-/* $Id: tess.c,v 1.21 1999/11/11 03:21:43 kendallb Exp $ */
+/* $Id: tess.c,v 1.22 1999/12/06 09:39:34 gareth Exp $ */
/*
* Mesa 3-D graphics library
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
-#include <GL/glu.h>
+#include <math.h>
+
+#include "gluP.h"
#include "tess.h"
#include "tess_macros.h"
#include "tess_grid.h"
#endif
-/*****************************************************************************
- * Internal function prototypes:
- *****************************************************************************/
-
-static void init_callbacks( tess_callbacks_t *callbacks );
-
-static void tess_cleanup( GLUtesselator *tobj );
-static void inspect_current_contour( GLUtesselator *tobj );
-
-void delete_contour( tess_contour_t **contour );
-static void delete_all_contours( GLUtesselator *tobj );
#define TESS_CHECK_ERRORS(t) if ( (t)->error != GLU_NO_ERROR ) goto cleanup
/*****************************************************************************
+ * tess_error_callback
*
- * GLU TESSELLATION FUNCTIONS
+ * Internal error handler. Call the user-registered error callback.
*
+ * 2nd arg changed from 'errno' to 'errnum' since MSVC defines errnum as
+ * a macro (of all things) and thus breaks the build -tjump
*****************************************************************************/
+void tess_error_callback( GLUtesselator *tobj, GLenum errnum )
+{
+ if ( tobj->error == GLU_NO_ERROR )
+ {
+ tobj->error = errnum;
+ }
+
+ if ( tobj->callbacks.errorData != NULL )
+ {
+ ( tobj->callbacks.errorData )( errnum, tobj->data );
+ }
+ else if ( tobj->callbacks.error != NULL )
+ {
+ ( tobj->callbacks.error )( errnum );
+ }
+}
/*****************************************************************************
- * gluNewTess
+ * init_callbacks
*****************************************************************************/
-GLUtesselator* GLAPIENTRY gluNewTess( void )
+static void init_callbacks( tess_callbacks_t *callbacks )
{
- GLUtesselator *tobj;
+ callbacks->begin = ( void (GLCALLBACKP)(GLenum) ) NULL;
+ callbacks->beginData = ( void (GLCALLBACKP)(GLenum, void *) ) NULL;
+ callbacks->edgeFlag = ( void (GLCALLBACKP)(GLboolean) ) NULL;
+ callbacks->edgeFlagData = ( void (GLCALLBACKP)(GLboolean, void *) ) NULL;
+ callbacks->vertex = ( void (GLCALLBACKP)(void *) ) NULL;
+ callbacks->vertexData = ( void (GLCALLBACKP)(void *, void *) ) NULL;
+ callbacks->end = ( void (GLCALLBACKP)(void) ) NULL;
+ callbacks->endData = ( void (GLCALLBACKP)(void *) ) NULL;
+ callbacks->error = ( void (GLCALLBACKP)(GLenum) ) NULL;
+ callbacks->errorData = ( void (GLCALLBACKP)(GLenum, void *) ) NULL;
+ callbacks->combine = ( void (GLCALLBACKP)(GLdouble [3], void *[4],
+ GLfloat [4], void **) ) NULL;
+ callbacks->combineData = ( void (GLCALLBACKP)(GLdouble [3], void *[4],
+ GLfloat [4], void **,
+ void *) ) NULL;
+}
-#ifdef DEBUG
- if ( getenv( "GLU_TESS_DBG_LEVEL" ) ) {
- tess_dbg_level = atoi( getenv( "GLU_TESS_DBG_LEVEL" ) );
- } else {
- tess_dbg_level = DBG_LEVEL_BASE;
- }
-#endif
- MSG( 15, "-> gluNewTess()\n" );
+/*****************************************************************************
+ * find_normal
+ *****************************************************************************/
+static GLenum find_normal( GLUtesselator *tobj )
+{
+ tess_contour_t *contour = tobj->current_contour;
+ tess_vertex_t *va, *vb, *vc;
+ GLdouble a[3], b[3], c[3];
- tobj = malloc( sizeof(GLUtesselator) );
- if ( tobj == NULL ) {
- return NULL;
+ MSG( 15, " --> find_normal( tobj:%p )\n", tobj );
+
+ if ( contour == NULL ) { return GLU_ERROR; }
+
+ va = contour->vertices;
+ vb = va->next;
+
+ /* If va and vb are the same point, keep looking for a different vertex. */
+
+ while ( IS_EQUAL_3DV( va->coords, vb->coords ) && ( vb != va ) ) {
+ vb = vb->next;
}
- init_callbacks( &tobj->callbacks );
+ if ( vb == va ) {
+ /* FIXME: What error is this? */
+ tess_error_callback( tobj, GLU_TESS_ERROR7 );
+ }
- tobj->boundary_only = GL_FALSE;
- tobj->winding_rule = GLU_TESS_WINDING_ODD;
- tobj->tolerance = 0.0;
+ SUB_3V( a, vb->coords, va->coords );
- tobj->plane.normal[X] = 0.0;
- tobj->plane.normal[Y] = 0.0;
- tobj->plane.normal[Z] = 0.0;
- tobj->plane.dist = 0.0;
+ for ( vc = vb->next; vc != va; vc = vc->next )
+ {
+ SUB_3V( b, vc->coords, va->coords );
- tobj->contour_count = 0;
- tobj->contours = tobj->last_contour = NULL;
- tobj->current_contour = NULL;
+ CROSS_3V( c, a, b );
- CLEAR_BBOX_2DV( tobj->mins, tobj->maxs );
+ if ( ! IS_ZERO_3DV( c ) )
+ {
+ MSG( 15, " using (%.2f,%.2f) -> (%.2f,%.2f) -> (%.2f,%.2f)\n",
+ va->coords[X], va->coords[Y],
+ vb->coords[X], vb->coords[Y],
+ vc->coords[X], vc->coords[Y] );
- tobj->vertex_count = 0;
- tobj->sorted_vertices = NULL;
-#if 0
- tobj->grid = NULL;
-#endif
- tobj->cvc_lists = NULL;
- tobj->data = NULL;
- tobj->edge_flag = GL_FALSE;
- tobj->label = 0;
+ COPY_3V( contour->plane.normal, c );
+ NORMALIZE_3DV( contour->plane.normal );
- tobj->error = GLU_NO_ERROR;
+ contour->plane.dist = - DOT_3V( contour->plane.normal,
+ va->coords );
- MSG( 15, "<- gluNewTess() tobj:%p\n", tobj );
- return tobj;
-}
+ MSG( 15, " <-- find_normal( tobj:%p ) n: (%.2f, %.2f, %.2f)\n", tobj, contour->plane.normal[X], contour->plane.normal[Y], contour->plane.normal[Z] );
+ return GLU_NO_ERROR;
+ }
+ }
+ /* FIXME: What error is this? */
+ tess_error_callback( tobj, GLU_TESS_ERROR7 );
+ return GLU_ERROR;
+}
/*****************************************************************************
- * gluDeleteTess
+ * twice_contour_area
+ *
+ * Calculate the twice the signed area of the given contour. Used to
+ * determine the contour's orientation amongst other things.
