tree 7e245210dd21e51c4e94dfb0ee9765c85513fa85
parent ae687f5b8303c3fc5069ed8568cc4c6eac60ac82
author Brian Ho <hob@chromium.org> 1574294223 +0000
committer Commit Bot service account <commit-bot@chromium.org> 1574294223 +0000

Define an interface to import dma-bufs

This CL adds an API to import a dma-buf into Dawn as a WGPUTexture.

We also add a descriptor type enum to the base
ExternalImageDescriptor struct. This is because all memory import
code (e.g. MemoryService, Texture::CreateFromExternal) takes the
a base ExternalImageDescriptor as a parameter. The dma-buf external
memory and image services, however, will need to downcast to
ExternalImageDescriptorDmaBuf to access import parameters like
stride. Explicitly adding a type enum will let us more safely verify
the type before downcasting.

BUG=chromium:996470

Change-Id: I2d9883a15e9059a91f2c7bdb7a96d74373e18c56
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/13782
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Brian Ho <hob@chromium.org>