[PD] GEM: multitexturing in GEM

cyrille henry cyrille.henry at la-kitchen.fr
Thu Jul 12 20:44:49 CEST 2007

it works here.
thanks a lot.


chris clepper a écrit :
> CVS is updated.  Hopefully this won't break anyone's compiles.
> The attached files are a test patch and the shaders.  I will be out of
> town for a few days and not able to work on this again until next
> week.
> On 7/12/07, chris clepper <cgclepper at gmail.com> wrote:
>> I have multitexturing working with GLSL.  While I upload the changes
>> to CVS I can explain how it works.
>> GLSL shaders cannot directly talk to hardware like ARB ones can.  The
>> application side code has to tell the shader which hardware texture
>> unit to use.  Obviously when I compile GEM there is no way in hell to
>> know what the shader variables are going to be named, so another
>> method to tell the shader which unit to use needs to be in place.
>> One solution is to hardcode the names of the sampler variables, but
>> that is kind of a hack.  The one I put in place uses a message to the
>> glsl_program object with the name of the sampler and the texture unit
>> to use.
>> How to use:
>> 1) create gemwin and turn on rendering
>> 2) load shader
>> 3) send a [mySamplerName $1( message to glsl_program
>> 4) load two movies or images
>> 5) set one of the pix_texture units to upload to the same texture unit
>> you told the shader to use with a [texunit $1( message
>> This change should be in CVS soon.  I will post an example patch in a 
>> bit.

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