标准实验报告-模板

电子科技大学实验报告学生姓名：学号：指导教师：实验地点：实验时间：一、实验室名称：计算机学院软件实验室二、实验项目名称：三维特效技术三、实验学时：8学时四、实验原理很多的现象都可以用粒子系统精确的或者近似的模拟，如火焰、喷泉、爆炸、鱼群和星空等等。一个粒子系统由拥有各种属性的对象组成，它们必须遵循一定的行为规范。具体的这些属性和行为规范取决于需要模拟的内容是什么。一些粒子系统可能需要很多属性和复杂的规则，而有的则可能极为简单。根据粒子设置的复杂性，可以产生：简单的可以实现喷泉、烟雾、火焰等；复杂一点的可以实现flocking等；再复杂一点就可以利用粒子系统模拟实现衣物等弹性物体。粒子系统是一种物理模型，粒子系统的核心不在于如何显示图形，而是在于对某个物理模型的理解和分析。只有基于物理模型的方法，才能模拟出随机而逼真的自然景象。粒子的运动（变化）规律可以很简单也可以很复杂，这取决于模拟的物理模型的复杂程度。对于每一个粒子，它应具有以下属性：(1)坐标(Coordinates) ：对于每一个粒子，最终都要把它映射到屏幕上，所以坐标成为一个粒子最为重要的属性之一。每个粒子的坐标随时间的变化而变化，它通过每个粒子自身在各时刻的速度求得。(2)速度(Velocity)：运动的粒子都有速度，每个粒子的速度可以各不相同。速度用来计算下一时刻粒子的坐标（位置）。(3)加速度(Acceleration)： 粒子可以做变速运动，此时加速度便会发生作用。它用来计算下一时刻粒子的速度。(4)生命值(Life)：每个粒子都有着自己的生命值，随着时间的推移，粒子的生命值不断减小，直到粒子死亡（生命值为0）。一个生命周期结束时，另一个生命周期随即开始，有时为了使粒子能够源源不断地涌出，必须使一部分粒子在初始后立即死亡，这个技巧在后面的实现中会具体说明。(5)衰减(Decay)：就象人会衰老一样，每个粒子也有它自己的生命周期，Decay就是用来控制粒子生命周期的一个物理量。五、实验目的本实验要实现一个基本的粒子系统，该基本粒子系统必须具有以下模块：粒子生成、给粒子施加力（例如：重力、拖力等）、粒子的碰撞效果（例如与其他几何体碰撞，并反弹回来）。基本系统实现之后，学生可以选择一些针对粒子绘制和物理仿真方面的扩展。针对绘制的扩展可以产生如：烟雾、火光、火花等特效。针对物理方面的扩展可以产生如：衣物、绳子、甚至鸟群、鱼群等。六、实验内容利用OpenGL实现一个标准的粒子系统特效，如：烟花、喷泉等。七、实验器材（设备、元器件）操作系统：WindowsXP开发工具：VC2003，OpenGLl库普通PC即可八、实验步骤创建工程启动VC++2003，创建空白工程项目。选择菜单中的“文件”->“新建”->“项目”，在弹出的对话框中，左边的“项目类型”框中，选择“VisualC++项目”，在右边框中，选择“空项目(.Net)”，在对话框下边，选择工程文件存放目录及输入名称，如Example1，单击“确定”。设置此工程所需的OpenGL库选择菜单中的“项目”->“Example1属性”，在弹出的“Example1属性页”对话框中，单击“链接器”->“输入”，选择右边框中的“附加依赖项”，单击最右端的“…”小按钮，弹出“附加依赖项”对话框，输入“opengl32.lib

glu32.lib

glaux.lib”（注意，输入双引号中的内容，各个库用空格分开；否则会出现链接错误），单击“确定”结束，返回“属性页”对话框，单击“确定”。OpenGL库设置完成。在工程项目中添加源文件在解决方案资源管理器中，鼠标右击“源文件”，弹出浮动菜单，选择“添加”->“添加新项”，弹出“添加新项-Example1”对话框，在右边的模板框中，选择“C++文件(.cpp)”，输入文件名，单击“打开”，添加源文件结束。如果需要添加头文件，其操作方法相似。本例没有编写的头文件。录入源程序将预习时编写的源程序录入到计算机中。本例的源代码来自OpenGL的编程教程，仅作为本实验的参考代码。学生可以自己编写粒子系统，也以此为基础，修改源代码生成不同的粒子系统。说明：准备好粒子显示图片，取名为Particle.bmp，并放在当前目录的子目录data下。该图片将作为粒子的纹理，如图1所示。图1粒子纹理图片图1粒子纹理图片九、实验数据及结果分析程序执行后，看到粒子爆炸、散开，然后粒子不断往往下坠落。如图2所示。通过修改粒子速度、加速度、生命期等参数，可以看到粒子效果的差别。图2粒子特效截图图2粒子特效截图十、实验结论利用OpenGL能够实现粒子系统特效，如：喷泉、烟雾等。十一、总结及心得体会OpenGL具有强大的图形绘制功能，能很好地支持图形设计。十二、对本实验过程及方法、手段的改进建议程序设计合理，代码可进一步优化。报告评分：指导教师签字：本实验参考源代码如下：/** ThisCodeWasCreatedByJeffMolofee2000* IfYou'veFoundThisCodeUseful,PleaseLetMeKnow.* VisitMySiteAt*/#include<windows.h> //HeaderFileForWindows#include<stdio.h> //HeaderFileForStandardInput/Output#include<gl\gl.h> //HeaderFileForTheOpenGL32Library#include<gl\glu.h> //HeaderFileForTheGLu32Library#include<gl\glaux.h> //HeaderFileForTheGlauxLibrary#define MAX_PARTICLES 1000 //NumberOfParticlesToCreateHDC hDC=NULL; //PrivateGDIDeviceContextHGLRC hRC=NULL; //PermanentRenderingContextHWND hWnd=NULL; //HoldsOurWindowHandleHINSTANCE hInstance; //HoldsTheInstanceOfTheApplicationbool keys[256]; //ArrayUsedForTheKeyboardRoutinebool active=TRUE; //WindowActiveFlagSetToTRUEByDefaultbool