GLSL SSBO Support (#3400)

* Squash warnings and fix build with SLANG_EMBED_STDLIB

* Add GLSLShaderStorageBuffer magic wrapper

* Make GLSLSSBO not a uniform type

* Buffers are global variables

* Allow creating ssbo aggregate types

* Allow reading from RWSB using builder

* Nicer debug printing for ssbos

* Lower SSBO to RWSB

* Parse interface blocks into wrapped structs

* Lower Interface Block Decls to structs

* remove comment

* Two simple ssbo tests

* Move ssbo pass earlier

* Correct mutable buffer detection

* Do not replace ssbo usages outside of blocks

* Treat GLSLSSBO as a mutable buffer for type layouts

* regenerate vs projects

* Correctly detect ssbo types

* Diagnose illegal ssbo

* remove unreachable code

* neaten

* ci wobble

* Make GLSLSSBO ast handling more uniform

* Add modifier cases for glsl

* Use empty val info for unhandled interface blocks

necessary for ./tests/glsl/out-binding-redeclaration.slang

* more sophisticated modifier check

* Correct ssbo wrapper name

1 files changed, 8 insertions, 7 deletions

diff --git a/source/slang/slang-check-decl.cpp b/source/slang/slang-check-decl.cpp
index 75aed010d..0df9619b6 100644
--- a/source/slang/slang-check-decl.cpp
+++ b/source/slang/slang-check-decl.cpp
@@ -1253,7 +1253,8 @@ namespace Slang
                 // without any `uniform` modifiers as true global variables by default.
                 if (!varDecl->findModifier<HLSLUniformModifier>() &&
                     !varDecl->findModifier<InModifier>() &&
-                    !varDecl->findModifier<OutModifier>())
+                    !varDecl->findModifier<OutModifier>() &&
+                    !varDecl->findModifier<GLSLBufferModifier>())
                 {
                     if (!as<ResourceType>(varDecl->type) && !as<PointerLikeType>(varDecl->type))
                     {
@@ -1584,7 +1585,7 @@ namespace Slang
         addModifier(aggTypeDecl, m_astBuilder->create<SynthesizedModifier>());
 
         // The visibility of synthesized decl should be the min of the parent decl and the requirement.
-        if (auto visModifier = requirementDeclRef.getDecl()->findModifier<VisibilityModifier>())
+        if (requirementDeclRef.getDecl()->findModifier<VisibilityModifier>())
         {
             auto requirementVisibility = getDeclVisibility(requirementDeclRef.getDecl());
             auto thisVisibility = getDeclVisibility(context->parentDecl);
@@ -1833,7 +1834,7 @@ namespace Slang
         if (moduleDecl->members.getCount() > 0)
         {
             auto firstMember = moduleDecl->members[0];
-            if (auto implDecl = as<ImplementingDecl>(firstMember))
+            if (as<ImplementingDecl>(firstMember))
             {
                 if (!getShared()->isInLanguageServer())
                 {
@@ -2993,7 +2994,7 @@ namespace Slang
                 addModifier(synFuncDecl, attr);
             }
             // The visibility of synthesized decl should be the min of the parent decl and the requirement.
-            if (auto visModifier = requiredMemberDeclRef.getDecl()->findModifier<VisibilityModifier>())
+            if (requiredMemberDeclRef.getDecl()->findModifier<VisibilityModifier>())
             {
                 auto requirementVisibility = getDeclVisibility(requiredMemberDeclRef.getDecl());
                 auto thisVisibility = getDeclVisibility(context->parentDecl);
@@ -3539,7 +3540,7 @@ namespace Slang
         synPropertyDecl->parentDecl = context->parentDecl;
 
         // The visibility of synthesized decl should be the min of the parent decl and the requirement.
-        if (auto visModifier = requiredMemberDeclRef.getDecl()->findModifier<VisibilityModifier>())
+        if (requiredMemberDeclRef.getDecl()->findModifier<VisibilityModifier>())
         {
             auto requirementVisibility = getDeclVisibility(requiredMemberDeclRef.getDecl());
             auto thisVisibility = getDeclVisibility(context->parentDecl);
@@ -7049,11 +7050,11 @@ namespace Slang
         }
 
         auto firstMember = fileDecl->members[0];
-        if (auto moduleDeclaration = as<ModuleDeclarationDecl>(firstMember))
+        if (as<ModuleDeclarationDecl>(firstMember))
         {
             // We are trying to implement a file that defines a module, this is expected.
         }
-        else if (auto implementing = as<ImplementingDecl>(firstMember))
+        else if (as<ImplementingDecl>(firstMember))
         {
             getSink()->diagnose(decl->moduleNameAndLoc.loc, Diagnostics::implementingMustReferencePrimaryModuleFile);
             return;