void draw_cut_style_cap_callback (int iloop,
double cap[][3],
float face_color[3],
gleDouble cut_vector[3],
gleDouble bisect_vector[3],
double norms[][3],
int frontwards)
{
int i;
if (face_color != NULL) C3F (face_color);
if (frontwards) {
/* if lighting is on, specify the endcap normal */
if (cut_vector != NULL) {
/* if normal pointing in wrong direction, flip it. */
if (cut_vector[2] < 0.0) {
VEC_SCALE (cut_vector, -1.0, cut_vector);
}
N3F_D (cut_vector);
}
BGNPOLYGON();
for (i=0; i<iloop; i++) {
V3F_D (cap[i], i, FRONT_CAP);
}
ENDPOLYGON();
} else {
/* if lighting is on, specify the endcap normal */
if (cut_vector != NULL) {
/* if normal pointing in wrong direction, flip it. */
if (cut_vector[2] > 0.0)
{
VEC_SCALE (cut_vector, -1.0, cut_vector);
}
N3F_D (cut_vector);
}
/* the sense of the loop is reversed for backfacing culling */
BGNPOLYGON();
for (i=iloop-1; i>-1; i--) {
V3F_D (cap[i], i, BACK_CAP);
}
ENDPOLYGON();
}
}
void draw_angle_style_front_cap (int ncp, /* number of contour points */
gleDouble bi[3], /* biscetor */
gleDouble point_array[][3]) /* polyline */
{
int j;
#ifdef OPENGL_10
GLUtriangulatorObj *tobj;
#endif /* OPENGL_10 */
if (bi[2] < 0.0) {
VEC_SCALE (bi, -1.0, bi);
}
#ifdef GL_32
/* old-style gl handles concave polygons no problem, so the code is
* simple. New-style gl is a lot more tricky. */
/* draw the end cap */
BGNPOLYGON ();
N3F (bi);
for (j=0; j<ncp; j++) {
V3F (point_array[j], j, FRONT_CAP);
}
ENDPOLYGON ();
#endif /* GL_32 */
#ifdef OPENGL_10
N3F(bi);
tobj = gluNewTess ();
gluTessCallback (tobj, GLU_BEGIN, glBegin);
gluTessCallback (tobj, GLU_VERTEX, glVertex3dv);
gluTessCallback (tobj, GLU_END, glEnd);
gluBeginPolygon (tobj);
for (j=0; j<ncp; j++) {
gluTessVertex (tobj, point_array[j], point_array[j]);
}
gluEndPolygon (tobj);
gluDeleteTess (tobj);
#endif /* OPENGL_10 */
}
static void
draw_cut_style_cap_callback (int iloop,
double cap[][3],
float face_color[3],
gleDouble cut_vector[3],
gleDouble bisect_vector[3],
double norms[][3],
int frontwards)
{
#ifdef DELICATE_TESSELATOR
int i;
int is_colinear;
double *previous_vertex = 0x0;
double *first_vertex = 0x0;
#endif /* DELICATE_TESSELATOR */
#ifdef OPENGL_10
GLUtriangulatorObj *tobj;
tobj = gluNewTess ();
gluTessCallback (tobj, GLU_BEGIN, glBegin);
gluTessCallback (tobj, GLU_VERTEX, glVertex3dv);
gluTessCallback (tobj, GLU_END, glEnd);
#endif /* OPENGL_10 */
if (face_color != NULL) C3F (face_color);
if (frontwards) {
/* if lighting is on, specify the endcap normal */
if (cut_vector != NULL) {
/* if normal pointing in wrong direction, flip it. */
if (cut_vector[2] < 0.0) {
VEC_SCALE (cut_vector, -1.0, cut_vector);
}
N3F_D (cut_vector);
}
#ifdef GL_32
BGNPOLYGON();
for (i=0; i<iloop; i++) {
V3F_D (cap[i], i, FRONT_CAP);
}
ENDPOLYGON();
#endif /* GL_32 */
#ifdef OPENGL_10
/* If you have a tesselator that is happy with anything,
* including degenerate points, colinear segments, etc.
* then define this. Otherwise, pick one of the others.
*
* I beleive that the stock SGI tesselator is "lenient",
* despite explicit disclaimers in the documentation.
* (circa 1995).
*
* The Mesa tesselator is not at all forgiving of
* degenerate points.
