给图形着色.docx
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给图形着色
给图形着色
一、实验目的及要求
1）掌握OPENGL中一些常用函数
2）掌握两种不同的着色方法：
Flatcoloring（单调着色），Smoothcoloring（平滑着色）
二、实验内容
1）创建Project，完成一个三角形的平滑着色和一个正方形的单调着色的显示算法
2）运行程序，观察结果，体会两者的区别，给出显示结果
三、实验的核心算法（C参考程序）及实验结果
1、图形着色的部分核心代码如下：
#include"StdAfx.h"//HeaderFileForWindows
#include//HeaderFileForStandardInput/Output
#include//HeaderFileForTheMathLibrary
#include//HeaderFileForTheOpenGL32Library
#include//HeaderFileForTheGLu32Library
#include//HeaderFileForTheGlauxLibrary
#pragmacomment（lib,"GLAUX.LIB"）
#pragmacomment（lib,"GLU32.LIB"）
#pragmacomment（lib,"OPENGL32.LIB"）
HDChDC=NULL;//PrivateGDIDeviceContext
HGLRChRC=NULL;//PermanentRenderingContext
HWNDhWnd=NULL;//HoldsOurWindowHandle
HINSTANCEhInstance;//HoldsTheInstanceOfTheApplication
boolkeys[256];//ArrayUsedForTheKeyboardRoutine
boolactive=TRUE;//WindowActiveFlagSetToTRUEByDefault
boolfullscreen=TRUE;//FullscreenFlagSetToFullscreenModeByDefault
floatpoints[45][45][3];//TheArrayForThePointsOnTheGridOfOur"Wave"
intwiggle_count=0;//CounterUsedToControlHowFastFlagWaves
GLfloatxrot;//XRotation（NEW）
GLfloatyrot;//YRotation（NEW）
GLfloatzrot;//ZRotation（NEW）
GLfloathold;//TemporarilyHoldsAFloatingPointValue
GLuinttexture[1];//StorageForOneTexture（NEW）
LRESULTCALLBACKWndProc（HWND,UINT,WPARAM,LPARAM）;//DeclarationForWndProc
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
{
glShadeModel（GL_SMOOTH）;//启用阴影平滑
glClearDepth（1.0f）;//设置深度缓存
glEnable（GL_DEPTH_TEST）;//启用深度测试
glDepthFunc（GL_LEQUAL）;//所作深度测试的类型
glHint（GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST）;//真正精细的透视修正
returnTRUE;//InitializationWentOK
}
intDrawGLScene（GLvoid）//此过程中包括所有的绘制代码
{
glClear（GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT）;//清除屏幕及深度缓存
glLoadIdentity（）;//重置模型观察矩阵
glTranslatef（-1.5f,0.0f,-6.0f）;//左移1.5单位，并移入屏幕6.0
glBegin（GL_TRIANGLES）;//绘制三角形
glColor3f（1.0f,0.0f,0.0f）;//设置当前色为红色
glVertex3f（0.0f,1.0f,0.0f）;//上顶点
glColor3f（0.0f,1.0f,0.0f）;//设置当前色为绿色
glVertex3f（-1.0f,-1.0f,0.0f）;//左下
glColor3f（0.0f,0.0f,1.0f）;//设置当前色为蓝色
glVertex3f（1.0f,-1.0f,0.0f）;//右下
glEnd（）;//三角形绘制结束
glTranslatef（3.0f,0.0f,0.0f）;//右移3单位
glColor3f（0.5f,0.5f,1.0f）;//一次性将当前色设置为蓝色
glBegin（GL_QUADS）;//绘制正方形
glVertex3f（-1.0f,1.0f,0.0f）;//左上
glVertex3f（1.0f,1.0f,0.0f）;//右上
glVertex3f（1.0f,-1.0f,0.0f）;//左下
glVertex3f（-1.0f,-1.0f,0.0f）;//右下
glEnd（）;//正方形绘制结束
returnTRUE;//继续运行
}
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）
{
GLuintPixelFormat;//HoldsTheResultsAfterSearchingForAMatch
WNDCLASSwc;//WindowsClassStructure
DWORDdwExStyle;//WindowExtendedStyle
DWORDdwStyle;//WindowStyle
RECTWindowRect;//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
}
staticPIXELFORMATDESCRIPTORpfd=//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,//NoAlphaBu
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