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.
@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
I’ve heard that using
mix()instead (or whatever GDShader calls that GLSL function) can be more performant, since it doesn’t branch. Is that true?@PoolloverNathan Afaik that is true, yes! mix is the same instruction for all fragments, so if you can replace a branching if with a mix that should be an improvement
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