bugle-wireframe — force rendering in wireframe mode
wireframe filter-set overrides the
polygon mode, setting it to GL_LINES. This is
useful for visualising the triangulation of models.
Run-time activation and deactivation are not fully supported.
Display lists that alter the polygon mode will cause problems.
As with any filter-set that modifies OpenGL state, it will break complex rendering techniques like render-to-vertex-buffer.
Texturing is generally disabled to make the lines more visible, but fragment programs will nevertheless continue to apply textures.