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GDShader: What's worse? if statement or texture sample? (lemmy.blahaj.zone)

submitted 1 month ago by Smorty@lemmy.blahaj.zone to c/godot@programming.dev

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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

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

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?

[–] tracefree@mastodon.gamedev.place 2 points 1 month ago

@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

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