*****************************************************************************/
-void GLAPIENTRY gluDeleteTess( GLUtesselator *tobj )
+GLdouble twice_contour_area( tess_contour_t *contour )
{
- MSG( 15, "-> gluDeleteTess( tobj:%p )\n", tobj );
+ tess_vertex_t *vertex = contour->vertices;
+ GLdouble area, x, y;
+
+ area = 0.0;
+
+ x = vertex->v[X];
+ y = vertex->v[Y];
+
+ vertex = vertex->next;
- if ( ( tobj->error == GLU_NO_ERROR ) && ( tobj->contour_count > 0 ) )
+ do
{
- /* gluEndPolygon was not called. */
- tess_error_callback( tobj, GLU_TESS_ERROR3 );
+ area += ( (vertex->v[X] - x) * (vertex->next->v[Y] - y) -
+ (vertex->v[Y] - y) * (vertex->next->v[X] - x) );
+ vertex = vertex->next;
}
+ while ( vertex != contour->vertices );
- /* Delete all internal structures. */
- tess_cleanup( tobj );
- free( tobj );
-
- MSG( 15, "<- gluDeleteTess()\n" );
+ return area;
}
-
/*****************************************************************************
- * gluTessBeginPolygon
+ * project_current_contour
+ *
+ * Project the contour's vertices onto the tessellation plane. We perform
+ * a complex rotation here to allow non-axis-aligned tessellation normals.
*****************************************************************************/
-void GLAPIENTRY gluTessBeginPolygon( GLUtesselator *tobj, void *polygon_data )
+static void project_current_contour( GLUtesselator *tobj )
{
- MSG( 15, "-> gluTessBeginPolygon( tobj:%p data:%p )\n", tobj, polygon_data );
+ tess_contour_t *current = tobj->current_contour;
+ tess_vertex_t *vertex;
+ GLdouble zaxis[3] = { 0.0, 0.0, 1.0 }, znormal[3], xnormal[3];
+ GLdouble dot, rotx, roty;
+ GLint i;
- tobj->error = GLU_NO_ERROR;
+ MSG( 15, " --> project_current_contour( tobj:%p )\n", tobj );
- if ( tobj->current_contour != NULL )
+ if ( current == NULL ) { return; }
+
+ /* Rotate the plane normal around the y-axis. */
+
+ znormal[X] = current->plane.normal[X];
+ znormal[Y] = 0.0;
+ znormal[Z] = current->plane.normal[Z];
+
+ dot = DOT_3V( znormal, zaxis );
+ current->roty = roty = acos( dot );
+
+ /* Rotate the plane normal around the x-axis. */
+
+ xnormal[X] = cos( roty ) * znormal[X] - sin( roty ) * znormal[Z];
+ xnormal[Y] = znormal[Y];
+ xnormal[Z] = sin( roty ) * znormal[X] + cos( roty ) * znormal[Z];
+
+ dot = DOT_3V( xnormal, zaxis );
+ current->rotx = rotx = acos( dot );
+
+ for ( vertex = current->vertices, i = 0;
+ i < current->num_vertices; vertex = vertex->next, i++ )
{
- /* gluEndPolygon was not called. */
- tess_error_callback( tobj, GLU_TESS_ERROR3 );
- tess_cleanup( tobj );
+ tess_plane_t *plane = ¤t->plane;
+ GLdouble proj[3], yrot[3], xrot[3];
+
+ /* FIXME: This needs a cleanup, 'cos I'm sure it's inefficient. */
+
+ proj[X] = vertex->coords[X] - plane->dist * plane->normal[X];
+ proj[Y] = vertex->coords[Y] - plane->dist * plane->normal[Y];
+ proj[Z] = vertex->coords[Z] - plane->dist * plane->normal[Z];
+
+ yrot[X] = cos( roty ) * proj[X] - sin( roty ) * proj[Z];
+ yrot[Y] = proj[Y];
+ yrot[Z] = sin( roty ) * proj[X] + cos( roty ) * proj[Z];
+
+ xrot[X] = yrot[X];
+ xrot[Y] = cos( rotx ) * yrot[Y] - sin( rotx ) * yrot[Z];
+ xrot[Z] = sin( rotx ) * yrot[Y] + cos( rotx ) * yrot[Z];
+
+ vertex->v[X] = xrot[X];
+ vertex->v[Y] = xrot[Y];
+
+ ACC_BBOX_2V( vertex->v, tobj->mins, tobj->maxs );
+ ACC_BBOX_2V( vertex->v, current->mins, current->maxs );
}
- tobj->vertex_count = 0;
- tobj->data = polygon_data;
- tobj->edge_flag = GL_FALSE;
- tobj->label = 0;
+ current->area = twice_contour_area( current );
+ current->orientation = ( current->area >= 0.0 ) ? GLU_CCW : GLU_CW;
- MSG( 15, "<- gluTessBeginPolygon( tobj:%p data:%p )\n", tobj, polygon_data );
-}
+ MSG( 15, " area: %.2f orientation: %s\n",
+ current->area, ( current->orientation == GLU_CCW ) ? "CCW" : "CW" );
+ MSG( 15, " <-- project_current_contour( tobj:%p )\n", tobj );
+}
/*****************************************************************************
- * gluTessBeginContour
+ * save_current_contour
*****************************************************************************/
-void GLAPIENTRY gluTessBeginContour( GLUtesselator *tobj )
+static GLenum save_current_contour( GLUtesselator *tobj )
{
- MSG( 15, " -> gluTessBeginContour( tobj:%p )\n", tobj );
- TESS_CHECK_ERRORS( tobj );
+ tess_contour_t *current = tobj->current_contour;
+ tess_vertex_t *vertex;
+ GLint i;
- if ( tobj->current_contour != NULL )
+ if ( current == NULL ) { return GLU_ERROR; }
+
+ if ( tobj->contours == NULL )
{
- /* gluTessEndContour was not called. */
- tess_error_callback( tobj, GLU_TESS_ERROR4 );
- return;
- }
+ tobj->contours = tobj->last_contour = current;
+ current->next = current->prev = NULL;
- tobj->current_contour = malloc( sizeof(tess_contour_t) );
- if ( tobj->current_contour == NULL ) {
- tess_error_callback( tobj, GLU_OUT_OF_MEMORY );
- return;
+ tobj->orientation = current->orientation;
}
+ else
+ {
+ current->prev = tobj->last_contour;
- COPY_3V( tobj->current_contour->plane.normal, tobj->plane.normal );
- tobj->current_contour->plane.dist = tobj->plane.dist;
-
- tobj->current_contour->area = 0.0;
- tobj->current_contour->orientation = GLU_UNKNOWN;
-
- tobj->current_contour->label = 0;
- tobj->current_contour->winding = 0;
+ tobj->last_contour->next = current;
+ tobj->last_contour = current;
- tobj->current_contour->rotx = tobj->current_contour->roty = 0.0;
+ current->next = NULL;
+ }
- CLEAR_BBOX_2DV( tobj->current_contour->mins,
- tobj->current_contour->maxs );
+ for ( vertex = current->vertices, i = 0;
+ i < current->num_vertices; vertex = vertex->next, i++ )
+ {
+ vertex->edge_flag = GL_TRUE;
+ }
- tobj->current_contour->vertex_count = 0;
- tobj->current_contour->vertices =
- tobj->current_contour->last_vertex = NULL;
+ current->type = GLU_UNKNOWN;
- tobj->current_contour->reflex_vertices = NULL;
- tobj->current_contour->cross_vertices = hashtable_init( HT_DEFAULT_SIZE );
+ tobj->num_contours++;
+ tobj->current_contour = NULL;
- cleanup:
- MSG( 15, " <- gluTessBeginContour( tobj:%p )\n", tobj );
- return;
+ return GLU_NO_ERROR;
}
-
/*****************************************************************************
- * gluTessVertex
+ * inspect_current_contour
*****************************************************************************/
-void GLAPIENTRY gluTessVertex( GLUtesselator *tobj, GLdouble coords[3],
