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Diffstat (limited to 'src/glu/mesa/nurbsutl.c')
| -rw-r--r-- | src/glu/mesa/nurbsutl.c | 1309 |
1 files changed, 0 insertions, 1309 deletions
diff --git a/src/glu/mesa/nurbsutl.c b/src/glu/mesa/nurbsutl.c deleted file mode 100644 index b46348a50b..0000000000 --- a/src/glu/mesa/nurbsutl.c +++ /dev/null @@ -1,1309 +0,0 @@ - -/* - * Mesa 3-D graphics library - * Version: 3.3 - * Copyright (C) 1995-2000 Brian Paul - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Library General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Library General Public License for more details. - * - * You should have received a copy of the GNU Library General Public - * License along with this library; if not, write to the Free - * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - - -/* - * NURBS implementation written by Bogdan Sikorski (bogdan@cira.it) - * See README2 for more info. - */ - - -#ifdef PC_HEADER -#include "all.h" -#else -#include <math.h> -#include <stdlib.h> -#include "gluP.h" -#include "nurbs.h" -#endif - - -GLenum test_knot(GLint nknots, GLfloat * knot, GLint order) -{ - GLsizei i; - GLint knot_mult; - GLfloat tmp_knot; - - tmp_knot = knot[0]; - knot_mult = 1; - for (i = 1; i < nknots; i++) { - if (knot[i] < tmp_knot) - return GLU_NURBS_ERROR4; - if (fabs(tmp_knot - knot[i]) > EPSILON) { - if (knot_mult > order) - return GLU_NURBS_ERROR5; - knot_mult = 1; - tmp_knot = knot[i]; - } - else - ++knot_mult; - } - return GLU_NO_ERROR; -} - -static int -/* qsort function */ -#if defined(WIN32) && !defined(OPENSTEP) - __cdecl -#endif -knot_sort(const void *a, const void *b) -{ - GLfloat x, y; - - x = *((GLfloat *) a); - y = *((GLfloat *) b); - if (fabs(x - y) < EPSILON) - return 0; - if (x > y) - return 1; - return -1; -} - -/* insert into dest knot all values within the valid range from src knot */ -/* that do not appear in dest */ -void -collect_unified_knot(knot_str_type * dest, knot_str_type * src, - GLfloat maximal_min_knot, GLfloat minimal_max_knot) -{ - GLfloat *src_knot, *dest_knot; - GLint src_t_min, src_t_max, dest_t_min, dest_t_max; - GLint src_nknots, dest_nknots; - GLint i, j, k, new_cnt; - GLboolean not_found_flag; - - src_knot = src->unified_knot; - dest_knot = dest->unified_knot; - src_t_min = src->t_min; - src_t_max = src->t_max; - dest_t_min = dest->t_min; - dest_t_max = dest->t_max; - src_nknots = src->unified_nknots; - dest_nknots = dest->unified_nknots; - - k = new_cnt = dest_nknots; - for (i = src_t_min; i <= src_t_max; i++) - if (src_knot[i] - maximal_min_knot > -EPSILON && - src_knot[i] - minimal_max_knot < EPSILON) { - not_found_flag = GL_TRUE; - for (j = dest_t_min; j <= dest_t_max; j++) - if (fabs(dest_knot[j] - src_knot[i]) < EPSILON) { - not_found_flag = GL_FALSE; - break; - } - if (not_found_flag) { - /* knot from src is not in dest - add this knot to dest */ - dest_knot[k++] = src_knot[i]; - ++new_cnt; - ++(dest->t_max); /* the valid range widens */ - ++(dest->delta_nknots); /* increment the extra knot value counter */ - } - } - dest->unified_nknots = new_cnt; - qsort((void *) dest_knot, (size_t) new_cnt, (size_t) sizeof(GLfloat), - &knot_sort); -} - -/* basing on the new common knot range for all attributes set */ -/* t_min and t_max values for each knot - they will be used later on */ -/* by explode_knot() and calc_new_ctrl_pts */ -static void -set_new_t_min_t_max(knot_str_type * geom_knot, knot_str_type * color_knot, - knot_str_type * normal_knot, knot_str_type * texture_knot, - GLfloat maximal_min_knot, GLfloat minimal_max_knot) -{ - GLuint t_min = 0, t_max = 0, cnt = 0; - - if (minimal_max_knot - maximal_min_knot < EPSILON) { - /* knot common range empty */ - geom_knot->t_min = geom_knot->t_max = 0; - color_knot->t_min = color_knot->t_max = 0; - normal_knot->t_min = normal_knot->t_max = 0; - texture_knot->t_min = texture_knot->t_max = 0; - } - else { - if (geom_knot->unified_knot != NULL) { - cnt = geom_knot->unified_nknots; - for (t_min = 0; t_min < cnt; t_min++) - if (fabs((geom_knot->unified_knot)[t_min] - maximal_min_knot) < - EPSILON) break; - for (t_max = cnt - 1; t_max; t_max--) - if (fabs((geom_knot->unified_knot)[t_max] - minimal_max_knot) < - EPSILON) break; - } - else if (geom_knot->nknots) { - cnt = geom_knot->nknots; - for (t_min = 0; t_min < cnt; t_min++) - if (fabs((geom_knot->knot)[t_min] - maximal_min_knot) < EPSILON) - break; - for (t_max = cnt - 1; t_max; t_max--) - if (fabs((geom_knot->knot)[t_max] - minimal_max_knot) < EPSILON) - break; - } - geom_knot->t_min = t_min; - geom_knot->t_max = t_max; - if (color_knot->unified_knot != NULL) { - cnt = color_knot->unified_nknots; - for (t_min = 0; t_min < cnt; t_min++) - if (fabs((color_knot->unified_knot)[t_min] - maximal_min_knot) < - EPSILON) break; - for (t_max = cnt - 1; t_max; t_max--) - if (fabs((color_knot->unified_knot)[t_max] - minimal_max_knot) < - EPSILON) break; - color_knot->t_min = t_min; - color_knot->t_max = t_max; - } - if (normal_knot->unified_knot != NULL) { - cnt = normal_knot->unified_nknots; - for (t_min = 0; t_min < cnt; t_min++) - if (fabs((normal_knot->unified_knot)[t_min] - maximal_min_knot) < - EPSILON) break; - for (t_max = cnt - 1; t_max; t_max--) - if (fabs((normal_knot->unified_knot)[t_max] - minimal_max_knot) < - EPSILON) break; - normal_knot->t_min = t_min; - normal_knot->t_max = t_max; - } - if (texture_knot->unified_knot != NULL) { - cnt = texture_knot->unified_nknots; - for (t_min = 0; t_min < cnt; t_min++) - if (fabs((texture_knot->unified_knot)[t_min] - maximal_min_knot) - < EPSILON) - break; - for (t_max = cnt - 1; t_max; t_max--) - if (fabs((texture_knot->unified_knot)[t_max] - minimal_max_knot) - < EPSILON) - break; - texture_knot->t_min = t_min; - texture_knot->t_max = t_max; - } - } -} - -/* modify all knot valid ranges in such a way that all have the same */ -/* range, common to all knots */ -/* do this by knot insertion */ -GLenum -select_knot_working_range(GLUnurbsObj * nobj, knot_str_type * geom_knot, - knot_str_type * color_knot, - knot_str_type * normal_knot, - knot_str_type * texture_knot) -{ - GLint max_nknots; - GLfloat maximal_min_knot, minimal_max_knot; - GLint i; - - /* find the maximum modified knot length */ - max_nknots = geom_knot->nknots; - if (color_knot->unified_knot) - max_nknots += color_knot->nknots; - if (normal_knot->unified_knot) - max_nknots += normal_knot->nknots; - if (texture_knot->unified_knot) - max_nknots += texture_knot->nknots; - maximal_min_knot = (geom_knot->knot)[geom_knot->t_min]; - minimal_max_knot = (geom_knot->knot)[geom_knot->t_max]; - /* any attirb data ? */ - if (max_nknots != geom_knot->nknots) { - /* allocate space for the unified knots */ - if ((geom_knot->unified_knot = - (GLfloat *) malloc(sizeof(GLfloat) * max_nknots)) == NULL) { - call_user_error(nobj, GLU_OUT_OF_MEMORY); - return GLU_ERROR; - } - /* copy the original knot to the unified one */ - geom_knot->unified_nknots = geom_knot->nknots; - for (i = 0; i < geom_knot->nknots; i++) - (geom_knot->unified_knot)[i] = (geom_knot->knot)[i]; - if (color_knot->unified_knot) { - if ((color_knot->knot)[color_knot->t_min] - maximal_min_knot > - EPSILON) - maximal_min_knot = (color_knot->knot)[color_knot->t_min]; - if (minimal_max_knot - (color_knot->knot)[color_knot->t_max] > - EPSILON) - minimal_max_knot = (color_knot->knot)[color_knot->t_max]; - if ((color_knot->unified_knot = - (GLfloat *) malloc(sizeof(GLfloat) * max_nknots)) == NULL) { - free(geom_knot->unified_knot); - call_user_error(nobj, GLU_OUT_OF_MEMORY); - return GLU_ERROR; - } - /* copy the original knot to the unified one */ - color_knot->unified_nknots = color_knot->nknots; - for (i = 0; i < color_knot->nknots; i++) - (color_knot->unified_knot)[i] = (color_knot->knot)[i]; - } - if (normal_knot->unified_knot) { - if ((normal_knot->knot)[normal_knot->t_min] - maximal_min_knot > - EPSILON) - maximal_min_knot = (normal_knot->knot)[normal_knot->t_min]; - if (minimal_max_knot - (normal_knot->knot)[normal_knot->t_max] > - EPSILON) - minimal_max_knot = (normal_knot->knot)[normal_knot->t_max]; - if ((normal_knot->unified_knot = - (GLfloat *) malloc(sizeof(GLfloat) * max_nknots)) == NULL) { - free(geom_knot->unified_knot); - free(color_knot->unified_knot); - call_user_error(nobj, GLU_OUT_OF_MEMORY); - return GLU_ERROR; - } - /* copy the original knot to the unified one */ - normal_knot->unified_nknots = normal_knot->nknots; - for (i = 0; i < normal_knot->nknots; i++) - (normal_knot->unified_knot)[i] = (normal_knot->knot)[i]; - } - if (texture_knot->unified_knot) { - if ((texture_knot->knot)[texture_knot->t_min] - maximal_min_knot > - EPSILON) - maximal_min_knot = (texture_knot->knot)[texture_knot->t_min]; - if (minimal_max_knot - (texture_knot->knot)[texture_knot->t_max] > - EPSILON) - minimal_max_knot = (texture_knot->knot)[texture_knot->t_max]; - if ((texture_knot->unified_knot = - (GLfloat *) malloc(sizeof(GLfloat) * max_nknots)) == NULL) { - free(geom_knot->unified_knot); - free(color_knot->unified_knot); - free(normal_knot->unified_knot); - call_user_error(nobj, GLU_OUT_OF_MEMORY); - return GLU_ERROR; - } - /* copy the original knot to the unified one */ - texture_knot->unified_nknots = texture_knot->nknots; - for (i = 0; i < texture_knot->nknots; i++) - (texture_knot->unified_knot)[i] = (texture_knot->knot)[i]; - } - /* work on the geometry knot with all additional knot values */ - /* appearing in attirbutive knots */ - if (minimal_max_knot - maximal_min_knot < EPSILON) { - /* empty working range */ - geom_knot->unified_nknots = 0; - color_knot->unified_nknots = 0; - normal_knot->unified_nknots = 0; - texture_knot->unified_nknots = 0; - } - else { - if (color_knot->unified_knot) - collect_unified_knot(geom_knot, color_knot, maximal_min_knot, - minimal_max_knot); - if (normal_knot->unified_knot) - collect_unified_knot(geom_knot, normal_knot, maximal_min_knot, - minimal_max_knot); - if (texture_knot->unified_knot) - collect_unified_knot(geom_knot, texture_knot, maximal_min_knot, - minimal_max_knot); - /* since we have now built the "unified" geometry knot */ - /* add same knot values to all attributive knots */ - if (color_knot->unified_knot) - collect_unified_knot(color_knot, geom_knot, maximal_min_knot, - minimal_max_knot); - if (normal_knot->unified_knot) - collect_unified_knot(normal_knot, geom_knot, maximal_min_knot, - minimal_max_knot); - if (texture_knot->unified_knot) - collect_unified_knot(texture_knot, geom_knot, maximal_min_knot, - minimal_max_knot); - } - } - set_new_t_min_t_max(geom_knot, color_knot, normal_knot, texture_knot, - maximal_min_knot, minimal_max_knot); - return GLU_NO_ERROR; -} - -void -free_unified_knots(knot_str_type * geom_knot, knot_str_type * color_knot, - knot_str_type * normal_knot, knot_str_type * texture_knot) -{ - if (geom_knot->unified_knot) - free(geom_knot->unified_knot); - if (color_knot->unified_knot) - free(color_knot->unified_knot); - if (normal_knot->unified_knot) - free(normal_knot->unified_knot); - if (texture_knot->unified_knot) - free(texture_knot->unified_knot); -} - -GLenum explode_knot(knot_str_type * the_knot) -{ - GLfloat *knot, *new_knot; - GLint nknots, n_new_knots = 0; - GLint t_min, t_max; - GLint ord; - GLsizei i, j, k; - GLfloat tmp_float; - - if (the_knot->unified_knot) { - knot = the_knot->unified_knot; - nknots = the_knot->unified_nknots; - } - else { - knot = the_knot->knot; - nknots = the_knot->nknots; - } - ord = the_knot->order; - t_min = the_knot->t_min; - t_max = the_knot->t_max; - - for (i = t_min; i <= t_max;) { - tmp_float = knot[i]; - for (j = 0; j < ord && (i + j) <= t_max; j++) - if (fabs(tmp_float - knot[i + j]) > EPSILON) - break; - n_new_knots += ord - j; - i += j; - } - /* alloc space for new_knot */ - if ( - (new_knot = - (GLfloat *) malloc(sizeof(GLfloat) * (nknots + n_new_knots + 1))) == NULL) { - return GLU_OUT_OF_MEMORY; - } - /* fill in new knot */ - for (j = 0; j < t_min; j++) - new_knot[j] = knot[j]; - for (i = j; i <= t_max; i++) { - tmp_float = knot[i]; - for (k = 0; k < ord; k++) { - new_knot[j++] = knot[i]; - if (tmp_float == knot[i + 1]) - i++; - } - } - for (i = t_max + 1; i < (int) nknots; i++) - new_knot[j++] = knot[i]; - /* fill in the knot structure */ - the_knot->new_knot = new_knot; - the_knot->delta_nknots += n_new_knots; - the_knot->t_max += n_new_knots; - return GLU_NO_ERROR; -} - -GLenum calc_alphas(knot_str_type * the_knot) -{ - GLfloat tmp_float; - int i, j, k, m, n; - int order; - GLfloat *alpha, *alpha_new, *tmp_alpha; - GLfloat denom; - GLfloat *knot, *new_knot; - - - knot = the_knot->knot; - order = the_knot->order; - new_knot = the_knot->new_knot; - n = the_knot->nknots - the_knot->order; - m = n + the_knot->delta_nknots; - if ((alpha = (GLfloat *) malloc(sizeof(GLfloat) * n * m)) == NULL) { - return GLU_OUT_OF_MEMORY; - } - if ((alpha_new = (GLfloat *) malloc(sizeof(GLfloat) * n * m)) == NULL) { - free(alpha); - return GLU_OUT_OF_MEMORY; - } - for (j = 0; j < m; j++) { - for (i = 0; i < n; i++) { - if ((knot[i] <= new_knot[j]) && (new_knot[j] < knot[i + 1])) - tmp_float = 1.0; - else - tmp_float = 0.0; - alpha[i + j * n] = tmp_float; - } - } - for (k = 1; k < order; k++) { - for (j = 0; j < m; j++) - for (i = 0; i < n; i++) { - denom = knot[i + k] - knot[i]; - if (fabs(denom) < EPSILON) - tmp_float = 0.0; - else - tmp_float = (new_knot[j + k] - knot[i]) / denom * - alpha[i + j * n]; - denom = knot[i + k + 1] - knot[i + 1]; - if (fabs(denom) > EPSILON) - tmp_float += (knot[i + k + 1] - new_knot[j + k]) / denom * - alpha[(i + 1) + j * n]; - alpha_new[i + j * n] = tmp_float; - } - tmp_alpha = alpha_new; - alpha_new = alpha; - alpha = tmp_alpha; - } - the_knot->alpha = alpha; - free(alpha_new); - return GLU_NO_ERROR; -} - -GLenum -calc_new_ctrl_pts(GLfloat * ctrl, GLint stride, knot_str_type * the_knot, - GLint dim, GLfloat ** new_ctrl, GLint * ncontrol) -{ - GLsizei i, j, k, l, m, n; - GLsizei index1, index2; - GLfloat *alpha; - GLfloat *new_knot; - - new_knot = the_knot->new_knot; - n = the_knot->nknots - the_knot->order; - alpha = the_knot->alpha; - - m = the_knot->t_max + 1 - the_knot->t_min - the_knot->order; - k = the_knot->t_min; - /* allocate space for new control points */ - if ((*new_ctrl = (GLfloat *) malloc(sizeof(GLfloat) * dim * m)) == NULL) { - return GLU_OUT_OF_MEMORY; - } - for (j = 0; j < m; j++) { - for (l = 0; l < dim; l++) - (*new_ctrl)[j * dim + l] = 0.0; - for (i = 0; i < n; i++) { - index1 = i + (j + k) * n; - index2 = i * stride; - for (l = 0; l < dim; l++) - (*new_ctrl)[j * dim + l] += alpha[index1] * ctrl[index2 + l]; - } - } - *ncontrol = (GLint) m; - return GLU_NO_ERROR; -} - -static GLint -calc_factor(GLfloat * pts, GLint order, GLint indx, GLint stride, - GLfloat tolerance, GLint dim) -{ - GLdouble model[16], proj[16]; - GLint viewport[4]; - GLdouble x, y, z, w, winx1, winy1, winz, winx2, winy2; - GLint i; - GLdouble len, dx, dy; - - glGetDoublev(GL_MODELVIEW_MATRIX, model); - glGetDoublev(GL_PROJECTION_MATRIX, proj); - glGetIntegerv(GL_VIEWPORT, viewport); - if (dim == 4) { - w = (GLdouble) pts[indx + 3]; - x = (GLdouble) pts[indx] / w; - y = (GLdouble) pts[indx + 1] / w; - z = (GLdouble) pts[indx + 2] / w; - gluProject(x, y, z, model, proj, viewport, &winx1, &winy1, &winz); - len = 0.0; - for (i = 1; i < order; i++) { - w = (GLdouble) pts[indx + i * stride + 3]; - x = (GLdouble) pts[indx + i * stride] / w; - y = (GLdouble) pts[indx + i * stride + 1] / w; - z = (GLdouble) pts[indx + i * stride + 2] / w; - if (gluProject - (x, y, z, model, proj, viewport, &winx2, &winy2, &winz)) { - dx = winx2 - winx1; - dy = winy2 - winy1; - len += sqrt(dx * dx + dy * dy); - } - winx1 = winx2; - winy1 = winy2; - } - } - else { - x = (GLdouble) pts[indx]; - y = (GLdouble) pts[indx + 1]; - if (dim == 2) - z = 0.0; - else - z = (GLdouble) pts[indx + 2]; - gluProject(x, y, z, model, proj, viewport, &winx1, &winy1, &winz); - len = 0.0; - for (i = 1; i < order; i++) { - x = (GLdouble) pts[indx + i * stride]; - y = (GLdouble) pts[indx + i * stride + 1]; - if (dim == 2) - z = 0.0; - else - z = (GLdouble) pts[indx + i * stride + 2]; - if (gluProject - (x, y, z, model, proj, viewport, &winx2, &winy2, &winz)) { - dx = winx2 - winx1; - dy = winy2 - winy1; - len += sqrt(dx * dx + dy * dy); - } - winx1 = winx2; - winy1 = winy2; - } - } - len /= tolerance; - return ((GLint) len + 1); -} - -/* we can't use the Mesa evaluators - no way to get the point coords */ -/* so we use our own Bezier point calculus routines */ -/* because I'm lazy, I reuse the ones from eval.c */ - -static void -bezier_curve(GLfloat * cp, GLfloat * out, GLfloat t, - GLuint dim, GLuint order, GLint offset) -{ - GLfloat s, powert; - GLuint i, k, bincoeff; - - if (order >= 2) { - bincoeff = order - 1; - s = 1.0 - t; - - for (k = 0; k < dim; k++) - out[k] = s * cp[k] + bincoeff * t * cp[offset + k]; - - for (i = 2, cp += 2 * offset, powert = t * t; i < order; - i++, powert *= t, cp += offset) { - bincoeff *= order - i; - bincoeff /= i; - - for (k = 0; k < dim; k++) - out[k] = s * out[k] + bincoeff * powert * cp[k]; - } - } - else { /* order=1 -> constant curve */ - - for (k = 0; k < dim; k++) - out[k] = cp[k]; - } -} - -static GLint -calc_parametric_factor(GLfloat * pts, GLint order, GLint indx, GLint stride, - GLfloat tolerance, GLint dim) -{ - GLdouble model[16], proj[16]; - GLint viewport[4]; - GLdouble x, y, z, w, x1, y1, z1, x2, y2, z2, x3, y3, z3; - GLint i; - GLint P; - GLfloat bez_pt[4]; - GLdouble len = 0.0, tmp, z_med; - - P = 2 * (order + 2); - glGetDoublev(GL_MODELVIEW_MATRIX, model); - glGetDoublev(GL_PROJECTION_MATRIX, proj); - glGetIntegerv(GL_VIEWPORT, viewport); - z_med = (viewport[2] + viewport[3]) * 0.5; - switch (dim) { - case 4: - for (i = 1; i < P; i++) { - bezier_curve(pts + indx, bez_pt, (GLfloat) i / (GLfloat) P, 4, - order, stride); - w = (GLdouble) bez_pt[3]; - x = (GLdouble) bez_pt[0] / w; - y = (GLdouble) bez_pt[1] / w; - z = (GLdouble) bez_pt[2] / w; - gluProject(x, y, z, model, proj, viewport, &x3, &y3, &z3); - z3 *= z_med; - bezier_curve(pts + indx, bez_pt, (GLfloat) (i - 1) / (GLfloat) P, 4, - order, stride); - w = (GLdouble) bez_pt[3]; - x = (GLdouble) bez_pt[0] / w; - y = (GLdouble) bez_pt[1] / w; - z = (GLdouble) bez_pt[2] / w; - gluProject(x, y, z, model, proj, viewport, &x1, &y1, &z1); - z1 *= z_med; - bezier_curve(pts + indx, bez_pt, (GLfloat) (i + 1) / (GLfloat) P, 4, - order, stride); - w = (GLdouble) bez_pt[3]; - x = (GLdouble) bez_pt[0] / w; - y = (GLdouble) bez_pt[1] / w; - z = (GLdouble) bez_pt[2] / w; - gluProject(x, y, z, model, proj, viewport, &x2, &y2, &z2); - z2 *= z_med; - /* calc distance between point (x3,y3,z3) and line segment */ - /* <x1,y1,z1><x2,y2,z2> */ - x = x2 - x1; - y = y2 - y1; - z = z2 - z1; - tmp = sqrt(x * x + y * y + z * z); - x /= tmp; - y /= tmp; - z /= tmp; - tmp = x3 * x + y3 * y + z3 * z - x1 * x - y1 * y - z1 * z; - x = x1 + x * tmp - x3; - y = y1 + y * tmp - y3; - z = z1 + z * tmp - z3; - tmp = sqrt(x * x + y * y + z * z); - if (tmp > len) - len = tmp; - } - break; - case 3: - for (i = 1; i < P; i++) { - bezier_curve(pts + indx, bez_pt, (GLfloat) i / (GLfloat) P, 3, - order, stride); - x = (GLdouble) bez_pt[0]; - y = (GLdouble) bez_pt[1]; - z = (GLdouble) bez_pt[2]; - gluProject(x, y, z, model, proj, viewport, &x3, &y3, &z3); - z3 *= z_med; - bezier_curve(pts + indx, bez_pt, (GLfloat) (i - 1) / (GLfloat) P, 3, - order, stride); - x = (GLdouble) bez_pt[0]; - y = (GLdouble) bez_pt[1]; - z = (GLdouble) bez_pt[2]; - gluProject(x, y, z, model, proj, viewport, &x1, &y1, &z1); - z1 *= z_med; - bezier_curve(pts + indx, bez_pt, (GLfloat) (i + 1) / (GLfloat) P, 3, - order, stride); - x = (GLdouble) bez_pt[0]; - y = (GLdouble) bez_pt[1]; - z = (GLdouble) bez_pt[2]; - gluProject(x, y, z, model, proj, viewport, &x2, &y2, &z2); - z2 *= z_med; - /* calc distance between point (x3,y3,z3) and line segment */ - /* <x1,y1,z1><x2,y2,z2> */ - x = x2 - x1; - y = y2 - y1; - z = z2 - z1; - tmp = sqrt(x * x + y * y + z * z); - x /= tmp; - y /= tmp; - z /= tmp; - tmp = x3 * x + y3 * y + z3 * z - x1 * x - y1 * y - z1 * z; - x = x1 + x * tmp - x3; - y = y1 + y * tmp - y3; - z = z1 + z * tmp - z3; - tmp = sqrt(x * x + y * y + z * z); - if (tmp > len) - len = tmp; - } - break; - case 2: - for (i = 1; i < P; i++) { - bezier_curve(pts + indx, bez_pt, (GLfloat) i / (GLfloat) P, 2, - order, stride); - x = (GLdouble) bez_pt[0]; - y = (GLdouble) bez_pt[1]; - z = 0.0; - gluProject(x, y, z, model, proj, viewport, &x3, &y3, &z3); - z3 *= z_med; - bezier_curve(pts + indx, bez_pt, (GLfloat) (i - 1) / (GLfloat) P, 2, - order, stride); - x = (GLdouble) bez_pt[0]; - y = (GLdouble) bez_pt[1]; - z = 0.0; - gluProject(x, y, z, model, proj, viewport, &x1, &y1, &z1); - z1 *= z_med; - bezier_curve(pts + indx, bez_pt, (GLfloat) (i + 1) / (GLfloat) P, 2, - order, stride); - x = (GLdouble) bez_pt[0]; - y = (GLdouble) bez_pt[1]; - z = 0.0; - gluProject(x, y, z, model, proj, viewport, &x2, &y2, &z2); - z2 *= z_med; - /* calc distance between point (x3,y3,z3) and line segment */ - /* <x1,y1,z1><x2,y2,z2> */ - x = x2 - x1; - y = y2 - y1; - z = z2 - z1; - tmp = sqrt(x * x + y * y + z * z); - x /= tmp; - y /= tmp; - z /= tmp; - tmp = x3 * x + y3 * y + z3 * z - x1 * x - y1 * y - z1 * z; - x = x1 + x * tmp - x3; - y = y1 + y * tmp - y3; - z = z1 + z * tmp - z3; - tmp = sqrt(x * x + y * y + z * z); - if (tmp > len) - len = tmp; - } - break; - - } - if (len < tolerance) - return (order); - else - return (GLint) (sqrt(len / tolerance) * (order + 2) + 1); -} - -static GLenum -calc_sampling_3D(new_ctrl_type * new_ctrl, GLfloat tolerance, GLint dim, - GLint uorder, GLint vorder, GLint ** ufactors, - GLint ** vfactors) -{ - GLfloat *ctrl; - GLint tmp_factor1, tmp_factor2; - GLint ufactor_cnt, vfactor_cnt; - GLint offset1, offset2, offset3; - GLint i, j; - - ufactor_cnt = new_ctrl->s_bezier_cnt; - vfactor_cnt = new_ctrl->t_bezier_cnt; - if ((*ufactors = (GLint *) malloc(sizeof(GLint) * ufactor_cnt * 3)) - == NULL) { - return GLU_OUT_OF_MEMORY; - } - if ((*vfactors = (GLint *) malloc(sizeof(GLint) * vfactor_cnt * 3)) - == NULL) { - free(*ufactors); - return GLU_OUT_OF_MEMORY; - } - ctrl = new_ctrl->geom_ctrl; - offset1 = new_ctrl->geom_t_stride * vorder; - offset2 = new_ctrl->geom_s_stride * uorder; - for (j = 0; j < vfactor_cnt; j++) { - *(*vfactors + j * 3 + 