[Impeller] libImpeller: Add support for Metal and Vulkan rendering. #56906
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chinmaygarde
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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. Fixes flutter/flutter#159512
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Ok, all done. All backends should be enabled, tested, documented, and have examples. I am sure more complicated WSI could be supported (like non vk_surface_khr swapchains) but we can add support for that as it becomes necessary. |
| impeller::ContextVK::Settings impeller_settings; | ||
| impeller_settings.shader_libraries_data = CreateShaderLibraryMappings(); | ||
| impeller_settings.cache_directory = fml::paths::GetCachesDirectory(); | ||
| impeller_settings.enable_validation = true; |
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should this be reading from the settings?
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Nice spot. This gave me so much trouble since reading from the settings was what I was doing initially. But we set setting to this to true here. This causes the system global proc. table to be initialized twice. And, depending on whether the second instance enabled or disables validations, proc. entries are zeroed out. So teardown of say the debug printers in the second context to be torn down won't find the proc. table entry for the deleter. And cause a crash.
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Oh, but you mentioned settings. While I was using switches (that the settings are inferred from). Perhaps I could steal the underlying contexts settings directly. Momentido.
Fixes flutter/flutter#159512