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https://github.com/Droid-Deck/DroidDeck.git
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Thomas Lee
4922d309c8
The flow solver starts at flowFinest_, but its images, uniform buffers and descriptor sets were allocated for every pyramid level. Keep the seven-level indices and allocate flow resources only where the solver reads and writes them. The default preset avoids three unused RGBA16F images, saving 38,707,200 bytes of pixel payload at 2560x1440 without changing the shaders or recorded GPU work. Add native allocation/dispatch regressions and document the resource budgets.
39 lines
1.6 KiB
Markdown
39 lines
1.6 KiB
Markdown
# DD-FG flow resources
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DD-FG keeps seven luminance pyramid levels for both input frames. Its performance
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preset chooses the finest level at which optical flow is solved:
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| Preset | Finest solved level | Allocated flow levels |
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|---|---:|---|
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| 0 | 1 | 1 through 6 |
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| 1 | 2 | 2 through 6 |
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| 2 (the app default) | 3 | 3 through 6 |
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Only those solved levels need RGBA16F flow images, flow UBOs and flow descriptor
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sets. The vectors keep their original level indices; unused entries are null.
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The full luminance pyramids, full-resolution expanded flow images, regularization
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and synthesis are unchanged.
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At the default preset this avoids three flow images, three uniform buffers and
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three descriptor sets. The removed image payload is
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`8 * (width * height + (width >> 1) * (height >> 1) + (width >> 2) * (height >> 2))`
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bytes for dimensions at least four pixels:
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| Input size | Removed image payload |
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|---|---:|
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| 1280 x 720 | 9,676,800 bytes |
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| 1920 x 1080 | 21,772,800 bytes |
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| 2560 x 1440 | 38,707,200 bytes |
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These are pixel payloads, not driver allocation sizes or measured FPS gains.
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## Validation
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Run `python3 -m unittest discover -s tools/tests -p 'test_ddfg_flow_levels.py'`.
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The host test needs a C++17 compiler and system Vulkan headers or an Android NDK
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selected through the usual SDK/NDK environment variables. It compiles the actual
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DD-FG chain against a mock Vulkan dispatch table and checks resource counts,
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dispatch order and sizes, valid descriptor bindings, both models, every preset,
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2x/3x/4x generation, small/odd extents, resize and live preset changes.
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It does not execute shaders on a GPU or replace on-device validation.
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