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 <gdk/gdkgl.h>
  34 #include "grits-volume.h"
  35
  36 /* Drawing */
  37 static void draw_points(VolGrid *grid, gdouble level)
  38 {
  39         glPointSize(200./grid->xs);
  40         glBegin(GL_POINTS);
  41         for (int x = 0; x < grid->xs; x++)
  42         for (int y = 0; y < grid->ys; y++)
  43         for (int z = 0; z < grid->zs; z++) {
  44                 VolPoint *pt = vol_grid_get(grid, x, y, z);
  45                 if (pt->value < level)
  46                         continue;
  47
  48                 g_debug("(%d,%d,%d) value=%f", x, y, z, pt->value);
  49
  50                 glColor4f(1.0, 1.0, 1.0, pt->value/100);
  51                 glVertex3dv((double*)&pt->c);
  52         }
  53         glEnd();
  54 }
  55
  56 static void draw_iso(GList *tris)
  57 {
  58         g_debug("GritsVolume: draw_iso");
  59         glDisable(GL_CULL_FACE);
  60         glBegin(GL_TRIANGLES);
  61         for (GList *cur = tris; cur; cur = cur->next) {
  62                 VolTriangle *tri = cur->data;
  63                 VolCoord c[3] = {tri->v[0]->c,    tri->v[1]->c,    tri->v[2]->c   };
  64                 VolCoord n[3] = {tri->v[0]->norm, tri->v[1]->norm, tri->v[2]->norm};
  65
  66                 /* Normalize normal vector */
  67                 for (int i = 0; i < 3; i++) {
  68                         double total = sqrt(
  69                                 n[i].x * n[i].x +
  70                                 n[i].y * n[i].y +
  71                                 n[i].z * n[i].z);
  72                         if (total == 0)
  73                                 continue; // wtf
  74                         n[i].x = n[i].x / total;
  75                         n[i].y = n[i].y / total;
  76                         n[i].z = n[i].z / total;
  77                 }
  78
  79                 //for (int i = 0; i < 3; i++)
  80                 //      g_debug("norm=%f,%f,%f",
  81                 //              n[i].x, n[i].y, n[i].z);
  82                 //glNormal3dv((double*)&tri->norm);
  83                 glNormal3dv((double*)&n[0]); glVertex3dv((double*)&c[0]);
  84                 glNormal3dv((double*)&n[1]); glVertex3dv((double*)&c[1]);
  85                 glNormal3dv((double*)&n[2]); glVertex3dv((double*)&c[2]);
  86         }
  87         glEnd();
  88 }
  89
  90 static void draw(GritsObject *_volume, GritsOpenGL *opengl)
  91 {
  92         g_debug("GritsVolume: draw");
  93         GritsVolume *volume = GRITS_VOLUME(_volume);
  94
  95         gfloat amb[4] = {};
  96         gfloat dif[4] = {};
  97         switch (volume->disp) {
  98         case GRITS_VOLUME_SURFACE:
  99                 glDisable(GL_COLOR_MATERIAL);
 100                 amb[0] = (double)volume->color[0] / 0xff;
 101                 amb[1] = (double)volume->color[1] / 0xff;
 102                 amb[2] = (double)volume->color[2] / 0xff;
 103                 amb[3] = 1;
 104                 dif[0] = (double)volume->color[0] / 0xff;
 105                 dif[1] = (double)volume->color[1] / 0xff;
 106                 dif[2] = (double)volume->color[2] / 0xff;
 107                 dif[3] = 1;
 108                 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, amb);
 109                 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, dif);
 110                 draw_iso(volume->tris);
 111                 break;
 112         case GRITS_VOLUME_POINTS:
 113                 draw_points(volume->grid, volume->level);
 114                 break;
 115         }
 116 }
 117
 118 /* Idle update */
 119 gboolean update_iso(gpointer _volume)
 120 {
 121         GritsVolume *volume = _volume;
 122         if (volume->tris) {
 123                 g_list_foreach(volume->tris, (GFunc)vol_triangle_free, NULL);
 124                 g_list_free(volume->tris);
 125         }
 126         volume->tris = marching_cubes(volume->grid, volume->level);
 127         volume->update_id = 0;
 128         grits_object_queue_draw(GRITS_OBJECT(volume));
 129         return FALSE;
 130 }
 131
 132 /***********
 133  * Methods *
 134  ***********/
 135 void grits_volume_set_level(GritsVolume *volume, gdouble level)
 136 {
 137         volume->level = level;
 138         if (!volume->update_id)
 139                 volume->update_id = g_idle_add(update_iso, volume);
 140 }
 141
 142 GritsVolume *grits_volume_new(VolGrid *grid)
 143 {
 144         g_debug("GritsVolume: new - %p[%d][%d][%d]",
 145                         grid, grid->xs, grid->ys, grid->zs);
 146         GritsVolume *volume = g_object_new(GRITS_TYPE_VOLUME, NULL);
 147         volume->grid = grid;
 148         return volume;
 149 }
 150
 151 /* GObject code */
 152 G_DEFINE_TYPE(GritsVolume, grits_volume, GRITS_TYPE_OBJECT);
 153 static void grits_volume_init(GritsVolume *volume)
 154 {
 155 }
 156
 157 static void grits_volume_finalize(GObject *_volume)
 158 {
 159         GritsVolume *volume = GRITS_VOLUME(_volume);
 160         volume->color[0] = 1;
 161         volume->color[1] = 1;
 162         volume->color[2] = 1;
 163         volume->color[3] = 1;
 164         //g_debug("GritsVolume: finalize - %s", volume->label);
 165 }
 166
 167 static void grits_volume_class_init(GritsVolumeClass *klass)
 168 {
 169         g_debug("GritsVolume: class_init");
 170         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 171         gobject_class->finalize = grits_volume_finalize;
 172
 173         GritsObjectClass *object_class = GRITS_OBJECT_CLASS(klass);
 174         object_class->draw = draw;
 175 }