03_parallelism

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1、Lecture3:ParallelizingPipelineExecution(+notesonworkload)KayvonFatahalianCMU15-869:GraphicsandImagingArchitectures(Fall2011)Today▪Briefdiscussionofgraphicsworkload▪StrategiesforparallelizingthegraphicspipelineKayvonFatahalian,GraphicsandImagingArchitectures(CMU15-869,Fa

2、ll2011)Thegraphicspipeline(lasttime)MemoryVertexGenerationVerticesUniformTexture1in/1outVertexProcessingdatabuffers3in/1outPrimitiveGeneration(fortris)PrimitivesUniformTexture1in/smallNoutPrimitiveProcessingdatabuffersRasterization1in/Nout(FragmentGeneration)FragmentsUnif

3、ormTexture1in/1outFragmentProcessingdatabuffersPixels1in/0or1outFrame-BufferOpsFrameBufferKayvonFatahalian,GraphicsandImagingArchitectures(CMU15-869,Fall2011)Programmingthepipeline(lasttime)▪Issuedrawcommandsframe-buffercontentschangeCommandTypeCommandStatechangeBindshaders

4、,textures,uniformsDrawDrawusingvertexbufferforobject1StatechangeBindnewuniformsDrawDrawusingvertexbufferforobject2StatechangeBindnewshaderDrawDrawusingvertexbufferforobject3StatechangeChangedepthtestfunctionStatechangeBindnewshaderDrawDrawusingvertexbufferforobject4Note:effic

5、ientlymanagingstagechangesisamajorchallengeinimplementationsKayvonFatahalian,GraphicsandImagingArchitectures(CMU15-869,Fall2011)Whereisthework?MemoryVertexGenerationVerticesUniformTexture1in/1outVertexProcessingdatabuffers3in/1outPrimitiveGeneration(fortris)PrimitivesUni

6、formTexture1in/smallNoutPrimitiveProcessingdatabuffersRasterization1in/Nout(FragmentGeneration)FragmentsUniformTexture1in/1outFragmentProcessingdatabuffersPixels1in/0or1outFrame-BufferOpsFrameBufferKayvonFatahalian,GraphicsandImagingArchitectures(CMU15-869,Fall2011)Triangle

7、size302010Percentageoftotaltriangles0[0-1][1-5][5-10][10-20][20-30][30-40][40-50][50-60][60-70][70-80][80-90][90-100][>100]Trianglearea(pixels)[source:NVIDIA]Note:tessellationistriggeringareductionintrianglesizeCredit:ProEvolutionSoccer2010(Konami)AmountofdataVertexGene

8、rationCompactmodelCoarseVertices1in/1outVertexProcessingCoarsePrimitivesCoarsePrimitiveProcessing1in/1outHigh-