OpenGL interceptor for Warp

1
OpenGL interceptor for WarpBlend

• Brendan Walters
• COMP770 Final Project Proposal
• Spring 2009

2
WarpBlend

• Turn arbitrary surfaces into immersive 3D
  environments.
• Multiple projectors on one or more hosts.
• Currently must be integrated directly in target
  application.

3
A-Desk

• Immersive workspace
• Projectors allow continuous curved display
• Runs custom workspace app.
• Goal desktop-on-surface, any application runs in
  the space.

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A-Desk Desktop

• Linux only
• Based on Compiz
• Status
• Curved calibrations work on Linux but not in
  Compiz
• Multiple projectors should be supported with
  latest WB port.
• Shortcomings
• OpenGL apps warp as windows not as environments.

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OpenGL interception

• Stand-in OpenGL library
• Gets only limited information
• Often used to re-shade or do multi-machine
  rendering
• Chromium
• Also used to 3-D-ize applications
• TriDef, etc.
• video Mohr and Gleicher

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Critical new components

• Chromium
• Lacks off-axis projection support
• No existing applications appear to re-project
  imagery
• WB uses two methods
• Re-projection of scene onto geometric surface
  representation
• Per-pixel shader

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Goals

• Implement intercepting library that supports and
  automatically applies WarpBlend
• Possible extended goals
• Presentation-worthy A-Desk demo.
• Quick-setup infrastructure for A-Desk demos with
  new applications.
• Alternate OS implementation (primary goal is one
  OS, TBD between Linux and Windows).
• If Linux, A-Desk Compiz integration.
• Merge changes back to WB trunk.

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Prior Work

• Alex Mohr and Michael Gleicher. Non-Invasive,
  Interactive, Stylized Rendering. 2001 ACM
  Symposium on Interactive 3D Graphics. link
• Joel de Vahl. Intercepting OpenGL calls for
  rendering on 3D display. Linköping University
  Student Thesis, 2005. link
• Chromium Parallel, Distributed OpenGL Rendering
  On Commodity Clusters. Lawrence Livermore
  National Laboratory, Stanford University,
  University of Virginia and Tungsten Graphics,
  Inc. link
• glslDevil OpenGL GLSL Debugger. link
• gDEBugger commercial OpenGL application
  debugger. link
• TriDef 3-D Experience Commercial 2D-to-3D
  driver. link

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Thank you!

• Full Proposal
• http//www.cs.unc.edu/waltersb/classes/770/
• (with further links, milestones, slides and
  reports)?
• Questions?