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csg objects with projection shadow

Posted on 2006-12-01
1
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Last Modified: 2013-12-06
Hi everyone,
i am trying to make a csg objects with projection shadow
and i got some little problem


it say that the followin line is

glutAddMenuEntry("CSG_A_AND_B", and(cone, sphere));


warning C4047: 'function' : 'void (__cdecl *)(void)' differs in levels of indirection from 'GLUquadricObj *'
cwarning C4047: 'function' : 'void (__cdecl *)(void)' differs in levels of indirection from 'GLUquadricObj *'
error C2095: 'glutAddMenuEntry' : actual parameter has type 'void' : parameter 2
 error C2198: 'glutAddMenuEntry' : too few arguments for call through pointer-to-function

"and" is definded like that:

/* "and" two objects together */
void
and(void (*a) (void), void (*b) (void))
{
  firstInsideSecond(a, b, GL_BACK, GL_NOTEQUAL);

  fixDepth(b);

  firstInsideSecond(b, a, GL_BACK, GL_NOTEQUAL);

  glDisable(GL_STENCIL_TEST);  /* reset things */
}


so that is the problem?

regards,
kimos


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Question by:kimos123
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NovaDenizen earned 100 total points
ID: 18055681
From looking at the glutAddMenuEntry docs  ( http://www.opengl.org/resources/libraries/glut/spec3/node39.html ), you're supposed to pass an integer code as the second parameter.  Instead, you're calling a void function and trying to pass the void value into glutAddMenuEntry's second parameter.  That's a valid construct in certain functional languages, but not in C.

The code should instead look something like this:

#define MY_A_AND_B_CODE 1234
....
void myMenuCallbackFunction(int);
glutCreateMenu(myMenuCallbackFunction);
glutAddMenuEntry("CSG_A_AND_B", MY_A_AND_B_CODE);
....


void myMenuCallbackFunction(int menucode) {
    switch(menucode) {
       ....
        case MY_A_AND_B_CODE:
            and(cone, sphere);
            break;
       ....
    }
}
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