fix: add ResourceBuffer header directly to Windows build so I don't have to fiddle around getting the CMake path right

thermion_flutter/thermion_flutter/windows/include/ResourceBuffer.h

@@ -0,0 +1,44 @@
+#ifndef RESOURCE_BUFFER_H
+#define RESOURCE_BUFFER_H
+
+#include <stdint.h>
+#include <stdlib.h>
+
+//
+// A ResourceBuffer is a unified interface for working with
+// binary assets across various platforms.
+// This is simply:
+// 1) a pointer to some data
+// 2) the length of the data
+// 3) an ID that can be passed back to the native platform to release the underlying asset when needed.
+//
+typedef struct ResourceBuffer
+{
+  const void *const data;
+  const int32_t size;
+  const int32_t id;
+
+#if defined(__cplusplus)
+  ResourceBuffer(void *const data, int32_t size, int32_t id) : data(data), size(size), id(id) {}
+#endif
+} ResourceBuffer;
+
+typedef void (*LoadFilamentResourceIntoOutPointer)(const char *uri, ResourceBuffer *out);
+typedef ResourceBuffer (*LoadFilamentResource)(const char *uri);
+typedef ResourceBuffer (*LoadFilamentResourceFromOwner)(const char *const, void *const owner);
+typedef void (*FreeFilamentResource)(ResourceBuffer);
+typedef void (*FreeFilamentResourceFromOwner)(ResourceBuffer, void *const owner);
+
+typedef struct ResourceLoaderWrapper
+{
+  LoadFilamentResource loadResource;
+  FreeFilamentResource freeResource;
+  LoadFilamentResourceFromOwner loadFromOwner;
+  FreeFilamentResourceFromOwner freeFromOwner;
+  void *owner;
+  LoadFilamentResourceIntoOutPointer loadToOut;
+} ResourceLoaderWrapper;
+
+void *make_resource_loader(LoadFilamentResourceFromOwner loadFn, FreeFilamentResourceFromOwner freeFn, void *const owner);
+
+#endif