRC设为NULL}if (hDC&&!ReleaseDC(hWND,hDC)){MessageBox(NULL,"不能释放DC失败","Shutdown Error",MB_OK|MB_ICONINFORMATION);hDC=NULL;}if (hWND&&!DestroyWindow(hWND)){MessageBox(NULL,"释放窗口句柄失败","Shutdown Error",MB_OK|MB_ICONINFORMATION);hWND=NULL;}if (!UnregisterClass("OpenGL",hInstance)){MessageBox(NULL,"不能注销窗口类","Shutdown Error",MB_OK|MB_ICONINFORMATION);hInstance=NULL;}}BOOL CreateGLWindow(char* title,int width,int height,int bits,bool fullscreenflag){GLuint PixelFormat;    //窗口类结构WNDCLASS wc;DWORD dwStyle;//窗口风格DWORD dwExStyle;//扩展窗口风格RECT WindowRect;WindowRect.left=(long)0;WindowRect.right=(long)width;WindowRect.top=(long)0;WindowRect.bottom=(long)height;fullscreen=fullscreenflag;hInstance=GetModuleHandle(NULL);//获取一个应用程序或动态链接库的模块句柄 ,NULL返回自身应用程序句柄wc.style=CS_VREDRAW|CS_HREDRAW|CS_OWNDC;//移动时重画，并为窗口取得DCwc.lpfnWndProc=(WNDPROC)WndProc;//WndProc处理消息wc.cbClsExtra= 0;// 无额外窗口数据wc.cbWndExtra= 0;// 无额外窗口数据wc.hInstance=hInstance;//设置实例wc.hIcon=LoadIcon(NULL,IDI_WINLOGO);//装入缺省图标wc.hCursor=LoadCursor(NULL,IDC_ARROW);//装入鼠标指针wc.hbrBackground=NULL;//GL不需要背景wc.lpszMenuName=NULL;//不需要菜单wc.lpszClassName="OpenGL";//设定类名字//注册窗口类if (!RegisterClass(&wc)){MessageBox(NULL,"注册窗口失败"," Error",MB_OK|MB_ICONEXCLAMATION);//EXCLAMATION感叹号return FALSE;}if (fullscreen)//全屏模式{DEVMODE dmScreenSettings;//设备模式memset(&dmScreenSettings,0,sizeof(dmScreenSettings));//确保内存清空为0dmScreenSettings.dmSize=sizeof(dmScreenSettings);//DEVMODE结构的大小dmScreenSettings.dmPelsWidth=width;dmScreenSettings.dmPelsHeight=height;//所选屏幕高度dmScreenSettings.dmBitsPerPel=bits;//每像素颜色数dmScreenSettings.dmFields=DM_BITSPERPEL|DM_PELSHEIGHT|DM_PELSWIDTH;if (ChangeDisplaySettings(&dmScreenSettings,CDS_FULLSCREEN)!=DISP_CHANGE_SUCCESSFUL){// 若模式失败，提供两个选项：退出或在窗口内运行。if (MessageBox(NULL,"全屏模式在当前显示卡上设置失败！\n使用窗口模式","Nehe GL",MB_YESNO|MB_ICONEXCLAMATION)==IDYES){fullscreen=false;}else//用户选择退出{MessageBox(NULL,"程序将被关闭","Error",MB_OK|MB_ICONSTOP);return FALSE;}}}if (fullscreen){dwExStyle=WS_EX_APPWINDOW;dwStyle=WS_POPUP;ShowCursor(FALSE);//隐藏鼠标指针}else//不是全屏{dwExStyle=WS_EX_APPWINDOW|WS_EX_WINDOWEDGE;dwStyle=WS_OVERLAPPEDWINDOW;}AdjustWindowRectEx(&WindowRect,dwStyle,FALSE,dwExStyle);//Windows API真正适合窗口if (!(hWND=CreateWindowEx(dwExStyle,"OpenGL",title,WS_CLIPSIBLINGS|WS_CLIPCHILDREN|dwStyle,//必须的窗体风格属性0,0,WindowRect.right-WindowRect.left,WindowRect.bottom-WindowRect.top,//计算调整好的窗口高度NULL,//无父窗口NULL,//无子菜单hInstance,NULL)))//不向WM_CREATE传递消息{KillGLWindow();MessageBox(NULL,"不能创建窗口","Error",MB_OK|MB_ICONEXCLAMATION);return FALSE;}staticPIXELFORMATDESCRIPTOR pfd=// /pfd 告诉窗口我们所希望的东东，即窗口使用的像素格式{sizeof(PIXELFORMATDESCRIPTOR),// 上述格式描述符的大小1,// 版本号PFD_DRAW_TO_WINDOW |// 格式支持窗口PFD_SUPPORT_OPENGL |// 格式必须支持OpenGLPFD_DOUBLEBUFFER,// 必须支持双缓冲PFD_TYPE_RGBA,// 申请 RGBA 格式bits,// 选定色彩深度0, 0, 0, 0, 0, 0,// 忽略的色彩位0,// 无Alpha缓存0,// 忽略Shift Bit0,// 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,// Reserved0, 0, 0// 忽略层遮罩};if (!(hDC=GetDC(hWND))){KillGLWindow();// 重置显示区MessageBox(NULL,"不能创建一种相匹配的像素格式","错误",MB_OK|MB_ICONEXCLAMATION);return FALSE;}if (!