BatchedMesh: Add getInstanceCount/setInstanceCount methods for instanced

types/three/src/objects/BatchedMesh.d.ts

@@ -156,6 +156,19 @@ declare class BatchedMesh extends Mesh<BufferGeometry, Material> {
      */
     setGeometryAt(index: number, geometry: BufferGeometry): number;
 
+    /**
+     * Gets the instance count of the geometry at `index`. Returns `null` if instance counts are not configured.
+     * @param index The index of an instance. Values have to be in the range [0, count].
+     */
+    getInstanceCountAt(index: number): number | null;
+
+    /**
+     * Sets an instance count of the geometry at `index`.
+     * @param index Which geometry index to configure an instance count for.
+     * @param instanceCount The number of instances to render of the given geometry index.
+     */
+    setInstanceCountAt(index: number, instanceCount: number): number;
+
     deleteGeometry(index: number): this;
 
     getBoundingBoxAt(index: number, target: Box3): Box3 | null;

types/three/src/renderers/webgl/WebGLBufferRenderer.d.ts

@@ -12,4 +12,10 @@ export class WebGLBufferRenderer {
     render: (start: any, count: number) => void;
     renderInstances: (start: any, count: number, primcount: number) => void;
     renderMultiDraw: (starts: Int32Array, counts: Int32Array, drawCount: number) => void;
+    renderMultiDrawInstances: (
+        starts: Int32Array,
+        counts: Int32Array,
+        drawCount: number,
+        primcount: Int32Array,
+    ) => void;
 }

types/three/src/renderers/webgl/WebGLIndexedBufferRenderer.d.ts

@@ -6,4 +6,10 @@ export class WebGLIndexedBufferRenderer {
     render: (start: any, count: number) => void;
     renderInstances: (start: any, count: number, primcount: number) => void;
     renderMultiDraw: (starts: Int32Array, counts: Int32Array, drawCount: number) => void;
+    renderMultiDrawInstances: (
+        starts: Int32Array,
+        counts: Int32Array,
+        drawCount: number,
+        primcount: Int32Array,
+    ) => void;
 }