- void *vertex_data )
+static void inspect_current_contour( GLUtesselator *tobj )
{
- tess_contour_t *current = tobj->current_contour;
- tess_vertex_t *last_vertex;
+ tess_contour_t *current = tobj->current_contour;
+ GLdouble origin[3] = { 0.0, 0.0, 0.0 };
+ GLboolean calc_normal = GL_FALSE;
- MSG( 15, " -> gluTessVertex( tobj:%p coords:(%.2f,%.2f,%.2f) )\n", tobj, coords[0], coords[1], coords[2] );
- TESS_CHECK_ERRORS( tobj );
+ MSG( 15, " --> inspect_current_contour( tobj:%p )\n", tobj );
- if ( current == NULL )
+ if ( current->num_vertices < 3 )
{
- /* gluTessBeginContour was not called. */
- tess_error_callback( tobj, GLU_TESS_ERROR2 );
+ MSG( 15, " count %d < 3, deleting\n", current->num_vertices );
+ delete_contour( &tobj->current_contour );
return;
}
- tobj->vertex_count++;
+ current->last_vertex->next = current->vertices;
+ current->vertices->prev = current->last_vertex;
- last_vertex = current->last_vertex;
+ MSG( 15, " current normal: (%.2f, %.2f, %.2f)\n", current->plane.normal[X], current->plane.normal[Y], current->plane.normal[Z] );
- if ( last_vertex == NULL )
+ if ( IS_EQUAL_3DV( current->plane.normal, origin ) )
{
- last_vertex = malloc( sizeof(tess_vertex_t) );
- if ( last_vertex == NULL ) {
- tess_error_callback( tobj, GLU_OUT_OF_MEMORY );
+ /* We haven't been given a normal, so let's take a guess. */
+ if ( find_normal( tobj ) == GLU_ERROR ) {
return;
}
- current->vertices = last_vertex;
- current->last_vertex = last_vertex;
+ COPY_3V( tobj->plane.normal, current->plane.normal );
+ tobj->plane.dist = current->plane.dist;
- last_vertex->index = -1;
- last_vertex->data = vertex_data;
+ calc_normal = GL_TRUE;
+ }
- last_vertex->coords[X] = coords[X];
- last_vertex->coords[Y] = coords[Y];
- last_vertex->coords[Z] = coords[Z];
+ project_current_contour( tobj );
- last_vertex->side = 0.0;
- last_vertex->label = 0;
- last_vertex->mark = 0;
+ if ( calc_normal && ( tobj->current_contour->orientation == GLU_CW ) )
+ {
+ MSG( 15, " oops, let's try that again...\n" );
- last_vertex->next = NULL;
- last_vertex->previous = NULL;
+ /*
+ * FIXME: We've used a reflex angle to calculate the normal. At
+ * the moment, we simply reverse the normal and re-project the
+ * contour, but this is sloooow...
+ */
+ NEG_3V( tobj->plane.normal );
+ NEG_3V( tobj->current_contour->plane.normal );
- current->vertex_count++;
+ project_current_contour( tobj );
}
- else
- {
- tess_vertex_t *vertex;
-
- vertex = malloc( sizeof(tess_vertex_t) );
- if ( vertex == NULL ) {
- tess_error_callback( tobj, GLU_OUT_OF_MEMORY );
- return;
- }
- vertex->index = -1;
- vertex->data = vertex_data;
+ if ( save_current_contour( tobj ) == GLU_ERROR ) {
+ return;
+ }
- vertex->coords[X] = coords[X];
- vertex->coords[Y] = coords[Y];
- vertex->coords[Z] = coords[Z];
+ MSG( 15, " <-- inspect_current_contour( tobj:%p )\n", tobj );
+}
- vertex->side = 0.0;
- vertex->label = 0;
- vertex->mark = 0;
+/*****************************************************************************
+ * reverse_contour
+ *****************************************************************************/
+void reverse_contour( tess_contour_t *contour )
+{
+ tess_vertex_t *current = contour->vertices;
+ GLint i;
- vertex->next = NULL;
- vertex->previous = last_vertex;
+ for ( i = 0 ; i < contour->num_vertices ; i++ )
+ {
+ tess_vertex_t *next = current->next;
+ tess_vertex_t *prev = current->prev;
- current->vertex_count++;
+ current->next = prev;
+ current->prev = next;
- last_vertex->next = vertex;
- current->last_vertex = vertex;
+ current = next;
}
- cleanup:
- MSG( 15, " <- gluTessVertex( tobj:%p )\n", tobj );
- return;
-}
+ contour->orientation =
+ ( contour->orientation == GLU_CCW ) ? GLU_CW : GLU_CCW;
+ contour->last_vertex = contour->vertices->prev;
+}
/*****************************************************************************
- * gluTessEndContour
+ * orient_contours
+ *
+ * Sum the signed areas of the contours, and orient the contours such that
+ * this sum is nonnegative.
*****************************************************************************/
-void GLAPIENTRY gluTessEndContour( GLUtesselator *tobj )
+static void orient_contours( GLUtesselator *tobj )
{
- MSG( 15, " -> gluTessEndContour( tobj:%p )\n", tobj );
- TESS_CHECK_ERRORS( tobj );
+ tess_contour_t *contour = tobj->contours;
+ GLdouble sum = 0.0;
+ GLint i;
- if ( tobj->current_contour == NULL )
+ MSG( 15, " --> orient_contours( tobj:%p )\n", tobj );
+
+ /* Sum the signed areas of all contours */
+ for ( i = 0 ; i < tobj->num_contours ; i++ )
{
- /* gluTessBeginContour was not called. */
- tess_error_callback( tobj, GLU_TESS_ERROR2 );
- return;
+ sum += contour->area;
+ contour = contour->next;
}
- if ( tobj->current_contour->vertex_count > 0 ) {
- inspect_current_contour( tobj );
- } else {
- delete_contour( &tobj->current_contour );
+ MSG( 15, " signed area: %.2f\n", sum );
+
+ if ( sum < -GLU_TESS_EPSILON )
+ {
+ for ( i = 0 ; i < tobj->num_contours ; i++ )
+ {
+ contour->area = ABSD( contour->area );
+ reverse_contour( contour );
+
+ contour = contour->next;
+ }
}
+ else
+ {
+ for ( i = 0 ; i < tobj->num_contours ; i++ )
+ {
+ contour->area = ABSD( contour->area );
- cleanup:
- MSG( 15, " <- gluTessEndContour( tobj:%p )\n", tobj );
- return;
+ contour = contour->next;
+ }
+ }
+
+ tobj->orientation = tobj->contours->orientation;
+
+ MSG( 15, " <-- orient_contours( tobj:%p ) orient: %s\n",
+ tobj, ( tobj->orientation == GLU_CCW ) ? "GLU_CCW" : "GLU_CW" );
}
/*****************************************************************************
- * gluTessEndPolygon
+ * delete_contour
+ *
+ * Delete the given contour and set the pointer to NULL.
*****************************************************************************/
-void GLAPIENTRY gluTessEndPolygon( GLUtesselator *tobj )
+void delete_contour( tess_contour_t **contour )
{
- MSG( 15, "-> gluTessEndPolygon( tobj:%p )\n", tobj );
- TESS_CHECK_ERRORS( tobj );
-
- if ( tobj->current_contour != NULL )
- {
- /* gluTessBeginPolygon was not called. */
- tess_error_callback( tobj, GLU_TESS_ERROR1 );
- return;
- }
- TESS_CHECK_ERRORS( tobj );
-
- /*
- * Ensure we have at least one contour to tessellate. If we have none,
- * clean up and exit gracefully.
