tree 4cec8916655aafa9feb214d0a09ac5d346a24438
parent 24f802a5dd2b45e167ed2d7f9060ffa9f6060e81
author Bill Hollings <bill.hollings@brenwill.com> 1645550235 -0500
committer Bill Hollings <bill.hollings@brenwill.com> 1645550235 -0500

Align flattened shader inputs to previous stage output structs.

When flattening shader inputs for stage_in, which are to be read from a buffer
that was populated as nested structs during an earlier stage, the structs will
be aligned according to C++ rules, which can affect the alignment of the first
member of the flattened input struct.

Add SPIRVShaderOutput::firstStructMemberAlignment to track the alignment
requirements of the first member of a nested structure, and recursively
determine the alignment of the first member of each nested output structure.

Move sizeOfOutput() from MVKPipeline.mm to SPIRVReflection.h,
rename to getShaderOutputSize(), and add getShaderOutputAlignment()
to extract member alignment.