Platforms & web

The same glass on Impeller (Metal, Vulkan, GLES), on Skia, and on the web with CanvasKit and Skwasm.

g1455 is Dart and fragment shaders, with no platform code of its own. The glass renders byte-identically on Impeller and on Skia, and it works on the web.

Renderers

Impeller on Metal (iOS, macOS), Vulkan and GLES (Android).
Skia/GLES, which Android falls back to below API 29 and on Vivante GPUs.

There is nothing to switch on per platform: the same GlassHost and the same surfaces work everywhere.

Web

The glass works on Flutter web with both renderers, CanvasKit and Skwasm. This very site is a Flutter web app: every demo on it is the package running in your browser, under one GlassHost in the app's builder:.

Note

Browsers do not tell an app about Reduce Transparency, increased contrast or thermal state. Declare what you know, as on any platform: see What the app declares.

Shaders

Every bundled shader is compiled for all five shader targets (SkSL, Vulkan, GLES, GLES3 and Metal) in the package's own test suite, so a shader that one of the compilers would reject fails the package's tests rather than your app.

Hardware and cost

What the glass costs differs between GPU families, and the package's measurements come from two of them: an Adreno 830 on Vulkan and Apple GPUs on Metal. On other hardware the glass works the same; only the reported prices are missing. See What the app declares for GlassHost.hardware, and Performance for keeping the cost down on any device.