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Quake 3: OpenGL → GL ES:                                   Overview
• Porting the Engine...
    • Overview of the changes ...
Porting the Engine...
• Everything is native OpenGL ES/EGL
    • Except PulseAudio sound via SDL (but this could be done n...
Input Challenges...
• We don't have a conventional keyboard and mouse, but, we do have:
    • Mini-keyboard,
    • Touchsc...
Demonstration!

        Email comments,
Maybe you'll see this in Ovi store!




               quake.on.maemo@gmail.com
  ...
Thanks!




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Maemo Summit Quake3

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Maemo Summit Quake3

  1. 1. Quake 3: OpenGL → GL ES: Overview • Porting the Engine... • Overview of the changes from OpenGL to GL ES. • Quick-n-dirty optimization: 1/sqrt(x) • Input Challenges... • Dealing without a conventional keyboard and mouse. • Exploring different input methods on N900. • Aiming assist, and why it's not cheating. • Demonstration! • Closing remarks, comments, etc. 1
  2. 2. Porting the Engine... • Everything is native OpenGL ES/EGL • Except PulseAudio sound via SDL (but this could be done natively too.) • Modest amount of changes to the source code: – 58 files changed, 3071 insertions(+), 502 deletions(-) • 1/sqrt(x) Optimization: • Required for vector normalization and a major bottleneck in the engine. – Fast Inverse Square Root, by Chris Lomont • ARM performs much faster by simply using the standard libc version, • But optimizing with NEON instructions would certainly help. 2
  3. 3. Input Challenges... • We don't have a conventional keyboard and mouse, but, we do have: • Mini-keyboard, • Touchscreen, • Accelerometer, and • Proximity sensor. • Special thanks to Phil Carmody for his efforts and code for the accelerometer/proximity sensor. • Added support for auto-aim (aka aiming assist) • Limitations from not having a full keyboard and mouse. • The game must still be fun! • The best way to show how these are used is in the demonstration. • I will also take questions/comments during the demo. 3
  4. 4. Demonstration! Email comments, Maybe you'll see this in Ovi store! quake.on.maemo@gmail.com 4
  5. 5. Thanks! 5

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