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

[Matthias Neuenhofer]

hi marius
i also have no praxis with the geometry shader fiddling a bit with  
OpenGL Shader Builder Apple Devs tools.
got my knowledge recently here - clearly arranged
web.engr.oregonstate.edu/~mjb/glman/ClassNotes/geometry_shader.pdf

think should possible set the glProgramParameteriEXT in Pd like draw  
types for polygons …
as i understood the parameter code has add to the glsl_program object  
- or?
should be this for input
GL_POINTS
GL_LINES
GL_LINES_ADJACENCY_EXT
GL_TRIANGLES
GL_TRIANGLES_ADJACENCY_EXT

for output
GL_POINTS
GL_LINE_STRIP
GL_TRIANGLE_STRIP

set the default to TRIANGLES and maximum number of vertices the  
geometry shader will be emitting to 1

when someone can go further with this i will test it
my c++ is just growing since started using pd :)

matthias

Am 26.03.2009 um 18:20 schrieb marius schebella:

> hi matthias,
> thanks for fixing the glew.cpp bug. since I have not really worked  
> with geometry shaders before I have to start from scratch, and would  
> appreciate some example patches, how to link the shader. is it  
> possible to setup the glProgramParameteriEXT functions within Pd?
> greetings from the breeding gem community in salzburg.
> marius.
>
>
> Matthias Neuenhofer wrote:
>> Hi,
>> great to get a start.
>> picked the glsl and glew files from trunk
>> compiled on mac 10.5.6
>> in the glew.ccp was the (char*) missing before malloc
>>  symbolName = (char*)malloc(strlen((const char*)name) + 2);
>> glew.cpp:83: error: invalid conversion from ‘void*’ to ‘char*’
>> vertex and fragment seems working normal even though -GL: invalid  
>> value- appears in pd window
>> the glsl_geometry object didn´t post a shaderID
>> the geometry code needs the glProgramParameteriEXT functions to  
>> declare the shader input and output Primitives types
>> and the count of vertices this have to set parameter have to set  
>> after creating the program but before linking
>> matthias
>> schrieb marius schebella:
>>> Hi,
>>> I see two glsl_geometry files in the svn. but I am not sure which  
>>> version of svn I have to check out? it's not 0.91-3??
>>> has anyone already tested the objects?
>>> Marius.
>>>
>>>
>>> IOhannes m zmoelnig wrote:
>>>> SourceForge.net wrote:
>>>>> Initial Comment:
>>>>> it would be great to add a glsl_geometry object to load geometry  
>>>>> shader.
>>>>> It should be compatible with already existing glsl_vertex and  
>>>>> glsl_fragment object...
>>>> if someone with newer hardware than me feels like trying them  
>>>> out, go ahead...i checked some code in yesterday.
>>>> fgamsdr
>>>> IOhannes
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