View Full Version : Tessellation Callback Functions

01-20-2006, 10:41 AM

I'm trying to tessellate a shape with the glu library, and I've spent the best part of the day trying to get a few lines of code to work:-

GLUtesselation *tobj = gluNewTess();
gluTessCallback(tobj, GLU_TESS_BEGIN, glBegin);
gluTessCallback(tobj, GLU_TESS_VERTEX, glVertex3dv);
gluTessCallback(tobj, GLU_TESS_END, glEnd);

When I try to run this the compiler says that there is an invalid conversion on the third line from void(*)(unsigned int) to void(*)() and another on the forth line from void(*)(void*) to void(*)().

I know that most people put their callbacks in seperate functions, but I don't see any reason for me to do that since I'm using three one-line callbacks. I have tried putting them into functions, but to no avail.

-Can't understand it. Any help would be very much appreciated.



01-20-2006, 12:51 PM
They decided not to have entry points for all possible flavors of callbacks, so you need to cast all of them to void(CALLBACK*)(void), like
gluTessCallback(tobj, GLU_TESS_VERTEX, (void(CALLBACK*)(void))glVertex3fv).

CALLBACK is defined when you include windows.h (usually defined as __stdcall, but it's probably a good idea to use the macro just in case).