/* $Id: tess.c,v 1.20.2.9 2000/02/10 17:23:48 brianp Exp $ */ /* * Mesa 3-D graphics library * Version: 3.2 * * Copyright (C) 1999-2000 Brian Paul All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /***************************************************************************** * * GLU 1.3 Polygon Tessellation by Gareth Hughes * *****************************************************************************/ #include #include #include #include #include "gluP.h" #include "tess.h" #include "tess_macros.h" #include "tess_fist.h" #if 0 #include "tess_grid.h" #endif #define TESS_CHECK_ERRORS(t) if ( (t)->error != GLU_NO_ERROR ) goto cleanup #ifdef DEBUG GLint tess_dbg_level; #endif /***************************************************************************** * 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 *****************************************************************************/ 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 ); } } /***************************************************************************** * init_callbacks *****************************************************************************/ static void init_callbacks( tess_callbacks_t *callbacks ) { callbacks->begin = ( void (GLCALLBACKPCAST)(GLenum) ) NULL; callbacks->beginData = ( void (GLCALLBACKPCAST)(GLenum, void *) ) NULL; callbacks->edgeFlag = ( void (GLCALLBACKPCAST)(GLboolean) ) NULL; callbacks->edgeFlagData = ( void (GLCALLBACKPCAST)(GLboolean, void *) ) NULL; callbacks->vertex = ( void (GLCALLBACKPCAST)(void *) ) NULL; callbacks->vertexData = ( void (GLCALLBACKPCAST)(void *, void *) ) NULL; callbacks->end = ( void (GLCALLBACKPCAST)(void) ) NULL; callbacks->endData = ( void (GLCALLBACKPCAST)(void *) ) NULL; callbacks->error = ( void (GLCALLBACKPCAST)(GLenum) ) NULL; callbacks->errorData = ( void (GLCALLBACKPCAST)(GLenum, void *) ) NULL; callbacks->combine = ( void (GLCALLBACKPCAST)(GLdouble [3], void *[4], GLfloat [4], void **) ) NULL; callbacks->combineData = ( void (GLCALLBACKPCAST)(GLdouble [3], void *[4], GLfloat [4], void **, void *) ) NULL; } /***************************************************************************** * 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]; 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; } if ( vb == va ) { /* FIXME: What error is this? */ tess_error_callback( tobj, GLU_TESS_ERROR7 ); } SUB_3V( a, vb->coords, va->coords ); for ( vc = vb->next; vc != va; vc = vc->next ) { SUB_3V( b, vc->coords, va->coords ); CROSS_3V( c, a, b ); 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] ); COPY_3V( contour->plane.normal, c ); NORMALIZE_3DV( contour->plane.normal ); contour->plane.dist = - DOT_3V( contour->plane.normal, va->coords ); 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; } /***************************************************************************** * twice_contour_area * * Calculate the twice the signed area of the given contour. Used to * determine the contour's orientation amongst other things. *****************************************************************************/ GLdouble twice_contour_area( tess_contour_t *contour ) { tess_vertex_t *vertex = contour->vertices; GLdouble area, x, y; area = 0.0; x = vertex->v[X]; y = vertex->v[Y]; vertex = vertex->next; do { 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 ); return area; } /***************************************************************************** * 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. *****************************************************************************/ static void project_current_contour( GLUtesselator *tobj ) { 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; MSG( 15, " --> project_current_contour( tobj:%p )\n", tobj ); 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++ ) { 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 ); } current->area = twice_contour_area( current ); current->orientation = ( current->area >= 0.0 ) ? GLU_CCW : GLU_CW; MSG( 15, " area: %.2f orientation: %s\n", current->area, ( current->orientation == GLU_CCW ) ? "CCW" : "CW" ); MSG( 15, " <-- project_current_contour( tobj:%p )\n", tobj ); } /***************************************************************************** * save_current_contour *****************************************************************************/ static GLenum save_current_contour( GLUtesselator *tobj ) { tess_contour_t *current = tobj->current_contour; tess_vertex_t *vertex; GLint i; if ( current == NULL ) { return GLU_ERROR; } if ( tobj->contours == NULL ) { tobj->contours = tobj->last_contour = current; current->next = current->prev = NULL; tobj->orientation = current->orientation; } else { current->prev = tobj->last_contour; tobj->last_contour->next = current; tobj->last_contour = current; current->next = NULL; } for ( vertex = current->vertices, i = 0; i < current->num_vertices; vertex = vertex->next, i++ ) { vertex->edge_flag = GL_TRUE; } current->type = GLU_UNKNOWN; tobj->num_contours++; tobj->current_contour = NULL; return GLU_NO_ERROR; } /***************************************************************************** * inspect_current_contour *****************************************************************************/ static void inspect_current_contour( GLUtesselator *tobj ) { tess_contour_t *current = tobj->current_contour; GLdouble origin[3] = { 0.0, 0.0, 0.0 }; GLboolean calc_normal = GL_FALSE; MSG( 15, " --> inspect_current_contour( tobj:%p )\n", tobj ); if ( current->num_vertices < 3 ) { MSG( 15, " count %d < 3, deleting\n", current->num_vertices ); delete_contour( &tobj->current_contour ); return; } current->last_vertex->next = current->vertices; current->vertices->prev = current->last_vertex; MSG( 15, " current normal: (%.2f, %.2f, %.2f)\n", current->plane.normal[X], current->plane.normal[Y], current->plane.normal[Z] ); if ( IS_EQUAL_3DV( current->plane.normal, origin ) ) { /* We haven't been given a normal, so let's take a guess. */ if ( find_normal( tobj ) == GLU_ERROR ) { return; } COPY_3V( tobj->plane.normal, current->plane.normal ); tobj->plane.dist = current->plane.dist; calc_normal = GL_TRUE; } project_current_contour( tobj ); if ( calc_normal && ( tobj->current_contour->orientation == GLU_CW ) ) { MSG( 15, " oops, let's try that again...\n" ); /* * 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 ); project_current_contour( tobj ); } if ( save_current_contour( tobj ) == GLU_ERROR ) { return; } MSG( 15, " <-- inspect_current_contour( tobj:%p )\n", tobj ); } /***************************************************************************** * reverse_contour *****************************************************************************/ void reverse_contour( tess_contour_t *contour ) { tess_vertex_t *current = contour->vertices; GLint i; for ( i = 0 ; i < contour->num_vertices ; i++ ) { tess_vertex_t *next = current->next; tess_vertex_t *prev = current->prev; current->next = prev; current->prev = next; current = next; } contour->orientation = ( contour->orientation == GLU_CCW ) ? GLU_CW : GLU_CCW; contour->last_vertex = contour->vertices->prev; } /***************************************************************************** * orient_contours * * Sum the signed areas of the contours, and orient the contours such that * this sum is nonnegative. *****************************************************************************/ static void orient_contours( GLUtesselator *tobj ) { tess_contour_t *contour = tobj->contours; GLdouble sum = 0.0; GLint i; MSG( 15, " --> orient_contours( tobj:%p )\n", tobj ); /* Sum the signed areas of all contours */ for ( i = 0 ; i < tobj->num_contours ; i++ ) { sum += contour->area; contour = contour->next; } 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 ); 