updateTexture method

Implementation

Future<void> updateTexture(FlutterAngleTexture texture, [WebGLTexture? sourceTexture]) async {
  if(_disposed) return;
  if (sourceTexture != null) {
    _rawOpenGl.glClearColor(0.0, 0.0, 0.0, 0.0);
    _rawOpenGl.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
    _rawOpenGl.glViewport(0, 0, (texture.options.width*texture.options.dpr).toInt(),( texture.options.height*texture.options.dpr).toInt());
    _worker?.renderTexture(sourceTexture, isFBO: Platform.isAndroid);
    _rawOpenGl.glFinish();
  }

  // If we have an iOS EGL surface created from IOSurface, use it
  if (_useSurface && texture.surfaceId != nullptr) {
    _libEGL!.eglSwapBuffers(_display, texture.surfaceId!);
  }
  else{
    _rawOpenGl.glBindFramebuffer(GL_FRAMEBUFFER, 0);
    if(Platform.isIOS){
      _rawOpenGl.glFlush();
    }
    assert(_activeFramebuffer != null, 'There is no active FlutterGL Texture to update');
  }

  if (!Platform.isAndroid) {
    await _channel.invokeMethod('textureFrameAvailable',  {"textureId": texture.textureId});
  }
}