vkUnmapMemory

vkUnmapMemory is a function in the Vulkan graphics API that is used to unmap a previously mapped memory region. Mapping memory allows a Vulkan application to access host-visible memory, such as CPU-accessible memory, for reading or writing data. This function reverses the mapping operation performed by vkMapMemory, making the memory accessible to the Vulkan device again.

When vkMapMemory is called, it returns a pointer to the mapped memory region. The application can then use this pointer to transfer data to or from the memory. After the data transfer is complete, vkUnmapMemory should be called to release the mapping. Failing to unmap memory can lead to resource leaks and performance degradation.

The vkUnmapMemory function takes a VkDevice handle and a VkDeviceMemory handle as parameters. The VkDevice handle represents the Vulkan device, and the VkDeviceMemory handle identifies the memory object that was previously mapped. The function does not return any specific value, but it is crucial to ensure that it is called exactly once for every successful call to vkMapMemory on the same memory object. It is important to note that after calling vkUnmapMemory, the pointer returned by vkMapMemory becomes invalid and should not be dereferenced.