update external headers

ios/src/MorphHelper.h

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef GLTFIO_MORPHHELPER_H
+#define GLTFIO_MORPHHELPER_H
+
+#include "FFilamentAsset.h"
+#include "FFilamentInstance.h"
+
+#include <filament/MorphTargetBuffer.h>
+
+#include <math/vec4.h>
+
+#include <tsl/robin_map.h>
+
+#include <vector>
+
+struct cgltf_node;
+struct cgltf_mesh;
+struct cgltf_primitive;
+
+namespace gltfio {
+
+/**
+ * Internal class that partitions lists of morph weights and maintains a cache of BufferObject
+ * instances. This allows gltfio to support up to 255 morph targets.
+ *
+ * Each partition is associated with an unordered set of 4 (or fewer) morph target indices, which
+ * we call the "primary indices" for that time slice.
+ *
+ * Animator has ownership over a single instance of MorphHelper, thus it is 1:1 with FilamentAsset.
+ */
+class MorphHelper {
+public:
+    using Entity = utils::Entity;
+    MorphHelper(FFilamentAsset* asset, FFilamentInstance* inst);
+    ~MorphHelper();
+
+    void setWeights(Entity entity, float const* weights, int count) noexcept;
+    int getTargetCount(Entity entity) const noexcept;
+
+private:
+    struct GltfPrimitive {
+        filament::MorphTargetBuffer* targets;
+    };
+
+    struct TableEntry {
+        std::vector<GltfPrimitive> primitives; // TODO: flatten this?
+    };
+
+    void addPrimitive(cgltf_mesh const* mesh, int primitiveIndex, Entity entity);
+
+    tsl::robin_map<Entity, TableEntry> mMorphTable;
+    const FFilamentAsset* mAsset;
+    const FFilamentInstance* mInstance;
+};
+
+} // namespace gltfio
+
+#endif // GLTFIO_MORPHHELPER_H