Remove 10 ms sleep hidden inside SDL_WaitEvent(). This fixes mouse polling rate being capped at 100 Hz (1 second / 10 ms) and the rendering FPS being capped at 90 FPS.

README.md

@@ -13,7 +13,7 @@ You can follow development on our [Discord server](https://discord.gg/6ERtzFY).
 
 ## Features
  - Hardware accelerated video decoding on Windows, Mac, and Linux
- - Supports streaming at up to 90 FPS on high refresh rate monitors
+ - Supports streaming at up to 120 FPS on high refresh rate monitors
  - Supports streaming at 720p, 1080p, 1440p, or 4K
  - 5.1 surround sound audio
  - HEVC support for better image quality at reduced bandwidth

app/settings/streamingpreferences.cpp

@@ -82,9 +82,9 @@ int StreamingPreferences::getMaximumStreamingFrameRate()
     for (int i = 0; i < SDL_GetNumVideoDisplays(); i++) {
         SDL_DisplayMode mode;
         if (SDL_GetCurrentDisplayMode(i, &mode) == 0) {
-            // Cap the frame rate at 90 FPS, since I can't seem to get
-            // much more out of GFE even with the game rendering at > 300 FPS.
-            maxFrameRate = qMax(maxFrameRate, qMin(90, mode.refresh_rate));
+            // Cap the frame rate at 120 FPS. Past this, the encoders start
+            // to max out and drop frames.
+            maxFrameRate = qMax(maxFrameRate, qMin(120, mode.refresh_rate));
         }
     }
 

app/streaming/session.cpp

@@ -667,7 +667,15 @@ void Session::exec()
     // Hijack this thread to be the SDL main thread. We have to do this
     // because we want to suspend all Qt processing until the stream is over.
     SDL_Event event;
-    while (SDL_WaitEvent(&event)) {
+    for (;;) {
+        // We explicitly use SDL_PollEvent() and SDL_Delay() because
+        // SDL_WaitEvent() has an internal SDL_Delay(10) inside which
+        // blocks this thread too long for high polling rate mice and high
+        // refresh rate displays.
+        if (!SDL_PollEvent(&event)) {
+            SDL_Delay(1);
+            continue;
+        }
         switch (event.type) {
         case SDL_QUIT:
             SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,