How to properly transfer texture coordinates in geometric shaders in Shader #130 version?

[mirr...@gmail.com]

env is win10 osg3.6.4 GTX1660

osg::ref_ptr<osg::Program> createProgram()

{

    osg::Program *program = new osg::Program();

    program->addShader(new osg::Shader(osg::Shader::VERTEX,vertSource));

    program->addShader(new osg::Shader(osg::Shader::GEOMETRY,geomSource));

    program->addShader(new osg::Shader(osg::Shader::FRAGMENT,fragSource));

    program->setParameter(GL_GEOMETRY_VERTICES_OUT_EXT, 3);

    program->setParameter(GL_GEOMETRY_INPUT_TYPE_EXT, GL_TRIANGLES);

    program->setParameter(GL_GEOMETRY_OUTPUT_TYPE_EXT,  GL_TRIANGLES  );

    return program;

}

[Glenn Waldron]

What error are you getting?

I do see an undefined "samplerY" in there.

[mirr...@gmail.com]

sorry, the screenshot is wrong. It should be  samplerU.

I'm basically not sure how to get texture coordinates into  Shader::FRAGMENT  in Geometric shaders.

[Trajce Nikolov NICK]

Hi,

have a look here MuseOpenIG/Plugin-GPUVegetation at master · CCSI-CSSI/MuseOpenIG · GitHub ... This is code for generating forests with geometry shaders. It might give you better clue

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trajce nikolov nick

[Chris Hanson]

I just wanted to add that it is a popular opinion among the industry that Geometry Shaders were ill-conceived architecturally and suffer unsolvable performance-blocking issues. There are alternatives of various forms which have their own complexities, but just in case you run into perf problems with GS, you should be aware of the situation. Here's a discussion (related to Vulkan, but architecturally the same situation) that a lot of people seem to cite:

https://www.reddit.com/r/vulkan/comments/91q0qx/do_geometry_shaders_still_suck/

To view this discussion on the web visit https://groups.google.com/d/msgid/osg-users/CAO-%2BzinF1fFZnS3QkT9VTgScKQ4XVF1oVB_L9vQRZT-reQvAEA%40mail.gmail.com.

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Chris 'Xenon' Hanson, omo sanza lettere. Xe...@AlphaPixel.com http://www.alphapixel.com/

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