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perf(rendering): preserve alpha order with bindless particles

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Carry each billboard particle's resident texture handle in the instance ABI so stable retail alpha ordering can batch mixed textures without rebinding and redrawing each short texture run. Keep DAT blend transitions as the only billboard draw boundary.

The connected 0xC95B stress scene improved from 6 FPS / 171 ms to about 153 FPS / 6.6 ms at the same roughly 21,000 visible entities. Release build succeeds and all 5,916 tests pass with five intentional skips.

Co-authored-by: OpenAI Codex <codex@openai.com>
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Erik 2026-07-18 08:32:21 +02:00
parent 6b0472ee32
commit 2cbf34a668
7 changed files with 150 additions and 57 deletions
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docs/ISSUES.md
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@ -68,9 +68,22 @@ flush boundaries. It preserves DAT blend/cull/lighting state and batches only
adjacent compatible submissions so renderer grouping cannot change the
compositing order.
The first connected build exposed a modern-backend performance regression:
distance sorting naturally interleaves particle textures, while the old
billboard shader required one texture bind/draw for every texture run. After
several portals, the dense `0xC95B` scene reached roughly 21,000 visible
entities and fell to 6 FPS / 171 ms. This was not a retained queue or streaming
leak. Billboard instances now carry their resident bindless texture handle in
the vertex-instance ABI; different textures therefore remain in exact sorted
order inside one instanced draw, with only DAT blend-mode changes splitting a
run. The identical location recovered to about 153 FPS / 6.6 ms in the
connected Release client.
**Files:** `src/AcDream.App/Rendering/RetailAlphaQueue.cs`;
`src/AcDream.App/Rendering/Wb/WbDrawDispatcher.cs`;
`src/AcDream.App/Rendering/ParticleRenderer.cs`;
`src/AcDream.App/Rendering/Shaders/particle.vert`;
`src/AcDream.App/Rendering/Shaders/particle.frag`;
`src/AcDream.App/Rendering/RetailPViewRenderer.cs`.
**Research:**