fullscreen=TRUE; //FullscreenFlagSetToFullscreenModeByDefaultbool rainbow=true; //RainbowMode?bool sp; //SpacebarPressed?bool rp; //EnterKeyPressed?float slowdown=2.0f; //SlowDownParticlesfloat xspeed; //BaseXSpeed(ToAllowKeyboardDirectionOfTail)float yspeed; //BaseYSpeed(ToAllowKeyboardDirectionOfTail)float zoom=-40.0f; //UsedToZoomOutGLuint loop; //MiscLoopVariableGLuint col; //CurrentColorSelectionGLuint delay; //RainbowEffectDelayGLuint texture[1]; //StorageForOurParticleTexturetypedefstruct //CreateAStructureForParticle{ bool active; //Active(Yes/No) float life; //ParticleLife float fade; //FadeSpeed float r; //RedValue float g; //GreenValue float b; //BlueValue float x; //XPosition float y; //YPosition float z; //ZPosition float xi; //XDirection float yi; //YDirection float zi; //ZDirection float xg; //XGravity float yg; //YGravity float zg; //ZGravity}particles; //ParticlesStructureparticlesparticle[MAX_PARTICLES]; //ParticleArray(RoomForParticleInfo)staticGLfloatcolors[12][3]= //RainbowOfColors{ {1.0f,0.5f,0.5f},{1.0f,0.75f,0.5f},{1.0f,1.0f,0.5f},{0.75f,1.0f,0.5f}, {0.5f,1.0f,0.5f},{0.5f,1.0f,0.75f},{0.5f,1.0f,1.0f},{0.5f,0.75f,1.0f}, {0.5f,0.5f,1.0f},{0.75f,0.5f,1.0f},{1.0f,0.5f,1.0f},{1.0f,0.5f,0.75f}};//DeclarationForWndProcLRESULT CALLBACKWndProc(HWND,UINT,WPARAM,LPARAM); AUX_RGBImageRec*LoadBMP(char*Filename) //LoadsABitmapImage{FILE*File=NULL; //FileHandleif(!Filename) //MakeSureAFilenameWasGiven{returnNULL; //IfNotReturnNULL}File=fopen(Filename,"r"); //CheckToSeeIfTheFileExistsif(File) //DoesTheFileExist?{ fclose(File); //CloseTheHandle returnauxDIBImageLoad(Filename); //LoadTheBitmapAndReturnAPointer}returnNULL; //IfLoadFailedReturnNULL}intLoadGLTextures() //LoadBitmapAndConvertToATexture{intStatus=FALSE; //StatusIndicatorAUX_RGBImageRec*TextureImage[1]; //CreateStorageSpaceForTheTexturesmemset(TextureImage,0,sizeof(void*)*1); //SetThePointerToNULLif(TextureImage[0]=LoadBMP("Data/Particle.bmp")) //LoadParticleTexture{ Status=TRUE; //SetTheStatusToTRUE glGenTextures(1,&texture[0]); //CreateOneTexture 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]) //IfTextureExists { if(TextureImage[0]->data) //IfTextureImageExists { free(TextureImage[0]->data); //FreeTheTextureImageMemory } free(TextureImage[0]); //FreeTheImageStructure }returnStatus; //ReturnTheStatus}//ResizeAndInitializeTheGLWindowGLvoidReSizeGLScene(GLsizeiwidth,GLsizeiheight){ if(height==0) //PreventADivideByZeroBy { height=1; //MakingHeightEqualOne } glViewport(0,0,width,height); //ResetTheCurrentViewport glMatrixMode(GL_PROJECTION); //SelectTheProjectionMatrix glLoadIdentity(); //ResetTheProjectionMatrix //CalculateTheAspectRatioOfTheWindow gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,200.0f); glMatrixMode(GL_MODELVIEW); //SelectTheModelviewMatrix