add clearAssets method to viewer

ios/src/FilamentViewer.cpp

@@ -359,6 +359,7 @@ SceneAsset *FilamentViewer::loadGlb(const char *const uri) {
     Log("Unknown error loading asset.");
   } else {
     _assets.push_back(asset);
+    Log("GLB loaded, asset at index %d", _assets.size() - 1);
   }
   return asset;
 }
@@ -376,10 +377,25 @@ SceneAsset *FilamentViewer::loadGltf(const char *const uri,
   return asset;
 }
 
+
+void FilamentViewer::clearAssets() {
+  Log("Clearing all assets");
+  mtx.lock();
+  int i = 0;
+  for (auto asset : _assets) {
+    _sceneAssetLoader->remove(asset);
+    Log("Cleared asset %d", i);
+    i++;
+  }
+  _assets.clear();
+  mtx.unlock();
+}
+
 void FilamentViewer::removeAsset(SceneAsset *asset) {
   mtx.lock();
   _sceneAssetLoader->remove(asset);
-  _view->setCamera(_mainCamera);
+  // todo - what if we are using a camera from this asset?
+  
   bool erased = false;
   for (auto it = _assets.begin(); it != _assets.end();) {
     if (*it == asset) {

ios/src/FilamentViewer.hpp

@@ -57,6 +57,8 @@ namespace polyvox {
             SceneAsset* loadGlb(const char* const uri);
             SceneAsset* loadGltf(const char* const uri, const char* relativeResourcePath);
             void removeAsset(SceneAsset* asset);
+            // removes all add assets from the current scene
+            void clearAssets();
 
             void updateViewportAndCameraProjection(int height, int width, float scaleFactor);
             void render();

ios/src/SceneAsset.cpp

@@ -31,7 +31,9 @@ SceneAsset::SceneAsset(FilamentAsset *asset, Engine *engine,
   Log("Created animation buffers for %d", _embeddedAnimationStatus.size());
 }
 
-SceneAsset::~SceneAsset() { _asset = nullptr; }
+SceneAsset::~SceneAsset() { 
+  // we defer all destructor work to SceneAssetLoader so we don't need to do anything here
+}
 
 void SceneAsset::applyWeights(float *weights, int count) {
   RenderableManager &rm = _engine->getRenderableManager();
@@ -110,6 +112,19 @@ void SceneAsset::stopAnimation(int index) {
   _embeddedAnimationStatus[index].started = false;
 }
 
+// void SceneAsset:swapTexture() { 
+//     materialInstance = material2.createInstance()
+//     baseColor = loadTexture(filament.engine, context.resources, R.drawable.wall_tex_at, TextureType.COLOR)
+//     normal = loadTexture(filament.engine, context.resources,R.drawable.wall_tex_n,TextureType.NORMAL)
+//     ao = loadTexture(filament.engine, context.resources,R.drawable.wall_tex_ao,TextureType.DATA)
+//     roughnessMetallic = loadTexture(filament.engine, context.resources,R.drawable.wall_tex_ms,TextureType.DATA)
+//     val rm = filament.engine.renderableManager
+//     val sampler = TextureSampler()
+//     sampler.anisotropy = 8.0f
+//     material.setParameter("baseColorIndex",0)
+//     material.setParameter("baseColorMap",baseColor,sampler)
+// }
+
 void SceneAsset::updateEmbeddedAnimations() {
   auto now = high_resolution_clock::now();
   for (auto &status : _embeddedAnimationStatus) {

ios/src/SceneAssetLoader.cpp

@@ -115,9 +115,10 @@ SceneAsset *SceneAssetLoader::fromGlb(const char *uri) {
 }
 
 void SceneAssetLoader::remove(SceneAsset *asset) {
-  _resourceLoader->evictResourceData();
   _scene->removeEntities(asset->_asset->getEntities(),
                          asset->_asset->getEntityCount());
+  _resourceLoader->evictResourceData();
   _assetLoader->destroyAsset(asset->_asset);
+  delete asset;
 }
 } // namespace polyvox