Add utility classes for dealing with Windows

Most for GLFW and SDL only

core/sys/darwin/QuartzCore/QuartzCore.odin

@@ -0,0 +1,54 @@
+package objc_QuartzCore
+
+import NS "core:sys/darwin/Foundation"
+import MTL "core:sys/darwin/Metal"
+import "core:intrinsics"
+
+@(private)
+msgSend :: intrinsics.objc_send
+
+@(objc_class="CAMetalLayer")
+MetalLayer :: struct{ using _: NS.Layer}
+
+@(objc_type=MetalLayer, objc_name="device")
+MetalLayer_device :: proc(self: ^MetalLayer) -> ^MTL.Device {
+	return msgSend(^MTL.Device, self, "device")
+}
+@(objc_type=MetalLayer, objc_name="setDevice")
+MetalLayer_setDevice :: proc(self: ^MetalLayer, device: ^MTL.Device) {
+	msgSend(nil, self, "setDevice:", device)
+}
+
+@(objc_type=MetalLayer, objc_name="opaque")
+MetalLayer_opaque :: proc(self: ^MetalLayer) -> NS.BOOL {
+	return msgSend(NS.BOOL, self, "opaque")
+}
+@(objc_type=MetalLayer, objc_name="setOpaque")
+MetalLayer_setOpaque :: proc(self: ^MetalLayer, opaque: NS.BOOL) {
+	msgSend(nil, self, "setOpaque:", opaque)
+}
+
+@(objc_type=MetalLayer, objc_name="preferredDevice")
+MetalLayer_preferredDevice :: proc(self: ^MetalLayer) -> ^MTL.Device {
+	return msgSend(^MTL.Device, self, "preferredDevice")
+}
+@(objc_type=MetalLayer, objc_name="pixelFormat")
+MetalLayer_pixelFormat :: proc(self: ^MetalLayer) -> MTL.PixelFormat {
+	return msgSend(MTL.PixelFormat, self, "pixelFormat")
+}
+@(objc_type=MetalLayer, objc_name="framebufferOnly")
+MetalLayer_framebufferOnly :: proc(self: ^MetalLayer) -> NS.BOOL {
+	return msgSend(NS.BOOL, self, "framebufferOnly")
+}
+
+
+@(objc_class="CAMetalDrawable")
+MetalDrawable :: struct { using _: MTL.Drawable }
+
+MetalDrawable_layer :: proc(self: ^MetalDrawable) -> ^MetalLayer {
+	return msgSend(^MetalLayer, self, "layer")
+}
+
+MetalDrawable_texture :: proc(self: ^MetalDrawable) -> ^MTL.Texture {
+	return msgSend(^MTL.Texture, self, "texture")
+}