Pileus Git - grits/blob - src/gis-prims.c

   1 /*
   2  * Copyright (C) 2009 Andy Spencer <spenceal@rose-hulman.edu>
   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 #include <glib.h>
  19 #include <GL/glu.h>
  20
  21 #include "gis-prims.h"
  22 #include "gis-util.h"
  23
  24 /* TODO
  25  *   - Manage normals for GisPoint
  26  */
  27
  28 /* GisPoint */
  29 GisPoint *gis_point_new()
  30 {
  31         return g_new0(GisPoint, 1);
  32 }
  33
  34 void gis_point_set_lle(GisPoint *self, gdouble lat, gdouble lon, gdouble elev)
  35 {
  36         self->lat  = lat;
  37         self->lon  = lon;
  38         self->elev = elev;
  39         lle2xyz(self->lat, self->lon, self->elev,
  40                         &self->x, &self->y, &self->z);
  41 }
  42
  43 void gis_point_set_xyz(GisPoint *self, gdouble x, gdouble y, gdouble z)
  44 {
  45         self->x = x;
  46         self->y = y;
  47         self->z = z;
  48 }
  49
  50 void gis_point_set_coords(GisPoint *self, gdouble x, gdouble y)
  51 {
  52         self->cx = x;
  53         self->cy = y;
  54 }
  55
  56 void gis_point_project(GisPoint *self, GisProjection *proj)
  57 {
  58         gluProject(self->x, self->y, self->z,
  59                    proj->model, proj->proj, proj->view,
  60                    &self->px, &self->py, &self->pz);
  61 }
  62
  63 GisPoint *gis_point_ref(GisPoint *self)
  64 {
  65         self->refs++;
  66         return self;
  67 }
  68
  69 void gis_point_unref(GisPoint *self)
  70 {
  71         self->refs--;
  72         if (self->refs <= 0)
  73                 g_free(self);
  74 }
  75
  76
  77 /* GisTriangle */
  78 GisTriangle *gis_triangle_new(GisPoint *a, GisPoint *b, GisPoint *c, guint tex)
  79 {
  80         GisTriangle *self = g_new0(GisTriangle, 1);
  81         gis_point_set_xyz(&GIS_PRIMITIVE(self)->center,
  82                 (a->x + b->x + c->x)/3,
  83                 (a->y + b->y + c->y)/3,
  84                 (a->z + b->z + c->z)/3);
  85         self->verts[0] = gis_point_ref(a);
  86         self->verts[1] = gis_point_ref(b);
  87         self->verts[2] = gis_point_ref(c);
  88         self->tex      = tex;
  89         return self;
  90 }
  91
  92 void gis_triangle_free(GisTriangle *self)
  93 {
  94         gis_point_unref(self->verts[0]);
  95         gis_point_unref(self->verts[1]);
  96         gis_point_unref(self->verts[2]);
  97         g_free(self);
  98 }
  99
 100
 101 /* GisQuad */
 102 GisQuad *gis_quad_new(GisPoint *a, GisPoint *b, GisPoint *c, GisPoint *d, guint tex)
 103 {
 104         GisQuad *self = g_new0(GisQuad, 1);
 105         gis_point_set_xyz(&GIS_PRIMITIVE(self)->center,
 106                 (a->x + b->x + c->x + d->x)/4,
 107                 (a->y + b->y + c->y + d->y)/4,
 108                 (a->z + b->z + c->z + d->z)/4);
 109         self->verts[0] = gis_point_ref(a);
 110         self->verts[1] = gis_point_ref(b);
 111         self->verts[2] = gis_point_ref(c);
 112         self->verts[3] = gis_point_ref(d);
 113         self->tex      = tex;
 114         return self;
 115 }
 116
 117 void gis_quad_free(GisQuad *self)
 118 {
 119         gis_point_unref(self->verts[0]);
 120         gis_point_unref(self->verts[1]);
 121         gis_point_unref(self->verts[2]);
 122         gis_point_unref(self->verts[3]);
 123         g_free(self);
 124 }
 125
 126
 127 /* GisCallback */
 128 GisCallback *gis_callback_new(GisCallbackFunc callback, gpointer user_data)
 129 {
 130         GisCallback *self = g_new0(GisCallback, 1);
 131         self->callback  = callback;
 132         self->user_data = user_data;
 133         return self;
 134 }
 135
 136 void gis_callback_free(GisCallback *self)
 137 {
 138         g_free(self);
 139 }