HLSL: add readonly qualifier to tbuffer, so they end up as SRV

glslang/MachineIndependent/iomapper.cpp

@@ -491,6 +491,48 @@ protected:
     }
 };
 
+/********************************************************************************
+The following IO resolver maps types in HLSL register space, as follows:
+
+t – for shader resource views (SRV)
+   TEXTURE1D
+   TEXTURE1DARRAY
+   TEXTURE2D
+   TEXTURE2DARRAY
+   TEXTURE3D
+   TEXTURECUBE
+   TEXTURECUBEARRAY
+   TEXTURE2DMS
+   TEXTURE2DMSARRAY
+   STRUCTUREDBUFFER
+   BYTEADDRESSBUFFER
+   BUFFER
+   TBUFFER
+    
+s – for samplers
+   SAMPLER
+   SAMPLER1D
+   SAMPLER2D
+   SAMPLER3D
+   SAMPLERCUBE
+   SAMPLERSTATE
+   SAMPLERCOMPARISONSTATE
+
+u – for unordered access views (UAV)
+   RWBYTEADDRESSBUFFER
+   RWSTRUCTUREDBUFFER
+   APPENDSTRUCTUREDBUFFER
+   CONSUMESTRUCTUREDBUFFER
+   RWBUFFER
+   RWTEXTURE1D
+   RWTEXTURE1DARRAY
+   RWTEXTURE2D
+   RWTEXTURE2DARRAY
+   RWTEXTURE3D
+
+b – for constant buffer views (CBV)
+   CBUFFER
+ ********************************************************************************/
 struct TDefaultHlslIoResolver : public TDefaultIoResolverBase
 {
     bool validateBinding(EShLanguage /*stage*/, const char* /*name*/, const glslang::TType& type, bool /*is_live*/) override
@@ -498,7 +540,6 @@ struct TDefaultHlslIoResolver : public TDefaultIoResolverBase
         if (type.getQualifier().hasBinding()) {
             const int set = getLayoutSet(type);
 
-            // Use Uav binding if requested: else will pass through to old behavior
             if (isUavType(type))
                 return checkEmpty(set, baseUavBinding + type.getQualifier().layoutBinding);