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misc: various performance clean up (#844)

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

## Description of change

- Replace unnecessary precision timers with standard sleeps to reduce
wakeups and background CPU usage.
- Reuse buffers in raw input, touchscreen, and HID output paths to
eliminate steady-state allocations.
- Pre-index HID button groups and correctly process batched HID reports.

No functional changes.

## Testing
This commit is contained in:
bicarus
2026-07-28 21:05:32 -07:00
committed by GitHub
parent 7ccd938f9b
commit 5cabd026ae
10 changed files with 139 additions and 106 deletions
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src/spice2x/rawinput/touch.cpp
+14 -5
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@@ -319,7 +319,8 @@ namespace rawinput::touch {
}
// iterate all input data and get touch points
std::vector<HIDTouchPoint> touch_points;
thread_local std::vector<HIDTouchPoint> touch_points;
touch_points.clear();
touch_points.reserve(touch.elements_x.size());
for (size_t i = 0; i < touch.elements_x.size(); i++) {
@@ -424,9 +425,15 @@ namespace rawinput::touch {
}
// process touch points
std::vector<DWORD> touch_removes;
std::vector<TouchPoint> touch_writes;
std::vector<DWORD> touch_modifications;
thread_local std::vector<DWORD> touch_removes;
thread_local std::vector<TouchPoint> touch_writes;
thread_local std::vector<DWORD> touch_modifications;
touch_removes.clear();
touch_writes.clear();
touch_modifications.clear();
touch_removes.reserve(touch.touch_points.size() + touch_points.size());
touch_writes.reserve(touch_points.size());
touch_modifications.reserve(touch_points.size());
// drop every touch point with the given id (marking it as released)
auto remove_touch_point = [&] (DWORD id) {
@@ -581,7 +588,9 @@ namespace rawinput::touch {
auto deadline = get_system_milliseconds() - 50;
// check touch points
std::vector<DWORD> touch_removes;
thread_local std::vector<DWORD> touch_removes;
touch_removes.clear();
touch_removes.reserve(touch.touch_points.size());
auto touch_it = touch.touch_points.begin();
while (touch_it != touch.touch_points.end()) {
auto &hid_tp = *touch_it;