Add gfx unit testing framework. (#1943)

* Add gfx unit testing framework.

* Fix compilation error.

* Reset gfxDebugCallback after render_test.

* Pass enabledApi flags through.

* Fix for code review suggestions.

Co-authored-by: Yong He <yhe@nvidia.com>

2 files changed, 86 insertions, 0 deletions

diff --git a/tools/unit-test/slang-unit-test.cpp b/tools/unit-test/slang-unit-test.cpp
new file mode 100644
index 000000000..a31614c05
--- /dev/null
+++ b/tools/unit-test/slang-unit-test.cpp
@@ -0,0 +1,48 @@
+#include "slang-unit-test.h"
+#include "slang.h"
+#include "source/core/slang-basic.h"
+
+struct SlangUnitTest
+{
+    const char* name;
+    slang::UnitTestFunc func;
+};
+
+class SlangUnitTestModule : public slang::IUnitTestModule
+{
+public:
+    Slang::List<SlangUnitTest> tests;
+
+    virtual SlangInt getTestCount() override
+    {
+        return tests.getCount();
+    }
+    virtual const char* getTestName(SlangInt index) override
+    {
+        return tests[index].name;
+    }
+
+    virtual slang::UnitTestFunc getTestFunc(SlangInt index) override
+    {
+        return tests[index].func;
+    }
+};
+
+SlangUnitTestModule* _getTestModule()
+{
+    static SlangUnitTestModule testModule;
+    return &testModule;
+}
+
+extern "C"
+{
+SLANG_DLL_EXPORT slang::IUnitTestModule* slangUnitTestGetModule()
+{
+    return _getTestModule();
+}
+}
+
+slang::UnitTestRegisterHelper::UnitTestRegisterHelper(const char* name, UnitTestFunc testFunc)
+{
+    _getTestModule()->tests.add(SlangUnitTest{ name, testFunc });
+}
diff --git a/tools/unit-test/slang-unit-test.h b/tools/unit-test/slang-unit-test.h
new file mode 100644
index 000000000..7651e6b46
--- /dev/null
+++ b/tools/unit-test/slang-unit-test.h
@@ -0,0 +1,38 @@
+#pragma once
+
+#include "slang.h"
+#include "source/core/slang-render-api-util.h"
+
+namespace slang
+{
+    struct UnitTestContext
+    {
+        slang::IGlobalSession* slangGlobalSession;
+        const char* workDirectory;
+        ISlangWriter* outputWriter;
+        Slang::RenderApiFlags enabledApis;
+    };
+
+    typedef SlangResult (*UnitTestFunc)(UnitTestContext*);
+
+    class IUnitTestModule
+    {
+    public:
+        virtual SlangInt getTestCount() = 0;
+        virtual const char* getTestName(SlangInt index) = 0;
+        virtual UnitTestFunc getTestFunc(SlangInt index) = 0;
+    };
+
+    class UnitTestRegisterHelper
+    {
+    public:
+        UnitTestRegisterHelper(const char* name, UnitTestFunc testFunc);
+    };
+
+    typedef slang::IUnitTestModule* (*UnitTestGetModuleFunc)();
+
+#define SLANG_UNIT_TEST(name) \
+    SlangResult name(slang::UnitTestContext* context); \
+    slang::UnitTestRegisterHelper _##name##RegisterHelper(#name, name); \
+    SlangResult name(slang::UnitTestContext* context)
+}