1) = tmp_factor1 = calc_factor(ctrl, vorder, - j * offset1, dim, - tolerance, dim); - /* loop ufactor_cnt-1 times */ - for (i = 1; i < ufactor_cnt; i++) { - tmp_factor2 = calc_factor(ctrl, vorder, - j * offset1 + i * offset2, dim, tolerance, - dim); - if (tmp_factor2 > tmp_factor1) - tmp_factor1 = tmp_factor2; - } - /* last time for the opposite edge */ - *(*vfactors + j * 3 + 2) = tmp_factor2 = calc_factor(ctrl, vorder, - j * offset1 + - i * offset2 - - new_ctrl-> - geom_s_stride, dim, - tolerance, dim); - if (tmp_factor2 > tmp_factor1) - *(*vfactors + j * 3) = tmp_factor2; - else - *(*vfactors + j * 3) = tmp_factor1; - } - offset3 = new_ctrl->geom_s_stride; - offset2 = new_ctrl->geom_s_stride * uorder; - for (j = 0; j < ufactor_cnt; j++) { - *(*ufactors + j * 3 + 1) = tmp_factor1 = calc_factor(ctrl, uorder, - j * offset2, - offset3, tolerance, - dim); - /* loop vfactor_cnt-1 times */ - for (i = 1; i < vfactor_cnt; i++) { - tmp_factor2 = calc_factor(ctrl, uorder, - j * offset2 + i * offset1, offset3, - tolerance, dim); - if (tmp_factor2 > tmp_factor1) - tmp_factor1 = tmp_factor2; - } - /* last time for the opposite edge */ - *(*ufactors + j * 3 + 2) = tmp_factor2 = calc_factor(ctrl, uorder, - j * offset2 + - i * offset1 - - new_ctrl-> - geom_t_stride, - offset3, tolerance, - dim); - if (tmp_factor2 > tmp_factor1) - *(*ufactors + j * 3) = tmp_factor2; - else - *(*ufactors + j * 3) = tmp_factor1; - } - return GL_NO_ERROR; -} - -static GLenum -calc_sampling_param_3D(new_ctrl_type * new_ctrl, GLfloat tolerance, GLint dim, - GLint uorder, GLint vorder, GLint ** ufactors, - GLint ** vfactors) -{ - GLfloat *ctrl; - GLint tmp_factor1, tmp_factor2; - GLint ufactor_cnt, vfactor_cnt; - GLint offset1, offset2, offset3; - GLint i, j; - - ufactor_cnt = new_ctrl->s_bezier_cnt; - vfactor_cnt = new_ctrl->t_bezier_cnt; - if ((*ufactors = (GLint *) malloc(sizeof(GLint) * ufactor_cnt * 3)) - == NULL) { - return GLU_OUT_OF_MEMORY; - } - if ((*vfactors = (GLint *) malloc(sizeof(GLint) * vfactor_cnt * 3)) - == NULL) { - free(*ufactors); - return GLU_OUT_OF_MEMORY; - } - ctrl = new_ctrl->geom_ctrl; - offset1 = new_ctrl->geom_t_stride * vorder; - offset2 = new_ctrl->geom_s_stride * uorder; - for (j = 0; j < vfactor_cnt; j++) { - *(*vfactors + j * 3 + 1) = tmp_factor1 = - calc_parametric_factor(ctrl, vorder, j * offset1, dim, tolerance, - dim); - /* loop ufactor_cnt-1 times */ - for (i = 1; i < ufactor_cnt; i++) { - tmp_factor2 = calc_parametric_factor(ctrl, vorder, - j * offset1 + i * offset2, dim, - tolerance, dim); - if (tmp_factor2 > tmp_factor1) - tmp_factor1 = tmp_factor2; - } - /* last time for the opposite edge */ - *(*vfactors + j * 3 + 2) = tmp_factor2 = - calc_parametric_factor(ctrl, vorder, - j * offset1 + i * offset2 - - new_ctrl->geom_s_stride, dim, tolerance, dim); - if (tmp_factor2 > tmp_factor1) - *(*vfactors + j * 3) = tmp_factor2; - else - *(*vfactors + j * 3) = tmp_factor1; - } - offset3 = new_ctrl->geom_s_stride; - offset2 = new_ctrl->geom_s_stride * uorder; - for (j = 0; j < ufactor_cnt; j++) { - *(*ufactors + j * 3 + 1) = tmp_factor1 = - calc_parametric_factor(ctrl, uorder, j * offset2, offset3, tolerance, - dim); - /* loop vfactor_cnt-1 times */ - for (i = 1; i < vfactor_cnt; i++) { - tmp_factor2 = calc_parametric_factor(ctrl, uorder, - j * offset2 + i * offset1, - offset3, tolerance, dim); - if (tmp_factor2 > tmp_factor1) - tmp_factor1 = tmp_factor2; - } - /* last time for the opposite edge */ - *(*ufactors + j * 3 + 2) = tmp_factor2 = - calc_parametric_factor(ctrl, uorder, - j * offset2 + i * offset1 - - new_ctrl->geom_t_stride, offset3, tolerance, - dim); - if (tmp_factor2 > tmp_factor1) - *(*ufactors + j * 3) = tmp_factor2; - else - *(*ufactors + j * 3) = tmp_factor1; - } - return GL_NO_ERROR; -} - -static GLenum -calc_sampling_2D(GLfloat * ctrl, GLint cnt, GLint order, - GLfloat tolerance, GLint dim, GLint ** factors) -{ - GLint factor_cnt; - GLint tmp_factor; - GLint offset; - GLint i; - - factor_cnt = cnt / order; - if ((*factors = (GLint *) malloc(sizeof(GLint) * factor_cnt)) == NULL) { - return GLU_OUT_OF_MEMORY; - } - offset = order * dim; - for (i = 0; i < factor_cnt; i++) { - tmp_factor = calc_factor(ctrl, order, i * offset, dim, tolerance, dim); - if (tmp_factor == 0) - (*factors)[i] = 1; - else - (*factors)[i] = tmp_factor; - } - return GL_NO_ERROR; -} - -static void -set_sampling_and_culling(GLUnurbsObj * nobj) -{ - if (nobj->auto_load_matrix == GL_FALSE) { - GLint