# Steam Frame port: progress

## Iteration 1

### Step 1: build fixes, bytecode-only QML (2026-10-07)

**Changes:**
- **`CMakeLists.txt`:**
  - `Core5Compat` removed (unused, not on the Frame).
  - `GuiPrivate` requested explicitly. This is temporary, until step 3 replaces QRhi.
  - `QT_QMLCACHEGEN_ARGUMENTS --only-bytecode`.
  - OpenVR library directory per architecture (`linux64` / `linuxarm64` / `win64`), for
    linking and for the copy next to the binary.
  - `RPATH $ORIGIN`.
  - `libXtst` linked.
- **`overlaycontroller.cpp`:** `d3d11.h` and `case QRhi::D3D11` only under `_WIN32`.
- **Logging:** 8 active easylogging `LOG(INFO)` calls became `qInfo()`
  (`overlaycontroller.cpp` 6, `ChaperoneTabController.cpp` 1,
  `MoveCenterTabController.cpp` 1). Commented-out `LOG` lines are left unchanged.
- Only changed lines are formatted (`git clang-format`).

**Results (x86_64, Arch, Qt 6.11.1, GCC):**
- The build succeeds, with 1463 compiler warnings, as in `qt6`.
- `objdump -T`: 7 `Qt_6_PRIVATE_API` symbols, all `QRhi…` (step 3). The
  `QQmlPrivate::AOTCompiledContext` symbols are gone (bytecode-only QML).
- `libopenvr_api.so` is resolved from the binary's directory (`ldd`).
- Not started: without a running SteamVR the start hangs in OpenVR init (expected; tested
  on the Frame in step 5).

### Step 2: platform option, R7, tick (2026-10-07)

**Changes:**
- **Platform option:**
  - CMake option `OVRAS_STEAM_FRAME` (default OFF) sets the compile definition
    `OVRAS_STEAM_FRAME=1`.
  - New `src/utils/platform_capabilities.h` evaluates it as the only place. It holds
    `k_chaperoneCommitSupported`, `k_defaultVsyncDisabled` and `k_defaultCustomTickRateMs`.
- **Tick (R6):**
  - In "vsync disabled" mode, `m_pumpEventsTimer` runs directly at `customTickRateMs`
    (`applyTickInterval()`, `Qt::PreciseTimer`); the 1 ms counting is gone.
  - Changing the setting restarts the timer.
  - Setting defaults in `settings_controller.h` come from the constants: Frame `true`/11 ms,
    otherwise unchanged `false`/20 ms.
- **R7:** with `!k_chaperoneCommitSupported`:
  - `updateChaperoneResetData()` and `applyChaperoneResetData()` skip
    `CommitWorkingCopy`/`RevertWorkingCopy`. Each logs once per function.
  - The init autosave profile is skipped.

**Results:**
- Both variants (default and `-DOVRAS_STEAM_FRAME=ON`) build on x86_64. The definition is
  only set in the Frame variant (`compile_commands.json`).
- Not tested at runtime yet (Frame, step 5).

**Notes:**
- Another commit at start-up remains, but only on opt-in. `SetWidget()` applies a chaperone
  profile and commits when "auto-apply chaperone" (`autoApplyChaperoneToggle`, default
  `false`) is on. That's a chaperone-profile feature, so it belongs to R5 (iteration 2).
- clang-format reflows comment blocks next to new comments. Separate new comments from
  existing commented-out code with a blank line, otherwise the diff grows.

### Step 3: rendering through public API, `--graphics-api`, mouse y, shutdown order (2026-10-07)

**Changes:**
- **`src/render/`** (new): `RenderBackend`, `OpenGLRenderBackend`, `VulkanRenderBackend` from
  the template (`4a5b090`).
  - Changes to the template code: `VRDASH_*` → `OVRAS_*` names, origin note in the file
    header, references to `OverlayController`.
  - Formatted completely in OVRAS style.
  - One comment in `VulkanRenderBackend.h` was wrapped by hand, because the automatic
    wrapping had broken its column layout.
- **`OverlayController`:**
  - QRhi block replaced by `configureWindow` → `renderControl.initialize` →
    `attachWindow` → `createRenderTarget`.
  - `renderOverlay()` wraps the frame in `beginFrame`/`finishFrame`. It submits
    `vrTextureBounds` + `vrTexture` while the context is current.
  - `SetOverlayFromQRhiTexture`, the QRhi members and `QVulkanInstance` are removed.
  - Render delay 5 → 16 ms (about 60 fps).
- **Shutdown:** `Shutdown()` runs only once. It calls `VR_Shutdown()`, then frees the
  backend's render target (`releaseRenderTarget`, `detachWindow`).
- **Mouse y:** always flipped; the Linux un-flip and its TODO are removed.
- **`openvr_init::renderInterop()`:** Vulkan extensions and HMD GPU from SteamVR.
- **`main.cpp`:** parses `--graphics-api`, then `createRenderBackend` → `initialize` →
  `QQuickWindow::setGraphicsApi` → `OverlayController`.
- **`setup.*`:** `--graphics-api opengl|vulkan` (default `opengl`). Unknown or not built in
  → error, exit code `GENERAL_FAILURE`.
- **CMake:**
  - `GuiPrivate` is gone.
  - The Vulkan backend is built when `QT_FEATURE_vulkan` is set (`OVRAS_HAS_VULKAN`).

**Results (x86_64, Qt 6.11.1):**
- The build succeeds. The Vulkan backend is built in.
- `objdump -T`: only `QVulkanDeviceFunctions::*` / `QVulkanFunctions::*` remain as
  `Qt_6_PRIVATE_API`. Acceptance criterion R1 (symbols) is met.
- Warnings 1463 → 1630. The new code itself has none; the additional ones come from
  `openvr.h` in the three new translation units.
- **Not tested yet:**
  - running both backends, Vulkan validation, the snapshot test (step 5, with the
    containers)
  - mouse direction (Frame)

**Risk:**
- `MyTextField` opens the SteamVR keyboard on `activeFocus`. The template had to send the
  offscreen window an explicit `FocusIn`, otherwise `activeFocusItem` stayed null. The `qt6`
  branch doesn't send it. If text fields don't respond on the Frame, that is the cause (R4).