- Remove outdated references to glReadPixels & OpenGL.
- Rename GPUPickState.{gl => gpu}
- Add doc-string for MAXPICKELEMS.
- Use doxygen comments & other minor doc-string improvements.
- Remove outdated references to glReadPixels & OpenGL.
- Rename GPUPickState.{gl => gpu}
- Add doc-string for MAXPICKELEMS.
- Use doxygen comments & other minor doc-string improvements.