Fantasizing about C API and plugins

src/assets/Textures.zig

@@ -141,7 +141,7 @@ pub fn deinit(self: *Textures, engine: *Engine, allocator: std.mem.Allocator) vo
 /// Get the ID of a texture given its filename (as a string) and usage. Returns
 /// `null` if such texture hasn't been loaded. When the filename is `null`,
 /// returns an empty texture ID appropriate for given usage.
-pub fn get(self: *const Textures, maybe_filename: []const u8, usage: Texture.Usage) ?Id {
+pub fn get(self: *const Textures, maybe_filename: ?[]const u8, usage: Texture.Usage) ?Id {
     if (maybe_filename) |filename| {
         return self.map.get(.{
             // If the atom doesn't exist, then the texture cannot possibly exist.