* (circa 1997-1998)
*/
#ifdef LENIENT_TESSELATOR
gluBeginPolygon (tobj);
for (i=0; i<iloop; i++) {
gluTessVertex (tobj, cap[i], cap[i]);
}
gluEndPolygon (tobj);
#endif /* LENIENT_TESSELATOR */
#ifdef DELICATE_TESSELATOR
gluBeginPolygon (tobj);
first_vertex = 0x0;
previous_vertex = cap[iloop-1];
for (i=0; i<iloop-1; i++) {
COLINEAR (is_colinear, previous_vertex, cap[i], cap[i+1]);
if (!is_colinear) {
gluTessVertex (tobj, cap[i], cap[i]);
previous_vertex = cap[i];
if (!first_vertex) first_vertex = previous_vertex;
}
}
if (!first_vertex) first_vertex = cap[0];
COLINEAR (is_colinear, previous_vertex, cap[iloop-1], first_vertex);
if (!is_colinear) gluTessVertex (tobj, cap[iloop-1], cap[iloop-1]);
gluEndPolygon (tobj);
#endif /* DELICATE_TESSELATOR */
#endif /* OPENGL_10 */
} else {
/* if lighting is on, specify the endcap normal */
if (cut_vector != NULL) {
/* if normal pointing in wrong direction, flip it. */
if (cut_vector[2] > 0.0) {
VEC_SCALE (cut_vector, -1.0, cut_vector);
}
N3F_D (cut_vector);
}
/* the sense of the loop is reversed for backfacing culling */
#ifdef GL_32
BGNPOLYGON();
for (i=iloop-1; i>-1; i--) {
V3F_D (cap[i], i, BACK_CAP);
}
ENDPOLYGON();
#endif /* GL_32 */
#ifdef OPENGL_10
#ifdef LENIENT_TESSELATOR
gluBeginPolygon (tobj);
for (i=iloop-1; i>-1; i--) {
gluTessVertex (tobj, cap[i], cap[i]);
}
gluEndPolygon (tobj);
#endif /* LENIENT_TESSELATOR */
#ifdef DELICATE_TESSELATOR
gluBeginPolygon (tobj);
first_vertex = 0x0;
previous_vertex = cap[0];
for (i=iloop-1; i>0; i--) {
COLINEAR (is_colinear, previous_vertex, cap[i], cap[i-1]);
if (!is_colinear) {
gluTessVertex (tobj, cap[i], cap[i]);
previous_vertex = cap[i];
if (!first_vertex) first_vertex = previous_vertex;
}
}
if (!first_vertex) first_vertex = cap[iloop-1];
COLINEAR (is_colinear, previous_vertex, cap[0], first_vertex);
if (!is_colinear) gluTessVertex (tobj, cap[0], cap[0]);
gluEndPolygon (tobj);
#endif /* DELICATE_TESSELATOR */
#endif /* OPENGL_10 */
}
#ifdef OPENGL_10
gluDeleteTess (tobj);
#endif /* OPENGL_10 */
}
/* ARGSUSED4 */
static void draw_cut_style_cap_callback (int iloop,
double cap[][3],
float face_color[3],
gleDouble cut_vector[3],
gleDouble bisect_vector[3],
double norms[][3],
int frontwards)
{
int i;
#ifdef OPENGL_10
GLUtriangulatorObj *tobj;
tobj = gluNewTess ();
gluTessCallback (tobj, GLU_BEGIN, (void (CALLBACK*)()) glBegin);
gluTessCallback (tobj, GLU_VERTEX, (void (CALLBACK*)()) glVertex3dv);
gluTessCallback (tobj, GLU_END, (void (CALLBACK*)()) glEnd);
#endif /* OPENGL_10 */
if (face_color != NULL) C3F (face_color);
if (frontwards) {
/* if lighting is on, specify the endcap normal */
if (cut_vector != NULL) {
/* if normal pointing in wrong direction, flip it. */
if (cut_vector[2] < 0.0) {
VEC_SCALE (cut_vector, -1.0, cut_vector);
}
N3F_D (cut_vector);
}
#ifdef GL_32
BGNPOLYGON();
for (i=0; i<iloop; i++) {
V3F_D (cap[i], i, FRONT_CAP);
}
ENDPOLYGON();
#endif /* GL_32 */
#ifdef OPENGL_10
gluBeginPolygon (tobj);
for (i=0; i<iloop; i++) {
gluTessVertex (tobj, cap[i], cap[i]);
}
gluEndPolygon (tobj);
#endif /* OPENGL_10 */
} else {
/* if lighting is on, specify the endcap normal */
if (cut_vector != NULL) {
/* if normal pointing in wrong direction, flip it. */
if (cut_vector[2] > 0.0) {
VEC_SCALE (cut_vector, -1.0, cut_vector);
}
N3F_D (cut_vector);
}
/* the sense of the loop is reversed for backfacing culling */
#ifdef GL_32
BGNPOLYGON();
for (i=iloop-1; i>-1; i--) {
V3F_D (cap[i], i, BACK_CAP);
}
ENDPOLYGON();
#endif /* GL_32 */
#ifdef OPENGL_10
gluBeginPolygon (tobj);
for (i=iloop-1; i>-1; i--) {
gluTessVertex (tobj, cap[i], cap[i]);
}
gluEndPolygon (tobj);
#endif /* OPENGL_10 */
}
#ifdef OPENGL_10
gluDeleteTess (tobj);
#endif /* OPENGL_10 */
}
