Pileus Git - grits/blob - src/objects/grits-poly.c

   1 /*
   2  * Copyright (C) 2010-2011 Andy Spencer <andy753421@gmail.com>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /**
  19  * SECTION:grits-poly
  20  * @short_description: Single point polys
  21  *
  22  * Each #GritsPoly represents a 3 dimentional polygon.
  23  */
  24
  25 #include <config.h>
  26 #include "gtkgl.h"
  27 #include "grits-poly.h"
  28
  29 /* Drawing */
  30 static void grits_poly_tess(gdouble (**points)[3])
  31 {
  32         //g_debug("GritsPoly: tess");
  33         GLUtesselator *tess = gluNewTess();
  34         gluTessCallback(tess, GLU_TESS_BEGIN,  (void*)glBegin);
  35         gluTessCallback(tess, GLU_TESS_VERTEX, (void*)glVertex3dv);
  36         gluTessCallback(tess, GLU_TESS_END,    (void*)glEnd);
  37         for (int pi = 0; points[pi]; pi++) {
  38                 gluTessBeginPolygon(tess, NULL);
  39                 gluTessBeginContour(tess);
  40                 for (int ci = 0; points[pi][ci][0]; ci++) {
  41                         gluTessVertex(tess,
  42                                 points[pi][ci],
  43                                 points[pi][ci]);
  44                 }
  45                 gluTessEndContour(tess);
  46                 gluTessEndPolygon(tess);
  47         }
  48         gluDeleteTess(tess);
  49 }
  50
  51 static void grits_poly_outline(gdouble (**points)[3])
  52 {
  53         //g_debug("GritsPoly: outline");
  54         for (int pi = 0; points[pi]; pi++) {
  55                 glBegin(GL_POLYGON);
  56                 for (int ci = 0; points[pi][ci][0] &&
  57                                  points[pi][ci][1] &&
  58                                  points[pi][ci][2]; ci++)
  59                         glVertex3dv(points[pi][ci]);
  60                 glEnd();
  61         }
  62 }
  63
  64 static gboolean grits_poly_runlist(GritsPoly *poly, int i,
  65                 void (*render)(gdouble(**)[3]))
  66 {
  67         if (poly->list[i]) {
  68                 glCallList(poly->list[i]);
  69         } else {
  70                 guint list = glGenLists(1);
  71                 glNewList(list, GL_COMPILE_AND_EXECUTE);
  72                 render(poly->points);
  73                 glEndList();
  74                 poly->list[i] = list;
  75                 //g_debug("GritsPoly: genlist");
  76         }
  77         return FALSE;
  78 }
  79
  80 static void grits_poly_draw(GritsObject *_poly, GritsOpenGL *opengl)
  81 {
  82         //g_debug("GritsPoly: draw");
  83         GritsPoly *poly = GRITS_POLY(_poly);
  84
  85         glPushAttrib(GL_COLOR_BUFFER_BIT | GL_ENABLE_BIT | GL_CURRENT_BIT |
  86                         GL_POINT_BIT | GL_LINE_BIT | GL_POLYGON_BIT);
  87         glDisable(GL_TEXTURE_2D);
  88         glDisable(GL_ALPHA_TEST);
  89         glDisable(GL_CULL_FACE);
  90         glDisable(GL_LIGHTING);
  91
  92         glEnable(GL_POLYGON_OFFSET_FILL);
  93         glEnable(GL_POLYGON_OFFSET_LINE);
  94         glEnable(GL_POLYGON_OFFSET_POINT);
  95
  96         if (poly->color[3]) {
  97                 /* Draw background farthest back */
  98                 glPolygonOffset(3, 3);
  99                 glColor4dv(poly->color);
 100                 glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 101                 grits_poly_runlist(poly, 0, grits_poly_tess);
 102         }
 103
 104         glEnable(GL_POLYGON_SMOOTH);
 105         glEnable(GL_LINE_SMOOTH);
 106         glEnable(GL_POINT_SMOOTH);
 107
 108         if (!poly->color[3] && poly->border[3] && poly->width > 1) {
 109                 /* Draw line border in the middle */
 110                 glColor4d(0,0,0,1);
 111
 112                 glPointSize(poly->width*2);
 113                 glLineWidth(poly->width*2);
 114
