RGB Framebuffer ideas

1) Write directly to EFB, use GX to copy to XFB
+ No CPU overhead
- Max yres of 528
- Max xres of 640
- No ypan or ywrap

2) Write to RAM, use CPU to copy to XFB
- Large CPU overhead
+ Max yres of 574
+ Max xres of 720
+ ypan or ywrap

3) Write to RAM, use CPU copy to EFB, use GX to copy to XFB
- small CPU overhead
- Max yres of 528
- Max xres of 640
+ ypan or ywrap

4) Write to RAM, use CPU to create texture, use GX to draw texture to
EFB and copy to XFB
- some CPU overhead
- Max yres of 528
- Max xres of 640
+ ypan or ywrap



CPU overhead could be reduced for mostly static images using deferred IO.
http://lwn.net/Articles/259210/

-- 
Malcolm Parsons

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