Fast mobile shaders or rather Mobile! Fast!

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Precision: fixed / lowp•••-2.0 .. 2.0, 8 bit fixed pointColors, some normalized vectorsAvoid swizzles and scalar lowplowp good for most colors and some normalized vectors.Note that at least -2.0 .. 2.0 range is guaranteed, but clamping to +-2 may or might nothappen depending on the GPU and the driver (i.e. GPU might have much larger range forlowp).Avoid lowp if it will need fancy swizzles or be involved in purely scalar computations.
Precision: half / mediump••16 bit float; like DX9 HLSL’s halfMost UVs, 2D vectors, general “nohigh precision needed” usemediump just like “half” in DX9. This is good for most general stuff that does not explicitlyneed higher precision.
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Fast mobile shadersor ratherMobile!
Page 3 and 4: Outline• Desktop vs. Mobile• GP
Page 5 and 6: Mobile•••Needs to use 100x le
Page 7 and 8: Old Is New•Techniques from 2001 i
Page 9 and 10: Workload••Frequency of computat
Page 11 and 12: Scene•••Opaque is the bestAvo
Page 13 and 14: “Onload” CPU?••More fast co
Page 15 and 16: GPU Species••••ImgTec Power
Page 17 and 18: Architectures•Tiled Deferred• P
Page 19 and 20: Case: HSR Performance•0.8-3.5ms t
Page 21 and 22: Hidden Surface Removal•Simple geo
Page 23 and 24: Saving BW & ALU•Framebuffer write
Page 25 and 26: Tiled Framebuffers•Higher Z preci
Page 27 and 28: Case: MSAA•4xMSAA, iPad2• 6ms i
Page 29 and 30: Case: Mipmaps•••Turn off mipm
Page 31 and 32: Case: OptimizingSHADOWGUN forTegra
Page 33 and 34: SHADOWGUN+Tegra2••Target 30 FPS
Page 35 and 36: Sort opaque geometry!•Saved ~15ms
Page 37 and 38: LUT Baking ToolsAnother bonus: sinc
Page 39 and 40: Texture Compression•••Tegra h
Page 41 and 42: Profiling toolsTools
Page 43 and 44: PVRUniSCoPVRUniSCo gives cycles for
Page 45 and 46: PerfHUD ES
Page 47 and 48: Tools: Android + Adreno•Adreno Pr
Page 49 and 50: Shader Performance
Page 51 and 52: GLSL ES specific•Precision qualif
Page 53: General Intuition•••Note: Han
Page 57 and 58: Precision•Minimize conversion bet
Page 59 and 60: Shader Performance•Some shaders
Page 61 and 62: Shader Performance••Normalized
Page 63 and 64: Relative Performance•All lines in
Page 65 and 66: Unannouced TitleHigh poly, lots of
Page 67 and 68: Current state••37FPS after opti
Page 69 and 70: Getting GPU time on iOS•Force CPU
Page 71 and 72: Post-processing•Precision: lowp/f
Page 73 and 74: Burning Walls shader
Page 75 and 76: Burning Walls shader•Saved ~8ms p
Page 77 and 78: Optimize Particles•Reduce overdra
Page 79 and 80: Case: AngryBots
Page 81 and 82: AngryBots••Not much optimizatio
Page 83 and 84: Added for PC•••Depth of Field
Page 85 and 86: Wet floor•Render subset of scene
Page 87 and 88: Planar reflection
Page 89 and 90: Albedo
Page 91 and 92: Gloss (A of albedo tex)
Page 93 and 94: Pixel shader
Page 95 and 96: Splashes: geom + atlasWater splashe
Page 97 and 98: Post-fx costs••At native device
Page 99 and 100: Combine post-fx•Color Correction
Page 101 and 102: Cheat a bit•Scratch texture on no
Page 103 and 104: FXAA•Fast Approximate AA• Post
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Fail #1•FXAA is all float/highp
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Win #1•Use more (5) vec2 varyings
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FXAA 3.11•Latest FXAA 3.1 “cons
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Optimizing FXAA 3.11•Down to 12.7
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Extra SlidesExtra stuff we had init
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“Proper way”•Bake a bunch of
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Actually reflectedThis is what is a
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Ta-da!
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Reflection UVs••Not much physic
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Without Bloom
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Also Color Adj•Can also do simple
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“Mood Boxes” in Unity 3.4 Angry
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Mood Boxes•When entering new mood
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Fast mobile shaders or rather Mobile! Fast!

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