Godot

5888 readers

31 users here now

Welcome to the programming.dev Godot community!

This is a place where you can discuss about anything relating to the Godot game engine. Feel free to ask questions, post tutorials, show off your godot game, etc.

Make sure to follow the Godot CoC while chatting

We have a matrix room that can be used for chatting with other members of the community here

Other Communities

Rules

Posts need to be in english
Posts with explicit content must be tagged with nsfw
We do not condone harassment inside the community as well as trolling or equivalent behaviour
Do not post illegal materials or post things encouraging actions such as pirating games

We have a four strike system in this community where you get warned the first time you break a rule, then given a week ban, then given a year ban, then a permanent ban. Certain actions may bypass this and go straight to permanent ban if severe enough and done with malicious intent

Wormhole

!roguelikedev@programming.dev

Credits

The icon is a modified version of the official godot engine logo (changing the colors to a gradient and black background)
The banner is from Godot Design

founded 1 year ago

MODERATORS

snowe@programming.dev

Ategon@programming.dev

Feyter@programming.dev

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

submitted 9 hours ago by Smorty@lemmy.blahaj.zone to c/godot@programming.dev

7 comments fedilink hide all child comments

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.

you are viewing a single comment's thread
view the rest of the comments

[–] tracefree@mastodon.gamedev.place 4 points 8 hours ago (2 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 7 hours 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 5 hours 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

Godot

Links

Other Communities

Rules

Wormhole

Credits