計算機圖形學課程設計報告

《計算機圖形學》課程設計系專：班級：姓名：學號：題目：1、畫直線2、貼紋理指導老師：Bresenham算法畫直線目錄一、實驗目的----------------------3二、設計思路----------------------3三、程序代碼----------------------3四、運行結果---------------------19一、實驗目的運用Bresenham算法畫出斜率各不同的直線，包括大于-1小于1、等于1，大于1，小于-1，無窮大。設計思路假定直線的起點、終點分別為：（x1,y1),(x2,y2)，且都為整數(shù)。則直線方程為y=mx+b，其中b=y1-mx1，m=dy/dx,當x每遞增1，y遞增k(即直線斜率)取yi+1，yi由d1，d2的大小決定y=m(xi+1)+b,d1=y-yi，d2=yi+1–y，當d1-d2>0，;當d1-d2<0，;d1-d2=2y-2yi-1=2dy/dx(xi+1)+2b-2yi-1,dx(d1-d2)=2dy(xi+1)+2bdx-2yidx-dx,設pi=dx(d1-d2),則pi=2xidy-2yidx+2dy+2bdx-dx（1）則pi+1=2(xi+1)dy-2yi+1dx+2dy+2bdx-dxpi+1=2dy-2(yi+1-yi)dx+pi；當pi>0時yi+1=yi+1，pi+1=2dy-2dx+pi當pi<0時yi+1=yi，pi+1=2dy+pi初值p1=2x1dy-2y1dx+2dy+2bdx-dx因為y1dx=x1dy+bdx;所以p1=2x1dy-2(x1dy+bdx)+2dy+2bdx-dx=2dy-dx總結：p1=2dy-dxdx=x2-x1，dy=y2-y1當p1>0時p2=p1+2dy-2dx當p1<0時p2=p1+2dy，由此得出算法。程序代碼#include<windows.h> //HeaderFileForWindows#include<gl\gl.h> //HeaderFileForTheOpenGL32Library#include<gl\glu.h> //HeaderFileForTheGLu32Library#include<gl\glaux.h> //HeaderFileForTheGlauxLibrary#include<stdio.h>#include<math.h>HDC hDC=NULL; //PrivateGDIDeviceContextHGLRC hRC=NULL; //PermanentRenderingContextHWND hWnd=NULL; //HoldsOurWindowHandleHINSTANCE hInstance; //HoldsTheInstanceOfTheApplicationbool keys[256]; //ArrayUsedForTheKeyboardRoutinebool active=TRUE; //WindowActiveFlagSetToTRUEByDefaultbool fullscreen=TRUE; //FullscreenFlagSetToFullscreenModeByDefaultboolpt=true;boolfc=true;floatx=0.0,y=0.0;LRESULT CALLBACKWndProc(HWND,UINT,WPARAM,LPARAM); //DeclarationForWndProcGLvoidReSizeGLScene(GLsizeiwidth,GLsizeiheight) //ResizeAndInitializeTheGLWindow{ 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,100.0f); glMatrixMode(GL_MODELVIEW); //SelectTheModelviewMatrix glLoadIdentity(); //ResetTheModelviewMatrix}voidDrawLine(){ intx1=30,y1=-60,x2=0,y2=0;intdx=x2-x1,dy=y2-y1,y=y1,eps=0; floatm=(float)dy/dx; if(m>=0) { if(m<=1) { for(intx=x1;x<=x2;x++) { glBegin(GL_POINTS); glColor3f(1.0f,1.0f,1.0f); glVertex3f((float)x,(float)y,0.0f); glEnd(); if(pt==true) { printf("%d,%d,\n",x,y); } eps+=dy; if((eps<<1)>=dx) { y++; eps-=dx; } } } else { intdx=x2-x1,dy=y2-y1,x=x1,eps=0;for(inty=y1;y<=y2;y++) { glBegin(GL_POINTS); glColor3f(1.0f,1.0f,1.0f); glVertex3f((float)x,(float)y,0.0f); glEnd(); if(pt==true) { printf("%d,%d,\n",x,y); } eps+=dx; if((eps<<1)>=dy) { x++; eps-=dy; } } } } else { if(m>=(-1)) { intdx=x2-x1,dy=y2-y1,y=y1,eps=0;for(intx=x1;x>=x2;x--) { glBegin(GL_POINTS); glColor3f(1.0f,1.0f,1.0f); glVertex3f((float)x,(float)y,0.0f); glEnd(); if(pt==true) { printf("%d,%d,\n",x,y); } eps+=dy; if((eps<<1)>=abs(dx)) { y++; eps-=abs(dx); } } } else { intdx=x2-x1,dy=y2-y1,x=x1,eps=0;for(inty=y1;y<=y2;y++) { glBegin(GL_POINTS); glColor3f(1.0f,1.0f,1.0f); glVertex3f((float)x,(float)y,0.0f); glEnd(); if(pt==true) { printf("%d,%d,\n",x,y); } eps+=dx; if((eps<<1)<=-dy) { x--; eps+=dy; } } } } pt=false;}intInitGL(GLvoid) //AllSetupForOpenGLGoesHere{ glShadeModel(GL_SMOOTH); //EnableSmoothShading glClearColor(0.0f,0.0f,0.0f,0.5f); //BlackBackground glClearDepth(1.0f); //DepthBufferSetup// glEnable(GL_DEPTH_TEST); //EnablesDepthTesting// glDepthFunc(GL_LEQUAL); //TheTypeOfDepthTestingToDo glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST); //ReallyNicePerspectiveCalculations glEnable(GL_POINT_SMOOTH); AllocConsole(); freopen("CONOUT$","w",stdout); returnTRUE; //InitializationWentOK} intDrawGLScene(GLvoid) //Here'sWhereWeDoAllTheDrawing{ glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); //ClearScreenAndDepthBuffer glLoadIdentity();//ResetTheCurrentModelviewMatrix glTranslatef(0.0f,0.0f,-100.0f);DrawLine(); returnTRUE; //EverythingWentOK}GLvoidKillGLWindow(GLvoid) //ProperlyKillTheWindow{ if(fullscreen) //AreWeInFullscreenMode? { ChangeDisplaySettings(NULL,0); //IfSoSwitchBackToTheDesktop ShowCursor(TRUE); //ShowMousePointer } if(hRC) //DoWeHaveARenderingContext? { if(!wglMakeCurrent(NULL,NULL)) //AreWeAbleToReleaseTheDCAndRCContexts? { 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 wc.style =CS_HREDRAW|CS_VREDRAW|CS_OWNDC; //RedrawOnSize,AndOwnDCForWindow. 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 wc.hbrBackground =NULL; //NoBackgroundRequiredForGL 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 memset(&dmScreenSettings,0,sizeof(dmScreenSettings)); //MakesSureMemory'sCleared dmScreenSettings.dmSize=sizeof(dmScreenSettings); //SizeOfTheDevmodeStructure 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 { dwExStyle=WS_EX_APPWINDOW|WS_EX_WINDOWEDGE; //WindowExtendedStyle dwStyle=WS_OVERLAPPEDWINDOW; //WindowsStyle } AdjustWindowRectEx(&WindowRect,dwStyle,FALSE,dwExStyle); //AdjustWindowToTrueRequestedSize //CreateTheWindow if(!(hWnd=CreateWindowEx( dwExStyle, //ExtendedStyleForTheWindow "OpenGL", //ClassName title, //WindowTitle dwStyle| //DefinedWindowStyle WS_CLIPSIBLINGS| //RequiredWindowStyle WS_CLIPCHILDREN, //RequiredWindowStyle 0,0, //WindowPosition WindowRect.right-WindowRect.left, //CalculateWindowWidth WindowRect.bottom-WindowRect.top, //CalculateWindowHeight NULL, //NoParentWindow NULL, //NoMenu hInstance, //Instance NULL))) //DontPassAnythingToWM_CREATE { KillGLWindow(); //ResetTheDisplay MessageBox(NULL,"WindowCreationError.","ERROR",MB_OK|MB_ICONEXCLAMATION); returnFALSE; //ReturnFALSE } static PIXELFORMATDESCRIPTORpfd= //pfdTellsWindowsHowWeWantThingsToBe { 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 WPARAM wParam, //AdditionalMessageInformation LPARAM lParam) //AdditionalMessageInformation{ switch(uMsg) //CheckForWindowsMessages { caseWM_ACTIVATE: //WatchForWindowActivateMessage { if(!HIWORD(wParam)) //CheckMinimizationState { active=TRUE; //ProgramIsActive } else { 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 { ReSizeGLScene(LOWORD(lParam),HIWORD(lParam));//LoWord=Width,HiWord=Height 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("OpenGLFramework",640,480,16,fullscreen)) { return0; //QuitIfWindowWasNotCreated } 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,DealWithWindowMessages { TranslateMessage(&msg); //TranslateTheMessage DispatchMessage(&msg); //DispatchTheMessage } } else //IfThereAreNoMessages { //DrawTheScene.WatchForESCKeyAndQuitMessagesFromDrawGLScene() if(active) //ProgramActive? { if(keys[VK_ESCAPE]) //WasESCPressed? { done=TRUE; //ESCSignalledAQuit } else //NotTimeToQuit,UpdateScreen { DrawGLScene(); //DrawTheScene SwapBuffers(hDC); //SwapBuffers(DoubleBuffering) } } if(keys[VK_F1]) //IsF1BeingPressed? { keys[VK_F1]=FALSE; //IfSoMakeKeyFALSE KillGLWindow(); //KillOurCurrentWindow fullscreen=!fullscreen; //ToggleFullscreen/WindowedMode //RecreateOurOpenGLWindow if(!CreateGLWindow("OpenGLFramework",640,480,16,fullscreen)) { return0; //QuitIfWindowWasNotCreated } } } } //Shutdown KillGLWindow(); //KillTheWindow return(msg.wParam); //ExitTheProgram}運行結果0<m<1:m>10>m>-1m<-1貼紋理目錄一、實驗目的----------------------3二、實驗內容----------------------3三、程序代碼----------------------3四、運行結果---------------------19實驗目的給一個正方體的表面貼上紋理圖案。實驗內容運用opengl圖形軟件包給正方體添上圖案。程序代碼/** ThisCodeWasCreatedByJeffMolofee2000* AHUGEThanksToFredricEcholsForCleaningUp* AndOptimizingTheBaseCode,MakingItMoreFlexible!* 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> //HeaderFileForTheGlauxLibraryHDC hDC=NULL; //PrivateGDIDeviceContextHGLRC hRC=NULL; //PermanentRenderingContextHWND hWnd=NULL; //HoldsOurWindowHandleHINSTANCE hInstance; //HoldsTheInstanceOfTheApplicationbool keys[256]; //ArrayUsedForTheKeyboardRoutinebool active=TRUE; //WindowActiveFlagSetToTRUEByDefaultbool fullscreen=TRUE; //FullscreenFlagSetToFullscreenModeByDefaultGLfloat xrot; //XRotation(NEW)GLfloat yrot; //YRotation(NEW)GLfloat zrot; //ZRotation(NEW)GLuint texture[1]; //StorageForOneTexture(NEW)LRESULT CALLBACKWndProc(HWND,UINT,WPARAM,LPARAM); //DeclarationForWndProcAUX_RGBImageRec*LoadBMP(char*Filename) //LoadsABitmapImage{ FILE*File=NULL; //FileHandle if(!Filename) //MakeSureAFilenameWasGiven { returnNULL; //IfNotReturnNULL } File=fopen(Filename,"r"); //CheckToSeeIfTheFileExists if(File) //DoesTheFileExist? { fclose(File); //CloseTheHandle returnauxDIBImageLoad(Filename); //LoadTheBitmapAndReturnAPointer } returnNULL; //IfLoadFailedReturnNULL}intLoadGLTextures() //LoadBitmapsAndConvertToTextures{ intStatus=FALSE; //StatusIndicator AUX_RGBImageRec*TextureImage[1]; //CreateStorageSpaceForTheTexture memset(TextureImage,0,sizeof(void*)*1); //SetThePointerToNULL //LoadTheBitmap,CheckForErrors,IfBitmap'sNotFoundQuit if(TextureImage[0]=LoadBMP("banma.bmp")) { Status=TRUE; //SetTheStatusToTRUE glGenTextures(1,&texture[0]); //CreateTheTexture //TypicalTextureGenerationUsingDataFromTheBitmap glBindTexture(GL_TEXTURE_2D,texture[0]); glTexImage2D(GL_TEXTURE_2D,0,3,TextureImage[0]->sizeX,TextureImage[0]->sizeY,0,GL_RGB,GL_UNSIGNED_BYTE,TextureImage[0]->data); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); } if(TextureImage[0]) //IfTextureExists { if(TextureImage[0]->data) //IfTextureImageExists { free(TextureImage[0]->data); //FreeTheTextureImageMemory } free(TextureImage[0]); //FreeTheImageStructure } returnStatus; //ReturnTheStatus}GLvoidReSizeGLScene(GLsizeiwidth,GLsizeiheight) //ResizeAndInitializeTheGLWindow{ 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,100.0f); glMatrixMode(GL_MODELVIEW); //SelectTheModelviewMatrix