Author :
Shahbaz Youssefi
Date :
2021-07-17 00:00:27
Hash :a8807cbf Message :Vulkan: SPIR-V Gen: Support interpolateAt*
The interpolateAt* builtins take their first argument as a pointer, so
only the OpAccessChain result should be given to the corresponding
SPIR-V instruction.
A test is written in this change to handle interpolateAt* when given a
swizzled lvalue, which is not representable in SPIR-V. This can be
supported by having the AST transform:
interpolateAtX(value.zy)
to:
interpolateAtX(value).zy
which can be done right when the function is parsed and the AST node for
it is created (by taking the swizzle out of the parameter and applying
it to the node). However, swizzled lvalues as parameter to
interpolateAt* is only allowed in desktop GLSL, and so the test is
disabled. From the GLSL ES3.2 spec:
> Component selection operators (e.g. .xy) may not be used when
> specifying interpolant.
Bug: angleproject:4889
Change-Id: I043969f22011e6171c7ae225ded3a5013e8cfa4e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3035588
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Tim Van Patten <timvp@google.com>
Shahbaz Youssefi