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77 lines
3.1 KiB
Markdown
77 lines
3.1 KiB
Markdown
# AMD FSR2 Integration Notes
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WoWee supports two FSR2 backends at runtime:
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- `AMD FidelityFX SDK` backend (preferred when available).
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- `Internal fallback` backend (used when AMD SDK prerequisites are not met).
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## SDK Location
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AMD SDK checkout path:
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`extern/FidelityFX-FSR2`
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FidelityFX SDK checkout path (framegen extern):
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`extern/FidelityFX-SDK` (pinned to `v1.1.4` in build scripts and CI)
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Detection expects:
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- `extern/FidelityFX-FSR2/src/ffx-fsr2-api/ffx_fsr2.h`
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- `extern/FidelityFX-FSR2/src/ffx-fsr2-api/vk/shaders/ffx_fsr2_accumulate_pass_permutations.h`
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- If permutation headers are missing in the SDK checkout, WoWee CMake copies a vendored snapshot from:
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- `third_party/fsr2_vk_permutations`
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## Build Flags
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- `WOWEE_ENABLE_AMD_FSR2=ON` (default): attempt AMD backend integration.
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- `WOWEE_ENABLE_AMD_FSR3_FRAMEGEN=ON` (default): build AMD FSR3 framegen interface probe when FidelityFX-SDK headers are present.
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- `WOWEE_HAS_AMD_FSR2` compile define:
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- `1` when AMD SDK prerequisites are present.
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- `0` when missing, in which case internal fallback remains active.
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- `WOWEE_HAS_AMD_FSR3_FRAMEGEN` compile define:
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- `1` when FidelityFX-SDK FI/OF/FSR3+VK headers are detected.
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- `0` when headers are missing (probe target disabled).
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Runtime note:
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- Renderer/UI now expose a persisted experimental framegen toggle.
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- Runtime loader now probes for AMD FSR3 SDK runtime binaries.
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- You can point to an explicit runtime binary with:
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- `WOWEE_FFX_SDK_RUNTIME_LIB=/absolute/path/to/libffx_fsr3_vk.so` (or `.dll` / `.dylib`).
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- Current runtime status is still `dispatch staged` (FI/OF dispatch activation pending).
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## Current Status
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- AMD FSR2 Vulkan dispatch path is integrated and used when available.
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- UI displays active backend in settings (`AMD FidelityFX SDK` or `Internal fallback`).
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- Runtime settings include persisted FSR2 jitter tuning.
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- FidelityFX-SDK `v1.1.4` extern is fetched across platforms and validated in Linux CI for Vulkan framegen source presence.
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- Startup safety behavior remains enabled:
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- persisted FSR2 is deferred until `IN_WORLD`
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- startup falls back unless `WOWEE_ALLOW_STARTUP_FSR2=1`
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## FSR Defaults
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- Quality default: `Native (100%)`
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- UI quality order: `Native`, `Ultra Quality`, `Quality`, `Balanced`
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- Default sharpness: `1.6`
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- Default FSR2 jitter sign: `0.38`
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- Performance preset is intentionally removed.
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## CI Notes
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- `build-linux-amd-fsr2` clones AMD's repository and configures with `WOWEE_ENABLE_AMD_FSR2=ON`.
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- All build jobs clone:
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- `GPUOpen-Effects/FidelityFX-FSR2` (`master`)
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- `GPUOpen-LibrariesAndSDKs/FidelityFX-SDK` (`v1.1.4`)
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- Linux CI additionally checks FidelityFX-SDK Vulkan framegen files:
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- `ffx_frameinterpolation_callbacks_glsl.h`
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- `ffx_opticalflow_callbacks_glsl.h`
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- `CMakeShadersFrameinterpolation.txt`
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- `CMakeShadersOpticalflow.txt`
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- All CI platform jobs build:
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- `wowee_fsr3_framegen_amd_vk_probe`
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- Some upstream SDK checkouts do not include generated Vulkan permutation headers.
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- WoWee bootstraps those headers from the vendored snapshot so AMD backend builds remain cross-platform and deterministic.
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- If SDK headers are missing entirely, WoWee still falls back to the internal backend.
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