Impeller breaks mesh gradients #153964
Description
Steps to reproduce
When using mesh gradients from the mesh package, on the last stable (3.24.1), the rendering on the impeller is all messed up.
The package works by using the '.drawVertices' API passing texture coordinates to draw patches of a mesh gradient image.
I understand this is an advanced usage but I don't see any anti-pattern on this.
It works fine on Skia.
Actual results
Example mesh gradient when using impeller on 3.24.1:
Expected results
Same mesh gradient when using skia:
Code sample
Code sample
OMeshRect(
width: 3,
height: 4,
colorSpace: OMeshColorSpace.linear,
vertices: [
(0.0, 0.0).v, (0.5, 0.0).v, (1.0, 0.0).v, //
(0.0, 0.33).v,
(0.5, 0.5).v,
(1.0, 0.33).v, //
(0.0, 0.66).v,
(0.5, 0.66).v.bezier(),
(1.0, 0.66).v, //
(0.0, 1.0).v, (0.5, 1.0).v, (1.0, 1.0).v, //
],
colors: const [
Colors.red, Colors.green, Colors.blue, //
Colors.yellow, Colors.purple, Colors.orange, //
Colors.teal, Colors.green, Colors.pink, //
Colors.cyan, Colors.pinkAccent, Colors.amber, //
],
)Screenshots or Video
No response
Logs
No relevant logs
Flutter Doctor output
Doctor output
Reproduced on beta:
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel beta, 3.25.0-0.1.pre, on macOS 14.5
darwin-arm64, locale en-GB)
[✓] Android toolchain - develop for Android devices (Android SDK
version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 16.0)
• No issues found!Reproduced on stable:
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.24.1, on macOS 14.5
darwin-arm64, locale en-GB)
[✓] Android toolchain - develop for Android devices (Android SDK
version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 16.0)
• No issues found!Reproduced on main:
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel master, 3.25.0-1.0.pre.94, on macOS 14.5
darwin-arm64, locale en-GB)
[✓] Android toolchain - develop for Android devices (Android SDK
version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 16.0)
• No issues found!Metadata
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Labels
High-priority issues at the top of the work listIt was better in the past than it is nowUI 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 3.24Found to occur in 3.25The 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