[GEM-dev] Ressources when alpha canal of [colorRGB] is 0
cyrille henry
cyrille.henry at la-kitchen.fr
Fri Apr 4 20:38:52 CEST 2008
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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