Pileus Git - grits/blob - src/roam.h

   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 #ifndef __ROAM_H__
  19 #define __ROAM_H__
  20
  21 #include "gpqueue.h"
  22
  23 /* Roam */
  24 typedef struct _RoamView     RoamView;
  25 typedef struct _RoamPoint    RoamPoint;
  26 typedef struct _RoamTriangle RoamTriangle;
  27 typedef struct _RoamDiamond  RoamDiamond;
  28 typedef struct _RoamSphere   RoamSphere;
  29 typedef gdouble (*RoamHeightFunc)(gdouble lat, gdouble lon, gpointer user_data);
  30
  31 /* Misc */
  32 struct _RoamView {
  33         gdouble model[16];
  34         gdouble proj[16];
  35         gint view[4];
  36         gint version;
  37 };
  38
  39 /*************
  40  * RoamPoint *
  41  *************/
  42 struct _RoamPoint {
  43         gdouble  x,y,z;     // Model coordinates
  44         gdouble  px,py,pz;  // Projected coordinates
  45         gint     pversion;  // Version of cached projection
  46
  47         gint     tris;      // Associated triangles
  48         gdouble  norm[3];   // Vertex normal
  49
  50         /* For get_intersect */
  51         gdouble  lat, lon;
  52
  53         /* For terrain */
  54         RoamHeightFunc height_func;
  55         gpointer       height_data;
  56 };
  57 RoamPoint *roam_point_new(double x, double y, double z);
  58 void roam_point_add_triangle(RoamPoint *point, RoamTriangle *triangle);
  59 void roam_point_remove_triangle(RoamPoint *point, RoamTriangle *triangle);
  60 void roam_point_update_height(RoamPoint *point);
  61 void roam_point_update_projection(RoamPoint *point, RoamSphere *sphere);
  62
  63 /****************
  64  * RoamTriangle *
  65  ****************/
  66 struct _RoamTriangle {
  67         struct { RoamPoint    *l,*m,*r; } p;
  68         struct { RoamTriangle *l,*b,*r; } t;
  69         RoamPoint *split;
  70         RoamDiamond *parent;
  71         double norm[3];
  72         double error;
  73         GPQueueHandle handle;
  74 };
  75 RoamTriangle *roam_triangle_new(RoamPoint *l, RoamPoint *m, RoamPoint *r);
  76 void roam_triangle_add(RoamTriangle *triangle,
  77                 RoamTriangle *left, RoamTriangle *base, RoamTriangle *right,
  78                 RoamSphere *sphere);
  79 void roam_triangle_remove(RoamTriangle *triangle, RoamSphere *sphere);
  80 void roam_triangle_update_errors(RoamTriangle *triangle, RoamSphere *sphere);
  81 void roam_triangle_split(RoamTriangle *triangle, RoamSphere *sphere);
  82 void roam_triangle_draw_normal(RoamTriangle *triangle);
  83
  84 /***************
  85  * RoamDiamond *
  86  ***************/
  87 struct _RoamDiamond {
  88         RoamTriangle *kids[4];
  89         RoamTriangle *parents[2];
  90         double error;
  91         gboolean active;
  92         GPQueueHandle handle;
  93 };
  94 RoamDiamond *roam_diamond_new(
  95                 RoamTriangle *parent0, RoamTriangle *parent1,
  96                 RoamTriangle *kid0, RoamTriangle *kid1,
  97                 RoamTriangle *kid2, RoamTriangle *kid3);
  98 void roam_diamond_add(RoamDiamond *diamond, RoamSphere *sphere);
  99 void roam_diamond_remove(RoamDiamond *diamond, RoamSphere *sphere);
 100 void roam_diamond_merge(RoamDiamond *diamond, RoamSphere *sphere);
 101 void roam_diamond_update_errors(RoamDiamond *self, RoamSphere *sphere);
 102
 103 /**************
 104  * RoamSphere *
 105  **************/
 106 struct _RoamSphere {
 107         GPQueue *triangles;
 108         GPQueue *diamonds;
 109         RoamView *view;
 110         gint polys;
 111
 112         /* For get_intersect */
 113         RoamTriangle *roots[8];
 114 };
 115 RoamSphere *roam_sphere_new();
 116 void roam_sphere_update_errors(RoamSphere *sphere);
 117 void roam_sphere_split_one(RoamSphere *sphere);
 118 void roam_sphere_merge_one(RoamSphere *sphere);
 119 gint roam_sphere_split_merge(RoamSphere *sphere);
 120 void roam_sphere_draw(RoamSphere *sphere);
 121 void roam_sphere_draw_normals(RoamSphere *sphere);
 122 void roam_sphere_free(RoamSphere *sphere);
 123
 124 #endif