this post was submitted on 19 Nov 2024
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I have heard many times that if statements in shaders slow down the gpu massively. But I also heard that texture samples are very expensive.

Which one is more endurable? Which one is less impactful?

I am asking, because I need to decide on if I should multiply a value by 0, or put an if statement.

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[–] tracefree@mastodon.gamedev.place 4 points 1 month ago (4 children)

@Smorty Link doesn't load for me and I don't know the answer in general, but one thing I can say is that _sometimes_ if statements aren't an issue at all, which is when the condition evaluates to the same thing for all pixels/fragments. E.g. an "if sin(TIME) < 0.0" costs you almost nothing, whereas "if COLOR.r > 0.5" causes execution to branch and slows you down. But I can't say how that case compares to a texture lookup, I assume it depends on many thing

[–] Kissaki@programming.dev 2 points 1 month ago (1 children)

Link doesn’t load for me

This post has no link. It's a text post.

@Kissaki I saw this post on Mastodon where it only contains the title and a link to the Lemmy post (which didn't work for me), I didn't realize I was actually commenting on a Lemmy post by replying on Mastodon haha

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