[GEM-dev] Different Alpha Blending Methods in Alpha Object

chris clepper cgclepper at gmail.com
Thu Nov 22 18:42:26 CET 2012


I really thought Jamie added all of that a long time ago.  I know I had
versions with all (or most) of the blend modes.  Obviously, shaders make it
kind of obsolete, so I probably never used the modes after 2006 or so.

On Thu, Nov 22, 2012 at 7:45 AM, Cyrille Henry <ch at chnry.net> wrote:

>
>
> Le 21/11/2012 15:02, Jack a écrit :
>
>  Le 20/11/2012 18:52, Santi a écrit :
>>
>>> Hello,
>>>
>>> i don't know if this is the right place to write, sorry if don't.
>>>
>>> I'm working in a project with PD/Gem and i need more blending methods
>>> than the original Alpha object has. I've modified slightliy the file
>>> alpha.cpp (see atachment) and recompiled Gem. Simply i've add the different
>>> OpenGL blending mehods to the switch in the function funmess(). Some are
>>> working in mi system (Debian Wheezy), others are the same output than
>>> GL_ONE. I like specially GL_ONE_MINUS_SRC_COLOR, it doesn't saturate the
>>> bright pixels like GL_ONE_MINUS_SRC_ALPHA does.
>>>
>>> My question: Is there any reason to not include different alpha blending
>>> methods? the modification i've made is very simple and obvious, so i'm
>>> thinking about why not had made before... do i have lost something?
>>>
>>> Regards and sorry for my english...
>>>
>>> Santi Noreña
>>>
>>>
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>>>
>>
>> Hello,
>>
>> You can use the object [GEMglBlendFunc].
>>
> yes, but i don't see any reason not to include it in the alpha object.
> cheers
> c
>
>  ++
>>
>> Jack
>>
>>
>>
>>
>>
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>>
>>
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