Add attribute.divisor field for instanced rendering

src/rendering/renderers/gl/geometry/GlGeometrySystem.ts

@@ -406,7 +406,11 @@ export class GlGeometrySystem implements System
                     // TODO calculate instance count based of this...
                     if (this.hasInstance)
                     {
-                        gl.vertexAttribDivisor(location, 1);// attribute.divisor);
+                        // Can't use truthiness check to determine if divisor is set,
+                        // since 0 is a valid value for divisor
+                        const divisor = 'divisor' in attribute ? attribute.divisor : 1;
+
+                        gl.vertexAttribDivisor(location, divisor);
                     }
                     else
                     {

src/rendering/renderers/shared/geometry/Geometry.ts

@@ -28,15 +28,17 @@ export interface Attribute
     offset?: number;
     /** is this an instanced buffer? (defaults to false) */
     instance?: boolean;
-    /**  The number of elements to be rendered. If not specified, all vertices after the starting vertex will be drawn. */
+    /** the number of elements to be rendered. If not specified, all vertices after the starting vertex will be drawn. */
     size?: number;
     /** the type of attribute  */
     type?: number;
     /**
-     * The starting vertex in the geometry to start drawing from. If not specified,
+     * the starting vertex in the geometry to start drawing from. If not specified,
      *  drawing will start from the first vertex.
      */
     start?: number;
+    /** attribute divisor for instanced rendering */
+    divisor?: number;
 }
 
 /**
@@ -268,4 +270,3 @@ export class Geometry extends EventEmitter<{
         (this._bounds as null) = null;
     }
 }
-