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[Windows] Use CCD API to get fractional screen refresh rates. #84246

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merged 1 commit into from
Jan 4, 2024
Merged

[Windows] Use CCD API to get fractional screen refresh rates. #84246

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44 changes: 38 additions & 6 deletions platform/windows/display_server_windows.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -687,6 +687,8 @@ typedef struct {
} EnumRectData;

typedef struct {
Vector<DISPLAYCONFIG_PATH_INFO> paths;
Vector<DISPLAYCONFIG_MODE_INFO> modes;
int count;
int screen;
float rate;
Expand Down Expand Up @@ -738,12 +740,30 @@ static BOOL CALLBACK _MonitorEnumProcRefreshRate(HMONITOR hMonitor, HDC hdcMonit
minfo.cbSize = sizeof(minfo);
GetMonitorInfoW(hMonitor, &minfo);

DEVMODEW dm;
memset(&dm, 0, sizeof(dm));
dm.dmSize = sizeof(dm);
EnumDisplaySettingsW(minfo.szDevice, ENUM_CURRENT_SETTINGS, &dm);
bool found = false;
for (const DISPLAYCONFIG_PATH_INFO &path : data->paths) {
DISPLAYCONFIG_SOURCE_DEVICE_NAME source_name;
memset(&source_name, 0, sizeof(source_name));
source_name.header.type = DISPLAYCONFIG_DEVICE_INFO_GET_SOURCE_NAME;
source_name.header.size = sizeof(source_name);
source_name.header.adapterId = path.sourceInfo.adapterId;
source_name.header.id = path.sourceInfo.id;
if (DisplayConfigGetDeviceInfo(&source_name.header) == ERROR_SUCCESS) {
if (wcscmp(minfo.szDevice, source_name.viewGdiDeviceName) == 0 && path.targetInfo.refreshRate.Numerator != 0 && path.targetInfo.refreshRate.Denominator != 0) {
data->rate = (double)path.targetInfo.refreshRate.Numerator / (double)path.targetInfo.refreshRate.Denominator;
found = true;
break;
}
}
}
if (!found) {
DEVMODEW dm;
memset(&dm, 0, sizeof(dm));
dm.dmSize = sizeof(dm);
EnumDisplaySettingsW(minfo.szDevice, ENUM_CURRENT_SETTINGS, &dm);

data->rate = dm.dmDisplayFrequency;
data->rate = dm.dmDisplayFrequency;
}
}

data->count++;
Expand Down Expand Up @@ -932,7 +952,19 @@ float DisplayServerWindows::screen_get_refresh_rate(int p_screen) const {
_THREAD_SAFE_METHOD_

p_screen = _get_screen_index(p_screen);
EnumRefreshRateData data = { 0, p_screen, SCREEN_REFRESH_RATE_FALLBACK };
EnumRefreshRateData data = { Vector<DISPLAYCONFIG_PATH_INFO>(), Vector<DISPLAYCONFIG_MODE_INFO>(), 0, p_screen, SCREEN_REFRESH_RATE_FALLBACK };

uint32_t path_count = 0;
uint32_t mode_count = 0;
if (GetDisplayConfigBufferSizes(QDC_ONLY_ACTIVE_PATHS, &path_count, &mode_count) == ERROR_SUCCESS) {
data.paths.resize(path_count);
data.modes.resize(mode_count);
if (QueryDisplayConfig(QDC_ONLY_ACTIVE_PATHS, &path_count, data.paths.ptrw(), &mode_count, data.modes.ptrw(), nullptr) != ERROR_SUCCESS) {
data.paths.clear();
data.modes.clear();
}
}

EnumDisplayMonitors(nullptr, nullptr, _MonitorEnumProcRefreshRate, (LPARAM)&data);
return data.rate;
}
Expand Down