+/*
+ * Copyright (C) 2009 Andy Spencer <spenceal@rose-hulman.edu>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+#include <GL/glu.h>
+
+#include "gis-world.h"
+#include "gis-prims.h"
+
+/* TODO
+ * - Manage normals for GisPoint
+ */
+
+/* GisPoint */
+GisPoint *gis_point_new()
+{
+ return g_new0(GisPoint, 1);
+}
+
+void gis_point_set_lle(GisPoint *self, gdouble lat, gdouble lon, gdouble elev)
+{
+ self->lat = lat;
+ self->lon = lon;
+ self->elev = elev;
+ lle2xyz(self->lat, self->lon, self->elev,
+ &self->x, &self->y, &self->z);
+}
+
+void gis_point_set_xyz(GisPoint *self, gdouble x, gdouble y, gdouble z)
+{
+ self->x = x;
+ self->y = y;
+ self->z = z;
+}
+
+void gis_point_set_coords(GisPoint *self, gdouble x, gdouble y)
+{
+ self->cx = x;
+ self->cy = y;
+}
+
+void gis_point_project(GisPoint *self, GisProjection *proj)
+{
+ gluProject(self->x, self->y, self->z,
+ proj->model, proj->proj, proj->view,
+ &self->px, &self->py, &self->pz);
+}
+
+GisPoint *gis_point_ref(GisPoint *self)
+{
+ self->refs++;
+ return self;
+}
+
+void gis_point_unref(GisPoint *self)
+{
+ self->refs--;
+ if (self->refs <= 0)
+ g_free(self);
+}
+
+
+/* GisTriangle */
+GisTriangle *gis_triangle_new(GisPoint *a, GisPoint *b, GisPoint *c, guint tex)
+{
+ GisTriangle *self = g_new0(GisTriangle, 1);
+ gis_point_set_xyz(&GIS_PRIMITIVE(self)->center,
+ (a->x + b->x + c->x)/3,
+ (a->y + b->y + c->y)/3,
+ (a->z + b->z + c->z)/3);
+ self->verts[0] = gis_point_ref(a);
+ self->verts[1] = gis_point_ref(b);
+ self->verts[2] = gis_point_ref(c);
+ self->tex = tex;
+ return self;
+}
+
+void gis_triangle_free(GisTriangle *self)
+{
+ gis_point_unref(self->verts[0]);
+ gis_point_unref(self->verts[1]);
+ gis_point_unref(self->verts[2]);
+ g_free(self);
+}
+
+
+/* GisQuad */
+GisQuad *gis_quad_new(GisPoint *a, GisPoint *b, GisPoint *c, GisPoint *d, guint tex)
+{
+ GisQuad *self = g_new0(GisQuad, 1);
+ gis_point_set_xyz(&GIS_PRIMITIVE(self)->center,
+ (a->x + b->x + c->x + d->x)/4,
+ (a->y + b->y + c->y + d->y)/4,
+ (a->z + b->z + c->z + d->z)/4);
+ self->verts[0] = gis_point_ref(a);
+ self->verts[1] = gis_point_ref(b);
+ self->verts[2] = gis_point_ref(c);
+ self->verts[3] = gis_point_ref(d);
+ self->tex = tex;
+ return self;
+}
+
+void gis_quad_free(GisQuad *self)
+{
+ gis_point_unref(self->verts[0]);
+ gis_point_unref(self->verts[1]);
+ gis_point_unref(self->verts[2]);
+ gis_point_unref(self->verts[3]);
+ g_free(self);
+}
+
+
+/* GisCallback */
+GisCallback *gis_callback_new(GisCallbackFunc callback, gpointer user_data)
+{
+ GisCallback *self = g_new0(GisCallback, 1);
+ self->callback = callback;
+ self->user_data = user_data;
+ return self;
+}
+
+void gis_callback_free(GisCallback *self)
+{
+ g_free(self);
+}