 115                 glPolygonOffset(2, 2);
 116
 117                 glPolygonMode(GL_FRONT_AND_BACK, GL_POINT);
 118                 grits_poly_runlist(poly, 1, grits_poly_outline);
 119                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 120                 grits_poly_runlist(poly, 1, grits_poly_outline);
 121         }
 122
 123         if (poly->border[3]) {
 124                 /* Draw border front-most */
 125                 glColor4dv(poly->border);
 126
 127                 glPointSize(poly->width);
 128                 glLineWidth(poly->width);
 129
 130                 glPolygonOffset(1, 1);
 131                 if (poly->width > 1) {
 132                         glPolygonMode(GL_FRONT_AND_BACK, GL_POINT);
 133                         grits_poly_runlist(poly, 1, grits_poly_outline);
 134                 }
 135                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 136                 grits_poly_runlist(poly, 1, grits_poly_outline);
 137         }
 138
 139         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 140         glPopAttrib();
 141 }
 142
 143 static void grits_poly_pick(GritsObject *_poly, GritsOpenGL *opengl)
 144 {
 145         //g_debug("GritsPoly: pick");
 146         GritsPoly *poly = GRITS_POLY(_poly);
 147         glPushAttrib(GL_ENABLE_BIT);
 148         glDisable(GL_CULL_FACE);
 149         grits_poly_runlist(poly, 0, grits_poly_tess);
 150         glPopAttrib();
 151 }
 152
 153 static gboolean grits_poly_delete(gpointer list)
 154 {
 155         glDeleteLists((guintptr)list, 1);
 156         return FALSE;
 157 }
 158
 159 /**
 160  * grits_poly_new:
 161  * @points:  TODO
 162  * @npoints: TODO
 163  *
 164  * Create a new GritsPoly which TODO.
 165  *
 166  * Returns: the new #GritsPoly.
 167  */
 168 GritsPoly *grits_poly_new(gdouble (**points)[3])
 169 {
 170         //g_debug("GritsPoly: new - %p", points);
 171         GritsPoly *poly = g_object_new(GRITS_TYPE_POLY, NULL);
 172         poly->points    = points;
 173         return poly;
 174 }
 175
 176 GritsPoly *grits_poly_parse(const gchar *str,
 177                 const gchar *poly_sep, const gchar *point_sep, const gchar *coord_sep)
 178 {
 179         GritsPoint center;
 180         gdouble (**polys)[3] = parse_points(str,
 181                         poly_sep, point_sep, coord_sep, NULL, &center);
 182
 183         GritsPoly *poly = grits_poly_new(polys);
 184         GRITS_OBJECT(poly)->center = center;
 185         GRITS_OBJECT(poly)->skip   = GRITS_SKIP_CENTER;
 186         g_object_weak_ref(G_OBJECT(poly), (GWeakNotify)free_points, polys);
 187         return poly;
 188 }
 189
 190 /* GObject code */
 191 G_DEFINE_TYPE(GritsPoly, grits_poly, GRITS_TYPE_OBJECT);
 192 static void grits_poly_init(GritsPoly *poly)
 193 {
 194         poly->border[0] = 1;
 195         poly->border[1] = 1;
 196         poly->border[2] = 1;
 197         poly->border[3] = 0.2;
 198         poly->width     = 1;
 199         GRITS_OBJECT(poly)->skip = GRITS_SKIP_STATE;
 200 }
 201
 202 static void grits_poly_finalize(GObject *_poly)
 203 {
 204         //g_debug("GritsPoly: finalize");
 205         GritsPoly *poly = GRITS_POLY(_poly);
 206         if (poly->list[0]) g_idle_add(grits_poly_delete, (gpointer)(guintptr)poly->list[0]);
 207         if (poly->list[1]) g_idle_add(grits_poly_delete, (gpointer)(guintptr)poly->list[1]);
 208 }
 209
 210 static void grits_poly_class_init(GritsPolyClass *klass)
 211 {
 212         g_debug("GritsPoly: class_init");
 213         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 214         gobject_class->finalize = grits_poly_finalize;
 215
 216         GritsObjectClass *object_class = GRITS_OBJECT_CLASS(klass);
 217         object_class->draw = grits_poly_draw;
 218         object_class->pick = grits_poly_pick;
 219 }