[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, 54 insertions, 0 deletions

diff --git a/tools/gfx/metal/metal-command-queue.h b/tools/gfx/metal/metal-command-queue.h
new file mode 100644
index 000000000..298b0a09a
--- /dev/null
+++ b/tools/gfx/metal/metal-command-queue.h
@@ -0,0 +1,54 @@
+// metal-command-queue.h
+#pragma once
+
+#include "metal-base.h"
+#include "metal-device.h"
+
+namespace gfx
+{
+
+using namespace Slang;
+
+namespace  metal
+{
+
+class CommandQueueImpl
+    : public ICommandQueue
+    , public ComObject
+{
+public:
+    SLANG_COM_OBJECT_IUNKNOWN_ALL
+    ICommandQueue* getInterface(const Guid& guid);
+
+public:
+    Desc m_desc;
+    RefPtr<DeviceImpl> m_renderer;
+    MTL::CommandQueue* m_commandQueue = nullptr;
+    ~CommandQueueImpl();
+
+    void init(DeviceImpl* renderer);
+
+    virtual SLANG_NO_THROW void SLANG_MCALL waitOnHost() override;
+
+    virtual SLANG_NO_THROW Result SLANG_MCALL getNativeHandle(InteropHandle* outHandle) override;
+
+    virtual SLANG_NO_THROW const Desc& SLANG_MCALL getDesc() override;
+
+    virtual SLANG_NO_THROW Result SLANG_MCALL waitForFenceValuesOnDevice(
+        GfxCount fenceCount, IFence** fences, uint64_t* waitValues) override;
+
+    void queueSubmitImpl(
+        uint32_t count,
+        ICommandBuffer* const* commandBuffers,
+        IFence* fence,
+        uint64_t valueToSignal);
+
+    virtual SLANG_NO_THROW void SLANG_MCALL executeCommandBuffers(
+        GfxCount count,
+        ICommandBuffer* const* commandBuffers,
+        IFence* fence,
+        uint64_t valueToSignal) override;
+};
+
+} // namespace metal
+} // namespace gfx