feat(videoout): use native Wayland on Linux

.github/workflows/build.yml

@@ -244,8 +244,8 @@ jobs:
           key: linux
           save: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
           evict-old-files: job
-      - name: Install lavapipe and the SDL audio and XRandR development files
-        run: sudo apt-get update && sudo apt-get install -y --no-install-recommends libvulkan1 mesa-vulkan-drivers libpipewire-0.3-dev libpulse-dev libasound2-dev libxrandr-dev
+      - name: Install lavapipe and the SDL audio, XRandR and Wayland development files
+        run: sudo apt-get update && sudo apt-get install -y --no-install-recommends libvulkan1 mesa-vulkan-drivers libpipewire-0.3-dev libpulse-dev libasound2-dev libxrandr-dev libwayland-dev libxkbcommon-dev libegl-dev libdecor-0-dev
       - id: mesa
         run: |
           echo "version=$(dpkg-query -W -f='${Version}' mesa-vulkan-drivers)" >> "$GITHUB_OUTPUT"

.github/workflows/release.yml

@@ -62,7 +62,7 @@ jobs:
           save: false
       - name: Install lavapipe for the GPU execution tests and the audio development files
         if: matrix.platform == 'linux'
-        run: sudo apt-get update && sudo apt-get install -y --no-install-recommends libvulkan1 mesa-vulkan-drivers libpipewire-0.3-dev libpulse-dev libasound2-dev libxrandr-dev
+        run: sudo apt-get update && sudo apt-get install -y --no-install-recommends libvulkan1 mesa-vulkan-drivers libpipewire-0.3-dev libpulse-dev libasound2-dev libxrandr-dev libwayland-dev libxkbcommon-dev libegl-dev libdecor-0-dev
       - name: Configure Linux
         if: matrix.platform == 'linux'
         run: cmake -S . -B build $CONFIGURE

CMakeLists.txt

@@ -149,7 +149,7 @@ set(SDL_TEST OFF CACHE BOOL "" FORCE)
 set(SDL_VIDEO ON CACHE BOOL "" FORCE)
 set(SDL_RENDER OFF CACHE BOOL "" FORCE)
 set(SDL_X11 ON CACHE BOOL "" FORCE)
-set(SDL_WAYLAND OFF CACHE BOOL "" FORCE)
+set(SDL_WAYLAND ON CACHE BOOL "" FORCE)
 set(SDL_OPENGL OFF CACHE BOOL "" FORCE)
 set(SDL_OPENGLES OFF CACHE BOOL "" FORCE)
 set(SDL_VULKAN ON CACHE BOOL "" FORCE)

core/libs/prx/libSceVideoOut/src/VideoOutDriver.cpp

@@ -261,6 +261,9 @@ VideoOutDriver::VideoOutDriver() {
     SDL_SetHint(SDL_HINT_WINDOWS_DPI_AWARENESS, "permonitorv2");
 #ifdef _WIN32
     SDL_SetHintWithPriority(SDL_HINT_DIRECTINPUT_ENABLED, "0", SDL_HINT_DEFAULT);
+#endif
+#ifdef __linux__
+    SDL_SetHint(SDL_HINT_VIDEODRIVER, "wayland,x11");
 #endif
     if (SDL_InitSubSystem(SDL_INIT_VIDEO | SDL_INIT_GAMECONTROLLER) < 0) {
         throw std::runtime_error(std::string("SDL_InitSubSystem(VIDEO | GAMECONTROLLER) failed: ") + SDL_GetError());

docs/dev/BUILD.md

@@ -28,7 +28,7 @@ git submodule update --init --recursive
 
 - x86-64, Git, CMake 3.22.1 or newer, Ninja, C++20.
 - Linux display refresh queries require SDL's XRandR support (`libxrandr-dev` on Debian/Ubuntu; `libXrandr-devel` on Fedora). Bundled SDL configuration fails without it. Keep `SDL_X11_XRANDR` enabled.
-- Linux: GCC, G++, binutils. SDL's X11 backend requires X11 and Xext development headers (`libx11-dev` and `libxext-dev` on Debian/Ubuntu). Audio output needs SDL's PipeWire, PulseAudio or ALSA backend, built from their development files (`libpipewire-0.3-dev`, `libpulse-dev` and `libasound2-dev` on Debian/Ubuntu; `pipewire-devel`, `pulseaudio-libs-devel` and `alsa-lib-devel` on Fedora). SDL loads them at run time. Without any of them SDL keeps only its silent dummy and disk drivers, so configuration fails.
+- Linux: GCC, G++, binutils. SDL's X11 backend requires X11 and Xext development headers (`libx11-dev` and `libxext-dev` on Debian/Ubuntu). SDL's Wayland backend requires the Wayland, xkbcommon and EGL development files (`libwayland-dev`, `libxkbcommon-dev` and `libegl-dev` on Debian/Ubuntu; `wayland-devel`, `libxkbcommon-devel` and `mesa-libEGL-devel` on Fedora), and `libdecor-0-dev` (`libdecor-devel`) for window decorations on GNOME. SDL loads both backends at run time and prefers Wayland when `WAYLAND_DISPLAY` is set; `SDL_VIDEODRIVER=x11` selects X11 (XWayland). Titles that bundle their own SDL read `SDL_VIDEODRIVER` too, and some of them fail to start with `x11`. Without the Wayland files configuration still succeeds, and the build uses X11 only. Audio output needs SDL's PipeWire, PulseAudio or ALSA backend, built from their development files (`libpipewire-0.3-dev`, `libpulse-dev` and `libasound2-dev` on Debian/Ubuntu; `pipewire-devel`, `pulseaudio-libs-devel` and `alsa-lib-devel` on Fedora). SDL loads them at run time. Without any of them SDL keeps only its silent dummy and disk drivers, so configuration fails.
 - Fedora: if CMake reports `Could NOT find Threads`, install `glibc-static` and `libstdc++-static` with `sudo dnf install glibc-static libstdc++-static`, then rerun configuration. The project enables static executable linking, and FFmpeg's thread check needs these libraries.
 - Windows: only MinGW-w64 GCC 15.2.0 (WinLibs `x86_64-ucrt-posix-seh`, release `15.2.0posix-14.0.0-ucrt-r7`) is currently supported. Add its `mingw64/bin` directory to `PATH` before configuring.
 - Windows antivirus software can quarantine the executables that the relinker tests create in the temp directory, which fails `optional_plt`, `empty_tls`, `windows_address_space` and `windows_icon`. Set `TEMP` and `TMP` to a directory the scanner excludes before running `ctest`.