It is legal to blit between GL_RGBA8 and GL_BGRA8 sources and
destinations when resolving multisampled renderbuffers. Expand
BlitFramebuffer's validation to handle this case.
Work around a bug in macOS' OpenGL driver querying the number of
samples for GL_BGRA8.
Query GL_MAX_VERTEX_OUTPUT_COMPONENTS on the Core Profile to work
around an error generated on macOS when querying
GL_MAX_VARYING_COMPONENTS.
Expand the BlitFramebuffer tests to cover these cases and start
running them on the OpenGL backend.
BUG=angleproject:891
Change-Id: I4829585d2b6428ce0bc7509c4734d33709a0930b
Reviewed-on: https://chromium-review.googlesource.com/582268
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
