Function cmd_update_buffer 

pub unsafe fn cmd_update_buffer(
    device: &Device,
    command_buffer: CommandBuffer,
    dst_buffer: Buffer,
    dst_offset: DeviceSize,
    data: &[u8],
) -> Result<(), CallError>

Call vkCmdUpdateBuffer using this context’s cached function pointer.

Errors

Reports a missing command, invalid slice lengths/counts or a native error.

Safety

The context and all handles must be live and belong to the same Vulkan implementation/device. Meet vkCmdUpdateBuffer valid usage, enabled API/extension/feature, pointer-chain lifetime, callback compatibility and host/GPU synchronization requirements. Native resources require explicit destruction after completion.

Byte slices determine native byte counts. The caller must also satisfy the command’s data alignment, format, size-multiple and stride requirements; a byte slice alone does not establish those properties.

Khronos reference: vkCmdUpdateBuffer