Improve on spirv generation compile option (#5479)

CompilerOptionName::EmitSpirvViaGLSL and CompilerOptionName::EmitSpirvDirectly
options are not mutually exclusive, but due to compatible reason, we
cannot delete those options. Instead, this change makes the effort to
create a new option name EmitSpirvMethod, and we will turn those two
options into the new one internally. Also, we put a priority implicitly
on those two options, where EmitSpirvDirectly always win if it's set.

We have another location that can setup the same option, where is
through SlangTargetFlags::SLANG_TARGET_FLAG_GENERATE_SPIRV_DIRECTLY.

We should definitely deprecate this flag to avoid more confusing.
But for the same compatible reason, we cannot do that in this PR.
Again, we will encourage people to not use this flag, but using the
CompilerOptionName instead. In this PR, we will also implicitly give
CompilerOptionName higher priority, it means that as long as user setup
the CompilerOptionName for emit spirv method, it always take higher
priority for the final decision.

0 files changed, 0 insertions, 0 deletions