- */
- if ( tobj->contour_count == 0 ) {
- tess_cleanup( tobj );
- return;
- }
-
- /* Wrap the contour list. */
+ tess_vertex_t *vertex, *next;
+ GLint i;
- tobj->last_contour->next = tobj->contours;
- tobj->contours->previous = tobj->last_contour;
+ if ( *contour == NULL ) { return; }
- TESS_CHECK_ERRORS( tobj );
+ vertex = (*contour)->vertices;
- /*
- * Before we tessellate the contours, ensure we have the appropriate
- * callbacks registered. We at least need the begin, vertex and end
- * callbacks to do any meaningful work.
- */
- if ( ( ( tobj->callbacks.begin != NULL ) ||
- ( tobj->callbacks.beginData != NULL ) ) &&
- ( ( tobj->callbacks.vertex != NULL ) ||
- ( tobj->callbacks.vertexData != NULL ) ) &&
- ( ( tobj->callbacks.end != NULL ) ||
- ( tobj->callbacks.endData != NULL ) ) )
+ for ( i = 0 ; i < (*contour)->num_vertices ; i++ )
{
- fist_tessellation( tobj );
+ next = vertex->next;
+ free( vertex );
+ vertex = next;
}
- cleanup:
- delete_all_contours( tobj );
- MSG( 15, "<- gluTessEndPolygon( tobj:%p )\n", tobj );
+ free( *contour );
+ *contour = NULL;
}
-
/*****************************************************************************
- * gluTessCallback
+ * delete_all_contours
*****************************************************************************/
-void GLAPIENTRY gluTessCallback( GLUtesselator *tobj, GLenum which,
- void (GLCALLBACKP fn)() )
+static void delete_all_contours( GLUtesselator *tobj )
{
- switch ( which )
+ tess_contour_t *current, *next_contour;
+ GLint i;
+
+ if ( tobj->current_contour != NULL ) {
+ delete_contour( &tobj->current_contour );
+ }
+
+ for ( current = tobj->contours, i = 0 ; i < tobj->num_contours ; i++ )
{
- /* Register the begin callbacks. */
- case GLU_TESS_BEGIN:
- tobj->callbacks.begin = (void (GLCALLBACKP)(GLenum)) fn;
- break;
- case GLU_TESS_BEGIN_DATA:
- tobj->callbacks.beginData = (void (GLCALLBACKP)(GLenum, void *)) fn;
- break;
+ tess_vertex_t *vertex = current->vertices, *next_vertex;
+ GLint j;
- /* Register the edge flag callbacks. */
- case GLU_TESS_EDGE_FLAG:
- tobj->callbacks.edgeFlag = (void (GLCALLBACKP)(GLboolean)) fn;
- break;
- case GLU_TESS_EDGE_FLAG_DATA:
- tobj->callbacks.edgeFlagData =
- (void (GLCALLBACKP)(GLboolean, void *)) fn;
- break;
+ for ( j = 0 ; j < current->num_vertices ; j ++ )
+ {
+ next_vertex = vertex->next;
+ free( vertex );
+ vertex = next_vertex;
+ }
+ next_contour = current->next;
- /* Register the vertex callbacks. */
- case GLU_TESS_VERTEX:
- tobj->callbacks.vertex = (void (GLCALLBACKP)(void *)) fn;
- break;
- case GLU_TESS_VERTEX_DATA:
- tobj->callbacks.vertexData = (void (GLCALLBACKP)(void *, void *)) fn;
- break;
+ free( current );
+ current = next_contour;
+ }
- /* Register the end callbacks. */
- case GLU_TESS_END:
- tobj->callbacks.end = (void (GLCALLBACKP)(void)) fn;
- break;
- case GLU_TESS_END_DATA:
- tobj->callbacks.endData = (void (GLCALLBACKP)(void *)) fn;
- break;
+ tobj->num_contours = tobj->num_vertices = 0;
+ tobj->contours = tobj->last_contour = NULL;
- /* Register the error callbacks. */
- case GLU_TESS_ERROR:
- tobj->callbacks.error = (void (GLCALLBACKP)(GLenum)) fn;
- break;
- case GLU_TESS_ERROR_DATA:
- tobj->callbacks.errorData = (void (GLCALLBACKP)(GLenum, void *)) fn;
- break;
+ CLEAR_BBOX_2DV( tobj->mins, tobj->maxs );
+}
- /* Register the combine callbacks. */
- case GLU_TESS_COMBINE:
- tobj->callbacks.combine =
- (void (GLCALLBACKP)(GLdouble[3], void *[4],
- GLfloat [4], void **)) fn;
- break;
- case GLU_TESS_COMBINE_DATA:
- tobj->callbacks.combineData =
- (void (GLCALLBACKP)(GLdouble[3], void *[4], GLfloat [4],
- void **, void *)) fn;
- break;
- default:
- MSG( 1, " gluTessCallback( tobj:%p which:%d ) invalid enum\n", tobj, which );
- tobj->error = GLU_INVALID_ENUM;
- break;
+/*****************************************************************************
+ * tess_cleanup
+ *****************************************************************************/
+static void tess_cleanup( GLUtesselator *tobj )
+{
+ MSG( 15, " -> tess_cleanup( tobj:%p )\n", tobj );
+
+ if ( tobj->current_contour != NULL ) {
+ delete_contour( &tobj->current_contour );
+ }
+ if ( tobj->contours != NULL ) {
+ delete_all_contours( tobj );
}
+
+ MSG( 15, " <- tess_cleanup( tobj:%p )\n", tobj );
}
/*****************************************************************************
- * gluTessProperty
- *
- * Set the current value of the given property.
+ * tess_msg
*****************************************************************************/
-void GLAPIENTRY gluTessProperty( GLUtesselator *tobj, GLenum which,
- GLdouble value )
+INLINE void tess_msg( GLint level, char *format, ... )
{
- switch ( which )
- {
- case GLU_TESS_BOUNDARY_ONLY:
- tobj->boundary_only = (GLboolean) value;
- break;
+#ifdef DEBUG
+ va_list ap;
+ va_start( ap, format );
- case GLU_TESS_TOLERANCE:
- MSG( 15, " gluTessProperty( tobj:%p ) tolerance: %0.9f\n", tobj, value );
- tobj->tolerance = value;
- break;
+ if ( level <= tess_dbg_level ) {
+ vfprintf( DBG_STREAM, format, ap );
+ fflush( DBG_STREAM );
+ }
- case GLU_TESS_WINDING_RULE:
- tobj->winding_rule = (GLenum) value;
- break;
+ va_end( ap );
+#endif
+}
- default:
- MSG( 1, " gluTessProperty( tobj:%p which:%d ) invalid enum\n", tobj, which );
- tobj->error = GLU_INVALID_ENUM;
- break;
- }
+INLINE void tess_info( char *file, GLint line )
+{
+#ifdef DEBUG
+ fprintf( DBG_STREAM, "%9.9s:%d:\t ", file, line );
+#endif
}
+
/*****************************************************************************
- * gluGetTessProperty
*
- * Return the current value of the given property.
