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feat(game): export static Vulkan readback

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Valentin Popov
2026-07-18 18:38:10 +04:00
parent 99a6caf06a
commit 17df86f0f3
2 changed files with 94 additions and 4 deletions
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docs/tomes/05-render.md
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@@ -1498,6 +1498,15 @@ errors. This validates the offline handoff for one captured instant; it does
not claim live camera tracking, material parity, or an original-frame pixel
comparison.
For visual regression work, `fparkan-game --backend static-vulkan` also accepts
`--readback-out <path>`. It writes the final synchronized Vulkan readback bytes
only after the renderer has completed its normal teardown evidence; the JSON
report records the raw Vulkan format, byte count, hash, and requested path. A
three-frame diagnostic AutoDemo run wrote 7,372,800 bytes at format `50`
(`VK_FORMAT_B8G8R8A8_UNORM`) with the same frame hash reported by the renderer.
The artifact is a Vulkan-side comparison input, not an asserted original-frame
image.
The first bounded launch showed that repeated fingerprinting, rather than
Vulkan initialization, was the load-path bottleneck: each new MAT0/TEXM request
re-opened an already decoded archive and re-hashed its entire source file.