Source data in CELL memory+ StencilSPUSPUSPUPacked array of all lights visible in camera (1000+)SPUSPUSPU

RSXSetup Rendering Data FlowLocal Memor圜ell MemoryMain Geometry Pass (6-10ms)Z Buffer+4 MRTZ Buffer+3 MRTRSX Copy Z+Gbuffers (1.3ms)Inline DWORD Transfer (Spu job kick) GPU Renders GBufferRSX render to local memory GBuffer Data4x MRT ARGB8888 + Z24S8Tiled Memory RSXRendering Frame TimelineNote: Sizes not proportional to time taken!Geometry PassTransfer Gbuffer+Z to CELL memorySPUJob KickCascade Shadows + Particles+ SSAOJTSBarrierPostFx+ FinishSPU 0SPU that finishes last tileclears JTS in cmdBufferby DMASPU Shade JobSPU 1SPU Shade JobSPU 2SPU Shade JobSPU 3SPU Shade JobSPU 4SPU Shade Job RSXRendering Frame TimelineNote: Sizes not proportional to time taken!Geometry PassTransfer Gbuffer+Z to CELL memorySPUJob KickCascade Shadows + Particles+ SSAOJTSBarrierSPU 0SPU Shade JobSPU 1SPU Shade JobSPU 2SPU Shade JobSPU 3SPU Shade JobSPU 4SPU Shade Job Multiple lighting models + materialsStandardMetallicSkinTranslucency SPU Shading OverviewPhysically based specular shading modelEnergy Conserving specular, specular power from 2 to 2048Lighting performed in camera relative worldspace, float precisionfp16 HDR OutputMultiple Materials / Lighting modelsRuns on 5-6 SPUs Why SPU-based Deferred Shading?Want more interesting visual lighting + FXOffload GPU work to the SPUs Having SPU+GPU work together on visuals raises the barAlready developed a tile-based DX 11 compute shaderGood reference point for doing deferred work on SPULots of SPU compute power to take advantage ofSimple sync model to get RSX + SPUs cooperating together Now: Frostbite 2 + Battlefield 3Indoor + Outdoor + Urban HDR lighting solutionComplex lighting with Environment DestructionDeferred shadedMultiple Light types and materialsGoal: ”Use SPUs to distribute shading work and offload the GPU so it can do other work in parallel” Past: Frostbite 1Forward Rendered + Destruction + Limited Lighting SPU-based Deferred Shading for Battlefield 3 on Playstation 3Christina CoffinPlatform Specialist, Senior EngineerDICEĪgendaIntroductionSPU lighting overviewSPU lighting practicalities & algorithmsCode optimizations & development practicesBest practicesConclusionsQ&A

SPU-Based Deferred Shading in BATTLEFIELD 3 for Playstation 3

Battlefield 3 ps3