add web folder to native

dart_filament/native/web/src/cpp/DartFilamentWebApi.cpp

@@ -0,0 +1,222 @@
+#include "FlutterFilamentWebApi.h"
+#include "ResourceBuffer.hpp"
+
+#include <thread>
+#include <mutex>
+#include <future>
+#include <iostream>
+
+#define GL_GLEXT_PROTOTYPES
+#include <GL/gl.h>
+#include <GL/glext.h>
+#include <emscripten/emscripten.h>
+#include <emscripten/html5.h>
+#include <emscripten/threading.h>
+#include <emscripten/val.h>
+#include <emscripten/fetch.h>
+
+class PendingCall
+{
+public:
+  PendingCall()
+  {
+  }
+  ~PendingCall() {}
+
+  void Wait()
+  {
+    std::future<int32_t> accumulate_future = prom.get_future();
+    std::cout << "Loaded asset from Flutter of length " << accumulate_future.get() << std::endl;
+  }
+
+  void HandleResponse(void* data, int32_t length)
+  {
+    this->data = data;
+    this->length = length;
+    prom.set_value(length);
+  }
+void* data = nullptr;
+int32_t length = 0;
+
+private:
+  std::mutex mutex_;
+  std::condition_variable cv_;
+  bool notified_ = false;
+  std::promise<int32_t> prom;
+
+};
+
+using emscripten::val;
+
+extern "C"
+{
+
+  extern void loadFlutterAsset(const char* path, void* context); 
+  
+  // 
+  // Since are using -sMAIN_MODULE with -sPTHREAD_POOL_SIZE=1, main will be called when the first worker is spawned
+  //
+  EMSCRIPTEN_KEEPALIVE int main() {
+    return 0;
+  }
+
+  EMSCRIPTEN_KEEPALIVE void flutter_filament_web_load_resource_callback(void* data, int32_t length, void* context) {
+    ((PendingCall*)context)->HandleResponse(data, length);
+  }
+
+  EMSCRIPTEN_KEEPALIVE void flutter_filament_web_set(char* ptr, int32_t offset, int32_t val) {
+    memset(ptr+offset, val, 1);
+  }
+
+  EMSCRIPTEN_KEEPALIVE void flutter_filament_web_set_float(float* ptr, int32_t offset, float val) {
+    ptr[offset] = val;
+  }
+
+  EMSCRIPTEN_KEEPALIVE float flutter_filament_web_get_float(float* ptr, int32_t offset) {
+    return ptr[offset];
+  }
+
+  EMSCRIPTEN_KEEPALIVE double flutter_filament_web_get_double(double* ptr, int32_t offset) {
+    return ptr[offset];
+  }
+
+  EMSCRIPTEN_KEEPALIVE void flutter_filament_web_set_double(double* ptr, int32_t offset, double value) {
+    ptr[offset] = value;
+  }
+
+  EMSCRIPTEN_KEEPALIVE int32_t flutter_filament_web_get_int32(int32_t* ptr, int32_t offset) {
+    return ptr[offset];
+  }
+
+  EMSCRIPTEN_KEEPALIVE void flutter_filament_web_set_int32(int32_t* ptr, int32_t offset, int32_t value) {
+    ptr[offset] = value;
+  }
+
+  EMSCRIPTEN_KEEPALIVE void flutter_filament_web_set_pointer(void** ptr, int32_t offset, void* val) { 
+    ptr[offset] = val;
+  }
+
+  EMSCRIPTEN_KEEPALIVE void* flutter_filament_web_get_pointer(void** ptr, int32_t offset) { 
+    return ptr[offset];
+  }
+
+  EMSCRIPTEN_KEEPALIVE char flutter_filament_web_get(char* ptr, int32_t offset) {
+    return ptr[offset];
+  }
+
+  EMSCRIPTEN_KEEPALIVE void* flutter_filament_web_allocate(int32_t size) {
+    void* allocated = (void*)calloc(size, 1);
+    return allocated;
+  }
+
+  EMSCRIPTEN_KEEPALIVE long flutter_filament_web_get_address(void** out) {
+    return (long)*out;
+  }
+
+  EMSCRIPTEN_KEEPALIVE EMSCRIPTEN_WEBGL_CONTEXT_HANDLE flutter_filament_web_create_gl_context() {
+
+    std::cout << "Creating WebGL context." << std::endl;
+
+    EmscriptenWebGLContextAttributes attr;
+    
+    emscripten_webgl_init_context_attributes(&attr);
+    attr.alpha = EM_FALSE;
+    attr.depth = EM_TRUE;
+    attr.stencil = EM_FALSE;
+    attr.antialias = EM_FALSE;
+    attr.explicitSwapControl = EM_FALSE;
+    attr.preserveDrawingBuffer = EM_FALSE;
