Graphics, Gaming, and VR forum Combined vs individual glClear performance

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Combined vs individual glClear performance

jgp over 2 years ago

Hi,

Basically I wanted to know if calling glClear with all buffers bits to clear is faster than clearing them all individually.

So:

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

is faster thabn:

glClear(GL_COLOR_BUFFER_BIT);
glClear(GL_DEPTH_BUFFER_BIT);

Cheers!

Top replies

Peter Harris over 2 years ago in reply to Ben Clark +2 verified

It depends on where the clears are. If they are before any glDraw...() calls in the render pass, then they will be combined. On Mali this is a free "start of tile" initialization. If they are after any...

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0 jgp over 2 years ago in reply to Peter Harris

Thanks! This is what I wanted to confirm. The individual glClears are one after the other without any other GL call in between.
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0 jgp over 2 years ago in reply to Peter Harris

Thanks! This is what I wanted to confirm. The individual glClears are one after the other without any other GL call in between.
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