Leahnaya/bemanitools
1
0
Fork 0
mirror of https://github.com/djhackersdev/bemanitools.git synced 2026-08-24 01:14:03 -05:00
Code Issues Actions Packages Projects Releases Wiki Activity

feat: ddrio-async wrapper/shim driver for async IO

Browse Source 
Wrapper/shim library to drive another ddrio in a dedicated
IO thread. Depending on the other ddrio backend used, this
can significantly improve performance while staying
compatible to the existing ddrio API interface

This turned out to be a good solution to solve performance
problems when running MAME with ddrio-p3io that is
(currently) implemented with synchronous IO calls that are
very costly: ~12 ms for a write over the ACIO protocol, ~4 ms
for a read using an IOCTL. As this already adds up to nearly
a full frame (60 fps) regarding latency, there isn't a lot
of time left to do other stuff in a synchronous update loop.
MAME's performance was unstable and dropped all the time below
100%. The result was a choppy gameplay experience.

Combining ddrio-async with ddrio-p3io, the combined backend
is able to drive inputs/outputs at a rate of ~250hz = ~4
updates per frame. This results in an average input latency
of ~4 ms which is as good as it can get with the p3io
hardware's performance limitations that I measured (see
the 4 ms for the IOCTL mentioned above).

This is more than good enough as as update frequency of
the 573 hardware is slightly less than that (I got told
something ~180 hz?).

tl;dr: Gameplay on MAME is great, smooth frame rate, IO feels
amazing and responsive.
This commit is contained in:
icex2
2023-10-08 15:03:53 +02:00
committed by icex2
parent 82343d8cf1
commit 9b2ed6910e
4 changed files with 291 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
Module.mk
View File

@@ -104,6 +104,7 @@ include src/main/d3d9exhook/Module.mk
include src/main/ddrhook-util/Module.mk
include src/main/ddrhook1/Module.mk
include src/main/ddrhook2/Module.mk
include src/main/ddrio-async/Module.mk
include src/main/ddrio-p3io/Module.mk
include src/main/ddrio-mm/Module.mk
include src/main/ddrio-smx/Module.mk
@@ -730,6 +731,7 @@ $(zipdir)/ddr-16-x64.zip: \
$(V)zip -j $@ $^
$(zipdir)/ddr-hwio-x86.zip: \
build/bin/indep-32/ddrio-async.dll \
build/bin/indep-32/ddrio-p3io.dll \
build/bin/indep-32/ddrio-mm.dll \
build/bin/indep-32/ddrio-smx.dll \
@@ -741,6 +743,7 @@ $(zipdir)/ddr-hwio-x86.zip: \
$(V)zip -j $@ $^
$(zipdir)/ddr-hwio-x64.zip: \
build/bin/indep-64/ddrio-async.dll \
build/bin/indep-64/ddrio-p3io.dll \
build/bin/indep-64/ddrio-mm.dll \
build/bin/indep-64/ddrio-smx.dll \