Fork of bsnes with various performance improvements.
C++ C Makefile Limbo GLSL Shell
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Latest commit 559b513 Dec 5, 2017 @Alcaro Alcaro Merge pull request #60 from orbea/clean
Make clean is cleaning the wrong directories.
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ananke #59 Dec 3, 2017
data Reset permissions to sane values. C++ sources are not executable. Apr 26, 2014
emulator Flip this one backwards - core asks for what it needs, instead of the… Aug 19, 2014
fc Reset permissions to sane values. C++ sources are not executable. Apr 26, 2014
gb Add cheat decoding support. Ported straight from bsnes-libretro. Apr 3, 2017
gba Fix the mode of these too. Apr 26, 2014
libco Not all compiles define lr. Use x30 instead. Sep 23, 2017
nall Add aarch64 to nall intrinsics Sep 23, 2017
obj Initial commit Mar 10, 2014
out out/.gitignore: Don't accidentally commit compiled cores Mar 25, 2017
phoenix Fix the mode of these too. Apr 26, 2014
processor MASSIVE warnings fix like in libretro-bsnes Feb 19, 2015
profile Reset permissions to sane values. C++ sources are not executable. Apr 26, 2014
ruby Fix the mode of these too. Apr 26, 2014
sfc change dsp register initialization to match v102r27 Jun 28, 2017
shaders Reset permissions to sane values. C++ sources are not executable. Apr 26, 2014
target-ethos mercury now builds all three profiles without a make clean Feb 22, 2015
target-libretro add gamma ramp core option Sep 17, 2017
.travis.yml travis: define CXX11 Oct 24, 2017
LICENSE Initial commit Mar 10, 2014
Makefile Remove .Manifest and .res files from the make clean target. Dec 4, 2017
README.md Made the README look nicer Nov 25, 2017
changes-libretro.diff Update this diff thing. Aug 10, 2015
changes.diff Update this diff thing. Aug 10, 2015

README.md

bsnes-mercury

bsnes-mercury is a fork of higan, aiming to restore some useful features that have been removed, as well as improving performance a bit. Maximum accuracy is still uncompromisable; anything that affects accuracy is optional and off by default.

Changes to upstream:

  • The biggest change is getting the interface sane, which is accomplished through libretro.
  • 'inline' was added all across the PPU subclasses. Framerate went up by 20% from such a trivial change! (Spamming inline elsewhere does little if anything, so it wasn't done.)
  • A fast path was added to various parts of the CPU bus, improving framerate by about 2.5%.
  • libco has been changed quite a bit, both for performance, readability, and portability to more platforms.
  • A seven-line function in sfc/memory/memory-inline.hpp was replaced, which speeds up ROM load by roughly a factor 6 (1.2s -> 0.2s). (This change was developed for upstream, and the author of higan was mostly positive; it is likely to appear in bsnes v095.)
  • A section in sfc/memory/memory.cpp was specialized for the common, easy, case. This speeds up ROM load time by about a third.
  • HLE emulation of some special chips is optionally restored (defaults to LLE), to improve performance and reduce reliance on those chip ROMs (they're not really easy to find). Chips for which no HLE emulation was developed (ST-0011 and ST-0018) are still LLE.
  • SuperFX overclock is now available (off by default, of course); if enabled, it makes Star Fox look quite a lot smoother.

Todo list:

  • Is the compat core's DSP identical to that of the accuracy core, but a bit faster?
  • Examine if ST-0011 is confused by attempts to HLE it.

The name is because metals are shiny, like the accuracy promises of bsnes, and mercury is the fastest metal.