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Update(), Render() Seperation

inbgche · 2007-02-14T12:31:23

In so many practical code, we see the seperation btwn Update and Render(); -Update part : CPU operation -Render part : GPU and Graphic card operation But, is there any reason why many people does not mix these two part. I mean... Traditionally we use this kind of code method, Object::Update() { ... .. UpdateObj1(); UpdateObj2(); UpdateObj3(); ... } Object::Render() { ... .. Render1(); Render2(); Render3(); .. ... } So there was repeation, CPU operation -> Graphics operation bottleneck -> CPU operation -> Graphics operation bottleneck -> CPU operation -> Graphics operation bottleneck -> ... But, if we mixed those two part, I think we could reduce GPU bottleneck. When CPU operation time, we pre-call Graphics operation to reduce delay. like this code, Object::Update() { .... .. UpdateObjectAnimation(); ... renderObj1(); ... .. ... UpdateObj2(); RenderObj2(); .. .. } Maybe, If I use this kind of coding method, my game's performances will imporve. Is it true? I am not sure.... any comments plz~ -_-a

General and Gameplay Programming Programming

Started by inbgche January 30, 2007 12:35 AM

19 comments, last by Bob Janova 17 years, 2 months ago

Bob Janova

769

February 14, 2007 12:31 PM

The two best (imo) reasons to separate updating and rendering:

It lets you run updates and renders at a different speed – useful if your monitor canonly display 60Hz and you want to run your simulation faster.
Many objects' update code depends on other objects (collisions being the most obvious case) so in between updating different objects the world is not in a 'correct' state. If you render objects after their own update but before other things may have happened you can get 'off by one' errors and the game will look glitchy.

Update(), Render() Seperation

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Update(), Render() Seperation

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