ShaderTrap: Examples of computing a histogram of values

[Mostafa-ashraf19]

This PR Fixes #63. Providing 6 examples of histogram compute shaders.

[afd]

This looks like a very good start!

I have provided detailed feedback on example 1. Please can you propagate that feedback through all the examples?

Example 2 looks incorrect and I have commented on why. I did not look beyond example 2 - so please can you revise the PR in light of my current feedback and let me know when you're ready for another review?

Also: regarding copyright headers, please see this comment that I made on Shiyu's PR:

#66 (review)

If you can follow equivalent advice for yourself that would be great.

[afd]

Thanks for this!

I had made a mistake in the issue description for version 3. I have tried to clarify things in the comments here, with a suggestion on how to rewrite version 3 to use vector operations.

[afd]

Looking good! Next round of changes requested.

[afd]

I'm running out of time for reviewing today, so here's a very preliminary review with some nits about style. Perhaps you could look through the rest of the PR and fix up any similar style nits? I'll do a review of the actual content next week.

[afd]

This is looking good. Example 5 doesn't match the requirements of the issue, but other than that the code all looks good - my comments are mainly on your comments :)

[afd]

One nit - but otherwise looks good to merge assuming the bots pass!

[afd]

Just noticed that the contributors list is not quite right.

[afd]

Thank you for this contribution!