Allow overriding specialization args via `IShaderObject`. (#1854)

* Allow overriding specialization args via `IShaderObject`.

* Fixes.

Co-authored-by: T. Foley <tfoleyNV@users.noreply.github.com>

3 files changed, 53 insertions, 0 deletions

diff --git a/tools/render-test/render-test-main.cpp b/tools/render-test/render-test-main.cpp
index c04d6db00..5c8011889 100644
--- a/tools/render-test/render-test-main.cpp
+++ b/tools/render-test/render-test-main.cpp
@@ -341,6 +341,26 @@ struct AssignValsFromLayoutContext
 
         SLANG_RETURN_ON_FAIL(assign(ShaderCursor(shaderObject), srcVal->contentVal));
 
+        if (srcVal->specializationArgs.getCount())
+        {
+            List<slang::SpecializationArg> args;
+            for (auto srcArg : srcVal->specializationArgs)
+            {
+                auto argType = slangReflection->findTypeByName(srcArg.getBuffer());
+                if (argType)
+                {
+                    slang::SpecializationArg arg = slang::SpecializationArg::fromType(argType);
+                    args.add(arg);
+                }
+                else
+                {
+                    StdWriters::getError().print(
+                        "error: could not find shader type '%s'\n", srcArg.getBuffer());
+                    return SLANG_E_INVALID_ARG;
+                }
+            }
+            shaderObject->setSpecializationArgs(args.getBuffer(), args.getCount());
+        }
         dstCursor.setObject(shaderObject);
         return SLANG_OK;
     }
diff --git a/tools/render-test/shader-input-layout.cpp b/tools/render-test/shader-input-layout.cpp
index 9362efb45..af15d5f9f 100644
--- a/tools/render-test/shader-input-layout.cpp
+++ b/tools/render-test/shader-input-layout.cpp
@@ -346,6 +346,37 @@ namespace renderer_test
             return SLANG_OK;
         }
 
+        SlangResult parseObjectAttributes(ShaderInputLayout::ObjectVal* val, Misc::TokenReader& parser)
+        {
+            if (parser.AdvanceIf(":"))
+            {
+                while (!parser.IsEnd() && parser.NextToken().Type == Misc::TokenType::Identifier)
+                {
+                    if (parser.AdvanceIf("specialization_args"))
+                    {
+                        parser.Read(Misc::TokenType::LParent);
+                        while (!parser.IsEnd() &&
+                               parser.NextToken().Type != Misc::TokenType::RParent)
+                        {
+                            val->specializationArgs.add(parseTypeName(parser));
+                            if (!parser.AdvanceIf(","))
+                                break;
+                        }
+                        parser.Read(Misc::TokenType::RParent);
+                    }
+                    else
+                    {
+                        throw ShaderInputLayoutFormatException(
+                            StringBuilder() << "Unknown attribute \'" << parser.NextToken().Content << "\' ("
+                                            << parser.NextToken().Position.Line << ")");
+
+                        return SLANG_FAIL;
+                    }
+                }
+            }
+            return SLANG_OK;
+        }
+
         Format parseFormatOption(Misc::TokenReader& parser)
         {
             parser.Read("=");
@@ -511,6 +542,7 @@ namespace renderer_test
                         }
 
                         val->contentVal = parseValExpr(parser);
+                        parseObjectAttributes(val, parser);
                         return val;
                     }
                     else if( parser.AdvanceIf("out") )
diff --git a/tools/render-test/shader-input-layout.h b/tools/render-test/shader-input-layout.h
index adb30c7ec..86e7641f0 100644
--- a/tools/render-test/shader-input-layout.h
+++ b/tools/render-test/shader-input-layout.h
@@ -248,6 +248,7 @@ public:
 
         Slang::String typeName;
         ValPtr contentVal;
+        Slang::List<Slang::String> specializationArgs;
     };
 
     class ArrayVal : public ParentVal