3d游戏编程：opengl纹理和缓存

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1、OpenGL:Texture&BuffersYanciZhangGameProgrammingIIOutlineConceptoftexturemappingDifficultiesandsolutionsintexturemappingTexturemappinginOpenGLBuffersinOpenGLGameProgrammingIITextureMappingHowtoaddmoredetailstosurfaces?UsingmoretrianglesUsingtext

2、uremappingwithoutincreasinggeometrycomplexityShadingTextureMappingGameProgrammingIITextureMappingAdvancedtexturemappingtechniquescanaddmoredetails!GameProgrammingIITextureMappingUsesoftexturemappingSimulatematerialsReducinggeometriccomplexityImag

3、ewarpingReflection…GameProgrammingIITextureMappingWhatwecandonowUsingvertexcolortospecifyobjectcolorUsinglightsourcesandobjectmaterialstoproducemorerealisticresultButthesearefarfromenough!RealobjectshavelotsofdetailsTexturemappingcanAdddetail

4、stosurfacesNotincrease#ofverticesGameProgrammingIIWhatisTextureMapping1/2AtextureisabitmapofpixelcolorsthatgiveanobjecttheappearanceoftextureMapping2Dimagesto3DsurfacesTexturecanbe1D,2Deven3DKeyquestion:howtobuildtheconnectionbetween2Dtexturecoor

5、dinatesand3DobjectcoordinatesGameProgrammingIIWhatisTextureMapping2/2GameProgrammingIITextureMappinginPipelineImagesandgeometryflowthroughseparatepipelinesthatjoinattherasterizerTexturesdoNOTaffectgeometriccomplexityEveryvertexhasitsowntexturecoord

6、inateTexturecoordinatesoffragmentsareinterpolatedfromverticesinrasterizztionstageTexturelookupsareexecutedinfragmentprocessingstageGameProgrammingIICoordinateSystemsScreenCoordinatesWherethefinalimageisproducedWorldCoordinatesConceptually,wheret

7、hemappingtakesplaceTexturecoordinatesUsedtoidentifypointsintheimagetobemappedParametriccoordinatesMaybeusedtomodelcurvedsurfacesGameProgrammingIIDifficultiesThemapfromtexturecoordinatestogeometriccoordinatesmaybeacomplexfunctionormayhaveundesirab

8、lepropertiesPrefertheinversemapfromscreencoordinatestotexturecoordinatesAntialiasingproblemGameProgrammingIIForwardandBackwardMappingForwardmappingTexturecoordinate(s,t)geometriccoordinate(x,y,z,w)Suchmappingmaybehardtobebuiltinpractice