glLoadIdentity(); //ResetTheModelviewMatrix}intInitGL(GLvoid) //AllSetupForOpenGLGoesHere{ if(!LoadGLTextures()) //JumpToTextureLoadingRoutine { returnFALSE; //IfTextureDidn'tLoadReturnFALSE } glShadeModel(GL_SMOOTH); //EnableSmoothShading glClearColor(0.0f,0.0f,0.0f,0.0f); //BlackBackground glClearDepth(1.0f); //DepthBufferSetup glDisable(GL_DEPTH_TEST); //DisableDepthTesting glEnable(GL_BLEND); //EnableBlending glBlendFunc(GL_SRC_ALPHA,GL_ONE); //TypeOfBlendingToPerform//ReallyNicePerspectiveCalculations glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST); glHint(GL_POINT_SMOOTH_HINT,GL_NICEST); //ReallyNicePointSmoothing glEnable(GL_TEXTURE_2D); //EnableTextureMapping glBindTexture(GL_TEXTURE_2D,texture[0]); //SelectOurTexture for(loop=0;loop<MAX_PARTICLES;loop++) //InitialsAllTheTextures { particle[loop].active=true; //MakeAllTheParticlesActive particle[loop].life=1.0f; //GiveAllTheParticlesFullLife particle[loop].fade=float(rand()%100)/1000.0f+0.003f; //RandomFadeSpeed particle[loop].r=colors[loop*(12/MAX_PARTICLES)][0]; //SelectRedRainbowColor particle[loop].g=colors[loop*(12/MAX_PARTICLES)][1]; //SelectRedRainbowColor particle[loop].b=colors[loop*(12/MAX_PARTICLES)][2]; //SelectRedRainbowColor particle[loop].xi=float((rand()%50)-26.0f)*10.0f; //RandomSpeedOnXAxis particle[loop].yi=float((rand()%50)-25.0f)*10.0f; //RandomSpeedOnYAxis particle[loop].zi=float((rand()%50)-25.0f)*10.0f; //RandomSpeedOnZAxis particle[loop].xg=0.0f; //SetHorizontalPullToZero particle[loop].yg=-0.8f; //SetVerticalPullDownward particle[loop].zg=0.0f; //SetPullOnZAxisToZero } returnTRUE; //InitializationWentOK}intDrawGLScene(GLvoid) //Here'sWhereWeDoAllTheDrawing{ //ClearScreenAndDepthBuffer glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); glLoadIdentity(); //ResetTheModelViewMatrix for(loop=0;loop<MAX_PARTICLES;loop++) //LoopThroughAllTheParticles { if(particle[loop].active) //IfTheParticleIsActive { floatx=particle[loop].x; //GrabOurParticleXPosition floaty=particle[loop].y; //GrabOurParticleYPosition floatz=particle[loop].z+zoom; //ParticleZPos+Zoom //DrawTheParticleUsingOurRGBValues,FadeTheParticleBasedOnIt'sLife glColor4f(particle[loop].r,particle[loop].g,particle[loop].b,particle[loop].life); glBegin(GL_TRIANGLE_STRIP); //BuildQuadFromATriangleStrip glTexCoord2d(1,1);glVertex3f(x+0.5f,y+0.5f,z);//TopRight glTexCoord2d(0,1);glVertex3f(x-0.5f,y+0.5f,z);//TopLeft glTexCoord2d(1,0);glVertex3f(x+0.5f,y-0.5f,z);//BottomRight glTexCoord2d(0,0);glVertex3f(x-0.5f,y-0.5f,z);//BottomLeft glEnd(); //DoneBuildingTriangleStrip//MoveOnTheXAxisByXSpeed particle[loop].x+=particle[loop].xi/(slowdown*1000);//MoveOnTheYAxisByYSpeed particle[loop].y+=particle[loop].yi/(slowdown*1000);//MoveOnTheZAxisByZSpeed