#鸿蒙通关秘籍#如何在HarmonyOS使用XComponent实现EGL/OpenGLES渲染？

要在HarmonyOS中利用XComponent进行EGL/OpenGLES渲染，遵循以下步骤：

1. 在CMAKELists.txt中配置相关依赖项，并编译所需的动态库：

   cmake_minimum_required(VERSION 3.4.1)
   project(XComponent)
   
   set(NATIVERENDER_ROOT_PATH ${CMAKE_CURRENT_SOURCE_DIR})
   include_directories(${NATIVERENDER_ROOT_PATH}
                       ${NATIVERENDER_ROOT_PATH}/include)
   
   add_library(nativerender SHARED
               xxx.cpp
               )
   
   find_library(EGL-lib EGL)
   find_library(GLES-lib GLESv3)
   find_library(libace-lib ace_ndk.z)
   
   target_link_libraries(nativerender PUBLIC ${EGL-lib} ${GLES-lib} ${libace-lib} libace_napi.z.so libc++.a)
   

2. 注册Napi模块并解析XComponent的NativeXComponent：

   static napi_value Init(napi_env env, napi_value exports) {
       napi_property_descriptor desc[] = {
           DECLARE_NAPI_FUNCTION("changeColor", PluginRender::NapiChangeColor),
       };
       NAPI_CALL(env, napi_define_properties(env, exports, sizeof(desc) / sizeof(desc[0]), desc));
       return exports;
   }
   
   static napi_module nativerenderModule = {
       .nm_version = 1,
       .nm_flags = 0,
       .nm_filename = nullptr,
       .nm_register_func = Init,
       .nm_modname = "nativerender",
       .nm_priv = ((void*)0),
       .reserved = {0},
   };
   
   extern "C" __attribute__((constructor)) void RegisterModule(void) {
       napi_module_register(&nativerenderModule);
   }
   

3. 注册XComponent的事件回调：

   {
       OH_NativeXComponent *nativeXComponent = nullptr;
   
       OH_NativeXComponent_Callback callback;
       callback->OnSurfaceCreated = OnSurfaceCreatedCB;
       callback->OnSurfaceChanged = OnSurfaceChangedCB;
       callback->OnSurfaceDestroyed = OnSurfaceDestroyedCB;
       callback->DispatchTouchEvent = DispatchTouchEventCB;
   
       OH_NativeXComponent_RegisterCallback(nativeXComponent, callback);
   }
   

4. 创建EGL/OpenGLES环境，在OnSurfaceCreatedCB回调中初始化OpenGL环境：

   EGLCore* eglCore_;
   uint64_t width_;
   uint64_t height_;
   
   void OnSurfaceCreatedCB(OH_NativeXComponent* component, void* window) {
       int32_t ret = OH_NativeXComponent_GetXComponentSize(component, window, &width_, &height_);
       if (ret == OH_NATIVEXCOMPONENT_RESULT_SUCCESS) {
           eglCore_->GLContextInit(window, width_, height_);
       }
   }
   

5. 在ArkTS侧使用XComponent组件进行渲染开发：

   XComponent({ id: 'xcomponentId1', type: 'surface', libraryname: 'nativerender' })
     .onLoad((context) => {})
     .onDestroy(() => {})