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Combined vs individual glClear performance

jgp

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!

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  • +1 Arm Employee Badge in reply to Ben Clark

    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 draws then they will not be combined, and will be a "not free" shader-based clear.

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  • +1 Arm Employee Badge in reply to Ben Clark

    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 draws then they will not be combined, and will be a "not free" shader-based clear.

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