+ * GLU TESSELLATION FUNCTIONS
+ *
*****************************************************************************/
-void GLAPIENTRY gluGetTessProperty( GLUtesselator *tobj, GLenum which,
- GLdouble *value )
+
+
+/*****************************************************************************
+ * gluNewTess
+ *****************************************************************************/
+GLUtesselator* GLAPIENTRY gluNewTess( void )
{
- switch ( which )
- {
- case GLU_TESS_BOUNDARY_ONLY:
- *value = tobj->boundary_only;
- break;
+ GLUtesselator *tobj;
- case GLU_TESS_TOLERANCE:
- *value = tobj->tolerance;
- break;
+#ifdef DEBUG
+ if ( getenv( "GLU_TESS_DBG_LEVEL" ) ) {
+ tess_dbg_level = atoi( getenv( "GLU_TESS_DBG_LEVEL" ) );
+ } else {
+ tess_dbg_level = DBG_LEVEL_BASE;
+ }
+#endif
- case GLU_TESS_WINDING_RULE:
- *value = tobj->winding_rule;
- break;
+ MSG( 15, "-> gluNewTess()\n" );
- default:
- MSG( 1, " gluGetTessProperty( tobj:%p which:%d ) invalid enum\n", tobj, which );
- tobj->error = GLU_INVALID_ENUM;
- break;
+ tobj = malloc( sizeof(GLUtesselator) );
+ if ( tobj == NULL ) {
+ return NULL;
}
-}
+ init_callbacks( &tobj->callbacks );
-/*****************************************************************************
- * gluTessNormal
- *
- * Set the current tessellation normal.
- *****************************************************************************/
-void GLAPIENTRY gluTessNormal( GLUtesselator *tobj, GLdouble x,
- GLdouble y, GLdouble z )
-{
- MSG( 15, " gluTessNormal( tobj:%p n:(%.2f,%.2f,%.2f) )\n", tobj, x, y, z );
+ tobj->winding_rule = GLU_TESS_WINDING_ODD;
+ tobj->boundary_only = GL_FALSE;
+ tobj->tolerance = GLU_TESS_EPSILON;
+ tobj->orientation = GLU_UNKNOWN;
- tobj->plane.normal[X] = x;
- tobj->plane.normal[Y] = y;
- tobj->plane.normal[Z] = z;
-}
+ tobj->data = NULL;
+ tobj->num_contours = 0;
+ tobj->contours = tobj->last_contour = NULL;
+ tobj->current_contour = NULL;
+ CLEAR_BBOX_2DV( tobj->mins, tobj->maxs );
-/*****************************************************************************
- *
- * OBSOLETE TESSELLATION FUNCTIONS
- *
- *****************************************************************************/
+ tobj->num_vertices = 0;
+ tobj->sorted_vertices = NULL;
+#if 0
+ tobj->grid = NULL;
+#endif
+ tobj->edge_flag = GL_FALSE;
+ tobj->label = 0;
-void GLAPIENTRY gluBeginPolygon( GLUtesselator *tobj )
-{
- gluTessBeginPolygon( tobj, NULL );
- gluTessBeginContour( tobj );
-}
+ ZERO_3V( tobj->plane.normal );
+ tobj->plane.dist = 0.0;
-void GLAPIENTRY gluNextContour( GLUtesselator *tobj, GLenum type )
-{
- gluTessEndContour( tobj );
- gluTessBeginContour( tobj );
-}
+ tobj->error = GLU_NO_ERROR;
-void GLAPIENTRY gluEndPolygon( GLUtesselator *tobj )
-{
- gluTessEndContour( tobj );
- gluTessEndPolygon( tobj );
+ MSG( 15, "<- gluNewTess() tobj:%p\n", tobj );
+ return tobj;
}
-
/*****************************************************************************
- * tess_error_callback
- *
- * Internal error handler. Call the user-registered error callback.
- *
- * 2nd arg changed from 'errno' to 'errnum' since MSVC defines errnum as
- * a macro (of all things) and thus breaks the build -tjump
+ * gluDeleteTess
*****************************************************************************/
-
-void tess_error_callback( GLUtesselator *tobj, GLenum errnum )
+void GLAPIENTRY gluDeleteTess( GLUtesselator *tobj )
{
- if ( tobj->error == GLU_NO_ERROR )
- {
- tobj->error = errnum;
- }
+ MSG( 15, "-> gluDeleteTess( tobj:%p )\n", tobj );
- if ( tobj->callbacks.errorData != NULL )
- {
- ( tobj->callbacks.errorData )( errnum, tobj->data );
- }
- else if ( tobj->callbacks.error != NULL )
+ if ( ( tobj->error == GLU_NO_ERROR ) && ( tobj->num_contours > 0 ) )
{
- ( tobj->callbacks.error )( errnum );
+ /* gluEndPolygon was not called. */
+ tess_error_callback( tobj, GLU_TESS_ERROR3 );
}
-}
-
+ /* Delete all internal structures. */
+ tess_cleanup( tobj );
+ free( tobj );
-/*****************************************************************************
- *
- * INTERNAL FUNCTIONS
- *
- *****************************************************************************/
+ MSG( 15, "<- gluDeleteTess()\n" );
+}
/*****************************************************************************
- * init_callbacks
+ * gluTessBeginPolygon
*****************************************************************************/
-static void init_callbacks( tess_callbacks_t *callbacks )
+void GLAPIENTRY gluTessBeginPolygon( GLUtesselator *tobj, void *polygon_data )
{
- callbacks->begin = ( void (GLCALLBACKP)(GLenum) ) NULL;
- callbacks->beginData = ( void (GLCALLBACKP)(GLenum, void *) ) NULL;
- callbacks->edgeFlag = ( void (GLCALLBACKP)(GLboolean) ) NULL;
- callbacks->edgeFlagData = ( void (GLCALLBACKP)(GLboolean, void *) ) NULL;
- callbacks->vertex = ( void (GLCALLBACKP)(void *) ) NULL;
- callbacks->vertexData = ( void (GLCALLBACKP)(void *, void *) ) NULL;
- callbacks->end = ( void (GLCALLBACKP)(void) ) NULL;
- callbacks->endData = ( void (GLCALLBACKP)(void *) ) NULL;
- callbacks->error = ( void (GLCALLBACKP)(GLenum) ) NULL;
- callbacks->errorData = ( void (GLCALLBACKP)(GLenum, void *) ) NULL;
- callbacks->combine = ( void (GLCALLBACKP)(GLdouble [3], void *[4],
- GLfloat [4], void **) ) NULL;
- callbacks->combineData = ( void (GLCALLBACKP)(GLdouble [3], void *[4],
- GLfloat [4], void **,
- void *) ) NULL;
+ MSG( 15, "-> gluTessBeginPolygon( tobj:%p data:%p )\n", tobj, polygon_data );
+
+ tobj->error = GLU_NO_ERROR;
+
+ if ( tobj->current_contour != NULL )
+ {
+ /* gluEndPolygon was not called. */
+ tess_error_callback( tobj, GLU_TESS_ERROR3 );
+ tess_cleanup( tobj );
+ }
+
+ tobj->data = polygon_data;
+ tobj->num_vertices = 0;
+ tobj->edge_flag = GL_FALSE;
+ tobj->label = 0;
+
+ MSG( 15, "<- gluTessBeginPolygon( tobj:%p data:%p )\n", tobj, polygon_data );
}
/*****************************************************************************
- * tess_cleanup
+ * gluTessBeginContour
*****************************************************************************/
-static void tess_cleanup( GLUtesselator *tobj )
+void GLAPIENTRY gluTessBeginContour( GLUtesselator *tobj )
{
- MSG( 15, " -> tess_cleanup( tobj:%p )\n", tobj );
+ MSG( 15, " -> gluTessBeginContour( tobj:%p )\n", tobj );
+ TESS_CHECK_ERRORS( tobj );
- if ( tobj->current_contour != NULL ) {
- delete_contour( &tobj->current_contour );
