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Use display scaling to improve performance on slow GPUs

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This dramatically improves performance for lower resolution
streams on slow GPUs when using the GL and Vulkan renderers.
This commit is contained in:
Cameron Gutman
2025-12-30 15:00:47 -06:00
parent f3f1d56e8d
commit ceef792f04
4 changed files with 46 additions and 12 deletions
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36
app/streaming/session.cpp
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@@ -904,6 +904,13 @@ bool Session::initialize(QQuickWindow* qtWindow)
switch (m_Preferences->windowMode)
{
default:
// Normally we'd default to fullscreen desktop when starting in windowed
// mode, but in the case of a slow GPU, we want to use real fullscreen
// to allow the display to assist with the video scaling work.
if (WMUtils::isGpuSlow()) {
m_FullScreenFlag = SDL_WINDOW_FULLSCREEN;
break;
}
case StreamingPreferences::WM_FULLSCREEN_DESKTOP:
// Only use full-screen desktop mode if we're running a desktop environment
if (WMUtils::isRunningDesktopEnvironment()) {
@@ -1422,19 +1429,28 @@ void Session::updateOptimalWindowDisplayMode()
return;
}
// Start with the native desktop resolution and try to find
// the highest refresh rate that our stream FPS evenly divides.
// On devices with slow GPUs, we will try to match the display mode
// to the video stream to offload the scaling work to the display.
bool matchVideo;
if (!Utils::getEnvironmentVariableOverride("MATCH_DISPLAY_MODE_TO_VIDEO", &matchVideo)) {
matchVideo = WMUtils::isGpuSlow();
}
bestMode = desktopMode;
bestMode.refresh_rate = 0;
for (int i = 0; i < SDL_GetNumDisplayModes(displayIndex); i++) {
if (SDL_GetDisplayMode(displayIndex, i, &mode) == 0) {
if (mode.w == desktopMode.w && mode.h == desktopMode.h &&
if (!matchVideo) {
// Start with the native desktop resolution and try to find
// the highest refresh rate that our stream FPS evenly divides.
for (int i = 0; i < SDL_GetNumDisplayModes(displayIndex); i++) {
if (SDL_GetDisplayMode(displayIndex, i, &mode) == 0) {
if (mode.w == desktopMode.w && mode.h == desktopMode.h &&
mode.refresh_rate % m_StreamConfig.fps == 0) {
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"Found display mode with desktop resolution: %dx%dx%d",
mode.w, mode.h, mode.refresh_rate);
if (mode.refresh_rate > bestMode.refresh_rate) {
bestMode = mode;
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"Found display mode with desktop resolution: %dx%dx%d",
mode.w, mode.h, mode.refresh_rate);
if (mode.refresh_rate > bestMode.refresh_rate) {
bestMode = mode;
}
}
}
}