developer.download.nvidia.com
Specification for OpenGL's geometry shader APIs. Geometry shaders live in between vertex and fragment shaders in OpenGL's pipeline, and are used to introduce new primitives based on incoming vertices. Detailed documentation and pipeline diagram.
URLs from developer.download.nvidia.com:
URL:
http://developer.download.nvidia.com/books/HTML/gpugems/gpugems_pref01.html
URL:
http://developer.download.nvidia.com/opengl/specs/GL_EXT_geometry_shader4.txt
URL:
http://developer.download.nvidia.com/SDK/10.5/opengl/samples.html
URL:
http://developer.download.nvidia.com/shaderlibrary/webpages/shader_library.html