particle[loop].z+=particle[loop].zi/(slowdown*1000); particle[loop].xi+=particle[loop].xg; //TakePullOnXAxisIntoAccount particle[loop].yi+=particle[loop].yg; //TakePullOnYAxisIntoAccount particle[loop].zi+=particle[loop].zg; //TakePullOnZAxisIntoAccount particle[loop].life-=particle[loop].fade; //ReduceParticlesLifeBy'Fade' if(particle[loop].life<0.0f) //IfParticleIsBurnedOut { particle[loop].life=1.0f; //GiveItNewLife //RandomFadeValue particle[loop].fade=float(rand()%100)/1000.0f+0.003f; particle[loop].x=0.0f; //CenterOnXAxis particle[loop].y=0.0f; //CenterOnYAxis particle[loop].z=0.0f; //CenterOnZAxis //XAxisSpeedAndDirection particle[loop].xi=xspeed+float((rand()%60)-32.0f); //YAxisSpeedAndDirection particle[loop].yi=yspeed+float((rand()%60)-30.0f); particle[loop].zi=float((rand()%60)-30.0f); //ZAxisSpeedAndDirection particle[loop].r=colors[col][0]; //SelectRedFromColorTable particle[loop].g=colors[col][1]; //SelectGreenFromColorTable particle[loop].b=colors[col][2]; //SelectBlueFromColorTable } //IfNumberPad8AndYGravityIsLessThan1.5IncreasePullUpwards if(keys[VK_NUMPAD8]&&(particle[loop].yg<1.5f))particle[loop].yg+=0.01f; //IfNumberPad2AndYGravityIsGreaterThan-1.5IncreasePullDownwards if(keys[VK_NUMPAD2]&&(particle[loop].yg>-1.5f))particle[loop].yg-=0.01f; //IfNumberPad6AndXGravityIsLessThan1.5IncreasePullRight if(keys[VK_NUMPAD6]&&(particle[loop].xg<1.5f))particle[loop].xg+=0.01f; //IfNumberPad4AndXGravityIsGreaterThan-1.5IncreasePullLeft if(keys[VK_NUMPAD4]&&(particle[loop].xg>-1.5f))particle[loop].xg-=0.01f; if(keys[VK_TAB]) //TabKeyCausesABurst { particle[loop].x=0.0f; //CenterOnXAxis particle[loop].y=0.0f; //CenterOnYAxis particle[loop].z=0.0f; //CenterOnZAxis particle[loop].xi=float((rand()%50)-26.0f)*10.0f; //RandomSpeedOnXAxis particle[loop].yi=float((rand()%50)-25.0f)*10.0f; //RandomSpeedOnYAxis particle[loop].zi=float((rand()%50)-25.0f)*10.0f; //RandomSpeedOnZAxis } }} returnTRUE; //EverythingWentOK}GLvoidKillGLWindow(GLvoid) //ProperlyKillTheWindow{ if(fullscreen) //AreWeInFullscreenMode? { ChangeDisplaySettings(NULL,0); //IfSoSwitchBackToTheDesktop ShowCursor(TRUE); //ShowMousePointer } if(hRC) //DoWeHaveARenderingContext? { //AreWeAbleToReleaseTheDCAndRCContexts? if(!wglMakeCurrent(NULL,NULL)) { MessageBox(NULL,"ReleaseOfDCAndRCFailed.","SHUTDOWNERROR",MB_OK|MB_ICONINFORMATION); } if(!wglDeleteContext(hRC)) //AreWeAbleToDeleteTheRC? { MessageBox(NULL,"ReleaseRenderingContextFailed.","SHUTDOWNERROR",MB_OK|MB_ICONINFORMATION); } hRC=NULL; //SetRCToNULL } if(hDC&&!ReleaseDC(hWnd,hDC)) //AreWeAbleToReleaseTheDC { MessageBox(NULL,"ReleaseDeviceContextFailed.","SHUTDOWNERROR",MB_OK|MB_ICONINFORMATION); hDC=NULL; //SetDCToNULL } if(hWnd&&!DestroyWindow(hWnd)) //AreWeAbleToDestroyTheWindow? { MessageBox(NULL,"CouldNotReleasehWnd.","SHUTDOWNERROR",MB_OK|MB_ICONINFORMATION); hWnd=NULL; //SethWndToNULL } if(!UnregisterClass("OpenGL",hInstance)) //AreWeAbleToUnregisterClass { MessageBox(NULL,"CouldNotUnregisterClass.","SHUTDOWNERROR",MB_OK|MB_ICONINFORMATION); hInstance=NULL; //SethInstanceToNULL }}/* ThisCodeCreatesOurOpenGLWindow.ParametersAre: ** title -TitleToAppearAtTheTopOfTheWindow ** width -WidthOfTheGLWindowOrFullscreenMode ** height -HeightOfTheGLWindowOrFullscreenMode ** bits -NumberOfBitsToUseForColor(8/16/24/32) ** fullscreenflag -UseFullscreenMode(TRUE)OrWindowedMode(FALSE) */BOOLCreateGLWindow(char*title,intwidth,intheight,intbits,boolfullscreenflag){ GLuint PixelFormat; //HoldsTheResultsAfterSearchingForAMatch WNDCLASS wc; //WindowsClassStructure DWORD dwExStyle; //WindowExtendedStyle DWORD dwStyle; //WindowStyle RECT WindowRect; //GrabsRectangleUpperLeft/LowerRightValues WindowRect.left=(long)0; //SetLeftValueTo0 WindowRect.right=(long)width; //SetRightValueToRequestedWidth WindowRect.top=(long)0; //SetTopValueTo0 WindowRect.bottom=(long)height; //SetBottomValueToRequestedHeight fullscreen=fullscreenflag; //SetTheGlobalFullscreenFlag hInstance =GetModuleHandle(NULL); //GrabAnInstanceForOurWindow//RedrawOnSize,AndOwnDCForWindow. wc.style =CS_HREDRAW|CS_VREDRAW|CS_OWNDC; wc.lpfnWndProc =(WNDPROC)WndProc; //WndProcHandlesMessages wc.cbClsExtra =0; //NoExtraWindowData wc.cbWndExtra =0; //NoExtraWindowData wc.hInstance =hInstance; //SetTheInstance wc.hIcon =LoadIcon(NULL,IDI_WINLOGO); //LoadTheDefaultIcon wc.hCursor =LoadCursor(NULL,IDC_ARROW); //LoadTheArrowPointer//NoBackgroundRequiredForGL wc.hbrBackground =NULL; wc.lpszMenuName =NULL; //WeDon'tWantAMenu wc.lpszClassName ="OpenGL"; //SetTheClassName if(!RegisterClass(&wc)) //AttemptToRegisterTheWindowClass { MessageBox(NULL,"FailedToRegisterTheWindowClass.","ERROR",MB_OK|MB_ICONEXCLAMATION); returnFALSE; //ReturnFALSE } if(fullscreen) //AttemptFullscreenMode? { DEVMODEdmScreenSettings; //DeviceMode//MakesSureMemory'sCleared memset(&dmScreenSettings,0,sizeof(dmScreenSettings)); //SizeOfTheDevmodeStructure dmScreenSettings.dmSize=sizeof(dmScreenSettings); dmScreenSettings.dmPelsWidth =width; //SelectedScreenWidth dmScreenSettings.dmPelsHeight =height; //SelectedScreenHeight dmScreenSettings.dmBitsPerPel =bits; //SelectedBitsPerPixel dmScreenSettings.dmFields=DM_BITSPERPEL|DM_PELSWIDTH|DM_PELSHEIGHT;//TryToSetSelectedModeAndGetResults.//NOTE:CDS_FULLSCREENGetsRidOfStartBar. if(ChangeDisplaySettings(&dmScreenSettings,CDS_FULLSCREEN)!