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vulkan: skip native draws without a depth target only while many pipelines are pending - #971
With EDEN_NX2_ASYNC_DISCARD=1, a native draw with an unbuilt pipeline is
skipped. A draw that runs only once, such as menu text rendered to a texture,
is then never drawn again. Draws into a depth target are still skipped, as they
come back on the next frame. Other draws now wait, unless at least EDEN_NX2_ASYNC_DISCARD_MIN_PENDING pipelines (default 32) are pending.
Only affects the opt-in EDEN_NX2_ASYNC_DISCARD path.
Testing
Ocarina of Time (0400486024DEC000), RTX 5090, driver 620.70, Ryzen 9 9950X3D,
Fedora 44, Linux 7.2. Boot to the title menu with an empty shader cache and EDEN_NX2_ASYNC_DISCARD=1, one run each, about 3 minutes.
nx2 cbb512ee7a: title menu text broken, 11 draws skipped.
With this change: title menu text shown, 0 draws skipped, 20.8 ms of draws
held in total.
Summary by CodeRabbit
Performance
Asynchronous pipeline handling waits for builds by default, skipping draws only when a depth target is present or pending builds reach the configured threshold. The threshold defaults to 32 and can be set with EDEN_NX2_ASYNC_DISCARD_MIN_PENDING.
Documentation
Updated the setting guidance to explain when asynchronous draw skipping occurs and how the pending-build threshold affects draws without a depth target.
…lines are pending
A skipped draw that runs once, such as text rendered to a texture, is never drawn again. Under EDEN_NX2_ASYNC_DISCARD, draws into a depth target are still skipped, others wait unless at least EDEN_NX2_ASYNC_DISCARD_MIN_PENDING pipelines (32) are pending.
No actionable comments were generated in the recent review.
Walkthrough
GraphicsPipeline now tracks pending worker-only builds. When native-draw discard is enabled, PipelineCache uses the pending-build count, a configurable threshold, and depth-target state to choose whether to skip or wait.
GraphicsPipeline adds a static accessor and atomic counter. It increments the counter when queuing a worker-only build and decrements it when the build task exits.
BuiltPipeline reads EDEN_NX2_ASYNC_DISCARD_MIN_PENDING, with a default of 32. With native-draw discard enabled, it selects Skip when a depth target is enabled or the pending count reaches the threshold; otherwise, it selects Wait. The policy documentation and setting tooltip describe these conditions.
zortos293/Lichii issue 276: Describes native draws being held while pipelines are unbuilt, which concerns the skip-or-wait policy changed here.
zortos293/Lichii issue 697: Proposes a setting to discard native draws waiting on unbuilt pipelines, the same behavior area changed here.
zortos293/Lichii issue 905: Describes the behavior of EDEN_NX2_ASYNC_DISCARD=1, which this change modifies.
zortos293/Lichii issue 623: Describes stalls from holding draws for unbuilt pipelines, a behavior governed by the changed policy.
Possibly related PRs
zortos293/Lichii#465: Changes the same BuiltPipeline native-draw skip-or-wait decision and defines the setting that the environment-variable override takes precedence over.
Suggested reviewers:mariomatheuspombal, zortos293
Merge Risk: Minimal · up to 7e567
The threshold still does not apply when depth is enabled with a zero address, but that case was already skipped. No newly introduced merge-blocking risk was established.
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The title is related to the main change. The PR limits skipping of native draws without a depth target to cases where many pipelines are pending. The raw summary and objectives both describe this beha…
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Docstring coverage is 83.33% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentati…
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Explanation
The title is related to the main change. The PR limits skipping of native draws without a depth target to cases where many pipelines are pending. The raw summary and objectives both describe this behavior: draws into a depth target stay skippable, and the threshold comes from EDEN_NX2_ASYNC_DISCARD_MIN_PENDING with a default of 32. The title is 86 characters and 14 words, which is longer than ideal but still specific and readable.
Full details: Docstring Coverage
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Docstring coverage is 83.33% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 6 functions across 5 files.
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Actionable comments posted: 3
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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Inline comments:
Review comments at @src/video_core/renderer_vulkan/vk_graphics_pipeline.cpp:
- Around line 587-589: Update both pending_builds counter operations so every
build queued to a worker is counted and later decremented, including driver
builds; keep worker_only_build unchanged for the wait behavior. Locate the
increment near worker_only_build and the matching decrement in the queued build
task, and use the worker-queue condition consistently for both.
Review comments at @src/video_core/renderer_vulkan/vk_pipeline_cache.cpp:
- Around line 1783-1786: Update the EDEN_NX2_ASYNC_DISCARD settings tooltip,
enablement log, and async_draw_policy.h parameter comment to describe the actual
conditional behavior: depthless native draws with fewer than discard_min_pending
builds pending select Wait, while the branch selects Skip when the threshold is
reached or depth is enabled. Clarify that enabling the setting does not
unconditionally force Skip.
- Around line 1764-1765: Update the EDEN_NX2_ASYNC_DISCARD_MIN_PENDING parsing
logic to use the parse end position and validate that the value fits in u32; use
the default threshold of 32 for empty, nonnumeric, or out-of-range input, while
preserving an explicitly entered 0 as valid.
---
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…reshold
Builds queued without an emission reservation were left out of PendingBuilds(), so the threshold was reached late. An empty or nonnumeric EDEN_NX2_ASYNC_DISCARD_MIN_PENDING parsed as 0 and skipped every draw; it now falls back to 32. The tooltip and log still said the variable forces Skip.
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Nov 9, 2026
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Changes
With
EDEN_NX2_ASYNC_DISCARD=1, a native draw with an unbuilt pipeline isskipped. A draw that runs only once, such as menu text rendered to a texture,
is then never drawn again. Draws into a depth target are still skipped, as they
come back on the next frame. Other draws now wait, unless at least
EDEN_NX2_ASYNC_DISCARD_MIN_PENDINGpipelines (default 32) are pending.Only affects the opt-in
EDEN_NX2_ASYNC_DISCARDpath.Testing
Ocarina of Time (0400486024DEC000), RTX 5090, driver 620.70, Ryzen 9 9950X3D,
Fedora 44, Linux 7.2. Boot to the title menu with an empty shader cache and
EDEN_NX2_ASYNC_DISCARD=1, one run each, about 3 minutes.cbb512ee7a: title menu text broken, 11 draws skipped.held in total.
Summary by CodeRabbit
EDEN_NX2_ASYNC_DISCARD_MIN_PENDING.