tree d16a0b36d4d84c181bfa7b6bfb4deae1bc68d09a
parent 3a2a27971487769c4581c876ea379854a4fe997a
author Stephen White <senorblanco@chromium.org> 1656516581 +0000
committer Dawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1656516581 +0000

GL: implement EGL context creation in Dawn native.

An abstract base class (Device::Context) is used to avoid adding dependencies to Device, with ContextEGL derived from it. This also
leaves open the possibility of supporting other native GL contexts
in the future (e.g., glX). One temporary EGLContext is created by opengl::Backend during Adapter discovery, then one is created for and
owned by each Device.

Contexts for the desktop GL backend are also managed via EGL, which
works for most modern drivers. This also means that GLFW is now
always used in GLFW_NO_API mode.

Since contexts are now per-device, all of the default GL state
setting and debug output setup was moved from Adapter to Device.

Bug: dawn:810
Change-Id: Idfe30939f155d026fcad549787fc167cc43aa3cb
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/93981
Commit-Queue: Stephen White <senorblanco@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>