glLoadIdentity(); //ResetTheModelviewMatrix}intInitGL(GLvoid) //AllSetupForOpenGLGoesHere{ if(!LoadGLTextures()) //JumpToTextureLoadingRoutine(NEW) { returnFALSE; //IfTextureDidn'tLoadReturnFALSE } glEnable(GL_TEXTURE_2D); //EnableTextureMapping(NEW) glShadeModel(GL_SMOOTH); //EnableSmoothShading glClearColor(0.0f,0.0f,0.0f,0.5f); //BlackBackground glClearDepth(1.0f); //DepthBufferSetup glEnable(GL_DEPTH_TEST); //EnablesDepthTesting glDepthFunc(GL_LEQUAL); //TheTypeOfDepthTestingToDo glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST); //ReallyNicePerspectiveCalculations returnTRUE; //InitializationWentOK}intDrawGLScene(GLvoid) //Here'sWhereWeDoAllTheDrawing{ glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); //ClearTheScreenAndTheDepthBuffer glLoadIdentity(); //ResetTheView glTranslatef(0.0f,0.0f,-5.0f); glRotatef(xrot,1.0f,0.0f,0.0f); glRotatef(yrot,0.0f,1.0f,0.0f); glRotatef(zrot,0.0f,0.0f,1.0f); glBindTexture(GL_TEXTURE_2D,texture[0]); glBegin(GL_QUADS); //FrontFace glTexCoord2f(0.0f,0.0f);glVertex3f(-1.0f,-1.0f,1.0f); glTexCoord2f(1.0f,0.0f);glVertex3f(1.0f,-1.0f,1.0f); glTexCoord2f(1.0f,1.0f);glVertex3f(1.0f,1.0f,1.0f); glTexCoord2f(0.0f,1.0f);glVertex3f(-1.0f,1.0f,1.0f); //BackFace glTexCoord2f(1.0f,0.0f);glVertex3f(-1.0f,-1.0f,-1.0f); glTexCoord2f(1.0f,1.0f);glVertex3f(-1.0f,1.0f,-1.0f); glTexCoord2f(0.0f,1.0f);glVertex3f(1.0f,1.0f,-1.0f); glTexCoord2f(0.0f,0.0f);glVertex3f(1.0f,-1.0f,-1.0f); //TopFace glTexCoord2f(0.0f,1.0f);glVertex3f(-1.0f,1.0f,-1.0f); glTexCoord2f(0.0f,0.0f);glVertex3f(-1.0f,1.0f,1.0f); glTexCoord2f(1.0f,0.0f);glVertex3f(1.0f,1.0f,1.0f); glTexCoord2f(1.0f,1.0f);glVertex3f(1.0f,1.0f,-1.0f); //BottomFace glTexCoord2f(1.0f,1.0f);glVertex3f(-1.0f,-1.0f,-1.0f); glTexCoord2f(0.0f,1.0f);glVertex3f(1.0f,-1.0f,-1.0f); glTexCoord2f(0.0f,0.0f);glVertex3f(1.0f,-1.0f,1.0f); glTexCoord2f(1.0f,0.0f);glVertex3f(-1.0f,-1.0f,1.0f); //Rightface glTexCoord2f(1.0f,0.0f);glVertex3f(1.0f,-1.0f,-1.0f); glTexCoord2f(1.0f,1.0f);glVertex3f(1.0f,1.0f,-1.0f); glTexCoord2f(0.0f,1.0f);glVertex3f(1.0f,1.0f,1.0f); glTexCoord2f(0.0f,0.0f);glVertex3f(1.0f,-1.0f,1.0f); //LeftFace glTexCoord2f(0.0f,0.0f);glVertex3f(-1.0f,-1.0f,-1.0f); glTexCoord2f(1.0f,0.0f);glVertex3f(-1.0f,-1.0f,1.0f); glTexCoord2f(1.0f,1.0f);glVertex3f(-1.0f,1.0f,1.0f); glTexCoord2f(0.0f,1.0f);glVertex3f(-1.0f,1.0f,-1.0f); glEnd(); xrot+=0.1f; yrot+=0.1f; zrot+=0.05f; returnTRUE; //KeepGoing}GLvoidKillGLWindow(GLvoid) //ProperlyKillTheWindow{ if(fullscreen) //AreWeInFullscreenMode? { ChangeDisplaySettings(NULL,0); //IfSoSwitchBackToTheDesktop ShowCursor(TRUE); //ShowMousePointer } if(hRC) //DoWeHaveARenderingContext? { if(!wglMakeCurrent(NULL,NULL)) //AreWeAbleToReleaseTheDCAndRCContexts? { 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 wc.style =CS_HREDRAW|CS_VREDRAW|CS_OWNDC; //RedrawOnSize,AndOwnDCForWindow. 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 wc.hbrBackground =NULL; //NoBackgroundRequiredForGL 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 memset(&dmScreenSettings,0,sizeof(dmScreenSettings)); /