in the middle of expirimenting with was to implement this drawable api

src/sprite.rs

@@ -97,12 +97,16 @@ impl Sprite {
     }
 }
 
-impl<V, H> DrawableTest<V, H> for Sprite {
+impl<V, H, In> DrawableTest<V, H, In> for Sprite {
     fn get_vertices(&self) -> Vec<V> {
         unimplemented!()
     }
 
-    fn get_handle(&self) -> Vec<H> {
+    fn get_instances(&self) -> Vec<In> {
+        unimplemented!()
+    }
+
+    fn get_handle(&self) -> H {
         unimplemented!()
     }
 }
@@ -285,12 +289,28 @@ impl Text {
     }
 }
 
-impl<V, H> DrawableTest<V, H> for Text {
+pub trait TextHandle {
+    fn do_nothing() -> u32;
+}
+
+pub trait TextInstance {
+    fn get_thing() -> Vec<(u32, u32, u32)>;
+}
+
+pub trait TextVertex {
+    fn get_vertices() -> Vec<(u32, u32, u32)>;
+}
+
+impl<V: TextVertex, H: TextHandle, In: TextInstance> DrawableTest<V, H, In> for Text {
     fn get_vertices(&self) -> Vec<V> {
         unimplemented!()
     }
 
-    fn get_handle(&self) -> Vec<H> {
+    fn get_instances(&self) -> Vec<In> {
+        unimplemented!()
+    }
+
+    fn get_handle(&self) -> H {
         unimplemented!()
     }
 }