This option increases the max_id_bound in the optimizer to 0x3FFFFFFF, and then runs a
compact-id pass if the final result has a max_id greater than the standard limit of 0x3FFFFF.
The dependency was only because of the SpvOptions struct which is used
in both, but really is part of the glslang public interface and should
be in the public GlslangToSpv.h header.
GlslangToSpv.h only declares functions with opaque references to to
TIntermediate, for which a simple "class TIntermediate;" declaration is
adequate. This means that Include/intermediate.h no longer needs to be
installed as part of glslang's public interface.
Also added known-good mechanism to fetch latest validated spirv-tools.
Also added -Od and -Os to disable optimizer and optimize for size.
Fetching spirv-tools is optional for both glsl and hlsl. Legalization
of hlsl is done by default if spirv-opt is present at cmake time.
Optimization for glsl is currently done through the option -Os.
Legalization testing is currently only done on four existing shaders.
A separate baseLegalResults directory holds those results. All previous
testing is done with the optimizer disabled.
The codebase seems to use both “#pragma once“ approach, and “#ifndef / #define” approach,
so I picked pragma once as that one is less typing & less brittle.
When glslang is built with some other build system and lumped/unity builds are used,
without the include guards some headers would get included multiple times, leading to duplicate
declaration errors.
Previously GlslangToSpv() reported missing/TBD functionalities
by directly writing to stdout using printf. That could cause
problems to callers of GlslangToSpv(). This patch cleans up
the error reporting logic in GlslangToSpv(), TGlslangToSpvTraverser,
and spv::Builder a little bit to use ostringstream.
Also fixed the usage of GlslangToSpv() in GTest fixtures to
capture warnings/errors reported when translating AST to SPIR-V.
