Initial integration of Metal API

lib/mac/CocoaCommon.hpp

@@ -0,0 +1,41 @@
+#ifndef BOO_COCOACOMMON_HPP
+#define BOO_COCOACOMMON_HPP
+#if __APPLE__
+
+#include <Metal/Metal.h>
+#include <QuartzCore/CAMetalLayer.h>
+
+template <class T>
+class NSPtr
+{
+    T m_ptr = 0;
+public:
+    NSPtr() = default;
+    ~NSPtr() {[m_ptr release];}
+    NSPtr(T&& recv) : m_ptr(recv) {}
+    NSPtr& operator=(T&& recv) {[m_ptr release]; m_ptr = recv; return *this;}
+    NSPtr(const NSPtr& other) = delete;
+    NSPtr(NSPtr&& other) = default;
+    NSPtr& operator=(const NSPtr& other) = delete;
+    NSPtr& operator=(NSPtr&& other) = default;
+    operator bool() const {return m_ptr != 0;}
+    T get() const {return m_ptr;}
+    void reset() {[m_ptr release]; m_ptr = 0;}
+};
+
+namespace boo
+{
+struct MetalContext
+{
+    NSPtr<id<MTLDevice>> m_dev;
+    NSPtr<id<MTLCommandQueue>> m_q;
+    struct Window
+    {
+        CAMetalLayer* m_metalLayer = nullptr;
+    };
+    std::unordered_map<IWindow*, Window> m_windows;
+};
+}
+
+#endif // __APPLE__
+#endif // BOO_COCOACOMMON_HPP