Allow unspecialized existential shader parameters (dynamic dispatch). (#1529)

* Allow unspecialized existential shader parameters (dynamic dispatch).

* Fixes.

* Fixes

* disable cuda test

2 files changed, 18 insertions, 3 deletions

diff --git a/tools/render-test/cpu-compute-util.cpp b/tools/render-test/cpu-compute-util.cpp
index 6e1fc12cf..2c9a9dc82 100644
--- a/tools/render-test/cpu-compute-util.cpp
+++ b/tools/render-test/cpu-compute-util.cpp
@@ -374,7 +374,16 @@ SlangResult CPUComputeUtil::populateRTTIEntries(
             switch (rtti.type)
             {
             case RTTIDataEntryType::RTTIObject:
-                ptrValue = sharedLib->findSymbolAddressByName(rtti.typeName.getBuffer());
+                {
+                    auto reflection =
+                        slang::ShaderReflection::get(compilationAndLayout.output.request);
+                    auto concreteType = reflection->findTypeByName(rtti.typeName.getBuffer());
+                    ComPtr<ISlangBlob> outName;
+                    linkage->getTypeRTTIMangledName(concreteType, outName.writeRef());
+                    if (!outName)
+                        return SLANG_FAIL;
+                    ptrValue = sharedLib->findSymbolAddressByName((char*)outName->getBufferPointer());
+                }
                 break;
             case RTTIDataEntryType::WitnessTable:
             {
@@ -385,8 +394,8 @@ SlangResult CPUComputeUtil::populateRTTIEntries(
                 auto interfaceType = reflection->findTypeByName(rtti.interfaceName.getBuffer());
                 if (!interfaceType)
                     return SLANG_FAIL;
-                ISlangBlob* outName = nullptr;
-                linkage->getTypeConformanceWitnessMangledName(concreteType, interfaceType, &outName);
+                ComPtr<ISlangBlob> outName;
+                linkage->getTypeConformanceWitnessMangledName(concreteType, interfaceType, outName.writeRef());
                 if (!outName)
                     return SLANG_FAIL;
                 ptrValue = sharedLib->findSymbolAddressByName((char*)outName->getBufferPointer());
@@ -395,6 +404,8 @@ SlangResult CPUComputeUtil::populateRTTIEntries(
             default:
                 break;
             }
+            if (!ptrValue)
+                return SLANG_FAIL;
             if (rtti.offset >= 0 && rtti.offset + sizeof(ptrValue) <= entry.bufferData.getCount() * sizeof(decltype(entry.bufferData[0])))
             {
                 memcpy(
diff --git a/tools/render-test/shader-input-layout.cpp b/tools/render-test/shader-input-layout.cpp
index edf617f76..40beffc05 100644
--- a/tools/render-test/shader-input-layout.cpp
+++ b/tools/render-test/shader-input-layout.cpp
@@ -412,6 +412,8 @@ namespace renderer_test
                                             parser.Read(")");
                                             offset += 8;
                                             entry.rttiEntries.add(rttiEntry);
+                                            entry.bufferData.add(0);
+                                            entry.bufferData.add(0);
                                             continue;
                                         }
                                         else if (parser.LookAhead("witness"))
@@ -426,6 +428,8 @@ namespace renderer_test
                                             parser.Read(")");
                                             offset += 8;
                                             entry.rttiEntries.add(rttiEntry);
+                                            entry.bufferData.add(0);
+                                            entry.bufferData.add(0);
                                             continue;
                                         }