+ if ( tobj->current_contour != NULL )
+ {
+ /* gluTessEndContour was not called. */
+ tess_error_callback( tobj, GLU_TESS_ERROR4 );
+ return;
}
- if ( tobj->contours != NULL ) {
- delete_all_contours( tobj );
+
+ tobj->current_contour = malloc( sizeof(tess_contour_t) );
+ if ( tobj->current_contour == NULL ) {
+ tess_error_callback( tobj, GLU_OUT_OF_MEMORY );
+ return;
}
- MSG( 15, " <- tess_cleanup( tobj:%p )\n", tobj );
+ COPY_3V( tobj->current_contour->plane.normal, tobj->plane.normal );
+ tobj->current_contour->plane.dist = tobj->plane.dist;
+
+ tobj->current_contour->area = 0.0;
+ tobj->current_contour->orientation = GLU_UNKNOWN;
+
+ tobj->current_contour->label = 0;
+ tobj->current_contour->winding = 0;
+
+ /*tobj->current_contour->rotx = tobj->current_contour->roty = 0.0;*/
+
+ CLEAR_BBOX_2DV( tobj->current_contour->mins,
+ tobj->current_contour->maxs );
+
+ tobj->current_contour->num_vertices = 0;
+ tobj->current_contour->vertices =
+ tobj->current_contour->last_vertex = NULL;
+
+ tobj->current_contour->reflex_vertices = NULL;
+
+ cleanup:
+ MSG( 15, " <- gluTessBeginContour( tobj:%p )\n", tobj );
+ return;
}
/*****************************************************************************
- * inspect_current_contour
+ * gluTessVertex
*****************************************************************************/
-static GLenum find_normal( GLUtesselator *tobj );
-static void project_current_contour( GLUtesselator *tobj );
-static GLenum save_current_contour( GLUtesselator *tobj );
-
-static void inspect_current_contour( GLUtesselator *tobj )
+void GLAPIENTRY gluTessVertex( GLUtesselator *tobj, GLdouble coords[3],
+ void *vertex_data )
{
- tess_contour_t *current = tobj->current_contour;
- GLdouble origin[3] = { 0.0, 0.0, 0.0 };
+ tess_contour_t *current = tobj->current_contour;
+ tess_vertex_t *last_vertex;
- MSG( 15, " -> inspect_current_contour( tobj:%p )\n", tobj );
+ MSG( 15, " -> gluTessVertex( tobj:%p coords:(%.2f,%.2f,%.2f) )\n", tobj, coords[0], coords[1], coords[2] );
+ TESS_CHECK_ERRORS( tobj );
- if ( current->vertex_count < 3 )
+ if ( current == NULL )
{
- MSG( 15, " count %d < 3, deleting\n", current->vertex_count );
- delete_contour( &tobj->current_contour );
+ /* gluTessBeginContour was not called. */
+ tess_error_callback( tobj, GLU_TESS_ERROR2 );
return;
}
- current->last_vertex->next = current->vertices;
- current->vertices->previous = current->last_vertex;
+ tobj->num_vertices++;
+
+ last_vertex = current->last_vertex;
- if ( ( tobj->contours == NULL ) &&
- ( COMPARE_3DV( current->plane.normal, origin ) ) )
+ if ( last_vertex == NULL )
{
- /* We haven't been given a normal, so let's take a guess. */
- if ( find_normal( tobj ) == GLU_ERROR ) {
+ last_vertex = malloc( sizeof(tess_vertex_t) );
+ if ( last_vertex == NULL ) {
+ tess_error_callback( tobj, GLU_OUT_OF_MEMORY );
return;
}
- COPY_3V( tobj->plane.normal, current->plane.normal );
- tobj->plane.dist = current->plane.dist;
- }
- else
- {
- MSG( 15, " normal: (%.2f,%.2f,%.2f)\n", tobj->plane.normal[X], tobj->plane.normal[Y], tobj->plane.normal[Z] );
- }
-
- project_current_contour( tobj );
- if ( save_current_contour( tobj ) == GLU_ERROR ) {
- return;
- }
+ current->vertices = last_vertex;
+ current->last_vertex = last_vertex;
- MSG( 15, " <- inspect_current_contour( tobj:%p )\n", tobj );
-}
+ last_vertex->index = -1;
+ last_vertex->data = vertex_data;
-/*****************************************************************************
- * find_normal
- *****************************************************************************/
-static GLenum find_normal( GLUtesselator *tobj )
-{
- tess_contour_t *contour = tobj->current_contour;
- tess_vertex_t *va, *vb, *vc;
- GLdouble a[3], b[3], c[3];
+ last_vertex->coords[X] = coords[X];
+ last_vertex->coords[Y] = coords[Y];
+ last_vertex->coords[Z] = coords[Z];
- MSG( 15, " -> find_normal( tobj:%p )\n", tobj );
+ last_vertex->v[X] = 0.0;
+ last_vertex->v[Y] = 0.0;
- if ( contour == NULL ) { return GLU_ERROR; }
+ last_vertex->edge_flag = GL_TRUE;
- va = contour->vertices;
- vb = va->next;
+ last_vertex->side = 0.0;
- /* If va and vb are the same point, keep looking for a different vertex. */
+ last_vertex->next = NULL;
+ last_vertex->prev = NULL;
- while ( COMPARE_3DV( va->coords, vb->coords ) && ( vb != va ) ) {
- vb = vb->next;
+ current->num_vertices++;
}
+ else
+ {
+ tess_vertex_t *vertex;
- if ( vb == va ) {
- /* FIXME: What error is this? */
- tess_error_callback( tobj, GLU_TESS_ERROR7 );
- }
+ vertex = malloc( sizeof(tess_vertex_t) );
+ if ( vertex == NULL ) {
+ tess_error_callback( tobj, GLU_OUT_OF_MEMORY );
+ return;
+ }
- SUB_3V( a, vb->coords, va->coords );
+ vertex->index = -1;
+ vertex->data = vertex_data;
- for ( vc = vb->next; vc != va; vc = vc->next )
- {
- SUB_3V( b, vc->coords, va->coords );
+ vertex->coords[X] = coords[X];
+ vertex->coords[Y] = coords[Y];
+ vertex->coords[Z] = coords[Z];
- CROSS3( c, a, b );
+ vertex->v[X] = 0.0;
+ vertex->v[Y] = 0.0;
- if ( ( ABSD( c[X] ) > EQUAL_EPSILON ) ||
- ( ABSD( c[Y] ) > EQUAL_EPSILON ) ||
- ( ABSD( c[Z] ) > EQUAL_EPSILON ) )
- {
- COPY_3V( contour->plane.normal, c );
- NORMALIZE_3DV( contour->plane.normal );
+ vertex->edge_flag = GL_TRUE;
- contour->plane.dist = - DOT3( contour->plane.normal, va->coords );
+ vertex->side = 0.0;
- MSG( 15, " <- find_normal( tobj:%p ) n: (%.2f,%.2f,%.2f)\n", tobj, contour->plane.normal[X], contour->plane.normal[Y], contour->plane.normal[Z] );
- return GLU_NO_ERROR;
- }
+ vertex->next = NULL;
+ vertex->prev = last_vertex;
+
+ current->num_vertices++;
+
+ last_vertex->next = vertex;
+ current->last_vertex = vertex;
}
- /* FIXME: What error is this? */
- tess_error_callback( tobj, GLU_TESS_ERROR7 );
- return GLU_ERROR;
+ cleanup:
+ MSG( 15, " <- gluTessVertex( tobj:%p )\n", tobj );
+ return;
}
+
/*****************************************************************************
- * project_current_contour
+ * gluTessEndContour
*****************************************************************************/
-static GLdouble twice_contour_area( tess_vertex_t *vertex,
- tess_vertex_t *last_vertex );
-
-static void project_current_contour( GLUtesselator *tobj )
+void GLAPIENTRY gluTessEndContour( GLUtesselator *tobj )
{
- tess_contour_t *current = tobj->current_contour;
- tess_vertex_t *vertex;
- GLdouble area;
- GLdouble zaxis[3] = { 0.0, 0.0, 1.0 }, znormal[3], xnormal[3];
