[GEM-dev] [ pd-gem-Feature Requests-2612731 ] glsl_geometry

[Matthias Neuenhofer]

>
>> but before it worked i had to comment out line 173-176 in   
>> glsl_geometry.ccp
>> got the error "cannot load shader now" didn´t really understand why
>
> because you tried to load the shader when no openGL context existed,  
> and glew was not yet initialized. loading of shaders is deferred  
> till rendering really starts, so it probably shouldn't bail out as  
> an error.
in this case i get "cannot load shader now! deferring till later..."  
and when the rendering starts the shader worked
>
>
> however, initialized glew is crucial for shaders, as we don't know  
> whether the system actually supports openGL-2.0 (or 2.1 for geom- 
> shaders) without it.
> just uncommenting the checks is a bad idea, if you want to not have  
> crashes on the majority of gfx-cards out there...
did another try !GLEW_VERSION_2_0 && !GLEW_ARB_geometry_shader4 work  
¿? GLEW_VERSION_3_0 gives also the error
GemWindow Activate err = 0
GEM: GLEW version 1.5.1
GEM: Start rendering
on mac osx 10.5.6

Matthias
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