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[Linux] Make the framebuffer depth/stencil buffer optional - #192156
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fl_framebuffer_new() always attached a depth/stencil renderbuffer. That is needed when Impeller renders into a framebuffer, but the framebuffers this makes are now only used to present frames that have already been rendered - the compositor copies into them with glBlitFramebuffer(GL_COLOR_BUFFER_BIT) or by drawing a textured quad, and never enables the depth or stencil test. Add a flag so callers say whether they need one. The framebuffers the engine renders into are made by fl_framebuffer_new_multisample() and still always have one. GL_DEPTH24_STENCIL8 is four bytes per pixel, the same as the colour texture, so not attaching one halves the memory these framebuffers need. They are reallocated on every resize step, so this matters most when resizing or maximizing a window on a large display, where running out of video memory makes eglMakeCurrent fail. See flutter#191775
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This pull request introduces a depth_stencil parameter to fl_framebuffer_new to conditionally allocate depth and stencil renderbuffers, optimizing memory usage for framebuffers that do not require them. The reviewer points out that modifying the ResourcesRemoved test to use depth_stencil = FALSE removes coverage for verifying that depth/stencil renderbuffers are correctly cleaned up when allocated.
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Resolves conflicts with the removal of the FlFramebuffer 'shareable' argument and the EGLImage sibling API.
ResourcesRemoved no longer covered deleting the depth/stencil renderbuffer, since it now makes a framebuffer without one. Make it use a framebuffer with a depth/stencil buffer again and add a companion test that checks no renderbuffer is generated or deleted when one isn't requested.
These checks were accidentally dropped from the multisample tests; they are unrelated to the depth/stencil buffer changes.
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Roll Flutter from 63b9518f16bc to 2553f89be1ef (62 revisions) flutter/flutter@63b9518...2553f89 2026-09-12 chris@bracken.jp Roll clang to 07d67299a15ce03b053736e2d31a668ee0576987 (flutter/flutter#192607) 2026-09-12 engine-flutter-autoroll@skia.org Roll Dart SDK from b24b352c29db to 7863887acbfb (3 revisions) (flutter/flutter#192665) 2026-09-12 codefu@google.com fix(tree): et format --all (flutter/flutter#192669) 2026-09-12 matt.boetger@gmail.com Support activity-alias in Android launcher activity detection (flutter/flutter#187251) 2026-09-12 matt.boetger@gmail.com fix: regenerate gradle lockfiles for external_textures integration test (flutter/flutter#192657) 2026-09-12 engine-flutter-autoroll@skia.org Roll Skia from 51aa02b2c195 to e5e96533b732 (4 revisions) (flutter/flutter#192646) 2026-09-12 Rusino@users.noreply.github.com [WebParagraph] Fix text pixelation, glyph clipping, and snapping offsets to avoid subpixel raster caching (flutter/flutter#191736) 2026-09-12 codefu@google.com fix(tests): Add ruby dep to Mac windowing_test (flutter/flutter#192656) 2026-09-12 116356835+AbdeMohlbi@users.noreply.github.com Remove some `unawaited_futures` outdated ignores (flutter/flutter#192026) 2026-09-11 katelovett@google.com Bump Dart to 3.13, reformat, re-enable formatting check (flutter/flutter#192649) 2026-09-11 34871572+gmackall@users.noreply.github.com [android] Isolate API-34 high contrast listener in AccessibilityBridge behind Api34Impl (flutter/flutter#192502) 2026-09-11 katelovett@google.com Update style guide for Dart 3.13 (flutter/flutter#192639) 2026-09-11 codefu@google.com ci(bringups): remove bringup from these tests (flutter/flutter#192637) 2026-09-11 30870216+gaaclarke@users.noreply.github.com Unmark new_gallery_windows_impeller__transition_perf as bringup (flutter/flutter#192633) 2026-09-11 30870216+gaaclarke@users.noreply.github.com Unmark new_gallery_windows_skia__transition_perf as bringup (flutter/flutter#192635) 2026-09-11 engine-flutter-autoroll@skia.org Roll Skia from f446aec4ce9e to 51aa02b2c195 (2 revisions) (flutter/flutter#192631) 2026-09-11 codefu@google.com fix(ci): mac verify binaries still racing (flutter/flutter#192634) 2026-09-11 engine-flutter-autoroll@skia.org Roll Packages from 8a35b16 to 9caa77c (8 revisions) (flutter/flutter#192630) 2026-09-11 engine-flutter-autoroll@skia.org Roll Dart SDK from a76fee2722e0 to b24b352c29db (2 revisions) (flutter/flutter#192627) 