3d游戏编程：opengl入门

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1、OpenGL:IntroductionYanciZhangGameProgrammingIIOutlineOverviewofOpenGLOpenGLvs.DirectXOpenGL“HelloWorld”GLUTlibraryRenderingpipelineCoordinatesystemGameProgrammingIIWhatisOpenGL?OpenGL=OpenGraphicsLibraryGraphicsrenderingAPIProducehigh-qualitycolorimagescomposedof3Dgeometricobject

2、sandimagesHardwareindependentCrossplatformGameProgrammingIIBasicFunctionBasesformanyadvanceddatastructuresingameprogrammingTypicalapplicationsScenegraphStategraphDecisiontreeKd-tree,quadtree…GameProgrammingIIWhatCanOpenGLDo?Renderingbasicprimitives,likepoints,lines,triangles…Ma

3、trixoperationsLocalilluminationTexturemappingPixeloperations…GameProgrammingIIWhatCanNotOpenGLDo?CreatewindowsHandlewindoweventsResponsetouserinputScenemanagement…GameProgrammingIIOpenGLvs.DirectX1/2OpenGLisonlygraphicslibraryDirectXhandlesgraphics,audio,userinputUseOpenGLimpr

4、operly,systemdoesnothingUseDirectXimproperly,systemdoessomethingbeyondexpectationGameProgrammingIIOpenGLvs.DirectX2/2OpenGLIndustrystandardmaintainedbyOpenGLArchitecturalReviewBoard(ARB)StablefunctioninterfaceCrossplatformVeryclean,easytolearnDirectXMicrosoft’sproductInstablefu

5、nctioninterfaceOnlysupportWindowsGameProgrammingIIOpenGLFunctionsNamingWithprefixglCapitalletterforeachnewwordExamplesglBegin,glEndglEnable,glDisableglClearGameProgrammingIIDataType&ConstantBasicdatatypeWithprefixGLAllsmalllettersSimilartoC++datatypeExample:GLdouble=double,GL

6、float=float,GLint=int,GLuint=unsignedintConstantWithprefixGL_AllcapitallettersExamples:GL_POINTS,GL_CCWGameProgrammingIIHelloWorld1/3#includeAllopenglprogramsshouldincludegl.h.#includeAlmostallopenglprogramsincludeglu.hmain(){initWindow();Initializewindowwhichisapla

7、tform-dependentoperationglClearColor(0.0,0.0,0.0,0.0);ClearwindowswithblackcolorglClear(GL_COLOR_BUFFER_BIT);glColor3f(1.0,1.0,1.0);UsewhitecolortostartrenderingsomethingonthescreenglOrtho(0.0,1.0,0.0,1.0,-1.0,1.0);SpecifyprojectionmatrixGameProgrammingIIHelloWorld2