+    attr.proxyContextToMainThread = EMSCRIPTEN_WEBGL_CONTEXT_PROXY_ALWAYS;
+    attr.enableExtensionsByDefault = EM_TRUE;
+    attr.renderViaOffscreenBackBuffer = EM_TRUE;
+    attr.majorVersion = 2;
+    
+    auto context = emscripten_webgl_create_context("#canvas", &attr);
+    std::cout << "Created WebGL context " << attr.majorVersion << "." << attr.minorVersion << std::endl;
+
+    auto success = emscripten_webgl_make_context_current((EMSCRIPTEN_WEBGL_CONTEXT_HANDLE)context);
+    if(success != EMSCRIPTEN_RESULT_SUCCESS) {
+      std::cout << "Failed to make WebGL context current"<< std::endl;
+    }
+    emscripten_webgl_make_context_current((EMSCRIPTEN_WEBGL_CONTEXT_HANDLE)NULL);
+    return context;
+  }
+
+  int _lastResourceId = 0;
+
+  ResourceBuffer flutter_filament_web_load_resource(const char* path)
+  {
+    // ideally we should bounce the call to Flutter then wait for callback
+    // this isn't working for large assets though - seems like it's deadlocked
+    // will leave this here commented out so we can revisit later if needed
+    // auto pendingCall = new PendingCall();
+    // loadFlutterAsset(path, (void*)pendingCall);
+    // pendingCall->Wait();
+    // auto rb = ResourceBuffer { pendingCall->data, (int32_t) pendingCall->length, _lastResourceId  } ;
+    _lastResourceId++;
+    // delete pendingCall;
+    // std::cout << "Deleted pending call" << std::endl;
+
+    // emscripten_fetch_attr_t attr;
+    // emscripten_fetch_attr_init(&attr);
+    // attr.onsuccess = [](emscripten_fetch_t* fetch) {
+      
+    // };
+    // attr.onerror = [](emscripten_fetch_t* fetch) {
+      
+    // };
+    // attr.onprogress = [](emscripten_fetch_t* fetch) {
+      
+    // };
+    // attr.onreadystatechange = [](emscripten_fetch_t* fetch) {
+      
+    // };
+    // attr.attributes = EMSCRIPTEN_FETCH_LOAD_TO_MEMORY | EMSCRIPTEN_FETCH_SYNCHRONOUS | EMSCRIPTEN_FETCH_PERSIST_FILE;
+
+    auto pathString = std::string(path);
+    if(pathString.rfind("https://",0) != 0) {
+      pathString = std::string("../../") + pathString;
+    }
+    
+    std::cout << "Fetching from path " << pathString.c_str() << std::endl;
+
+    // auto request = emscripten_fetch(&attr, pathString.c_str());
+    // if(!request) {
+    //   std::cout << "Request failed?" << std::endl;  
+    // }
+    // auto data = malloc(request->numBytes);
+    // memcpy(data, request->data, request->numBytes);
+    // emscripten_fetch_close(request);
+    // return ResourceBuffer { data, (int32_t) request->numBytes, _lastResourceId  } ;
+    void* data = nullptr;
+    int32_t numBytes = 0;
+    
+    void** pBuffer = (void**)malloc(sizeof(void*));
+    int* pNum = (int*) malloc(sizeof(int*));
+    int* pError = (int*)malloc(sizeof(int*));
+    emscripten_wget_data(pathString.c_str(), pBuffer, pNum, pError);
+    data = *pBuffer;
+    numBytes = *pNum;
+    free(pBuffer);
+    free(pNum);
+    free(pError);
+    
+    return ResourceBuffer { data, numBytes, _lastResourceId  } ;   
+  }
+
+  void flutter_filament_web_free_resource(ResourceBuffer rb) {
+    free((void*)rb.data);
+  }
+  
+  EMSCRIPTEN_KEEPALIVE void flutter_filament_web_free(void* ptr) {
+    free(ptr);
+  }
+
+  EMSCRIPTEN_KEEPALIVE void* flutter_filament_web_get_resource_loader_wrapper() {
+    ResourceLoaderWrapper *rlw = (ResourceLoaderWrapper *)malloc(sizeof(ResourceLoaderWrapper));
+    rlw->loadResource = flutter_filament_web_load_resource;
+    rlw->freeResource = flutter_filament_web_free_resource;
+    rlw->owner = nullptr;
+    return rlw;
+  }
+}