Lib Import & CMake & init window code

deps/imgui-docking/examples/example_apple_metal/Makefile

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+# Makefile for example_apple_metal, for macOS only (**not iOS**)
+CXX = clang++
+EXE = example_apple_metal
+IMGUI_DIR = ../../
+SOURCES = main.mm
+SOURCES += $(IMGUI_DIR)/imgui.cpp $(IMGUI_DIR)/imgui_demo.cpp $(IMGUI_DIR)/imgui_draw.cpp $(IMGUI_DIR)/imgui_tables.cpp $(IMGUI_DIR)/imgui_widgets.cpp
+SOURCES += $(IMGUI_DIR)/backends/imgui_impl_osx.mm $(IMGUI_DIR)/backends/imgui_impl_metal.mm
+
+CXXFLAGS = -std=c++11 -ObjC++ -fobjc-arc -Wall -Wextra -I$(IMGUI_DIR) -I$(IMGUI_DIR)/backends
+FRAMEWORKS = -framework AppKit -framework Metal -framework MetalKit -framework QuartzCore -framework GameController
+
+all: $(EXE)
+
+$(EXE): $(SOURCES)
+	$(CXX) $(CXXFLAGS) $^ $(FRAMEWORKS) -o $@
+
+run: all
+	./$(EXE)
+
+clean:
+	rm -f $(EXE) *.o