REDCODE/spice2x-r3d
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

gitadora: option to disable frame limiter (#848)

Browse Source 
## Link to GitHub Issue or related Pull Request, if one exists
n/a

## Description of change
There is a patch for GITADORA series that fixes frame pacing on modern
Windows. Turn it into a signature patch and embed it into the game.

## Testing
should work for all 64-bit gitadora versions, pre-GWD
This commit is contained in:
bicarus
2026-08-02 03:35:07 -07:00
committed by GitHub
parent e7822aad8e
commit 1ec7528dac
5 changed files with 65 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/spice2x/games/gitadora/gitadora.cpp
+47
View File
@@ -31,6 +31,7 @@ namespace games::gitadora {
// settings
bool TWOCHANNEL = false;
bool DISABLE_FRAME_LIMITER = false;
std::optional<unsigned int> CAB_TYPE = std::nullopt;
bool P1_LEFTY = false;
bool P2_LEFTY = false;
@@ -65,6 +66,46 @@ namespace games::gitadora {
return CreateDirectoryA(lpPathName, lpSecurityAttributes);
}
// libshare-pj paces mainloop with separate 12 ms and 16 ms waits. these waits
// interfere with the game's normal display synchronization on modern Windows
// and can hold a nominal 60 FPS game near 58 FPS. locate the instruction
// sequences at runtime so the fix does not depend on per-version file offsets.
static void disable_mainloop_frame_limiter(HMODULE sharepj_module) {
if (!sharepj_module) {
return;
}
// both limiters have the same shape, only the millisecond target xx differs
// (0Ch for the 12 ms limiter, 10h for the 16 ms one):
//
// 48 83 F8 xx: cmp rax, xx; compare elapsed frame time with the target
// 73 10: jae +10h; skip the wait once the target has elapsed
// B9 xx 00 00 00: mov ecx, xx; load the target
// 48 2B C8: sub rcx, rax; calculate the remaining wait time
// 74 06: je +6h; skip the following six-byte Sleep call if no wait remains
//
// changing jae (73h) to jmp (EBh) makes each block always take its existing
// skip path, which bypasses only the associated Sleep call and leaves the 10h
// branch displacement and every other wait untouched.
const auto limiter_12ms_disabled = replace_pattern(
sharepj_module,
"4883F80C7310B90C000000482BC87406",
"????????EB??????????????????????", 0, 0);
const auto limiter_16ms_disabled = replace_pattern(
sharepj_module,
"4883F8107310B910000000482BC87406",
"????????EB??????????????????????", 0, 0);
if (!limiter_12ms_disabled || !limiter_16ms_disabled) {
log_fatal(
"gitadora",
"failed to disable libshare-pj mainloop frame limiter (-gdnoframelimiter), ensure patch is not already applied");
return;
}
log_info("gitadora", "successfully disabled libshare-pj mainloop frame limiter (-gdnoframelimiter)");
}
#endif
/*
@@ -687,6 +728,12 @@ namespace games::gitadora {
HMODULE system_module = libutils::try_module("libsystem.dll");
// patches
#ifdef SPICE64
if (DISABLE_FRAME_LIMITER && !is_arena_model()) {
disable_mainloop_frame_limiter(sharepj_module);
}
#endif
detour::inline_hook((void *) eam_network_detected_ip_change, libutils::try_proc(
sharepj_module, "eam_network_detected_ip_change"));
detour::inline_hook((void *) eam_network_settings_conflict, libutils::try_proc(