Add sdl2glue to vendor:wgpu package + triangle example

vendor/wgpu/examples/glfw/Makefile

@@ -0,0 +1,17 @@
+FILES := $(wildcard *)
+
+# NOTE: changing this requires changing the same values in the `web/index.html`.
+INITIAL_MEMORY_PAGES := 2000
+MAX_MEMORY_PAGES     := 65536
+
+PAGE_SIZE := 65536
+INITIAL_MEMORY_BYTES := $(shell expr $(INITIAL_MEMORY_PAGES) \* $(PAGE_SIZE))
+MAX_MEMORY_BYTES     := $(shell expr $(MAX_MEMORY_PAGES) \* $(PAGE_SIZE))
+
+web/triangle.wasm: $(FILES) ../../wgpu.js ../../../wasm/js/runtime.js
+	odin build . \
+		-target:js_wasm32 -out:web/triangle.wasm -o:size \
+        -extra-linker-flags:"--export-table --import-memory --initial-memory=$(INITIAL_MEMORY_BYTES) --max-memory=$(MAX_MEMORY_BYTES)"
+
+	cp ../../wgpu.js web/wgpu.js
+	cp ../../../wasm/js/runtime.js web/runtime.js