Create a 3D game engine for pebble

[2016-10-29 Sat 14:05:19] speaker: Shipeng Xu event: GeekcampSG 2016

What we need to do

• generic way of rendering 3D images
• flexible
• high frame rates

Pebble time specs

• 64 color epaper, always on, 144 x 168
• STM32 cpu limited to 100 MHz
• Lattice LP1K FPGA

Graphics pipeline

• 3d mesh
• -> vertex processing
• triangles in screen space
• -> rasterization
• fragments
• -> raster operations
• fragment with colors
• -> fragment processing
• image output

Phone side rendering

• rendering on the phone takes 0.24s
• send back to watch takes 8.46s
• each frame is sent as 14 messages due to message size limit
• too slow! reduce the resolution so that it fits in one message

Watch side rendering

• work in progress
• porting the javascript from phone over result in lack of memory