wgpu: add sdl3 glue

vendor/wgpu/sdl3glue/glue_darwin.odin

@@ -0,0 +1,23 @@
+package wgpu_sdl3_glue
+
+import    "vendor:sdl3"
+import    "vendor:wgpu"
+import CA "vendor:darwin/QuartzCore"
+import NS "core:sys/darwin/Foundation"
+
+GetSurface :: proc(instance: wgpu.Instance, window: ^sdl3.Window) -> wgpu.Surface {
+	ns_window := cast(^NS.Window)sdl3.GetPointerProperty(sdl3.GetWindowProperties(window), sdl3.PROP_WINDOW_COCOA_WINDOW_POINTER, nil)
+	metal_layer := CA.MetalLayer_layer()
+	ns_window->contentView()->setLayer(metal_layer)
+	return wgpu.InstanceCreateSurface(
+		instance,
+		&wgpu.SurfaceDescriptor{
+			nextInChain = &wgpu.SurfaceDescriptorFromMetalLayer{
+				chain = wgpu.ChainedStruct{
+					sType = .SurfaceDescriptorFromMetalLayer,
+				},
+				layer = rawptr(metal_layer),
+			},
+		},
+	)
+}