[Impeller] Shader render upside down using impeller engine with OpenGLES backend #169429
Description
Steps to reproduce
- Clone repo: https://github.com/laishere/impeller_upside_down
- Run the app on android (I tested the result on android-arm64 emulator API 30)
Expected results
The texture should be rendered correctly.
Actual results
The texture is rendered upside down on y axis.
Code sample
Check the demo repo.
Screenshots or Video
Screenshots / Video demonstration
Logs
Logs
E/flutter (24330): [ERROR:flutter/impeller/toolkit/egl/egl.cc(56)] EGL Error: Success (12288) in ../../../flutter/impeller/toolkit/egl/display.cc:161
I/flutter (24330): [IMPORTANT:flutter/shell/platform/android/android_context_gl_impeller.cc(94)] Using the Impeller rendering backend (OpenGLES).Flutter Doctor output
Doctor output
[✓] Flutter (Channel stable, 3.32.0, on macOS 15.5 24F74 darwin-arm64, locale
zh-Hans-CN) [1,772ms]
• Flutter version 3.32.0 on channel stable at /Users/laishere/sdk/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision be698c48a6 (6 days ago), 2025-05-19 12:59:14 -0700
• Engine revision 1881800949
• Dart version 3.8.0
• DevTools version 2.45.1
[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.1)
[3.1s]
• Android SDK at /Users/laishere/sdk/Android
• Platform android-35, build-tools 35.0.1
• Java binary at: /Applications/Android
Studio.app/Contents/jbr/Contents/Home/bin/java
This is the JDK bundled with the latest Android Studio installation on
this machine.
To manually set the JDK path, use: `flutter config
--jdk-dir="path/to/jdk"`.
• Java version OpenJDK Runtime Environment (build 21.0.5+-13047016-b750.29)
• All Android licenses accepted.
[!] Xcode - develop for iOS and macOS (Xcode 16.1) [1,796ms]
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 16B40
✗ CocoaPods not installed.
CocoaPods is a package manager for iOS or macOS platform code.
Without CocoaPods, plugins will not work on iOS or macOS.
For more info, see https://flutter.dev/to/platform-plugins
For installation instructions, see
https://guides.cocoapods.org/using/getting-started.html#installation
[✓] Chrome - develop for the web [8ms]
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 2024.2) [7ms]
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 21.0.5+-13047016-b750.29)
[✓] VS Code (version 1.100.2) [6ms]
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.110.0
[✓] Connected device (4 available) [6.0s]
• sdk gphone arm64 (mobile) • emulator-5554 • android-arm64 •
Android 11 (API 30) (emulator)
• la iPhone (mobile) • 00008140-000935E00CF1801C • ios •
iOS 18.5 22F76
• macOS (desktop) • macos • darwin-arm64 •
macOS 15.5 24F74 darwin-arm64
• Chrome (web) • chrome • web-javascript •
Google Chrome 136.0.7103.114
[✓] Network resources [1,173ms]
• All expected network resources are available.Metadata
Metadata
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Labels
Important issues not at the top of the work listUI glitches reported at the engine/skia or impeller rendering levelImpeller rendering backend issues and features requestsflutter/engine related. See also e: labels.Found to occur in 3.32Found to occur in 3.33The issue has been confirmed reproducible and is ready to work onIssue is closed as already fixed in a newer versionOwned by Engine teamTriaged by Engine team