Default wrapper backend to Vulkan runtime across platforms

README.md

@@ -209,8 +209,8 @@ make -j$(nproc)
     - `wowee_fsr3_vk_wrapper` now builds automatically when FSR3 SDK headers are present and outputs to `build/bin/libffx_fsr3_vk_wrapper.*`.
     - Wrapper backend override (what the wrapper loads underneath): `WOWEE_FSR3_WRAPPER_BACKEND_LIB=/absolute/path/to/libffx_fsr3_vk.so`.
     - Wrapper backend mode:
-      - `WOWEE_FSR3_WRAPPER_BACKEND=vulkan_runtime` (default on non-Windows)
-      - `WOWEE_FSR3_WRAPPER_BACKEND=dx12_bridge` (default on Windows; bridge dispatch wiring still in progress)
+      - `WOWEE_FSR3_WRAPPER_BACKEND=vulkan_runtime` (default on all platforms)
+      - `WOWEE_FSR3_WRAPPER_BACKEND=dx12_bridge` (opt-in; bridge dispatch wiring still in progress)
     - DX12 runtime override (for `dx12_bridge`):
       - `WOWEE_FSR3_DX12_RUNTIME_LIB=C:\\path\\to\\amd_fidelityfx_framegeneration_dx12.dll`
     - DX12 device validation probe (default on):

docs/AMD_FSR2_INTEGRATION.md

@@ -55,6 +55,7 @@ Runtime note:
 - Wrapper backend mode selection:
   - `WOWEE_FSR3_WRAPPER_BACKEND=vulkan_runtime`
   - `WOWEE_FSR3_WRAPPER_BACKEND=dx12_bridge`
+- Default is `vulkan_runtime` on all platforms. `dx12_bridge` is opt-in while Vulkan<->DX12 interop dispatch is still in progress.
 - DX12 bridge runtime override:
   - `WOWEE_FSR3_DX12_RUNTIME_LIB=<path-to-amd_fidelityfx_framegeneration_dx12.dll>`
 - DX12 bridge device preflight toggle:

src/rendering/amd_fsr3_wrapper_impl.cpp

@@ -110,11 +110,7 @@ WrapperBackend selectBackend() {
             }
         }
     }
-#if defined(_WIN32)
-    return WrapperBackend::Dx12Bridge;
-#else
     return WrapperBackend::VulkanRuntime;
-#endif
 }
 
 FfxErrorCode vkSwapchainConfigureNoop(const FfxFrameGenerationConfig*) {