optimize the clear head method from SetData to a CS kernel

[SnowWindSaveYou]

it can improve the performance in most scenarios，
but still an limitation,
it can't work properly on a very large screen (e.g. 4K HUD 3840*2160) due to the buffer counts over the max thread group.
but it can be fixed by split thread size into many dispatches with an index offset.

[happy-turtle]

Thank you! Wow, that really is a huge performance boost.
Can we maybe prevent the maximum screen size by using a two (or later even three-dimensional) number of threads? And then offset by the second dimension. I will try to explain in code comments.

[SnowWindSaveYou]

Thank you! Wow, that really is a huge performance boost. Can we maybe prevent the maximum screen size by using a two (or later even three-dimensional) number of threads? And then offset by the second dimension. I will try to explain in code comments.

i fixed it by using a for loop with buffersize in compute shader.

[SnowWindSaveYou]

i leave first one empty for safer debug, otherwise it's easy to make a infinite loop and make my computer crash

[happy-turtle]

Ah nice, I would still like to try a two-dimensional number of threads though. It would remove those big numbers. I can look at it at the next opportunity

[happy-turtle]

Thanks a lot for this! The whole process is a lot more performant now. I added two-dimensional thread groups and did some cleanup to align more with the other shaders.