`glDiscardFramebufferEXT` called with incorrect parameters when a non-default framebuffer is bound

[planetmarshall]

Steps to reproduce

1. Run flutter run ... --enable-impeller on a platform with support for glDiscardFramebufferEXT

Expected results

The application runs successfully

Actual results

The following error is reported

[FATAL:flutter/impeller/renderer/backend/gles/proc_table_gles.h(43)] Fatal GL Error GL_INVALID_ENUM(1280) encountered on call to glDiscardFramebufferEXT

Code sample

Any trivial sample will suffice

Screenshots or Video

Screenshots / Video demonstration

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Logs

Logs

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Flutter Doctor output

Doctor output

[!] Flutter (Channel [user-branch], 3.37.0-1.0.pre-158, on Arch Linux 6.16.7-arch1-1, locale en_GB.UTF-8) [34ms]
    ! Flutter version 3.37.0-1.0.pre-158 on channel [user-branch] at ...
      Currently on an unknown channel. Run `flutter channel` to switch to an official channel.
      If that doesn't fix the issue, reinstall Flutter by following instructions at https://flutter.dev/setup.
    • Framework revision 9d8a7184c6 (12 minutes ago), 2025-09-18 13:41:00 +0100
    • Engine revision ea906b5dc9
    • Dart version 3.10.0 (build 3.10.0-213.0.dev)
    • DevTools version 2.50.0
    • Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop, enable-android, enable-ios, cli-animations, enable-native-assets, omit-legacy-version-file, enable-lldb-debugging
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[✗] Android toolchain - develop for Android devices [32ms]
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/to/linux-android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.


[✗] Chrome - develop for the web (Cannot find Chrome executable at google-chrome) [14ms]
    ! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.

[✓] Linux toolchain - develop for Linux desktop [246ms]
    • clang version 20.1.8
    • cmake version 4.1.1
    • ninja version 1.12.1
    • pkg-config version 2.5.1
    ! Unable to access driver information using 'eglinfo'.
      It is likely available from your distribution (e.g.: apt install mesa-utils)

[✓] Connected device (1 available) [31ms]
    • Linux (desktop) • linux • linux-x64 • Arch Linux 6.16.7-arch1-1

[✓] Network resources [774ms]
    • All expected network resources are available.

! Doctor found issues in 3 categories.