在Vulkan中将SDL_image用于纹理时出现意外行为

Question

我设法加载了jpg图像并将其用作vulkan中的纹理，但是不同的图像给出了不同的结果，有些图像工作得很好，而另一些图像映射得不好。

这是与图像加载和格式转换有关的代码块：

void Vulkan::createTextureImage()
{
    SDL_Surface *tempImg;
    SDL_RWops *rwop;

    rwop = SDL_RWFromFile("Textures/img1.jpg", "rb");
    tempImg = IMG_LoadJPG_RW(rwop);



    SDL_Surface *image = SDL_ConvertSurfaceFormat(tempImg, SDL_PIXELFORMAT_ABGR8888, 0);

    VkDeviceSize imageSize = image->format->BytesPerPixel * image->h * image->w;


    if (!image)
    {
        throw std::runtime_error("failed to load texture image!");
    }

    VkImage stagingImage;
    VkDeviceMemory staingImageMemory;

    createImage(
        image->w, image->h, 
        VK_FORMAT_R8G8B8A8_UNORM, 
        VK_IMAGE_TILING_LINEAR, 
        VK_IMAGE_USAGE_TRANSFER_SRC_BIT, 
        VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, 
        stagingImage, 
        staingImageMemory);

    std::cout << "the image size is " << imageSize << std::endl;

    void * data;
    vkMapMemory(device, staingImageMemory, 0, imageSize, 0, &data);
    memcpy(data, image->pixels, (size_t)imageSize);
    vkUnmapMemory(device, staingImageMemory);

    createImage(
        image->w, image->h,
        VK_FORMAT_R8G8B8A8_UNORM,
        VK_IMAGE_TILING_OPTIMAL,
        VK_IMAGE_USAGE_TRANSFER_DST_BIT | VK_IMAGE_USAGE_SAMPLED_BIT,
        VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT,
        textureImage,
        textureImageMemory);

    transitionImageLayout(stagingImage, VK_FORMAT_R8G8B8A8_UNORM,
        VK_IMAGE_LAYOUT_PREINITIALIZED,
        VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL);
    transitionImageLayout(textureImage, VK_FORMAT_R8G8B8A8_UNORM,
        VK_IMAGE_LAYOUT_PREINITIALIZED,
        VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL);

    copyImage(stagingImage, textureImage, image->w, image->h);

    transitionImageLayout(textureImage, VK_FORMAT_R8G8B8A8_UNORM,
        VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
        VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);

}

我所做的唯一修改是翻转纹理的V分量以固定镜像图像

图片结果：

这个地图不好

虽然它应该显示这样的东西

Answer 1

看起来sdl的行距与vulkan想要的行距不匹配。

取而代之的是，您可以使用缓冲区通过vkCmdCopyBufferToImage从临时存储器中复制映像，而不是使用图像复制到暂存映像，而是在VkBufferImageCopy结构中显式传递行间距。