Tracking Graphics State for Network Rendering
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1 Tracking Graphics State for Network Rendering Ian Buck Greg Humphreys Pat Hanrahan Computer Science Department Stanford University
2 Distributed Graphics How to manage distributed graphics applications, renderers, and displays? Network
3 Virtual Graphics Virtualize the graphics output Serial input to parallel graphics assumes single large resource Virtual
4 Virtual Graphics Virtualize the graphics destination. Driver manages shared resource. assumes owns graphics. Virtual Virtual
5 Virtual Graphics Tiled Rendering Single application rendering to many outputs Parallel Rendering Many applications rendering to a single output Previous Work Window Systems X11 SunRay Visualization Servers GLR GLX
6 Tiled Rendering Network Minimize network traffic Sort first geometry commands Broadcast state commands?
7 Tiled Rendering Network Lazy State Update Issue minimal state commands to sync render
8 Parallel Rendering Hardware context switching too slow.17 ms / switch NVIDIA GeForce 32 streams, 60 fps = 30% Frame Time
9 Parallel Rendering Software context switch Generate state commands for switch Single hardware context
10 Cluster Rendering Network
11 Overview Data structure for generating context comparisons. Tiled Rendering Lazy State Updates Parallel Rendering Soft Context Switching WireGL OpenGL driver for cluster rendering.
12 Context Data Structure Challenge: Generate state commands of context differences. Direct comparison too slow. Acceleration data structure: Track difference information during execution Quick search for comparison Context A Context B
13 Context Data Structure Hierarchical dirty bits Indicate which elements need comparison Texture Lighting Fragment ShadeModel Light0 Position Enable
14 Context Data Structure Hierarchical dirty bits Context A: Context B: glenable(gl_light0) Texture Lighting Fragment ShadeModel Light0 Position Enable
15 Context Diff Context Data Structure Context A Context B Texture Lighting Fragment ShadeModel Light0 gldisable(gl_light0) Position Enable
16 Context Data Structure State command invalidates all other contexts Wide dirty bit vector Lighting Single write invalidates all contexts
17 Tiled Rendering Geometry Bucketing Track object space bounding box Transform object box to screen space Send geometry commands to outputs which overlap screen space extent
18 Tiled Rendering Lazy State Update Defer sending Custom state commands for each render
19 Lazy State Update Virtual Context Matrix: I M 1 Render Contexts Matrix: I M 1 glloadmatrix(m 1 ) Matrix: I Load transform state M 1 Render Geometry
20 Lazy State Update Virtual Context Matrix: M 12 Render Contexts Matrix: M 1 Matrix: I M 2 glloadmatrix(m 2 ) Load transform state M 1 Render Geometry Load transform state M 2 Render Geometry
21 Tiled Rendering Results Marching Cubes.25 Framerate.125 Volume Rendering 1.5 Mtri Surface 1024x768 Outputs 8x4 = 25 Mpixel display 1x1 2x1 2x2 4x2 4x4 8x4 WireGL Broadcast
22 Tiled Rendering Results Quake III 48 Framerate 24 Quake III OpenGL State Intensive Fine Granularity 8x4 dominated by overlap 1x1 2x1 2x2 4x2 4x4 8x4 WireGL Broadcast
23 Parallel Rendering Requires fast context switching between streams
24 Soft Context Switching Generate State Commands Context compare operation to generate state commands Benefits Prevent hardware pipeline flushes Switch time dependent on context differences Matrix: M 1 glloadmatrix(m 2 ) Matrix: M 2
25 Soft Context Switching Results: Varying current color and transformation state. Context switches per second: SGI Infinite Reality SGI Cobalt NVIDIA GeForce WireGL 697 2,101 5, ,699
26 Conclusions State tracking heiarchical dirty bit Allows for fast context comparison operations Enables Virtual Graphics Tiled Rendering Parallel Rendering WireGL
27 Acknowledgements Matthew Eldridge Chris Niederauer Department of Energy contract B504665
28 Tracking Graphics State for Network Rendering Ian Buck Greg Humphreys Pat Hanrahan Computer Science Department Stanford University
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