[HLSL.and.Pixel.Shaders.for.XAML.Developers(Early.Release,2012.4)].Walt.Ritscher.文字版

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1、O’ReillyMedia,Inc.4/5/20121Shader101ItseemsanobviousquestiontoaskatthebeginningofanHLSLandshaderbook;whatexactlyisashader?It’sasmallprogramoralgorithmwrittenexplicitlytorunonacomputerGraphicsProcessingUnit(GPU).ItprovidesawayfordeveloperstoextendtherenderingcapabilitiesoftheGPU.Anyprogramthatw

2、orkscloselywithgraphicswillbenefitfromusingshaders.Thevideogameindustryspinsoffcustomshadersbythethousands,theyareasvitaltogameprojectsasbusinessentityclassesaretolineofbusinessapplications.Nothingprohibitsbusinessprogrammersfromexperimentingwithshadersintheirlineofbusiness(LOB)applications,in

3、factrecenttrendsinuserinterface(UI)designandinformationvisualizationcryoutforshaderuse.BecauseshadersrunatthekernelleveloftheGPUtheyareautomaticallyparallelizedbytheGPUhardwareandareextremelyfastatmanipulatinggraphicoutput.Typically,theGPUcanprocessshadersseveralordersofmagnitudefasterthanifth

4、eshadercodeisrunonaCPU.WhyXAMLdevelopersshouldlearnHLSL?IfyouareaXAMLdeveloper,I’llwageryou’veheardaboutpixelshaders.Infact,youmaybeusingsomeoftheseeffectsinyourapplicationalready.WPFintroducedtheDropShadowEffectandBlurEffectin.NET3.5SP1andbothoftheseclassestakeadvantageofpixelshaders.Silverli

5、ghtaddedpixelshadersinSilverlight3.TheWindowsPhoneteamdisappointeddevelopersbydroppingsupportforshadersbeforethefinalreleaseoftheirhardware.Microsofthadgoodreasontoditchphoneshadersastheycausedasignificantdragonperformance,buttheirlossisstilllamentable,TomakeupforthatsetbacktheSilverlight5rele

6、aseincludessupportforXNAmodelsandshaders.ThisisawesomenewsasitmeansthatyoucanmixXNAandSilverlight5togetherinthesameapplicationandthatgivesyouaccesstoanotheressentialshadertype;theVertexshader.XNAisaMicrosoftframeworkthatfacilitatesgamedevelopmentonthePC,theXbox360,andWindowsPhone7.Itgiveyouacc

7、esstothepowerofDirectXwithouthavingtoleavethecomfortofyourfavorite1O’ReillyMedia,Inc.4/5/2012.NETprogramminglanguages.TolearnmoreaboutXNAgetacopyofLearningXNA4.0byAaronReedfrom:http://shop.oreilly.com/product/0636920013709.doAsaXAMLdeve