vkDestroyPipeline

To destroy a pipeline, call:

void vkDestroyPipeline(
    VkDevice device,
    VkPipeline pipeline,
    const VkAllocationCallbacks* pAllocator);

device is the logical device that destroys the pipeline.
pipeline is the handle of the pipeline to destroy.
pAllocator controls host memory allocation as described in the Memory Allocation chapter.

All submitted commands that refer to pipeline must have completed execution

If VkAllocationCallbacks were provided when pipeline was created, a compatible set of callbacks must be provided here

If no VkAllocationCallbacks were provided when pipeline was created, pAllocator must be NULL

device must be a valid VkDevice handle

If pipeline is not VK_NULL_HANDLE, pipeline must be a valid VkPipeline handle

If pAllocator is not NULL, pAllocator must be a valid pointer to a valid VkAllocationCallbacks structure

If pipeline is a valid handle, it must have been created, allocated, or retrieved from device