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

src/canvas/canvas_frame.rs

@@ -1,8 +1,9 @@
 use crate::util::vertex_3d::{Vertex3D};
 use std::sync::Arc;
 use std::collections::HashMap;
-use crate::canvas::canvas_state::{Drawable, CanvasTextureHandle, CanvasImageHandle, CanvasFontHandle};
+use crate::canvas::canvas_state::{Drawable, CanvasTextureHandle, CanvasImageHandle, CanvasFontHandle, DrawableTest};
 use crate::canvas::shader::text_shader::GlyphInstance;
+use std::hash::Hash;
 
 ///
 pub struct CanvasFrame {
@@ -12,10 +13,6 @@ pub struct CanvasFrame {
     pub text_drawables: HashMap<Arc<CanvasFontHandle>, Vec<GlyphInstance>>
 }
 
-pub struct GenericCanvasFrame<V, H, Im, In, T> {
-    frame_data: HashMap<Arc<H>, Vec<(V, Im, In, T)>>
-}
-
 impl CanvasFrame {
 
     /// Creates a bare canvas frame with empty accumulators
@@ -54,4 +51,25 @@ impl CanvasFrame {
             }
         }
     }
+}
+
+pub struct GenericCanvasFrame<H, V, In> {
+    frame_data: HashMap<H, Vec<(Vec<V>, Vec<In>)>>
+}
+
+impl<H, V, In> GenericCanvasFrame<H, V, In>  {
+
+    /// Creates a bare canvas frame with empty accumulators
+    pub fn new() -> GenericCanvasFrame<H, V, In> where H: Eq + Hash {
+        GenericCanvasFrame {
+            frame_data: Default::default()
+        }
+    }
+
+    pub fn draw(&mut self, drawable: &dyn DrawableTest<V, H, In>) where H: Eq + Hash + Clone {
+        self.frame_data
+            .entry(drawable.get_handle().clone())
+            .or_insert(Vec::new())
+            .push((drawable.get_vertices(), drawable.get_instances()));
+    }
 }