add setter for frame interval, separate FilamentController initialization from widget

ios/src/FilamentViewer.cpp

@@ -149,12 +149,12 @@ FilamentViewer::FilamentViewer(void *layer, LoadResource loadResource,
   Log("Engine created");
 
   _renderer = _engine->createRenderer();
-
-  _renderer->setDisplayInfo({.refreshRate = 60.0f,
+  float fr = 60.0f;
+  _renderer->setDisplayInfo({.refreshRate = fr,
                              .presentationDeadlineNanos = (uint64_t)0,
                              .vsyncOffsetNanos = (uint64_t)0});
   Renderer::FrameRateOptions fro;
-  fro.interval = 60;
+  fro.interval = 1 / fr;
   _renderer->setFrameRateOptions(fro);
 
   _scene = _engine->createScene();
@@ -247,6 +247,13 @@ static constexpr float4 sFullScreenTriangleVertices[3] = {
 
 static const uint16_t sFullScreenTriangleIndices[3] = {0, 1, 2};
 
+void FilamentViewer::setFrameInterval(float frameInterval) {
+  Renderer::FrameRateOptions fro;
+  fro.interval = frameInterval;
+  _renderer->setFrameRateOptions(fro);
+  Log("Set framerate interval to %f", frameInterval);
+}
+
 void FilamentViewer::createImageRenderable() {
 
   if (_imageEntity)
@@ -618,7 +625,7 @@ void FilamentViewer::loadIbl(const char *const iblPath) {
   }
 }
 
-void FilamentViewer::render() {
+void FilamentViewer::render(uint64_t frameTimeInNanos) {
 
   if (!_view || !_mainCamera || !_swapChain) {
     Log("Not ready for rendering");
@@ -637,7 +644,7 @@ void FilamentViewer::render() {
   }
 
   // Render the scene, unless the renderer wants to skip the frame.
-  if (_renderer->beginFrame(_swapChain)) {
+  if (_renderer->beginFrame(_swapChain, frameTimeInNanos)) {
     _renderer->render(_view);
     _renderer->endFrame();
   }

ios/src/FilamentViewer.hpp

@@ -61,7 +61,8 @@ namespace polyvox {
             void clearAssets();
 
             void updateViewportAndCameraProjection(int height, int width, float scaleFactor);
-            void render();
+            void render(uint64_t frameTimeInNanos);
+            void setFrameInterval(float interval);
             
             bool setFirstCamera(SceneAsset* asset);
             bool setCamera(SceneAsset* asset, const char* nodeName);

ios/src/PolyvoxFilamentApi.cpp

@@ -69,9 +69,17 @@ extern "C" {
   }
 
   void render(
-    void* viewer
+    void* viewer,
+    uint64_t frameTimeInNanos
   ) {
-    ((FilamentViewer*)viewer)->render();
+    ((FilamentViewer*)viewer)->render(frameTimeInNanos);
+  }
+
+  void set_frame_interval(
+    void* viewer,
+    float frameInterval
+  ) {
+    ((FilamentViewer*)viewer)->setFrameInterval(frameInterval);
   }
 
   void destroy_swap_chain(void* viewer) {

ios/src/PolyvoxFilamentApi.hpp

@@ -16,8 +16,9 @@ void remove_ibl(void* viewer);
 void* load_glb(void* viewer, const char* assetPath);
 void* load_gltf(void* viewer, const char* assetPath, const char* relativePath);
 bool set_camera(void* viewer, void* asset, const char* nodeName);
-void render(void* viewer);
+void render(void* viewer, uint64_t frameTimeInNanos);
 void destroy_swap_chain(void* viewer);
+void set_frame_interval(void* viewer, float interval);
 void* get_renderer(void* viewer);
 void update_viewport_and_camera_projection(void* viewer, int width, int height, float scaleFactor);