无法从缓冲区复制到图像

Question

我有一个尺寸为4096*4096（所以67108864 字节，因为有4 个通道）的图像，我想将其从暂存缓冲区复制到设备本地图像。缓冲区已经存储了数据，并且我已经正确设置了图像屏障，所以现在我想执行复制操作......除非它不起作用。当我调用 vkCmdCopyBufferToImage() 时，验证层给了我这个错误信息 -

IMAGE(ERROR): object: 0x0 type: 6 location: 3903 msgCode: 417333590: vkCmdCopyBufferToImage(): pRegion[0] exceeds buffer size of 67108864 bytes. The spec valid usage text states 'The buffer region specified by each element of pRegions mustbe a region that is contained within srcBuffer' (https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#VUID-vkCmdCopyBufferToImage-pRegions-00171).

我找不到我给它的值有什么问题。我传递给它的VkBufferImageCopy 结构看起来像这样-

        VkBufferImageCopy bufImgCopy;
        bufImgCopy.bufferOffset = 0;
        bufImgCopy.bufferImageHeight = 0;
        bufImgCopy.bufferRowLength = 0;
        bufImgCopy.imageExtent = modelTexture.imgExtents; // 4096 * 4096 * 1
        bufImgCopy.imageOffset = {0, 0, 0};
        bufImgCopy.imageSubresource.aspectMask = modelTexture.subResource.aspectMask; // Colour attachment
        bufImgCopy.imageSubresource.baseArrayLayer = modelTexture.subResource.baseArrayLayer; // 0
        bufImgCopy.imageSubresource.layerCount = VK_REMAINING_ARRAY_LAYERS;
        bufImgCopy.imageSubresource.mipLevel = 0;

我无法弄清楚为什么 api 认为结构指定的大小大于缓冲区大小。图片格式为VK_FORMAT_B8G8R8A8_UNORM。

编辑

这是设置暂存缓冲区的代码-

stageBuf.usage = VK_BUFFER_USAGE_TRANSFER_SRC_BIT;
stageBuf.shareMode = VK_SHARING_MODE_EXCLUSIVE;
stageBuf.bufSize = static_cast<VkDeviceSize>(verts.size() * sizeof(vert) + indices.size() * sizeof(u32)) > modelImage.size ? static_cast<VkDeviceSize>(verts.size() * sizeof(vert) + indices.size() * sizeof(u32)) : modelImage.size;

// filled from the previous struct.
VkBufferCreateInfo info;
info.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
info.pNext = nullptr;
info.flags = 0;
info.queueFamilyIndexCount = bufInfo.qFCount;
info.pQueueFamilyIndices = bufInfo.qFIndices;
info.usage = bufInfo.usage;
info.sharingMode = bufInfo.shareMode;
info.size = bufInfo.bufSize;

if (vkCreateBuffer(device, &info, nullptr, &(bufInfo.buf)) != VK_SUCCESS)
{ //...

VkMemoryRequirements memReqs;
vkGetBufferMemoryRequirements(device, buf, &memReqs);

for (u32 type = 0; type < memProps.memoryTypeCount; ++type)
    if ((memReqs.memoryTypeBits & (1 << type)) &&
        ((memProps.memoryTypes[type].propertyFlags & memFlags) == memFlags)) // The usual things to set buffers up.
    {
        VkMemoryAllocateInfo info;
        info.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
        info.pNext = nullptr;
        info.allocationSize = memReqs.size;
        info.memoryTypeIndex = type;

        if (vkAllocateMemory(device, &info, nullptr, &mem.memory) == VK_SUCCESS)
        { //....

    // All this works perfectly except for the texture copy.
    if (vkBindBufferMemory(device, buf, mem.memory, mem.offset) != VK_SUCCESS)
    { //...

我将这个暂存缓冲区用于顶点缓冲区和索引缓冲区（我已将其作为具有偏移量的单个缓冲区）以及我试图复制到的图像。分配的内存是根据最大数据结构的大小来分配的。

Answer 1

如 cmets 中所述。使用VK_REMAINING_ARRAY_LAYERS 对VkImageSubresourceRange 的layerCount 无效，因此您必须将layerCount 显式设置为实际要复制的层数。