[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, 75 insertions, 0 deletions

diff --git a/tools/gfx/metal/metal-command-queue.cpp b/tools/gfx/metal/metal-command-queue.cpp
new file mode 100644
index 000000000..c8b36ff1e
--- /dev/null
+++ b/tools/gfx/metal/metal-command-queue.cpp
@@ -0,0 +1,75 @@
+// metal-command-queue.cpp
+#include "metal-command-queue.h"
+
+#include "metal-command-buffer.h"
+#include "metal-fence.h"
+
+namespace gfx
+{
+
+using namespace Slang;
+
+namespace metal 
+{
+
+ICommandQueue* CommandQueueImpl::getInterface(const Guid& guid)
+{
+    if (guid == GfxGUID::IID_ISlangUnknown || guid == GfxGUID::IID_ICommandQueue)
+        return static_cast<ICommandQueue*>(this);
+    return nullptr;
+}
+
+CommandQueueImpl::~CommandQueueImpl()
+{
+}
+
+void CommandQueueImpl::init(DeviceImpl* renderer)
+{
+    m_renderer = renderer;
+
+    MTL::Device* device = m_renderer->m_device;
+    m_commandQueue = device->newCommandQueue(8);
+}
+
+void CommandQueueImpl::waitOnHost()
+{
+}
+
+Result CommandQueueImpl::getNativeHandle(InteropHandle* outHandle)
+{
+    outHandle->api = InteropHandleAPI::Metal;
+    outHandle->handleValue = reinterpret_cast<intptr_t>(m_commandQueue);
+    return SLANG_OK;
+}
+
+const CommandQueueImpl::Desc& CommandQueueImpl::getDesc() { return m_desc; }
+
+Result CommandQueueImpl::waitForFenceValuesOnDevice(
+    GfxCount fenceCount, IFence** fences, uint64_t* waitValues)
+{
+    return SLANG_E_NOT_IMPLEMENTED;
+}
+
+void CommandQueueImpl::queueSubmitImpl(
+    uint32_t count, ICommandBuffer* const* commandBuffers, IFence* fence, uint64_t valueToSignal)
+{
+    for (uint32_t i = 0; i < count; ++i)
+    {
+        CommandBufferImpl* cmdBufImpl = static_cast<CommandBufferImpl*>(commandBuffers[i]);
+        cmdBufImpl->m_commandBuffer->presentDrawable(m_renderer->m_drawable);
+        cmdBufImpl->m_commandBuffer->commit();
+    }
+}
+
+void CommandQueueImpl::executeCommandBuffers(
+    GfxCount count, ICommandBuffer* const* commandBuffers, IFence* fence, uint64_t valueToSignal)
+{
+    if (count == 0 && fence == nullptr)
+    {
+        return;
+    }
+    queueSubmitImpl(count, commandBuffers, fence, valueToSignal);
+}
+
+} // namespace metal
+} // namespace gfx