opencl - use image object with local memory -

i'm trying program opencl.

there 2 types of memory object. 1 buffer , 1 image.

some blogs , web site,white papers 'image object little bit faster buffer because of cache'.

i'm trying use image object , reason 'clamp', make kernel code more simpler , faster(my opinion)

my question 'is possible use image object , local memory , faster(than using buffer object local memory)?"

data-> image object-> copy local memory -> operations -> write other image object.

as far understood, cannot use async_work_group_copy instruction local memory in case.

so have copy , synchronize manually local memory. make overhead lot.

the real answer "it depends". implementations don't have value in doing async_work_group_copy. image reads may higher latency buffer reads when there cache hit, may better cache behaviour them on architectures. clamping, address calculation , filtering free operations performed dedicated hardware, you'd have shift shader code when using buffers, reduces read latency , may increase throughput.

if going big caching benefits images, local memory may in way. cost of writing it, synchronizing, reading it, calculating addresses , on may cost you.

sadly 1 of things you'll have experiment on target architectures.