Feasibility of GPU-like behavior

[jbikker]

Hi,

I would like to investigate the possibility of using your project as a basis for a simple GPU. The idea is as follows:

1. MSX triggers rendering a frame on the pi using io ports
2. pi renders the frame using a software rasterizer
3. pi translates the frame to MSX data: layout table and pattern table (GRAPHIC3)
4. pi makes this data available as 'ROM data' to MSX
5. MSX reads the data and copies it to VRAM
6. MSX outputs the frame.

I can imagine that bandwidth and such may be challenging, but apart from that, would this be possible? My main concern is: could a ROM that your device feeds to the MSX be modified 'live' by the pi? And, if this data is double buffered, would it be possible to synchronize the process between MSX and pi in a somewhat efficient manner?

Feel free to contact me at bikker.j at gmail.com, would love to discuss this in more detail.