Christina_Coffin_Programming_SPU_Based_Deferred - Dice

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Agenda Introduction SPU lighting overview SPU lighting practicalities & algorithms Code optimizations & development practices Best practices Conclusions Q&A Tuesday, March 8, 2011 Before getting into the lowlevel bits of SPU based deferred shading in the frostbite 2 engine, I want to briefly cover the motivations behind this.
Introduction Maxxing out mature consoles Tuesday, March 8, 2011 Playstation 3 turns 5 years old this fall = mature console, For some of us, that means we’ve been working with the hardware a year or two longer than that. Developers want more out of fixed hardware, time to get creative! Everyone has already employed basic optimization strategies Such as the SPU Edge libraries for mesh vertex processing, using half floats in gpu shaders and so on... Days of writing code once that runs on all platforms is over for some things, especially rendering. >>We must be competitive versus First party / single console developers that have the luxury of only worrying about 1 platform.
Page 1: SPU-based Deferred Shading for Batt
Page 5 and 6: Past: Frostbite 1 Forward Rendered
Page 7 and 8: Precomputed + Static = L Tuesday, M
Page 9 and 10: Why SPU-based Deferred Shading Want
Page 11 and 12: Multiple lighting models + material
Page 13 and 14: Rendering Frame Timeline Note: Siz
Page 15 and 16: Setup Rendering Data Flow Cell Memo
Page 17 and 18: Setup Rendering Data Flow Cell Memo
Page 19 and 20: SPU Tile Based Shading work units T
Page 21 and 22: SPU Shading Flow Overview For each
Page 23 and 24: Getting the Tile Data onto SPUs....
Page 25 and 26: SPU LIGHT TILE CULLING Tuesday, Mar
Page 27 and 28: SPU SHADING LOOP Tuesday, March 8,
Page 29 and 30: Core shading components 3MRT + Z =
Page 31 and 32: Gbuffer data expansion to SoA for s
Page 33 and 34: DMA output finished pixels Finished
Page 35 and 36: ALGORITHMIC OPTIMIZATIONS Tuesday,
Page 37 and 38: Tile Light Culling 2 Light Culling
Page 39 and 40: SubTile Light Culling SPU LS FB Til
Page 41 and 42: Lights per 64x64 pixel tile Tuesday
Page 43 and 44: The upside of all of this culling w
Page 45 and 46: Algorithmic optimization #0 Tuesday
Page 47 and 48: Algorithmic optimization #0 Materia
Page 49 and 50: Algorithmic optimization #1 Normal
Page 51 and 52: Tuesday, March 8, 2011
Page 53 and 54:
Algorithmic optimization #2 Support
Page 55 and 56:
Algorithmic optimization #4 Branch
Page 57 and 58:
Branching if attenuation for 16 pix
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Branching if attenuation for 16 pix
Page 61 and 62:
Algorithmic optimization #5 No Ligh
Page 63 and 64:
Algorithmic Optimization # 6 Spheri
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CODE OPTIMIZATIONS Tuesday, March 8
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Code optimization #1: Loop Unrollin
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Page 71 and 72:
Page 73 and 74:
Code optimization #3 Instruction Pi
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Specular power LUT From a GPU shade
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Code Optimization # 5 SPU Shading C
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BEST PRACTICES Tuesday, March 8, 20
Page 81 and 82:
Possible Code Permutations Material
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’SPA’ (SPU ASSEMBLER) Tuesday,
Page 85 and 86:
’SPA’ (SPU ASSEMBLER) SPA is go
Page 87 and 88:
Conclusions SPUs are more than capa
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Special Thanks ›Johan Andersson
Page 95:
References A Bizarre Way to do Real
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Christina_Coffin_Programming_SPU_Based_Deferred - Dice

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