CURRENT RASTER POSITION

E.g.,

glRasterPos2f(1.0, 2.1999);

has the z and w values defaulted to 1.0 and 0.0, resp.

glGetFloatv(GL_CURRENT_RASTER_POSITION, pointv)

returns the current raster position in the vector pointv which is an array for storing 4 GLfoats.

The current raster position is subject to the model view and perspective matrix transformations, like glVertices.
-- After transformation, the current raster position will be clipped.

If the position is clipped away, then it is invalid.
-- Use glGetBooleanv() to check if the current raster position is valid.