add android integration & make iOS API consistent

add pubspec android plugin

update android CMakeLists

add filament android libs for linking

android/src/main/cpp/filament_api.cpp

@@ -0,0 +1,146 @@
+#include "FilamentViewer.hpp"
+#include <android/asset_manager.h>
+#include <android/asset_manager_jni.h>
+#include <android/native_window_jni.h>
+#include <android/log.h>
+#include <android/native_activity.h>
+
+using namespace polyvox;
+
+static AAssetManager* am;
+
+std::vector<AAsset*> _assets;
+uint64_t id = -1;
+
+static polyvox::ResourceBuffer loadResource(const char* name) {
+
+    id++;
+  
+    AAsset *asset = AAssetManager_open(am, name, AASSET_MODE_BUFFER);
+    if(asset == nullptr) {
+      __android_log_print(ANDROID_LOG_VERBOSE, "filament_api", "Couldn't locate asset [ %s ]", name);
+      return polyvox::ResourceBuffer(nullptr, 0, 0);
+    }
+    __android_log_print(ANDROID_LOG_VERBOSE, "filament_api", "Loading asset [ %s ]", name);
+    off_t length = AAsset_getLength(asset);
+    const void * buffer = AAsset_getBuffer(asset);
+    __android_log_print(ANDROID_LOG_VERBOSE, "filament_api", "Read [ %lu ] bytes into buffer", length);
+    _assets.push_back(asset);
+    __android_log_print(ANDROID_LOG_VERBOSE, "filament_api", "Loaded asset [ %s ] of length %zu", name, length);
+    return ResourceBuffer(buffer, length, id);
+
+}
+
+static void freeResource(ResourceBuffer rb) {
+  AAsset_close(_assets.at(rb.id));
+}
+
+extern "C" {
+
+  void load_skybox(void* viewer, const char* skyboxPath, const char* iblPath) {
+    ((FilamentViewer*)viewer)->loadSkybox(skyboxPath, iblPath, am);
+  }
+
+  void load_glb(void* viewer, const char* assetPath) {
+    ((FilamentViewer*)viewer)->loadGlb(assetPath);
+  }
+
+  void load_gltf(void* viewer, const char* assetPath, const char* relativePath) {
+    ((FilamentViewer*)viewer)->loadGltf(assetPath, relativePath);
+  }
+
+  void set_camera(void* viewer, const char* nodeName) {
+    ((FilamentViewer*)viewer)->setCamera(nodeName);
+  }
+
+  void* filament_viewer_new(
+    jobject surface,
+    const char* opaqueShaderPath, 
+    const char* fadeShaderPath,
+    JNIEnv* env,
+    jobject assetManager
+  ) {
+    ANativeWindow* layer = ANativeWindow_fromSurface(env, surface);
+    am = AAssetManager_fromJava(env, assetManager);
+    
+    return new FilamentViewer((void*)layer, opaqueShaderPath, fadeShaderPath, loadResource, freeResource);
+  }
+
+  void render(
+    void* viewer
+  ) {
+    ((FilamentViewer*)viewer)->render();
+  }
+
+  void destroy_swap_chain(void* viewer) {
+    ((FilamentViewer*)viewer)->destroySwapChain();
+  }
+
+  void create_swap_chain(void* viewer, jobject surface, JNIEnv* env) {
+    ANativeWindow* layer = ANativeWindow_fromSurface(env, surface);
+    if(!layer) {
+      __android_log_print(ANDROID_LOG_VERBOSE, "filament_api", "Couldn't get native window from surface");     
+      return;
+    }
+    ((FilamentViewer*)viewer)->createSwapChain(layer);
+  }
+
+  void* get_renderer(void* viewer) {
+    return ((FilamentViewer*)viewer)->getRenderer();
+  }
+
+  void update_viewport_and_camera_projection(void* viewer, int width, int height, float scaleFactor) {
+    return ((FilamentViewer*)viewer)->updateViewportAndCameraProjection(width, height, scaleFactor);
+    
+  }
+
+  void scroll(void* viewer, float x, float y , float z) {
+    return ((FilamentViewer*)viewer)->manipulator->scroll(x, y, z);
+  }
+
+  void grab_begin(void* viewer, int x, int y, bool pan) {
+      __android_log_print(ANDROID_LOG_VERBOSE, "filament_api", "Grab begin at %d %d %d", x, y, pan);     
+    ((FilamentViewer*)viewer)->manipulator->grabBegin(x, y, pan);
+
+  }
+
+  void grab_update(void* viewer, int x, int y) {
+    __android_log_print(ANDROID_LOG_VERBOSE, "filament_api", "Grab update at %d %d %d", x, y);     
+    ((FilamentViewer*)viewer)->manipulator->grabUpdate(x, y);
+  }
+
+  void grab_end(void* viewer) {
+    ((FilamentViewer*)viewer)->manipulator->grabEnd();
+  }
+
+  void apply_weights(void* viewer, float* weights, int count) {
+    ((FilamentViewer*)viewer)->applyWeights(weights, count);
+  }
+
+  void get_target_names(void* viewer, char* meshName, char*** outPtr, int* countPtr ) {
+    StringList names = ((FilamentViewer*)viewer)->getTargetNames(meshName);
+         
+    *countPtr = names.count;
+    
+	  *outPtr = (char**)malloc(sizeof(char*) * names.count);
+
+    __android_log_print(ANDROID_LOG_VERBOSE, "filament_api", "Got %d names", names.count);     
+    
+    for(int i = 0; i < names.count; i++) {
+      std::string as_str(names.strings[i]);      
+      (*outPtr)[i] = (char*)malloc(sizeof(char) * as_str.length());
+	    strcpy((*outPtr)[i], as_str.c_str());
+    }
+  }
+
+  void free_pointer(void** ptr, int size) {
+    for(int i = 0; i < size; i++) {
+      free(ptr[i]);
+    }
+  }
+
+  void release_source_assets(void* viewer) {
+    ((FilamentViewer*)viewer)->releaseSourceAssets();
+  }
+  
+}

android/src/main/cpp/filament_api.h

@@ -0,0 +1,15 @@
+#include "FilamentViewer.hpp"
+#include <android/asset_manager.h>
+#include <android/asset_manager_jni.h>
+#include <android/native_window_jni.h>
+#include <android/log.h>
+
+void load_skybox(void* viewer, const char* skyboxPath, const char* iblPath);
+
+void* filament_viewer_new(
+    void* layer, 
+    const char* opaqueShaderPath, 
+    const char* fadeShaderPath, 
+    void* assetManager
+);
+}