Drop the dead BGFX_CONFIG_MAX_FRAME_BUFFERS=256 overrides and stop clamping the pool - #1837
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…amping The pool floor added in BabylonJS#1715 and raised to 2048 in BabylonJS#1830 clamps any smaller value upward, so the three CI overrides have done nothing since June while reading as deliberate coverage of a 256-slot pool. Removing the flags is what makes the floor safe to relax, so both halves are here: build-win32.yml and nightly.yml run the validation sweep the larger pool exists for, so honoring their =256 would reintroduce the exhaustion BabylonJS#1830 fixed. With the flags gone, 2048 becomes a plain default rather than a floor, and an embedder that deliberately sets a smaller pool is no longer overridden without a diagnostic. build-win32-shader.yml builds only PrecompiledShaderTest, where the value never mattered. Verified by configuring Win32 x64 D3D11 both ways: with no flag bgfx still compiles with BGFX_CONFIG_MAX_FRAME_BUFFERS=2048, and -D ...=256 now reaches the compile line instead of being clamped up to 2048. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: e327caab-46c0-4c04-a3c0-1577ad67f08c
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Pull request overview
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Removes ineffective CI overrides for BGFX_CONFIG_MAX_FRAME_BUFFERS=256 and changes the CMake logic to only apply a default (2048) when the setting is unset (no longer clamping smaller user-provided values upward).
Changes:
- Drop
-D BGFX_CONFIG_MAX_FRAME_BUFFERS=256from the Win32/nightly CI workflows. - Update
Dependencies/CMakeLists.txtto setBGFX_CONFIG_MAX_FRAME_BUFFERSto 2048 only when not provided, removing the previous “floor/clamp” behavior. - Refresh the explanatory comment around why 2048 is the default.
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| nightly.yml | Removes the BGFX_CONFIG_MAX_FRAME_BUFFERS=256 CMake definition from nightly generation. |
| Dependencies/CMakeLists.txt | Stops clamping low values; only supplies a default of 2048 when unset. |
| .github/workflows/build-win32.yml | Removes the ineffective CI override for max frame buffers. |
| .github/workflows/build-win32-shader.yml | Removes the ineffective CI override for max frame buffers in shader workflow. |
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bghgary
enabled auto-merge (squash)
August 14, 2026 21:28
bkaradzic-microsoft
approved these changes
Aug 14, 2026
ryantrem
reviewed
Aug 14, 2026
| # that point and exhausts the pool around the FrameGraph tests, so the floor | ||
| # has to cover a complete uninterrupted run. | ||
| if(NOT BGFX_CONFIG_MAX_FRAME_BUFFERS OR BGFX_CONFIG_MAX_FRAME_BUFFERS LESS 2048) | ||
| # The Canvas polyfill holds a bgfx framebuffer per JS Canvas object and per |
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It sounds like we only need to increase this by default if you are using the canvas polyfill. Should it be conditioned on this?
bkaradzic-microsoft
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Aug 20, 2026
Brings in BabylonJS#1834 (uncaught C++ exception messages), BabylonJS#1837 (drop the dead BGFX_CONFIG_MAX_FRAME_BUFFERS overrides), BabylonJS#1838 (validation sweep keeps going past the first failure), BabylonJS#1841 (bgfx.cmake bump) and BabylonJS#1824 (Canvas2D polyfill correctness fixes). Conflicts: - CMakeLists.txt: keep the shotgun bgfx.cmake fork pointer instead of the upstream pin. - config.json: take upstream for the three GUI Gradient tests, whose exclusions BabylonJS#1824 removed now that the Canvas gradient bugs are fixed. BabylonJS#1838 replaces the shotgun-local --keep-going flag with the inverted --stop-on-first-failure; the C++ and JS sides both take the upstream spelling. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae
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[Created by Copilot on behalf of @bghgary]
Context
The pool floor added in #1715 (512) and raised in #1830 (2048) clamps any smaller value upward, so the three CI workflows passing
-D BGFX_CONFIG_MAX_FRAME_BUFFERS=256have had no effect since June while reading as deliberate coverage of a 256-slot pool.The clamp is also wrong on its own terms: an embedder that deliberately picks a smaller pool is overridden with no diagnostic.
Worth a look
=256take effect and reintroduce the pool exhaustion Playground validation: make a full 720-test sweep possible #1830 fixed, sincebuild-win32.ymlandnightly.ymlrun the validation sweep the larger pool exists for.build-win32-shader.ymlbuilds onlyPrecompiledShaderTest, where the value never mattered.BGFX_CONFIG_setting. It predates Playground validation: make a full 720-test sweep possible #1830 and still carries 512, so its merge from master needs to keep 2048.Verification
Configured Win32 x64 D3D11 both ways: with no flag bgfx still compiles with
BGFX_CONFIG_MAX_FRAME_BUFFERS=2048, so CI is unchanged, and-D BGFX_CONFIG_MAX_FRAME_BUFFERS=256now reaches the compile line instead of being clamped up.