forked from mirrors/0ad
trompetin17
256dff7fd4
Goal
----
Avoid corrupting the dynamic font-atlas on Vulkan by blocking any
re-uploads until the command buffer that created / last updated the
texture has actually been submitted.
What changed
------------
* **Queue-aware textures**
* Added `queueSubmitAware` flag to `IDevice::CreateTexture*` APIs.
* `Vulkan::CTexture` now stores two booleans:
- `m_QueueSubmitAware` – opt-in per texture.
- `m_PendingQueueSubmit` – set to *true* the moment an upload
is recorded, cleared once the submit scheduler has flushed.
* `CRingCommandContext::ScheduleUpload` marks the texture as
pending (`SetPendingQueueSubmit(true)`).
* **Device-side watcher**
* `Vulkan::CDevice` keeps a
`m_TextureUploadWatcherQueue`. Each frame it checks textures that
were uploaded ≥ `NUMBER_OF_FRAMES_IN_FLIGHT` frames ago and
clears their pending flag.
* New helpers
`ScheduleTextureUploadWatch `,
`ProcessTextureUploadWatchQueue()`.
* **Font code**
* Atlas texture is now created with
`queueSubmitAware = true`.
* `CFont::UploadTextureAtlasToGPU()` early-outs when
`IsPendingQueueSubmit()` returns *true*, instead of tracking a
submit-handle or the manual `m_IsLoadingTextureToGPU` flag
(removed).
Why this is better
------------------
The logic to wait for a flush is localised inside the rendering
backend, so `CFont` only needs to ask *“is my texture busy?”*.
This removes the fragile submit-handle bookkeeping and works even if
the scheduler issues multiple submits per frame in future.
Result
------
Atlas uploads are deferred until the previous submit completes,
eliminating the intermittent glyph corruption on the Vulkan backend
while leaving GL and the dummy backend unchanged.