[GEM-dev] Ressources when alpha canal of [colorRGB] is 0

[Jack]

Thanx Chris, it was what I thought.
It would be interresting if the gemhead turn off when the alpha  
channel is 0 or not (and why) ?
++

Jack


Le 4 avr. 08 à 18:32, chris clepper a écrit :

> No.  In the alpha chain the geometry is still computed only the  
> pixels are not drawn in the back buffer.  Also, the gemhead has  
> some overhead for setting up the various states and matrices.   
> Turning off the gemhead bypasses everything in the chain.
>
> On Fri, Apr 4, 2008 at 11:20 AM, Jack <jack at rybn.org> wrote:
> Is it the same when the alpha canal of a [colorRGB] is 0 than when
> [gemhead] has received the message 0 :
>
> [gemhead]
> |
> [alpha]
> |
> [colorRGB 1 1 1 0]
> |
> [square]
>
>
> is it the same for the ressources take from the CPU/GPU than :
>
>
> [loadbang]
> |
> |0(
> |
> [gemhead]
> |
> [square]
>
> (The both methods erase the square).
>
> Thanx.
> ++
>
> Jack
>
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