manual OpenGL texture instantiation on Android

android/src/main/cpp/FilamentAndroid.cpp

@@ -0,0 +1,26 @@
+#include <android/native_window_jni.h>
+#include <android/native_activity.h>
+
+extern "C" {
+
+  #include "PolyvoxFilamentApi.h"
+
+  const void* create_filament_viewer_android(
+          jobject surface, JNIEnv* env, ResourceLoaderWrapper* loaderWrapper
+          ) {
+    ANativeWindow* window = ANativeWindow_fromSurface(env, surface);
+    return create_filament_viewer(window,loaderWrapper);
+  }
+
+  void create_swap_chain_android(
+    const void* const viewer,
+    jobject surface,
+    JNIEnv* env,
+    uint32_t width,
+    uint32_t height
+  ) {
+    ANativeWindow* window = ANativeWindow_fromSurface(env, surface);
+    create_swap_chain(viewer, window, width, height);
+  }
+  
+}