=DISP_CHANGE_SUCCESSFUL) { //IfTheModeFails,OfferTwoOptions.QuitOrUseWindowedMode. if(MessageBox(NULL,"TheRequestedFullscreenModeIsNotSupportedBy\nYourVideoCard.UseWindowedModeInstead?","NeHeGL",MB_YESNO|MB_ICONEXCLAMATION)==IDYES) { fullscreen=FALSE; //WindowedModeSelected.Fullscreen=FALSE } else { //PopUpAMessageBoxLettingUserKnowTheProgramIsClosing. MessageBox(NULL,"ProgramWillNowClose.","ERROR",MB_OK|MB_ICONSTOP); returnFALSE; //ReturnFALSE } } } if(fullscreen) //AreWeStillInFullscreenMode? { dwExStyle=WS_EX_APPWINDOW; //WindowExtendedStyle dwStyle=WS_POPUP; //WindowsStyle ShowCursor(FALSE); //HideMousePointer } else {//WindowExtendedStyle dwExStyle=WS_EX_APPWINDOW|WS_EX_WINDOWEDGE; dwStyle=WS_OVERLAPPEDWINDOW; //WindowsStyle } //AdjustWindowToTrueRequestedSize AdjustWindowRectEx(&WindowRect,dwStyle,FALSE,dwExStyle); //CreateTheWindow if(!(hWnd=CreateWindowEx( dwExStyle, //ExtendedStyleForTheWindow "OpenGL", //ClassName title, //WindowTitle dwStyle| //DefinedWindowStyle WS_CLIPSIBLINGS| //RequiredWindowStyle WS_CLIPCHILDREN, //RequiredWindowStyle 0,0, //WindowPosition//CalculateWindowWidth WindowRect.right-WindowRect.left, //CalculateWindowHeight WindowRect.bottom-WindowRect.top, NULL, //NoParentWindow NULL, //NoMenu hInstance, //Instance NULL))) //DontPassAnythingToWM_CREATE { KillGLWindow(); //ResetTheDisplay MessageBox(NULL,"WindowCreationError.","ERROR",MB_OK|MB_ICONEXCLAMATION); returnFALSE; //ReturnFALSE }//pfdTellsWindowsHowWeWantThingsToBe static PIXELFORMATDESCRIPTORpfd= { sizeof(PIXELFORMATDESCRIPTOR), //SizeOfThisPixelFormatDescriptor 1, //VersionNumber PFD_DRAW_TO_WINDOW| //FormatMustSupportWindow PFD_SUPPORT_OPENGL| //FormatMustSupportOpenGL PFD_DOUBLEBUFFER, //MustSupportDoubleBuffering PFD_TYPE_RGBA, //RequestAnRGBAFormat bits, //SelectOurColorDepth 0,0,0,0,0,0, //ColorBitsIgnored 0, //NoAlphaBuffer 0, //ShiftBitIgnored 0, //NoAccumulationBuffer 0,0,0,0, //AccumulationBitsIgnored 16, //16BitZ-Buffer(DepthBuffer) 0, //NoStencilBuffer 0, //NoAuxiliaryBuffer PFD_MAIN_PLANE, //MainDrawingLayer 0, //Reserved 0,0,0 //LayerMasksIgnored }; if(!(hDC=GetDC(hWnd))) //DidWeGetADeviceContext? { KillGLWindow(); //ResetTheDisplay MessageBox(NULL,"Can'tCreateAGLDeviceContext.","ERROR",MB_OK|MB_ICONEXCLAMATION); returnFALSE; //ReturnFALSE } if(!(PixelFormat=ChoosePixelFormat(hDC,&pfd))) //DidWindowsFindAMatchingPixelFormat? { KillGLWindow(); //ResetTheDisplay MessageBox(NULL,"Can'tFindASuitablePixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION); returnFALSE; //ReturnFALSE } if(!SetPixelFormat(hDC,PixelFormat,&pfd)) //AreWeAbleToSetThePixelFormat? { KillGLWindow(); //ResetTheDisplay MessageBox(NULL,"Can'tSetThePixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION); returnFALSE; //ReturnFALSE } if(!