Fast mobile shaders or rather Mobile! Fast!

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Optimizing FXAA 3.11•••Again some failsLargest gain: use more varyings• AgainTweak precision bit by bit, verifyingif still faster• Tweaking all “by intuition” made it slowerJust like with FXAA 2, tried some steps which were not successful. Largest gains very similar:use more varyings, use mediump for all texture coordinates.Used lowp for most of colors, but not all of them. When I used lowp for all colors, shader gotslower; needed lots of iterations on the device to turn colors into lowp one by one, verifying ifshader did not become slower.
Optimizing FXAA 3.11•Down to 12.7ms iPad2, 16.2ms 3Gs• Was 22.6, 28.3•4xMSAA on this scene: 2.5ms iPad2•If next GPUs would be 4-6x fasterat same resolution, FXAA could bevery attractive!Almost 2x faster on iPad2!12.7ms still way too expensive, but if next generation of mobile GPUs would be 4-6x fasterwhile keeping the same resolution, FXAA for anti-aliasing could become very attractive.
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Fast mobile shadersor ratherMobile!
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Outline• Desktop vs. Mobile• GP
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Mobile•••Needs to use 100x le
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Old Is New•Techniques from 2001 i
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Workload••Frequency of computat
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Scene•••Opaque is the bestAvo
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“Onload” CPU?••More fast co
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GPU Species••••ImgTec Power
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Architectures•Tiled Deferred• P
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Case: HSR Performance•0.8-3.5ms t
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Hidden Surface Removal•Simple geo
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Saving BW & ALU•Framebuffer write
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Tiled Framebuffers•Higher Z preci
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Case: MSAA•4xMSAA, iPad2• 6ms i
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Case: Mipmaps•••Turn off mipm
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Case: OptimizingSHADOWGUN forTegra
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SHADOWGUN+Tegra2••Target 30 FPS
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Sort opaque geometry!•Saved ~15ms
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LUT Baking ToolsAnother bonus: sinc
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Texture Compression•••Tegra h
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Profiling toolsTools
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PVRUniSCoPVRUniSCo gives cycles for
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PerfHUD ES
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Tools: Android + Adreno•Adreno Pr
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Shader Performance
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GLSL ES specific•Precision qualif
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General Intuition•••Note: Han
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Precision: half / mediump••16 b
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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
Page 105 and 106: Fail #1•FXAA is all float/highp
Page 107 and 108: Win #1•Use more (5) vec2 varyings
Page 109: FXAA 3.11•Latest FXAA 3.1 “cons
Page 113 and 114: Extra SlidesExtra stuff we had init
Page 115 and 116: “Proper way”•Bake a bunch of
Page 117 and 118: Actually reflectedThis is what is a
Page 119 and 120: Ta-da!
Page 121 and 122: Reflection UVs••Not much physic
Page 123 and 124: Without Bloom
Page 125 and 126: Also Color Adj•Can also do simple
Page 127 and 128: “Mood Boxes” in Unity 3.4 Angry
Page 129: Mood Boxes•When entering new mood
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