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

   1 /*
   2  * Copyright (C) 2009-2010 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-volume
  20  * @short_description: 3-D gridded vovlume
  21  *
  22  * Each #GritsVolume consistes of a 3-dimentional grid of data points each
  23  * consisting of a value.
  24  *
  25  * Currently iso-surfaces are extracted and displayed when rendering the volume
  26  * data.
  27  */
  28
  29 #include <config.h>
  30 #include <math.h>
  31 #include <glib.h>
  32 #include <GL/gl.h>
  33 #include "grits-volume.h"
  34
  35 /* Drawing */
  36 static void draw_points(VolGrid *grid, gdouble level)
  37 {
  38         glPointSize(200./grid->xs);
  39         glBegin(GL_POINTS);
  40         for (int x = 0; x < grid->xs; x++)
  41         for (int y = 0; y < grid->ys; y++)
  42         for (int z = 0; z < grid->zs; z++) {
  43                 VolPoint *pt = vol_grid_get(grid, x, y, z);
  44                 if (pt->value < level)
  45                         continue;
  46
  47                 g_debug("(%d,%d,%d) value=%f", x, y, z, pt->value);
  48
  49                 glColor4f(1.0, 1.0, 1.0, pt->value/100);
  50                 glVertex3dv((double*)&pt->c);
  51         }
  52         glEnd();
  53 }
  54
  55 static void draw_iso(GList *tris)
  56 {
  57         g_debug("GritsVolume: draw_iso");
  58         glDisable(GL_CULL_FACE);
  59         glBegin(GL_TRIANGLES);
  60         for (GList *cur = tris; cur; cur = cur->next) {
  61                 VolTriangle *tri = cur->data;
  62                 VolCoord c[3] = {tri->v[0]->c,    tri->v[1]->c,    tri->v[2]->c   };
  63                 VolCoord n[3] = {tri->v[0]->norm, tri->v[1]->norm, tri->v[2]->norm};
  64
  65                 /* Normalize normal vector */
  66                 for (int i = 0; i < 3; i++) {
  67                         double total = sqrt(
  68                                 n[i].x * n[i].x +
  69                                 n[i].y * n[i].y +
  70                                 n[i].z * n[i].z);
  71                         if (total == 0)
  72                                 continue; // wtf
  73                         n[i].x = n[i].x / total;
  74                         n[i].y = n[i].y / total;
  75                         n[i].z = n[i].z / total;
  76                 }
  77
  78                 //for (int i = 0; i < 3; i++)
  79                 //      g_debug("norm=%f,%f,%f",
  80                 //              n[i].x, n[i].y, n[i].z);
  81                 //glNormal3dv((double*)&tri->norm);
  82                 glNormal3dv((double*)&n[0]); glVertex3dv((double*)&c[0]);
  83                 glNormal3dv((double*)&n[1]); glVertex3dv((double*)&c[1]);
  84                 glNormal3dv((double*)&n[2]); glVertex3dv((double*)&c[2]);
  85         }
  86         glEnd();
  87 }
  88
  89 static void draw(GritsObject *_volume, GritsOpenGL *opengl)
  90 {
  91         g_debug("GritsVolume: draw");
  92         GritsVolume *volume = GRITS_VOLUME(_volume);
  93
  94         gfloat amb[4] = {};
  95         gfloat dif[4] = {};
  96         switch (volume->disp) {
  97         case GRITS_VOLUME_SURFACE:
  98                 glDisable(GL_COLOR_MATERIAL);
  99                 amb[0] = (double)volume->color[0] / 0xff;
 100                 amb[1] = (double)volume->color[1] / 0xff;
 101                 amb[2] = (double)volume->color[2] / 0xff;
 102                 amb[3] = 1;
 103                 dif[0] = (double)volume->color[0] / 0xff;
 104                 dif[1] = (double)volume->color[1] / 0xff;
 105                 dif[2] = (double)volume->color[2] / 0xff;
 106                 dif[3] = 1;
 107                 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, amb);
 108                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, dif);
 109                 draw_iso(volume->tris);
 110                 break;
 111         case GRITS_VOLUME_POINTS:
 112                 draw_points(volume->grid, volume->level);
 113                 break;
 114         }
 115 }
 116
 117 /* Idle update */
 118 gboolean update_iso(gpointer _volume)
 119 {
 120         GritsVolume *volume = _volume;
 121         if (volume->tris) {
 122                 g_list_foreach(volume->tris, (GFunc)vol_triangle_free, NULL);
 123                 g_list_free(volume->tris);
 124         }
 125         volume->tris = marching_cubes(volume->grid, volume->level);
 126         volume->update_id = 0;
 127         grits_object_queue_draw(GRITS_OBJECT(volume));
 128         return FALSE;
 129 }
 130
 131 /***********
 132  * Methods *
 133  ***********/
 134 void grits_volume_set_level(GritsVolume *volume, gdouble level)
 135 {
 136         volume->level = level;
 137         if (!volume->update_id)
 138                 volume->update_id = g_idle_add(update_iso, volume);
 139 }
 140
 141 GritsVolume *grits_volume_new(VolGrid *grid)
 142 {
 143         g_debug("GritsVolume: new - %p[%d][%d][%d]",
 144                         grid, grid->xs, grid->ys, grid->zs);
 145         GritsVolume *volume = g_object_new(GRITS_TYPE_VOLUME, NULL);
 146         volume->grid = grid;
 147         return volume;
 148 }
 149
 150 /* GObject code */
 151 G_DEFINE_TYPE(GritsVolume, grits_volume, GRITS_TYPE_OBJECT);
 152 static void grits_volume_init(GritsVolume *volume)
 153 {
 154 }
 155
 156 static void grits_volume_finalize(GObject *_volume)
 157 {
 158         GritsVolume *volume = GRITS_VOLUME(_volume);
 159         volume->color[0] = 1;
 160         volume->color[1] = 1;
 161         volume->color[2] = 1;
 162         volume->color[3] = 1;
 163         //g_debug("GritsVolume: finalize - %s", volume->label);
 164 }
 165
 166 static void grits_volume_class_init(GritsVolumeClass *klass)
 167 {
 168         g_debug("GritsVolume: class_init");
 169         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 170         gobject_class->finalize = grits_volume_finalize;
 171
 172         GritsObjectClass *object_class = GRITS_OBJECT_CLASS(klass);
 173         object_class->draw = draw;
 174 }