[gfx] metal backend skeleton (#4223)

* add metal-cpp submodule

* add metal-cpp cmake target

* gfx metal backend skeleton

* add premake support

* add foundation framework

* add metal-cpp include to premake

* update vs project file

---------

Co-authored-by: Simon Kallweit <skallweit@nvidia.com>
Co-authored-by: Jay Kwak <82421531+jkwak-work@users.noreply.github.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/tools/gfx/metal/metal-shader-program.cpp b/tools/gfx/metal/metal-shader-program.cpp
new file mode 100644
index 000000000..05f5f9b53
--- /dev/null
+++ b/tools/gfx/metal/metal-shader-program.cpp
@@ -0,0 +1,49 @@
+// metal-shader-program.cpp
+#include "metal-shader-program.h"
+
+#include "metal-device.h"
+
+namespace gfx
+{
+
+using namespace Slang;
+
+namespace metal
+{
+
+ShaderProgramImpl::ShaderProgramImpl(DeviceImpl* device)
+    : m_device(device)
+{
+}
+
+ShaderProgramImpl::~ShaderProgramImpl()
+{
+}
+
+void ShaderProgramImpl::comFree() { }
+
+Result ShaderProgramImpl::createShaderModule(
+    slang::EntryPointReflection* entryPointInfo, ComPtr<ISlangBlob> kernelCode)
+{
+    if (entryPointInfo == nullptr || kernelCode == nullptr || kernelCode->getBufferSize() == 0)
+    {
+        return SLANG_E_INVALID_ARG;
+    }
+
+    auto realEntryPointName = entryPointInfo->getNameOverride();
+    std::string sourceStr(static_cast<const char*>(kernelCode->getBufferPointer()), kernelCode->getBufferSize());
+    NS::String *nsSourceString = NS::String::alloc()->init(sourceStr.c_str(), NS::UTF8StringEncoding);
+    NS::Error* error;
+    MTL::Library* library = m_device->m_device->newLibrary(nsSourceString, nullptr, &error);
+    if (library == nullptr)
+    {
+        std::cout << error->localizedDescription()->utf8String() << std::endl;
+        return SLANG_E_INVALID_ARG;
+    }
+    m_entryPointNames.add(realEntryPointName);
+    m_modules.add(library);
+    return SLANG_OK;
+}
+
+} // namespace metal
+} // namespace gfx