2026-09-11 bkonyi@google.com [tool] Migrate PackagesCommand and Pub to modular dependency injection (flutter/flutter#192460) 2026-09-11 bkonyi@google.com [tool] Migrate Darwin framework commands to modular dependency injection (flutter/flutter#192252) 2026-09-11 bkonyi@google.com [tool] Migrate Upgrade, Downgrade, and UpdatePackages commands to modular dependency injection (flutter/flutter#190787) 2026-09-11 engine-flutter-autoroll@skia.org Roll Skia from b3fa80a0e168 to f446aec4ce9e (55 revisions) (flutter/flutter#192620) 2026-09-11 engine-flutter-autoroll@skia.org Roll Dart SDK from d20d59cfa664 to a76fee2722e0 (2 revisions) (flutter/flutter#192616) 2026-09-11 okorohelijah@google.com remove deeplink integration tests from bringup (flutter/flutter#192459) 2026-09-11 154381524+flutteractionsbot@users.noreply.github.com Revert: [devicelab] Clean up Chrome profile directories and trap abort signals in web benchmarks (flutter/flutter#192615) 2026-09-11 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from C0j8F-_Iy-OQZ6YyI... to m69nfK-wnHaMTe8P9... (flutter/flutter#192608) 2026-09-11 kevmoo@users.noreply.github.com Fix Wasm build cache mismatch in ResidentWebRunner and browser 404 fallbacks (flutter/flutter#190786) 2026-09-11 engine-flutter-autoroll@skia.org Roll Dart SDK from 3ce3116bc9ec to d20d59cfa664 (1 revision) (flutter/flutter#192588) 2026-09-11 robert.ancell@canonical.com [Linux] Keep the frame at the top of a resizing subsurface (flutter/flutter#192408) 2026-09-10 1961493+harryterkelsen@users.noreply.github.com [devicelab] Clean up Chrome profile directories and trap abort signals in web benchmarks (flutter/flutter#192584) 2026-09-10 1961493+harryterkelsen@users.noreply.github.com [web] Keep ImageSource alive until Picture disposal (flutter/flutter#192516) 2026-09-10 jhy03261997@gmail.com Remove the accessibility evaluations feature flag (flutter/flutter#192266) 2026-09-10 97480502+b-luk@users.noreply.github.com Promote Windows gradient benchmark tests to non-bringup (flutter/flutter#192581) 2026-09-10 116356835+AbdeMohlbi@users.noreply.github.com Remove commented out export in `text_input.dart` since the dart compiler has the correct behavior now (flutter/flutter#191539) 2026-09-10 bkonyi@google.com [flutter_tools] Do not mistake server-initiated requests for responses to client requests in AnalysisServer (flutter/flutter#192546) 2026-09-10 engine-flutter-autoroll@skia.org Roll Packages from 36e088a to 8a35b16 (12 revisions) (flutter/flutter#192550) 2026-09-10 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#192517) 2026-09-10 kevmoo@users.noreply.github.com feat(web): support --web-content-hash for entrypoint files (flutter/flutter#190153) 2026-09-10 zhongliu88889@gmail.com [web] Stop iOS auto-zoom by sizing semantic inputs at 16px (flutter/flutter#192328) 2026-09-10 engine-flutter-autoroll@skia.org Roll Dart SDK from 0d55b7a6a9ee to 3ce3116bc9ec (2 revisions) (flutter/flutter#192534) 2026-09-10 116356835+AbdeMohlbi@users.noreply.github.com Update more enum instances comparison to use equality == since dart has the correct behavior now (flutter/flutter#191788) 2026-09-10 bkonyi@google.com Fix specify_nonobvious_local_variable_types lints in luci_resultdb_test.dart (flutter/flutter#192543) 2026-09-10 engine-flutter-autoroll@skia.org Roll ICU from 8cc91d9b6ab9 to 6ebb40c59477 (1 revision) (flutter/flutter#192527) 2026-09-10 robert.ancell@canonical.com [Linux] Make the framebuffer depth/stencil buffer optional (flutter/flutter#192156) 2026-09-10 robert.ancell@canonical.com [Linux] Cancel input when events stop being delivered (flutter/flutter#192277) ...
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fl_framebuffer_new() always attached a depth/stencil renderbuffer. That is needed when Impeller renders into a framebuffer, but the framebuffers this makes are now only used to present frames that have already been rendered - the compositor copies into them with
glBlitFramebuffer(GL_COLOR_BUFFER_BIT) or by drawing a textured quad, and never enables the depth or stencil test.
Add a flag so callers say whether they need one. The framebuffers the engine renders into are made by fl_framebuffer_new_multisample() and still always have one.
GL_DEPTH24_STENCIL8 is four bytes per pixel, the same as the colour texture, so not attaching one halves the memory these framebuffers need. They are reallocated on every resize step, so this matters most when resizing or maximizing a window on a large display, where running out of video memory makes eglMakeCurrent fail.
See #191775