Description
Presuming #78 gets merged, there will be four hacks left that aren't directly related to intentional accuracy sacrifices for speed. Two in particular look like low hanging fruit:
https://github.com/bsnes-emu/bsnes/blob/master/bsnes/target-bsnes/program/hacks.cpp#L25
//the dialogue text is blurry due to an issue in the scanline-based renderer's color math support
if(title == "マーヴェラス") fastPPU = false;
//stage 2 uses pseudo-hires in a way that's not compatible with the scanline-based renderer
if(title == "SFC クレヨンシンチャン") fastPPU = false;
These work correctly with the pixel-based PPU. I can't make sense of how to port the fixes from it to the scanline-based PPU, but I'm making an issue report in the hopes someone else can.
The color blending code for the pixel-based PPU is here:
https://github.com/bsnes-emu/bsnes/blob/master/bsnes/sfc/ppu/screen.cpp#L32
The color blending code for the scanline-based PPU is here:
https://github.com/bsnes-emu/bsnes/blob/master/bsnes/sfc/ppu-fast/line.cpp#L106
Also worth noting is this issue affects higan-emu's ppu-performance, only there's no hacks in place with it:
https://github.com/higan-emu/higan/blob/master/higan/sfc/ppu-performance/dac.cpp#L33
A fix for this would improve both emulators.