(PixelFormat=ChoosePixelFormat(hDC,&pfd))){KillGLWindow();MessageBox(NULL,"不能创建像素格式","错误",MB_OK|MB_ICONEXCLAMATION);return FALSE;}if(!SetPixelFormat(hDC,PixelFormat,&pfd))// 能够设置象素格式么?{KillGLWindow();// 重置显示区MessageBox(NULL,"不能设置像素格式","错误",MB_OK|MB_ICONEXCLAMATION);return FALSE;// 返回 FALSE}if (!(hRC=wglCreateContext(hDC))){KillGLWindow();// 重置显示区MessageBox(NULL,"不能创建OpenGL渲染描述表","错误",MB_OK|MB_ICONEXCLAMATION);return FALSE;}if (!wglMakeCurrent(hDC,hRC)){KillGLWindow();// 重置显示区MessageBox(NULL,"不能激活当前的OpenGL渲然描述表","错误",MB_OK|MB_ICONEXCLAMATION);return FALSE;}ShowWindow(hWND,SW_SHOW);SetForegroundWindow(hWND);//提高优先级SetFocus(hWND);//设置焦点ReSizeGLScene(width,height);if (!InitGL())// 初始化新建的GL窗口{KillGLWindow();// 重置显示区MessageBox(NULL,"Initialization Failed.","ERROR",MB_OK|MB_ICONEXCLAMATION);return FALSE;// 返回 FALSE}return TRUE;}LRESULT CALLBACK WndProc(HWNDhWnd,// 窗口的句柄UINTuMsg,// 窗口的消息WPARAMwParam,// 附加的消息内容LPARAMlParam)// 附加的消息内容{        switch (uMsg)// 检查Windows消息{case WM_ACTIVATE:// 监视窗口激活消息{if (!HIWORD(wParam))// 检查最小化状态{active=TRUE;// 程序处于激活状态}else{active=FALSE;// 程序不再激活}return 0;// 返回消息循环}case WM_SYSCOMMAND:// 系统中断命令{switch (wParam)// 检查系统调用{case SC_SCREENSAVE:// 屏保要运行?case SC_MONITORPOWER:// 显示器要进入节电模式?return 0;// 阻止发生}break;// 退出}   case WM_CLOSE:// 收到Close消息?{PostQuitMessage(0);// 发出退出消息return 0;// 返回}  case WM_KEYDOWN:// 有键按下么?{keys[wParam] = TRUE;// 如果是，设为TRUEreturn 0;// 返回}   case WM_KEYUP:// 有键放开么?{keys[wParam] = FALSE;// 如果是，设为FALSEreturn 0;// 返回}case WM_SIZE:// 调整OpenGL窗口大小{ReSizeGLScene(LOWORD(lParam),HIWORD(lParam));// LoWord=Width,HiWord=Heightreturn 0;// 返回}}return DefWindowProc(hWnd,uMsg,wParam,lParam);}   int WINAPI WinMain(HINSTANCEhInstance,// 当前窗口实例HINSTANCEhPrevInstance,// 前一个窗口实例LPSTRlpCmdLine,// 命令行参数intnCmdShow)// 窗口显示状态{  MSGmsg;// Windowsx消息结构BOOLdone=FALSE;// 用来退出循环的Bool 变量if (MessageBox(NULL,"你想在全屏模式下运行么？", "设置全屏模式",MB_YESNO|MB_ICONQUESTION)==IDNO){fullscreen=FALSE;// FALSE为窗口模式}if (!CreateGLWindow("NeHe's 透明纹理实例",640,480,16,fullscreen)){return 0;// 失败退出}  while(!done)// 保持循环直到 done=TRUE{if (PeekMessage(&msg,NULL,0,0,PM_REMOVE))// 有消息在等待吗?{if (msg.message==WM_QUIT)// 收到退出消息?{done=TRUE;// 是，则done=TRUE}else// 不是，处理窗口消息{TranslateMessage(&msg);// 翻译消息DispatchMessage(&msg);// 发送消息}}else// 如果没有消息{if (active)// 程序激活的么?{if (keys[VK_ESCAPE])// ESC 按下了么?{done=TRUE;// ESC 发出退出信号}else// 不是退出的时候，刷新屏幕{ DrawGLScene();// 绘制场景SwapBuffers(hDC);// 交换缓存 (双缓存)//键盘监视代码if (keys['T']&&!tp){tp=TRUE;twinkle=!twinkle;}if (!keys['T']){tp=FALSE;}}if (keys[VK_PRIOR])//Pageup{zoom-=0.02f;//木箱移向屏幕内}if (keys[VK_NEXT]){zoom+=0.02f;}if (keys[VK_UP]){tilt-=0.5f;}if(keys[VK_DOWN]){tilt+=0.5f;}}if (keys[VK_F1])// F1键按下了么?{keys[VK_F1]=FALSE;// 若是，使对应的Key数组中的值为 FALSEKillGLWindow();// 销毁当前的窗口fullscreen=!fullscreen;// 切换 全屏 / 窗口 模式// 重建 OpenGL 窗口if (!CreateGLWindow("NeHe's 透明纹理实例",640,480,16,fullscreen)){return 0;// 如果窗口未能创建，程序退出}}}}KillGLWindow();// 销毁窗口return (msg.wParam);// 退出程序}