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" ); } /***************************************************************************** * delete_contour * * Delete the given contour and set the pointer to NULL. *****************************************************************************/ void delete_contour( tess_contour_t **contour ) { tess_vertex_t *vertex, *next; GLint i; if ( *contour == NULL ) { return; } vertex = (*contour)->vertices; for ( i = 0 ; i < (*contour)->num_vertices ; i++ ) { next = vertex->next; free( vertex ); vertex = next; } free( *contour ); *contour = NULL; } /***************************************************************************** * delete_all_contours *****************************************************************************/ static void delete_all_contours( GLUtesselator *tobj ) { 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++ ) { tess_vertex_t *vertex = current->vertices, *next_vertex; GLint j; for ( j = 0 ; j < current->num_vertices ; j ++ ) { next_vertex = vertex->next; free( vertex ); vertex = next_vertex; } next_contour = current->next; free( current ); current = next_contour; } tobj->num_contours = tobj->num_vertices = 0; tobj->contours = tobj->last_contour = NULL; CLEAR_BBOX_2DV( tobj->mins, tobj->maxs ); } /***************************************************************************** * 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 ); } /***************************************************************************** * tess_msg *****************************************************************************/ INLINE void tess_msg( GLint 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 ); } va_end( ap ); #endif } INLINE void tess_info( char *file, GLint line ) { #ifdef DEBUG fprintf( DBG_STREAM, "%9.9s:%d:\t ", file, line ); #endif } /***************************************************************************** * * GLU TESSELLATION FUNCTIONS * *****************************************************************************/ /***************************************************************************** * gluNewTess *****************************************************************************/ GLUtesselator* GLAPIENTRY gluNewTess( void ) { GLUtesselator *tobj; #ifdef DEBUG if ( getenv( "MESA_TESS_DBG_LEVEL" ) ) { tess_dbg_level = atoi( getenv( "MESA_TESS_DBG_LEVEL" ) ); } else { tess_dbg_level = DBG_LEVEL_BASE; } #endif MSG( 15, "-> gluNewTess()\n" ); tobj = malloc( sizeof(GLUtesselator) ); if ( tobj == NULL ) { return NULL; } init_callbacks( &tobj->callbacks ); tobj->winding_rule = GLU_TESS_WINDING_ODD; tobj->boundary_only = GL_FALSE; tobj->tolerance = GLU_TESS_EPSILON; tobj->orientation = GLU_UNKNOWN; tobj->data = NULL; tobj->num_contours = 0; tobj->contours = tobj->last_contour = NULL; tobj->current_contour = NULL; CLEAR_BBOX_2DV( tobj->mins, tobj->maxs ); tobj->num_vertices = 0; tobj->sorted_vertices = NULL; #if 0 tobj->grid = NULL; #endif tobj->edge_flag = GL_FALSE; tobj->label = 0; ZERO_3V( tobj->plane.normal ); tobj->plane.dist = 0.0; tobj->error = GLU_NO_ERROR; MSG( 15, "<- gluNewTess() tobj:%p\n", tobj ); return tobj; } /***************************************************************************** * gluDeleteTess *****************************************************************************/ void GLAPIENTRY gluDeleteTess( GLUtesselator *tobj ) { MSG( 15, "-> gluDeleteTess( tobj:%p )\n", tobj ); if ( ( tobj->error == GLU_NO_ERROR ) && ( tobj->num_contours > 0 ) ) { /* gluEndPolygon was not called. */ tess_error_callback( tobj, GLU_TESS_ERROR3 ); } /* Delete all internal structures. */ tess_cleanup( tobj ); free( tobj ); MSG( 15, "<- gluDeleteTess()\n" ); } /***************************************************************************** * gluTessBeginPolygon *****************************************************************************/ void GLAPIENTRY gluTessBeginPolygon( GLUtesselator *tobj, void *polygon_data ) { 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 ); } /***************************************************************************** * gluTessBeginContour *****************************************************************************/ void GLAPIENTRY gluTessBeginContour( GLUtesselator *tobj ) { MSG( 15, " -> gluTessBeginContour( tobj:%p )\n", tobj ); TESS_CHECK_ERRORS( tobj ); if ( tobj->current_contour != NULL ) { /* gluTessEndContour was not called. */ tess_error_callback( tobj, GLU_TESS_ERROR4 ); return; } tobj->current_contour = malloc( sizeof(tess_contour_t) ); if ( tobj->current_contour == NULL ) { tess_error_callback( tobj, GLU_OUT_OF_MEMORY ); return; } 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; } /***************************************************************************** * gluTessVertex *****************************************************************************/ void GLAPIENTRY gluTessVertex( GLUtesselator *tobj, GLdouble coords[3], void *vertex_data ) { tess_contour_t *current = tobj->current_contour; tess_vertex_t *last_vertex; MSG( 15, " -> gluTessVertex( tobj:%p coords:(%.2f,%.2f,%.2f) )\n", tobj, coords[0], coords[1], coords[2] ); TESS_CHECK_ERRORS( tobj ); if ( current == NULL ) { /* gluTessBeginContour was not called. */ tess_error_callback( tobj, GLU_TESS_ERROR2 ); return; } tobj->num_vertices++; last_vertex = current->last_vertex; if ( last_vertex == NULL ) { last_vertex = malloc( sizeof(tess_vertex_t) ); if ( last_vertex == NULL ) { tess_error_callback( tobj, GLU_OUT_OF_MEMORY ); return; } current->vertices = last_vertex; current->last_vertex = last_vertex; last_vertex->index = -1; last_vertex->data = vertex_data; last_vertex->coords[X] = coords[X]; last_vertex->coords[Y] = coords[Y]; last_vertex->coords[Z] = coords[Z]; last_vertex->v[X] = 0.0; last_vertex->v[Y] = 0.0; last_vertex->edge_flag = GL_TRUE; last_vertex->side = 0.0; last_vertex->next = NULL; last_vertex->prev = NULL; current->num_vertices++; } 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; vertex->coords[X] = coords[X]; vertex->coords[Y] = coords[Y]; vertex->coords[Z] = coords[Z]; vertex->v[X] = 0.0; vertex->v[Y] = 0.0; vertex->edge_flag = GL_TRUE; vertex->side = 0.0; vertex->next = NULL; vertex->prev = last_vertex; current->num_vertices++; last_vertex->next = vertex; current->last_vertex = vertex; } cleanup: MSG( 15, " <- gluTessVertex( tobj:%p )\n", tobj ); return; } /***************************************************************************** * gluTessEndContour *****************************************************************************/ void GLAPIENTRY gluTessEndContour( GLUtesselator *tobj ) { MSG( 15, " -> gluTessEndContour( tobj:%p )\n", tobj ); TESS_CHECK_ERRORS( tobj ); if ( tobj->current_contour == NULL ) { /* gluTessBeginContour was not called. */ tess_error_callback( tobj, GLU_TESS_ERROR2 ); return; } if ( tobj->current_contour->num_vertices > 0 ) { inspect_current_contour( tobj ); } else { delete_contour( &tobj->current_contour ); } cleanup: MSG( 15, " <- gluTessEndContour( tobj:%p )\n", tobj ); return; } /***************************************************************************** * gluTessEndPolygon *****************************************************************************/ void GLAPIENTRY gluTessEndPolygon( GLUtesselator *tobj ) { 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->num_contours == 0 ) { tess_cleanup( tobj ); return; } /* Wrap the contour list. */ tobj->last_contour->next = tobj->contours; tobj->contours->prev = tobj->last_contour; TESS_CHECK_ERRORS( tobj ); /* Orient the contours correctly */ orient_contours( tobj ); /* * 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 ) ) ) { fist_tessellation( tobj ); } cleanup: delete_all_contours( tobj ); MSG( 15, "<- gluTessEndPolygon( tobj:%p )\n", tobj ); } /***************************************************************************** * gluTessCallback *****************************************************************************/ void GLAPIENTRY gluTessCallback( GLUtesselator *tobj, GLenum which, void (GLCALLBACK *fn)() ) { switch ( which ) { /* Register the begin callbacks. */ case GLU_TESS_BEGIN: tobj->callbacks.begin = (void (GLCALLBACKPCAST)(GLenum)) fn; break; case GLU_TESS_BEGIN_DATA: tobj->callbacks.beginData = (void (GLCALLBACKPCAST)(GLenum, void *)) fn; break; /* Register the edge flag callbacks. */ case GLU_TESS_EDGE_FLAG: tobj->callbacks.edgeFlag = (void (GLCALLBACKPCAST)(GLboolean)) fn; break; case GLU_TESS_EDGE_FLAG_DATA: tobj->callbacks.edgeFlagData = (void (GLCALLBACKPCAST)(GLboolean, void *)) fn; break; /* Register the vertex callbacks. */ case GLU_TESS_VERTEX: tobj->callbacks.vertex = (void (GLCALLBACKPCAST)(void *)) fn; break; case GLU_TESS_VERTEX_DATA: tobj->callbacks.vertexData = (void (GLCALLBACKPCAST)(void *, void *)) fn; break; /* Register the end callbacks. */ case GLU_TESS_END: tobj->callbacks.end = (void (GLCALLBACKPCAST)(void)) fn; break; case GLU_TESS_END_DATA: tobj->callbacks.endData = (void (GLCALLBACKPCAST)(void *)) fn; break; /* Register the error callbacks. */ case GLU_TESS_ERROR: tobj->callbacks.error = (void (GLCALLBACKPCAST)(GLenum)) fn; break; case GLU_TESS_ERROR_DATA: tobj->callbacks.errorData = (void (GLCALLBACKPCAST)(GLenum, void *)) fn; break; /* Register the combine callbacks. */ case GLU_TESS_COMBINE: tobj->callbacks.combine = (void (GLCALLBACKPCAST)(GLdouble[3], void *[4], GLfloat [4], void **)) fn; break; case GLU_TESS_COMBINE_DATA: tobj->callbacks.combineData = (void (GLCALLBACKPCAST)(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; } } /***************************************************************************** * gluTessProperty * * Set the current value of the given property. *****************************************************************************/ void GLAPIENTRY gluTessProperty( GLUtesselator *tobj, GLenum which, GLdouble value ) { switch ( which ) { case GLU_TESS_BOUNDARY_ONLY: tobj->boundary_only = (GLboolean) value; break; case GLU_TESS_TOLERANCE: MSG( 15, " gluTessProperty( tobj:%p ) tolerance: %0.9f\n", tobj, value ); tobj->tolerance = value; break; case GLU_TESS_WINDING_RULE: tobj->winding_rule = (GLenum) value; break; default: MSG( 1, " gluTessProperty( tobj:%p which:%d ) invalid enum\n", tobj, which ); tobj->error = GLU_INVALID_ENUM; break; } } /***************************************************************************** * gluGetTessProperty * * Return the current value of the given property. *****************************************************************************/ void GLAPIENTRY gluGetTessProperty( GLUtesselator *tobj, GLenum which, GLdouble *value ) { switch ( which ) { case GLU_TESS_BOUNDARY_ONLY: *value = tobj->boundary_only; break; case GLU_TESS_TOLERANCE: *value = tobj->tolerance; break; case GLU_TESS_WINDING_RULE: *value = tobj->winding_rule; break; default: MSG( 1, " gluGetTessProperty( tobj:%p which:%d ) invalid enum\n", tobj, which ); tobj->error = GLU_INVALID_ENUM; break; } } /***************************************************************************** * 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 ); ASSIGN_3V( tobj->plane.normal, x, y, z ); } /***************************************************************************** * * OBSOLETE TESSELLATION FUNCTIONS * *****************************************************************************/ void GLAPIENTRY gluBeginPolygon( GLUtesselator *tobj ) { gluTessBeginPolygon( tobj, NULL ); gluTessBeginContour( tobj ); } void GLAPIENTRY gluNextContour( GLUtesselator *tobj, GLenum type ) { gluTessEndContour( tobj ); gluTessBeginContour( tobj ); } void GLAPIENTRY gluEndPolygon( GLUtesselator *tobj ) { gluTessEndContour( tobj ); gluTessEndPolygon( tobj ); }