tree f5d2a327268cb0647759c9cb1013bfbdf6e4088b
parent 31cfdb111e939b645073d7a986164faa2db77252
author David Neto <dneto@google.com> 1594930522 +0000
committer David Neto <dneto@google.com> 1594930522 +0000

[spirv-reader] Handle gl_Position

Emits it as a module-level variable.  Deconstruct and throw away
the gl_PerVertex struct.

Not handled: unusual patterns that are technically valid but
which don't occur in practice:
- loading, storing, or producing intermediate values of the whole structure.
- multiple definitions of the per-vertex structure (e.g. if someone had
  put both a vertex shader and a tessellation shader in the same
  module.)

Bug: tint:3, tint:99
Change-Id: I3ad9ff6ab780a002367f01f385bfa7d6ddba6db9
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/24880
Reviewed-by: dan sinclair <dsinclair@chromium.org>