byuu says:
Changelog:
- sfc/ppu-fast: added a barebones background renderer; very incomplete
Right now, the 2bpp Mega Man X2 splash screen is rendering correctly,
but everything else looks really garbled. I'm thinking my tile cache
conversions from 4bpp to bitmap pixels is wrong, but I'm not seeing any
obvious issues.
If anyone wants to take a look at it, I'd appreciate it. The renderer is
mostly modeled after ppu-performance's.
byuu says:
Changelog:
- sfc/ppu: collapsed folders to a single directory to match all other
emulated processors
- sfc/ppu-fast: implemented I/O registers
byuu says:
Changelog:
- SNES: started on skeleton of the new parallel PPU core
To build the new PPU core, set profile=fast via GNU make. The old core
is profile=accurate.
The names of the profiles, and the name of the folder for the fast PPU
are subject to change.
The new PPU core doesn't do anything but demonstrate the proof of
concept: every scanline, make a copy of all the PPU registers and CGRAM.
Share the VRAM and OAM. Batch render all scanlines at once using OpenMP
at the end of each frame and blit the result.
With no PPU core at all, bsnes runs 91% faster than with the accuracy
PPU (230fps vs 120fps.) That's the absolute theoretical best-case
scenario. With the skeleton in place, we're already around 220fps. It'll
go down more as the PPU line renderer starts to do real work. I don't
know where things will end up yet. I suppose we'll find out in time.
My own copy of TDM/GCC can't use OpenMP on Windows, so ... it won't
parallelize if you build with that. I'm going to have to switch to a
different MinGW distribution once this is complete, I suppose.
Tim Allen