- GLdouble dot, rotx, roty;
- GLuint i;
-
- MSG( 15, " -> project_current_contour( tobj:%p )\n", tobj );
-
- if ( current == NULL ) { return; }
-
- /* Rotate the plane normal around the y-axis. */
+ MSG( 15, " -> gluTessEndContour( tobj:%p )\n", tobj );
+ TESS_CHECK_ERRORS( tobj );
- znormal[X] = current->plane.normal[X];
- znormal[Y] = 0.0;
- znormal[Z] = current->plane.normal[Z];
+ if ( tobj->current_contour == NULL )
+ {
+ /* gluTessBeginContour was not called. */
+ tess_error_callback( tobj, GLU_TESS_ERROR2 );
+ return;
+ }
- dot = DOT3( znormal, zaxis );
- current->roty = roty = acos( dot );
+ if ( tobj->current_contour->num_vertices > 0 ) {
+ inspect_current_contour( tobj );
+ } else {
+ delete_contour( &tobj->current_contour );
+ }
- /* Rotate the plane normal around the x-axis. */
+ cleanup:
+ MSG( 15, " <- gluTessEndContour( tobj:%p )\n", tobj );
+ return;
+}
- xnormal[X] = cos( roty ) * znormal[X] - sin( roty ) * znormal[Z];
- xnormal[Y] = znormal[Y];
- xnormal[Z] = sin( roty ) * znormal[X] + cos( roty ) * znormal[Z];
- dot = DOT3( xnormal, zaxis );
- current->rotx = rotx = acos( dot );
+/*****************************************************************************
+ * gluTessEndPolygon
+ *****************************************************************************/
+void GLAPIENTRY gluTessEndPolygon( GLUtesselator *tobj )
+{
+ MSG( 15, "-> gluTessEndPolygon( tobj:%p )\n", tobj );
+ TESS_CHECK_ERRORS( tobj );
- for ( vertex = current->vertices, i = 0;
- i < current->vertex_count; vertex = vertex->next, i++ )
+ if ( tobj->current_contour != NULL )
{
- tess_plane_t *plane = ¤t->plane;
- GLdouble proj[3], yrot[3], xrot[3];
-
- /* FIXME: This needs a cleanup, 'cos I'm sure it's inefficient. */
+ /* gluTessBeginPolygon was not called. */
+ tess_error_callback( tobj, GLU_TESS_ERROR1 );
+ return;
+ }
+ TESS_CHECK_ERRORS( tobj );
- proj[X] = vertex->coords[X] - plane->dist * plane->normal[X];
- proj[Y] = vertex->coords[Y] - plane->dist * plane->normal[Y];
- proj[Z] = vertex->coords[Z] - plane->dist * plane->normal[Z];
+ /*
+ * Ensure we have at least one contour to tessellate. If we have none,
+ * clean up and exit gracefully.
+ */
+ if ( tobj->num_contours == 0 ) {
+ tess_cleanup( tobj );
+ return;
+ }
- yrot[X] = cos( roty ) * proj[X] - sin( roty ) * proj[Z];
- yrot[Y] = proj[Y];
- yrot[Z] = sin( roty ) * proj[X] + cos( roty ) * proj[Z];
+ /* Wrap the contour list. */
- xrot[X] = yrot[X];
- xrot[Y] = cos( rotx ) * yrot[Y] - sin( rotx ) * yrot[Z];
- xrot[Z] = sin( rotx ) * yrot[Y] + cos( rotx ) * yrot[Z];
+ tobj->last_contour->next = tobj->contours;
+ tobj->contours->prev = tobj->last_contour;
- vertex->v[X] = xrot[X];
- vertex->v[Y] = xrot[Y];
+ TESS_CHECK_ERRORS( tobj );
- ACC_BBOX_2V( vertex->v, tobj->mins, tobj->maxs );
- ACC_BBOX_2V( vertex->v, current->mins, current->maxs );
- }
+ /* Orient the contours correctly */
+ orient_contours( tobj );
- area = twice_contour_area( current->vertices,
- current->last_vertex );
- if ( area >= 0.0 )
- {
- current->orientation = GLU_CCW;
- current->area = area;
- }
- else
+ /*
+ * Before we tessellate the contours, ensure we have the appropriate
+ * callbacks registered. We at least need the begin, vertex and end
+ * callbacks to do any meaningful work.
+ */
+ if ( ( ( tobj->callbacks.begin != NULL ) ||
+ ( tobj->callbacks.beginData != NULL ) ) &&
+ ( ( tobj->callbacks.vertex != NULL ) ||
+ ( tobj->callbacks.vertexData != NULL ) ) &&
+ ( ( tobj->callbacks.end != NULL ) ||
+ ( tobj->callbacks.endData != NULL ) ) )
{
- current->orientation = GLU_CW;
- current->area = -area;
+ fist_tessellation( tobj );
}
- MSG( 15, " <- project_current_contour( tobj:%p )\n", tobj );
+ cleanup:
+ delete_all_contours( tobj );
+ MSG( 15, "<- gluTessEndPolygon( tobj:%p )\n", tobj );
}
+
/*****************************************************************************
- * twice_contour_area
+ * gluTessCallback
*****************************************************************************/
-static GLdouble twice_contour_area( tess_vertex_t *vertex,
- tess_vertex_t *last_vertex )
+void GLAPIENTRY gluTessCallback( GLUtesselator *tobj, GLenum which,
+ void (GLCALLBACKP fn)() )
{
- tess_vertex_t *next;
- GLdouble area, x, y;
+ switch ( which )
+ {
+ /* Register the begin callbacks. */
+ case GLU_TESS_BEGIN:
+ tobj->callbacks.begin = (void (GLCALLBACKP)(GLenum)) fn;
+ break;
+ case GLU_TESS_BEGIN_DATA:
+ tobj->callbacks.beginData = (void (GLCALLBACKP)(GLenum, void *)) fn;
+ break;
- area = 0.0;
+ /* Register the edge flag callbacks. */
+ case GLU_TESS_EDGE_FLAG:
+ tobj->callbacks.edgeFlag = (void (GLCALLBACKP)(GLboolean)) fn;
+ break;
+ case GLU_TESS_EDGE_FLAG_DATA:
+ tobj->callbacks.edgeFlagData =
+ (void (GLCALLBACKP)(GLboolean, void *)) fn;
+ break;
- x = vertex->v[X];
- y = vertex->v[Y];
+ /* Register the vertex callbacks. */
+ case GLU_TESS_VERTEX:
+ tobj->callbacks.vertex = (void (GLCALLBACKP)(void *)) fn;
+ break;
+ case GLU_TESS_VERTEX_DATA:
+ tobj->callbacks.vertexData = (void (GLCALLBACKP)(void *, void *)) fn;
+ break;
- vertex = vertex->next;
+ /* Register the end callbacks. */
+ case GLU_TESS_END:
+ tobj->callbacks.end = (void (GLCALLBACKP)(void)) fn;
+ break;
+ case GLU_TESS_END_DATA:
+ tobj->callbacks.endData = (void (GLCALLBACKP)(void *)) fn;
+ break;
- while ( vertex != last_vertex )
- {
- next = vertex->next;
- area +=
- (vertex->v[X] - x) * (next->v[Y] - y) -
- (vertex->v[Y] - y) * (next->v[X] - x);
+ /* Register the error callbacks. */
+ case GLU_TESS_ERROR:
+ tobj->callbacks.error = (void (GLCALLBACKP)(GLenum)) fn;
+ break;
+ case GLU_TESS_ERROR_DATA:
+ tobj->callbacks.errorData = (void (GLCALLBACKP)(GLenum, void *)) fn;
+ break;
- vertex = vertex->next;
+ /* Register the combine callbacks. */
+ case GLU_TESS_COMBINE:
+ tobj->callbacks.combine =
+ (void (GLCALLBACKP)(GLdouble[3], void *[4],
+ GLfloat [4], void **)) fn;
+ break;
+ case GLU_TESS_COMBINE_DATA:
+ tobj->callbacks.combineData =
+ (void (GLCALLBACKP)(GLdouble[3], void *[4], GLfloat [4],
+ void **, void *)) fn;
+ break;
+
+ default:
+ MSG( 1, " gluTessCallback( tobj:%p which:%d ) invalid enum\n", tobj, which );
+ tobj->error = GLU_INVALID_ENUM;
+ break;
}
- return area;
}
/*****************************************************************************
- * save_current_contour
+ * gluTessProperty
+ *
+ * Set the current value of the given property.
