+ const Texture3D &self = *static_cast<const Texture3D *>(this);
+
+ auto level_size = self.get_level_size(level);
+ int layer = (is_array() && dp==1 ? z : -1);
+ synchronize(layer, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, (x==0 && y==0 && z==0 && wd==level_size.x && ht==level_size.y && dp==level_size.z));
+
+ size_t data_size = wd*ht*dp*get_pixel_size(storage_fmt);
+ void *staging = device.get_transfer_queue().prepare_transfer(data_size,
+ [this, level, x, y, z, wd, ht, dp](VkCommandBuffer cmd_buf, VkBuffer staging_buf, size_t src_off){
+ const VulkanFunctions &vk = device.get_functions();
+
+ VkBufferImageCopy region = { };
+ region.bufferOffset = src_off;
+ region.imageSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
+ region.imageSubresource.mipLevel = level;
+ region.imageSubresource.baseArrayLayer = (is_array() ? z : 0);
+ region.imageSubresource.layerCount = (is_array() ? dp : 1);
+ region.imageOffset = { x, y, (is_array() ? 0 : z) };
+ region.imageExtent = { wd, ht, (is_array() ? 1 : dp) };
+ vk.CmdCopyBufferToImage(cmd_buf, staging_buf, handle, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, 1, ®ion);
+ });
+
+ const char *src = static_cast<const char *>(data);
+ copy(src, src+data_size, static_cast<char *>(staging));