Hello guys,
I have been playing a bit with GLU library in context of 2d graphics. I found
that GLU tessellator
can be improved in regards of the interface with very little code added. As of
standard gluTessVertex
accepts only arrays of double[3] values, which is a bit annoying when one has
arrays of type float[2]
or int[2]. It is quite easy to add more flexible interface in style of:
GLAPI void GLAPIENTRY gluTessVertex2i (GLUtesselator* tess, GLint *location,
GLvoid* data);
GLAPI void GLAPIENTRY gluTessVertex2f (GLUtesselator* tess, GLfloat *location,
GLvoid* data);
GLAPI void GLAPIENTRY gluTessVertex2d (GLUtesselator* tess, GLdouble
*location,GLvoid* data);
GLAPI void GLAPIENTRY gluTessVertex3i (GLUtesselator* tess, GLint *location,
GLvoid* data);
GLAPI void GLAPIENTRY gluTessVertex3f (GLUtesselator* tess, GLfloat
*location,GLvoid* data);
GLAPI void GLAPIENTRY gluTessVertex3d (GLUtesselator* tess, GLdouble
*location,GLvoid* data);
I also found by looking at the tessellation algorithm and docs, that one can
make it more effectively when working
in 2d. Originally the algorithm will project all vertices of a polygon into
same plane. When working in 2d we can skipp
this projection, since we anyway have all vertices in same plane, say Z = 0.
Furthermore it is quite easy to hack GLU
to incorporate this by simply adding new boolean property (say
GLU_TESS_DONT_PROJECT) which can be set by programmer and checked
by algorithm before projection.
Those two addons does not break any previous functionality of GLU so one can
use new library as a drop-in repl.
I have used mesa code for my own GLU dll and if this can be of interest to more
people than me,
I can post patches to this list or maybe entire project code somewhere on the
net.
best regards
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