gltfio: Add Java / Kotlin bindings for Animator.

Fixes #1529.

android/gltfio-android/src/main/cpp/Animator.cpp

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2019 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.
+ */
+
+#include <jni.h>
+
+#include <gltfio/Animator.h>
+
+using namespace filament;
+using namespace filament::math;
+using namespace gltfio;
+using namespace utils;
+
+extern "C" JNIEXPORT void JNICALL
+Java_com_google_android_filament_gltfio_Animator_nApplyAnimation(JNIEnv*, jclass, jlong nativeAnimator,
+        jint index, jfloat time) {
+    Animator* animator = (Animator*) nativeAnimator;
+    animator->applyAnimation(index, time);
+}
+
+extern "C" JNIEXPORT void JNICALL
+Java_com_google_android_filament_gltfio_Animator_nUpdateBoneMatrices(JNIEnv*, jclass, jlong nativeAnimator) {
+    Animator* animator = (Animator*) nativeAnimator;
+    animator->updateBoneMatrices();
+}
+
+extern "C" JNIEXPORT jint JNICALL
+Java_com_google_android_filament_gltfio_Animator_nGetAnimationCount(JNIEnv*, jclass, jlong nativeAnimator) {
+    Animator* animator = (Animator*) nativeAnimator;
+    return animator->getAnimationCount();
+}
+
+extern "C" JNIEXPORT float JNICALL
+Java_com_google_android_filament_gltfio_Animator_nGetAnimationDuration(JNIEnv*, jclass,
+        jlong nativeAnimator, jint index) {
+    Animator* animator = (Animator*) nativeAnimator;
+    return animator->getAnimationDuration(index);
+}
+
+extern "C" JNIEXPORT jstring JNICALL
+Java_com_google_android_filament_gltfio_Animator_nGetAnimationName(JNIEnv* env, jclass,
+        jlong nativeAnimator, jint index) {
+    Animator* animator = (Animator*) nativeAnimator;
+    const char* val = animator->getAnimationName(index);
+    return val ? env->NewStringUTF(val) : nullptr;
+
+}