Mesh shader support (#2464)

* Add gdb generated files to .gitignore

* Switch to c++17

TODO: Ellie update coding style doc

* WIP mesh shaders

* Add MeshOutputType and mesh output decorations

* Lift array type layout creation out of _createTypeLayout

in preparation for sharing it elsewhere

* Initial pass at GLSL legalization for mesh shaders

* Create output types for builtin mesh outputs

This should be rendered as an out paramter block

* Handle writes to member fields in mesh shader output

* Per primitive output from mesh shaders

* Add mesh shader tests

* Redeclare mesh output builtins

* Remove unused instruction

* Emit explicit mesh output max max size

* Add unimplemented warning for array members in mesh output

* Implement mesh output splitting for GLSL in terms of getSubscriptVal

* Allow HLSL syntax for mesh output modifiers

* Improve error messages for mesh output

* Add test for HLSL style mesh output syntax

* Emit explicit mesh output indices max size

* HLSL generation support for mesh shaders

* Better errors for mesh shader misuse

* Neaten comments

* Regenerate vs2019 project files

* Fix build on vs2019

* Retreat on c++17

Will make the change in a separate PR

* slang-glslang binary dep 11.10.0 -> 11.12.0-32

* Fixes for msvc compiler

* Update msvc project

2 files changed, 8 insertions, 0 deletions

diff --git a/build/visual-studio/slang/slang.vcxproj b/build/visual-studio/slang/slang.vcxproj
index 020bacb0e..42eb3c26c 100644
--- a/build/visual-studio/slang/slang.vcxproj
+++ b/build/visual-studio/slang/slang.vcxproj
@@ -365,6 +365,7 @@ IF EXIST ..\..\..\external\slang-glslang\bin\windows-aarch64\release\slang-glsla
     <ClInclude Include="..\..\..\source\slang\slang-ir-insts.h" />

     <ClInclude Include="..\..\..\source\slang\slang-ir-layout.h" />

     <ClInclude Include="..\..\..\source\slang\slang-ir-legalize-array-return-type.h" />

+    <ClInclude Include="..\..\..\source\slang\slang-ir-legalize-mesh-outputs.h" />

     <ClInclude Include="..\..\..\source\slang\slang-ir-legalize-varying-params.h" />

     <ClInclude Include="..\..\..\source\slang\slang-ir-link.h" />

     <ClInclude Include="..\..\..\source\slang\slang-ir-liveness.h" />

@@ -533,6 +534,7 @@ IF EXIST ..\..\..\external\slang-glslang\bin\windows-aarch64\release\slang-glsla
     <ClCompile Include="..\..\..\source\slang\slang-ir-inline.cpp" />

     <ClCompile Include="..\..\..\source\slang\slang-ir-layout.cpp" />

     <ClCompile Include="..\..\..\source\slang\slang-ir-legalize-array-return-type.cpp" />

+    <ClCompile Include="..\..\..\source\slang\slang-ir-legalize-mesh-outputs.cpp" />

     <ClCompile Include="..\..\..\source\slang\slang-ir-legalize-types.cpp" />

     <ClCompile Include="..\..\..\source\slang\slang-ir-legalize-varying-params.cpp" />

     <ClCompile Include="..\..\..\source\slang\slang-ir-link.cpp" />

diff --git a/build/visual-studio/slang/slang.vcxproj.filters b/build/visual-studio/slang/slang.vcxproj.filters
index 9e7d0db5e..45eb4d755 100644
--- a/build/visual-studio/slang/slang.vcxproj.filters
+++ b/build/visual-studio/slang/slang.vcxproj.filters
@@ -228,6 +228,9 @@
     <ClInclude Include="..\..\..\source\slang\slang-ir-legalize-array-return-type.h">

       <Filter>Header Files</Filter>

     </ClInclude>

+    <ClInclude Include="..\..\..\source\slang\slang-ir-legalize-mesh-outputs.h">

+      <Filter>Header Files</Filter>

+    </ClInclude>

     <ClInclude Include="..\..\..\source\slang\slang-ir-legalize-varying-params.h">

       <Filter>Header Files</Filter>

     </ClInclude>

@@ -728,6 +731,9 @@
     <ClCompile Include="..\..\..\source\slang\slang-ir-legalize-array-return-type.cpp">

       <Filter>Source Files</Filter>

     </ClCompile>

+    <ClCompile Include="..\..\..\source\slang\slang-ir-legalize-mesh-outputs.cpp">

+      <Filter>Source Files</Filter>

+    </ClCompile>

     <ClCompile Include="..\..\..\source\slang\slang-ir-legalize-types.cpp">

       <Filter>Source Files</Filter>

     </ClCompile>