*****************************************************************************/
-static GLenum save_current_contour( GLUtesselator *tobj )
+void GLAPIENTRY gluTessProperty( GLUtesselator *tobj, GLenum which,
+ GLdouble value )
{
- tess_contour_t *current = tobj->current_contour;
- tess_vertex_t *vertex;
- GLuint i;
-
- if ( current == NULL ) { return GLU_ERROR; }
-
- if ( tobj->contours == NULL )
- {
- tobj->contours = tobj->last_contour = current;
- current->next = current->previous = NULL;
- }
- else
+ switch ( which )
{
- current->previous = tobj->last_contour;
+ case GLU_TESS_BOUNDARY_ONLY:
+ tobj->boundary_only = (GLboolean) value;
+ break;
- tobj->last_contour->next = current;
- tobj->last_contour = current;
+ case GLU_TESS_TOLERANCE:
+ MSG( 15, " gluTessProperty( tobj:%p ) tolerance: %0.9f\n", tobj, value );
+ tobj->tolerance = value;
+ break;
- current->next = NULL;
- }
+ case GLU_TESS_WINDING_RULE:
+ tobj->winding_rule = (GLenum) value;
+ break;
- for ( vertex = current->vertices, i = 0;
- i < current->vertex_count; vertex = vertex->next, i++ )
- {
- vertex->shadow_vertex = NULL;
- vertex->edge_flag = GL_TRUE;
+ default:
+ MSG( 1, " gluTessProperty( tobj:%p which:%d ) invalid enum\n", tobj, which );
+ tobj->error = GLU_INVALID_ENUM;
+ break;
}
-
- current->type = GLU_UNKNOWN;
-
- tobj->contour_count++;
- tobj->current_contour = NULL;
-
- return GLU_NO_ERROR;
}
+
/*****************************************************************************
- * delete_contour
+ * gluGetTessProperty
*
- * Delete the given contour and set the pointer to NULL.
+ * Return the current value of the given property.
*****************************************************************************/
-void delete_contour( tess_contour_t **contour )
+void GLAPIENTRY gluGetTessProperty( GLUtesselator *tobj, GLenum which,
+ GLdouble *value )
{
- tess_vertex_t *vertex, *next;
- GLuint i;
+ switch ( which )
+ {
+ case GLU_TESS_BOUNDARY_ONLY:
+ *value = tobj->boundary_only;
+ break;
- if ( *contour == NULL ) { return; }
+ case GLU_TESS_TOLERANCE:
+ *value = tobj->tolerance;
+ break;
- vertex = (*contour)->vertices;
+ case GLU_TESS_WINDING_RULE:
+ *value = tobj->winding_rule;
+ break;
- for ( i = 0 ; i < (*contour)->vertex_count ; i++ )
- {
- next = vertex->next;
- free( vertex );
- vertex = next;
+ default:
+ MSG( 1, " gluGetTessProperty( tobj:%p which:%d ) invalid enum\n", tobj, which );
+ tobj->error = GLU_INVALID_ENUM;
+ break;
}
-
- free( *contour );
- *contour = NULL;
}
+
/*****************************************************************************
- * delete_all_contours
+ * gluTessNormal
+ *
+ * Set the current tessellation normal.
*****************************************************************************/
-static void delete_all_contours( GLUtesselator *tobj )
+void GLAPIENTRY gluTessNormal( GLUtesselator *tobj, GLdouble x,
+ GLdouble y, GLdouble z )
{
- tess_contour_t *current, *next_contour;
- GLuint i;
-
- if ( tobj->current_contour != NULL ) {
- delete_contour( &tobj->current_contour );
- }
-
- for ( current = tobj->contours, i = 0 ; i < tobj->contour_count ; i++ )
- {
- tess_vertex_t *vertex = current->vertices, *next_vertex;
- GLuint j;
-
- for ( j = 0 ; j < current->vertex_count ; j ++ )
- {
- next_vertex = vertex->next;
- free( vertex );
- vertex = next_vertex;
- }
- next_contour = current->next;
-
- free( current );
- current = next_contour;
- }
-
- tobj->contour_count = tobj->vertex_count = 0;
- tobj->contours = tobj->last_contour = NULL;
-
- CLEAR_BBOX_2DV( tobj->mins, tobj->maxs );
+ MSG( 15, " gluTessNormal( tobj:%p n:(%.2f,%.2f,%.2f) )\n", tobj, x, y, z );
- ZERO_3V( tobj->plane.normal );
- tobj->plane.dist = 0.0;
+ ASSIGN_3V( tobj->plane.normal, x, y, z );
}
+
/*****************************************************************************
- * tess_msg
+ *
+ * OBSOLETE TESSELLATION FUNCTIONS
+ *
*****************************************************************************/
-INLINE void tess_msg( int level, char *format, ... )
-{
-#ifdef DEBUG
- va_list ap;
- va_start( ap, format );
- if ( level <= tess_dbg_level ) {
- vfprintf( DBG_STREAM, format, ap );
- fflush( DBG_STREAM );
- }
+void GLAPIENTRY gluBeginPolygon( GLUtesselator *tobj )
+{
+ gluTessBeginPolygon( tobj, NULL );
+ gluTessBeginContour( tobj );
+}
- va_end( ap );
-#endif
+void GLAPIENTRY gluNextContour( GLUtesselator *tobj, GLenum type )
+{
+ gluTessEndContour( tobj );
+ gluTessBeginContour( tobj );
}
-INLINE void tess_info( char *file, char *line )
+void GLAPIENTRY gluEndPolygon( GLUtesselator *tobj )
{
-#ifdef DEBUG
- fprintf( DBG_STREAM, "%9.9s:%d:\t ", file, line );
-#endif
+ gluTessEndContour( tobj );
+ gluTessEndPolygon( tobj );
}
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