Method initializeGL

example/resize_image.cpp:93–126

}

void ImageWidget::initializeGL()
{
    // setup opengl
    glDisable(GL_LIGHTING);

    // create the OpenGL/OpenCL shared context
    context_ = compute::opengl_create_shared_context();

    // get gpu device
    compute::device gpu = context_.get_device();
    std::cout << "device: " << gpu.name() << std::endl;

    // setup command queue
    queue_ = compute::command_queue(context_, gpu);

    // allocate image on the device
    compute::image_format format =
        compute::qt_qimage_format_to_image_format(qt_image_.format());

    image_ = compute::image2d(
        context_, qt_image_.width(), qt_image_.height(), format, CL_MEM_READ_ONLY
    );

    // transfer image to the device
    compute::qt_copy_qimage_to_image2d(qt_image_, image_, queue_);

    // setup image sampler (use CL_FILTER_NEAREST to disable linear interpolation)
    sampler_ = compute::image_sampler(
        context_, false, CL_ADDRESS_NONE, CL_FILTER_LINEAR
    );

    // build resize program
    program_ = compute::program::build_with_source(source, context_);
}

void ImageWidget::resizeGL(int width, int height)
{