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* Adds context creation and WSI routines for Metal and Vulkan. * Enables all tests for the Metal, Vulkan, and OpenGLES backends. * Separate standalone examples for Metal, Vulkan, and OpenGLES have been created. These will be packaged with the SDK. * Disallows the use of OpenGL ES on macOS. * All new public methods are documented. * The SDK version number has been bumped. * Some incorrect nullability annotations were patched. * Tests harness is overhauled to reuse the same underlying context as the playgrounds. * The C++ public header has been updated. Fixes https://github.com/flutter/flutter/issues/159512 Ports https://github.com/flutter/engine/pull/56906
The Impeller Playground
An extension of the testing fixtures set, provides utilities for interactive experimentation with the Impeller rendering subsystem. One the test author is satisfied with the behavior of component as verified in the playground, pixel test assertions can be added to before committing the new test case. Meant to provide a gentle-er on-ramp to testing Impeller components. The WSI in the playground allows for points at which third-party profiling and instrumentation tools can be used to examine isolated test cases.