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Automatically set SDL_KMSDRM_ATOMIC=0 on older SDL3 versions

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Fixes #1824
This commit is contained in:
Cameron Gutman
2026-04-04 14:13:21 -05:00
parent 78bc2141f6
commit e4c211b987
1 changed files with 28 additions and 0 deletions
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28
app/main.cpp
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@@ -801,6 +801,34 @@ int main(int argc, char *argv[])
"Running with SDL %d.%d.%d",
runtimeVersion.major, runtimeVersion.minor, runtimeVersion.patch);
// If we're running under sdl2-compat, it may tell us the underlying SDL3 version
const char* sdl3Version = SDL_GetHint("SDL3_VERSION");
int sdl3VersionInt = 0;
if (sdl3Version) {
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"SDL3 version: %s",
sdl3Version);
// Parse the version into integer form
QStringList list = QString(sdl3Version).split('.');
Q_ASSERT(list.size() == 3);
if (list.size() == 3) {
sdl3VersionInt = SDL_VERSIONNUM(list.at(0).toInt(), list.at(1).toInt(), list.at(2).toInt());
}
}
// SDL 3.4.0 and 3.4.2 have bugs in atomic KMSDRM support that break us,
// so disable atomic on the affected SDL3 versions. Since not all versions
// of sdl2-compat will set the SDL3_VERSION hint, we assume that versions
// prior to 2.32.66 are affected (since that was released at the same time
// as SDL 3.4.4 with the atomic fixes).
if ((sdl3VersionInt != 0 && sdl3VersionInt < SDL_VERSIONNUM(3, 4, 4)) ||
(runtimeVersion.patch >= 50 && runtimeVersion.patch < 66)) {
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"Setting SDL_KMSDRM_ATOMIC=0 for older sdl2-compat/SDL3 version");
SDL_SetHint("SDL_KMSDRM_ATOMIC", "0");
}
// Apply the initial translation based on user preference
StreamingPreferences::get()->retranslate();