Fix several silently failing tests (#2767)

* Add missing expected.txt for test

* Diagnostics -> StdWriters in render test

* Allow specifying several test prefixes to run

`slang-test -- tests/foo tests/bar`

* Squash warnings in some tests

* Enable gfx debug layer in gfx test util

Makes this issue present consistently: https://github.com/shader-slang/slang/issues/2766

* Allow DebugDevice to return interfaces instantiated by the debugged object

* Check that we actaully have a shader cache for shader cache tests

---------

Co-authored-by: Yong He <yonghe@outlook.com>

2 files changed, 17 insertions, 1 deletions

diff --git a/tools/gfx/debug-layer/debug-device.cpp b/tools/gfx/debug-layer/debug-device.cpp
index 7790149b6..45374b64f 100644
--- a/tools/gfx/debug-layer/debug-device.cpp
+++ b/tools/gfx/debug-layer/debug-device.cpp
@@ -26,6 +26,20 @@ using namespace Slang;
 namespace debug
 {
 
+SlangResult DebugDevice::queryInterface(SlangUUID const& uuid, void** outObject) noexcept
+{
+    void* intf = getInterface(uuid);
+    if (intf)
+    {
+        addRef();
+        *outObject = intf;
+        return SLANG_OK;
+    }
+
+    // Fallback to trying to get the interface from the debugged object
+    return baseObject->queryInterface(uuid, outObject);
+}
+
 Result DebugDevice::getNativeDeviceHandles(InteropHandles* outHandles)
 {
     return baseObject->getNativeDeviceHandles(outHandles);
diff --git a/tools/gfx/debug-layer/debug-device.h b/tools/gfx/debug-layer/debug-device.h
index db07cdd1b..5b8424093 100644
--- a/tools/gfx/debug-layer/debug-device.h
+++ b/tools/gfx/debug-layer/debug-device.h
@@ -12,7 +12,9 @@ namespace debug
 class DebugDevice : public DebugObject<IDevice>
 {
 public:
-    SLANG_COM_OBJECT_IUNKNOWN_ALL;
+    SlangResult SLANG_MCALL queryInterface(SlangUUID const& uuid, void** outObject) noexcept override;
+    SLANG_COM_OBJECT_IUNKNOWN_ADD_REF;
+    SLANG_COM_OBJECT_IUNKNOWN_RELEASE;
 
 public:
     DebugDevice();