This change adds new commands to matinfo to print dictionaries.
This feature is useful to debug dictionaries, and I just used
it to identify that using a shared dictionary would save ~12 KiB
in the Android build. The macOS build (GLSL + Metal) would go
down to 71 KiB from 136 KiB.
The SPIRV to Metal conversion leaves leading spaces and some
comments. This change also runs the shrinker on optimized Metal
shaders to further reduce the size of shaders.
This enhances the exisiting matc option "--debug" so that it includes
debug information in the resulting SPIR-V.
Previously we tied this to the build configuration which isn't very
flexible. Moreover this needs to be orthogonal to shader opts, because
we often need to debug problems that arise from optimization.
This CL also gives meaningful names to the ubershader materials and
fixes up the new matinfo analysis so that it prints the entire SPIRV
chunk that corresponds to each potentially problematic GLSL codeline.
Motivated by #1516.
* Enable optimization passes on materials with external samplers
Because external samplers are not properly supported by SPIRV and
associated library (spirv-cross and spirv-tools) we currently disable
all optimizations when we encounter a material with external samplers.
This however causes issues on some misbehaved drivers (not running
the optimizations has a side effect which causes a crash). To enable
the optimization pass we simply rely on the Vulkan codegen target to
substitute samplerExternal with sampler2D. We then analyze the output
GLSL (post-optimization) and revert the relevants sampler2D declarations
to samplerExternal declarations.
This fixup only occurs after optimization and for mobile targets and
if external samplers were declared.
* Address review comments
Pixelflinger
Ben Doherty
Romain Guy
Gregory Popovitch
Philip Rideout
Mathias Agopian
Ben Doherty