i; - GLfloat m[4]; - - glPushAttrib((GLbitfield) (GL_VIEWPORT_BIT | GL_TRANSFORM_BIT)); - for (i = 0; i < 4; i++) - m[i] = nobj->sampling_matrices.viewport[i]; - glViewport(m[0], m[1], m[2], m[3]); - glMatrixMode(GL_PROJECTION); - glPushMatrix(); - glLoadMatrixf(nobj->sampling_matrices.proj); - glMatrixMode(GL_MODELVIEW); - glPushMatrix(); - glLoadMatrixf(nobj->sampling_matrices.model); - } -} - -static void -revert_sampling_and_culling(GLUnurbsObj * nobj) -{ - if (nobj->auto_load_matrix == GL_FALSE) { - glMatrixMode(GL_MODELVIEW); - glPopMatrix(); - glMatrixMode(GL_PROJECTION); - glPopMatrix(); - glPopAttrib(); - } -} - -GLenum -glu_do_sampling_3D(GLUnurbsObj * nobj, new_ctrl_type * new_ctrl, - GLint ** sfactors, GLint ** tfactors) -{ - GLint dim; - GLenum err; - - *sfactors = NULL; - *tfactors = NULL; - dim = nobj->surface.geom.dim; - set_sampling_and_culling(nobj); - if ((err = calc_sampling_3D(new_ctrl, nobj->sampling_tolerance, dim, - nobj->surface.geom.sorder, - nobj->surface.geom.torder, sfactors, - tfactors)) == GLU_ERROR) { - revert_sampling_and_culling(nobj); - call_user_error(nobj, err); - return GLU_ERROR; - } - revert_sampling_and_culling(nobj); - return GLU_NO_ERROR; -} - -GLenum -glu_do_sampling_uv(GLUnurbsObj * nobj, new_ctrl_type * new_ctrl, - GLint ** sfactors, GLint ** tfactors) -{ - GLint s_cnt, t_cnt, i; - GLint u_steps, v_steps; - - s_cnt = new_ctrl->s_bezier_cnt; - t_cnt = new_ctrl->t_bezier_cnt; - *sfactors = NULL; - *tfactors = NULL; - if ((*sfactors = (GLint *) malloc(sizeof(GLint) * s_cnt * 3)) - == NULL) { - return GLU_OUT_OF_MEMORY; - } - if ((*tfactors = (GLint *) malloc(sizeof(GLint) * t_cnt * 3)) - == NULL) { - free(*sfactors); - return GLU_OUT_OF_MEMORY; - } - u_steps = nobj->u_step; - v_steps = nobj->v_step; - for (i = 0; i < s_cnt; i++) { - *(*sfactors + i * 3) = u_steps; - *(*sfactors + i * 3 + 1) = u_steps; - *(*sfactors + i * 3 + 2) = u_steps; - } - for (i = 0; i < t_cnt; i++) { - *(*tfactors + i * 3) = v_steps; - *(*tfactors + i * 3 + 1) = v_steps; - *(*tfactors + i * 3 + 2) = v_steps; - } - return GLU_NO_ERROR; -} - - -GLenum -glu_do_sampling_param_3D(GLUnurbsObj * nobj, new_ctrl_type * new_ctrl, - GLint ** sfactors, GLint ** tfactors) -{ - GLint dim; - GLenum err; - - *sfactors = NULL; - *tfactors = NULL; - dim = nobj->surface.geom.dim; - set_sampling_and_culling(nobj); - if ( - (err = - calc_sampling_param_3D(new_ctrl, nobj->parametric_tolerance, dim, - nobj->surface.geom.sorder, - nobj->surface.geom.torder, sfactors, - tfactors)) == GLU_ERROR) { - revert_sampling_and_culling(nobj); - call_user_error(nobj, err); - return GLU_ERROR; - } - revert_sampling_and_culling(nobj); - return GLU_NO_ERROR; -} - - -static GLenum -glu_do_sampling_2D(GLUnurbsObj * nobj, GLfloat * ctrl, GLint cnt, GLint order, - GLint dim, GLint ** factors) -{ - GLenum err; - - set_sampling_and_culling(nobj); - err = calc_sampling_2D(ctrl, cnt, order, nobj->sampling_tolerance, dim, - factors); - revert_sampling_and_culling(nobj); - return err; -} - - -static GLenum -glu_do_sampling_u(GLUnurbsObj * nobj, GLfloat * ctrl, GLint cnt, GLint order, - GLint dim, GLint ** factors) -{ - GLint i; - GLint u_steps; - - cnt /= order; - if ((*factors = (GLint *) malloc(sizeof(GLint) * cnt)) - == NULL) { - return GLU_OUT_OF_MEMORY; - } - u_steps = nobj->u_step; - for (i = 0; i < cnt; i++) - (*factors)[i] = u_steps; - return GLU_NO_ERROR; -} - - -static GLenum -glu_do_sampling_param_2D(GLUnurbsObj * nobj, GLfloat * ctrl, GLint cnt, - GLint order, GLint dim, GLint ** factors) -{ - GLint i; - GLint u_steps; - GLfloat tolerance; - - set_sampling_and_culling(nobj); - tolerance = nobj->parametric_tolerance; - cnt /= order; - if ((*factors = (GLint *) malloc(sizeof(GLint) * cnt)) - == NULL) { - revert_sampling_and_culling(nobj); - return GLU_OUT_OF_MEMORY; - } - u_steps = nobj->u_step; - for (i = 0; i < cnt; i++) { - (*factors)[i] = calc_parametric_factor(ctrl, order, 0, - dim, tolerance, dim); - - } - revert_sampling_and_culling(nobj); - return GLU_NO_ERROR; -} - -GLenum -glu_do_sampling_crv(GLUnurbsObj * nobj, GLfloat * ctrl, GLint cnt, - GLint order, GLint dim, GLint ** factors) -{ - GLenum err; - - *factors = NULL; - switch (nobj->sampling_method) { - case GLU_PATH_LENGTH: - if ((err = glu_do_sampling_2D(nobj, ctrl, cnt, order, dim, factors)) != - GLU_NO_ERROR) { - call_user_error(nobj, err); - return GLU_ERROR; - } - break; - case GLU_DOMAIN_DISTANCE: - if ((err = glu_do_sampling_u(nobj, ctrl, cnt, order, dim, factors)) != - GLU_NO_ERROR) { - call_user_error(nobj, err); - return GLU_ERROR; - } - break; - case GLU_PARAMETRIC_ERROR: - if ( - (err = - glu_do_sampling_param_2D(nobj, ctrl, cnt, order, dim, - factors)) != GLU_NO_ERROR) { - call_user_error(nobj, err); - return GLU_ERROR; - } - break; - default: - abort(); - } - - return GLU_NO_ERROR; -} - -/* TODO - i don't like this culling - this one just tests if at least one */ -/* ctrl point lies within the viewport . Also the point_in_viewport() */ -/* should be included in the fnctions for efficiency reasons */ - -static GLboolean -point_in_viewport(GLfloat * pt, GLint dim) -{ - GLdouble model[16], proj[16]; - GLint viewport[4]; - GLdouble x, y, z, w, winx, winy, winz; - - glGetDoublev(GL_MODELVIEW_MATRIX, model); - glGetDoublev(GL_PROJECTION_MATRIX, proj); - glGetIntegerv(GL_VIEWPORT, viewport); - if (dim == 3) { - x = (GLdouble) pt[0]; - y = (GLdouble) pt[1]; - z = (GLdouble) pt[2]; - gluProject(x, y, z, model, proj, viewport, &winx, &winy, &winz); - } - else { - w = (GLdouble) pt[3]; - x = (GLdouble) pt[0] / w; - y = (GLdouble) pt[1] / w; - z = (GLdouble) pt[2] / w; - gluProject(x, y, z, model, proj, viewport, &winx, &winy, &winz); - } - if ((GLint) winx >= viewport[0] && (GLint) winx < viewport[2] && - (GLint) winy >= viewport[1] && (GLint) winy < viewport[3]) - return GL_TRUE; - return GL_FALSE; -} - -GLboolean -fine_culling_test_3D(GLUnurbsObj * nobj, GLfloat * pts, GLint s_cnt, - GLint t_cnt, GLint s_stride, GLint t_stride, GLint dim) -{ - GLint i, j; - - if (nobj->culling == GL_FALSE) - return GL_FALSE; - set_sampling_and_culling(nobj); - - if (dim == 3) { - for (i = 0; i < s_cnt; i++) - for (j = 0; j < t_cnt; j++) - if (point_in_viewport(pts + i * s_stride + j * t_stride, dim)) { - revert_sampling_and_culling(nobj); - return GL_FALSE; - } - } - else { - for (i = 0; i < s_cnt; i++) - for (j = 0; j < t_cnt; j++) - if (point_in_viewport(pts + i * s_stride + j * t_stride, dim)) { - revert_sampling_and_culling(nobj); - return GL_FALSE; - } - } - revert_sampling_and_culling(nobj); - return GL_TRUE; -} - -/*GLboolean -fine_culling_test_3D(GLUnurbsObj *nobj,GLfloat *pts,GLint s_cnt,GLint t_cnt, - GLint s_stride,GLint t_stride, GLint dim) -{ - GLint visible_cnt; - GLfloat feedback_buffer[5]; - GLsizei buffer_size; - GLint i,j; - - if(nobj->culling==GL_FALSE) - return GL_FALSE; - buffer_size=5; - set_sampling_and_culling(nobj); - - glFeedbackBuffer(buffer_size,GL_2D,feedback_buffer); - glRenderMode(GL_FEEDBACK); - if(dim==3) - { - for(i=0;i<s_cnt;i++) - { - glBegin(GL_LINE_LOOP); - for(j=0;j<t_cnt;j++) - glVertex3fv(pts+i*s_stride+j*t_stride); - glEnd(); - } - for(j=0;j<t_cnt;j++) - { - glBegin(GL_LINE_LOOP); - for(i=0;i<s_cnt;i++) - glVertex3fv(pts+i*s_stride+j*t_stride); - glEnd(); - } - } - else - { - for(i=0;i<s_cnt;i++) - { - glBegin(GL_LINE_LOOP); - for(j=0;j<t_cnt;j++) - glVertex4fv(pts+i*s_stride+j*t_stride); - glEnd(); - } - for(j=0;j<t_cnt;j++) - { - glBegin(GL_LINE_LOOP); - for(i=0;i<s_cnt;i++) - glVertex4fv(pts+i*s_stride+j*t_stride); - glEnd(); - } - } - visible_cnt=glRenderMode(GL_RENDER); - - revert_sampling_and_culling(nobj); - return (GLboolean)(visible_cnt==0); -}*/ - -GLboolean -fine_culling_test_2D(GLUnurbsObj * nobj, GLfloat * pts, GLint cnt, - GLint stride, GLint dim) -{ - GLint i; - - if (nobj->culling == GL_FALSE) - return GL_FALSE; - set_sampling_and_culling(nobj); - - if (dim == 3) { - for (i = 0; i < cnt; i++) - if (point_in_viewport(pts + i * stride, dim)) { - revert_sampling_and_culling(nobj); - return GL_FALSE; - } - } - else { - for (i = 0; i < cnt; i++) - if (point_in_viewport(pts + i * stride, dim)) { - revert_sampling_and_culling(nobj); - return GL_FALSE; - } - } - revert_sampling_and_culling(nobj); - return GL_TRUE; -} - -/*GLboolean -fine_culling_test_2D(GLUnurbsObj *nobj,GLfloat *pts,GLint cnt, - GLint stride, GLint dim) -{ - GLint visible_cnt; - GLfloat feedback_buffer[5]; - GLsizei buffer_size; - GLint i; - - if(nobj->culling==GL_FALSE) - return GL_FALSE; - buffer_size=5; - set_sampling_and_culling(nobj); - - glFeedbackBuffer(buffer_size,GL_2D,feedback_buffer); - glRenderMode(GL_FEEDBACK); - glBegin(GL_LINE_LOOP); - if(dim==3) - { - for(i=0;i<cnt;i++) - glVertex3fv(pts+i*stride); - } - else - { - for(i=0;i<cnt;i++) - glVertex4fv(pts+i*stride); - } - glEnd(); - visible_cnt=glRenderMode(GL_RENDER); - - revert_sampling_and_culling(nobj); - return (GLboolean)(visible_cnt==0); -}*/ |