(hRC=wglCreateContext(hDC))) //AreWeAbleToGetARenderingContext? { KillGLWindow(); //ResetTheDisplay MessageBox(NULL,"Can'tCreateAGLRenderingContext.","ERROR",MB_OK|MB_ICONEXCLAMATION); returnFALSE; //ReturnFALSE } if(!wglMakeCurrent(hDC,hRC)) //TryToActivateTheRenderingContext { KillGLWindow(); //ResetTheDisplay MessageBox(NULL,"Can'tActivateTheGLRenderingContext.","ERROR",MB_OK|MB_ICONEXCLAMATION); returnFALSE; //ReturnFALSE } ShowWindow(hWnd,SW_SHOW); //ShowTheWindow SetForegroundWindow(hWnd); //SlightlyHigherPriority SetFocus(hWnd); //SetsKeyboardFocusToTheWindow ReSizeGLScene(width,height); //SetUpOurPerspectiveGLScreen if(!InitGL()) //InitializeOurNewlyCreatedGLWindow { KillGLWindow(); //ResetTheDisplay MessageBox(NULL,"InitializationFailed.","ERROR",MB_OK|MB_ICONEXCLAMATION); returnFALSE; //ReturnFALSE } returnTRUE; //Success}LRESULTCALLBACKWndProc(HWND hWnd, //HandleForThisWindow UINT uMsg, //MessageForThisWindow WPARAMwParam, //AdditionalMessageInformation LPARAMlParam) //AdditionalMessageInformation{ switch(uMsg) //CheckForWindowsMessages { caseWM_ACTIVATE: //WatchForWindowActivateMessage { if(!HIWORD(wParam)) //CheckMinimizationState { active=TRUE; //ProgramIsActive } else //Otherwise { active=FALSE; //ProgramIsNoLongerActive } return0; //ReturnToTheMessageLoop } caseWM_SYSCOMMAND: //InterceptSystemCommands { switch(wParam) //CheckSystemCalls { caseSC_SCREENSAVE: //ScreensaverTryingToStart? caseSC_MONITORPOWER: //MonitorTryingToEnterPowersave? return0; //PreventFromHappening } break; //Exit } caseWM_CLOSE: //DidWeReceiveACloseMessage? { PostQuitMessage(0); //SendAQuitMessage return0; //JumpBack } caseWM_KEYDOWN: //IsAKeyBeingHeldDown? { keys[wParam]=TRUE; //IfSo,MarkItAsTRUE return0; //JumpBack } caseWM_KEYUP: //HasAKeyBeenReleased? { keys[wParam]=FALSE; //IfSo,MarkItAsFALSE return0; //JumpBack } caseWM_SIZE: //ResizeTheOpenGLWindow {//LoWord=Width,HiWord=Height ReSizeGLScene(LOWORD(lParam),HIWORD(lParam)); return0; //JumpBack } } //PassAllUnhandledMessagesToDefWindowProc returnDefWindowProc(hWnd,uMsg,wParam,lParam);}intWINAPIWinMain( HINSTANCE hInstance, //Instance HINSTANCE hPrevInstance, //PreviousInstance LPSTR lpCmdLine, //CommandLineParameters int nCmdShow) //WindowShowState{ MSG msg; //WindowsMessageStructure BOOL done=FALSE; //BoolVariableToExitLoop //AskTheUserWhichScreenModeTheyPrefer if(MessageBox(NULL,"WouldYouLikeToRunInFullscreenMode?","StartFullScreen?",MB_YESNO|MB_ICONQUESTION)==IDNO) { fullscreen=FALSE; //WindowedMode } //CreateOurOpenGLWindow if(!CreateGLWindow("NeHe'sParticleTutorial",640,480,16,fullscreen)) { return0; //QuitIfWindowWasNotCreated } if(fullscreen) //AreWeInFullscreenMode { slowdown=1.0f; //IfSo,SpeedUpTheParticles(3dfxIssue) } while(!done) //LoopThatRunsWhiledone=FALSE { if(PeekMessage(&msg,NULL,0,0,PM_REMOVE)) //IsThereAMessageWaiting? { if(msg.message==WM_QUIT) //HaveWeReceivedAQuitMessage? { done=TRUE; //IfSodone=TRUE } else //IfNot,DealWithWin