[GEM-dev] Ressources when alpha canal of [colorRGB] is 0
Jack
jack at rybn.org
Sat Apr 5 12:26:45 CEST 2008
You are right !
The next time that I will think more :)
Thanx for your answer.
++
Jack
Le 4 avr. 08 à 20:38, cyrille henry a écrit :
>
>
> Jack a écrit :
>> Yep, i know ;)
>> But why use ressource when alpha channel = 0 ? Is there a good
>> reason ?
>
> lot's!
>
> -you can use gemlist_info to get information from the curent
> transformation matrix in order to trigger other part of your patch
>
> -with 1 gemhead, you can change the color many time and draw many
> primitive.
>
> -you may need to simulate the use of this resources without
> displaing anything.
>
> -the way it works now is logic.
>
> -...
>
> cyrille
>
>
>> ++
>> Jack
>> Le 4 avr. 08 à 18:43, chris clepper a écrit :
>>> Just feed the 0..1 going into colorRGB right inlet into the gemhead.
>>>
>>> On Fri, Apr 4, 2008 at 11:42 AM, Jack <jack at rybn.org
>>> <mailto:jack at rybn.org>> wrote:
>>>
>>> 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
>>>> <mailto: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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>>>>
>>>>
>>>
>>>
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