Pileus Git - grits/blob - src/gis-opengl.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 /* Tessellation, "finding intersecting triangles" */
  19 /* http://research.microsoft.com/pubs/70307/tr-2006-81.pdf */
  20 /* http://www.opengl.org/wiki/Alpha_Blending */
  21
  22 #include <config.h>
  23 #include <math.h>
  24 #include <gdk/gdkkeysyms.h>
  25 #include <gtk/gtk.h>
  26 #include <gtk/gtkgl.h>
  27 #include <GL/gl.h>
  28 #include <GL/glu.h>
  29
  30 #include "gis-opengl.h"
  31 #include "roam.h"
  32 #include "wms.h"
  33
  34 #define FOV_DIST   2000.0
  35 #define MPPX(dist) (4*dist/FOV_DIST)
  36
  37 // #define ROAM_DEBUG
  38
  39 /*************
  40  * ROAM Code *
  41  *************/
  42 void roam_queue_draw(WmsCacheNode *node, gpointer _self)
  43 {
  44         gtk_widget_queue_draw(GTK_WIDGET(_self));
  45 }
  46
  47 void roam_height_func(RoamPoint *point, gpointer _self)
  48 {
  49         GisOpenGL *self = _self;
  50
  51         gdouble lat, lon, elev;
  52         xyz2lle(point->x, point->y, point->z, &lat, &lon, &elev);
  53
  54 #ifdef ROAM_DEBUG
  55         lle2xyz(lat, lon, 0, &point->x, &point->y, &point->z);
  56         return;
  57 #endif
  58
  59         gdouble cam_lle[3], cam_xyz[3];
  60         gis_view_get_location(self->view, &cam_lle[0], &cam_lle[1], &cam_lle[2]);
  61         lle2xyz(cam_lle[0], cam_lle[1], cam_lle[2], &cam_xyz[0], &cam_xyz[1], &cam_xyz[2]);
  62
  63         gdouble res = MPPX(distd(cam_xyz, (double*)point));
  64         //g_message("lat=%f, lon=%f, res=%f", lat, lon, res);
  65
  66         point->node = wms_info_fetch_cache(self->srtm, point->node,
  67                         res, lat, lon, NULL, roam_queue_draw, self);
  68
  69         if (point->node) {
  70                 WmsBil *bil = point->node->data;
  71
  72                 gint w = bil->width;
  73                 gint h = bil->height;
  74
  75                 gdouble xmin  = point->node->latlon[0];
  76                 gdouble ymin  = point->node->latlon[1];
  77                 gdouble xmax  = point->node->latlon[2];
  78                 gdouble ymax  = point->node->latlon[3];
  79
  80                 gdouble xdist = xmax - xmin;
  81                 gdouble ydist = ymax - ymin;
  82
  83                 gdouble x =    (lon-xmin)/xdist  * w;
  84                 gdouble y = (1-(lat-ymin)/ydist) * h;
  85
  86                 gdouble x_rem = x - (int)x;
  87                 gdouble y_rem = y - (int)y;
  88                 guint x_flr = (int)x;
  89                 guint y_flr = (int)y;
  90
  91                 /* TODO: Fix interpolation at edges:
  92                  *   - Pad these at the edges instead of wrapping/truncating
  93                  *   - Figure out which pixels to index (is 0,0 edge, center, etc) */
  94                 gint16 px00 = bil->data[MIN((y_flr  ),h-1)*w + MIN((x_flr  ),w-1)];
  95                 gint16 px10 = bil->data[MIN((y_flr  ),h-1)*w + MIN((x_flr+1),w-1)];
  96                 gint16 px01 = bil->data[MIN((y_flr+1),h-1)*w + MIN((x_flr  ),w-1)];
  97                 gint16 px11 = bil->data[MIN((y_flr+1),h-1)*w + MIN((x_flr+1),w-1)];
  98
  99                 elev =  px00 * (1-x_rem) * (1-y_rem) +
 100                         px10 * (  x_rem) * (1-y_rem) +
 101                         px01 * (1-x_rem) * (  y_rem) +
 102                         px11 * (  x_rem) * (  y_rem);
 103                 //g_message("elev=%f -- %hd %hd %hd %hd",
 104                 //      elev, px00, px10, px01, px11);
 105         } else {
 106                 elev = 0;
 107         }
 108
 109         lle2xyz(lat, lon, elev, &point->x, &point->y, &point->z);
 110 }
 111
 112 void roam_tri_func(RoamTriangle *tri, gpointer _self)
 113 {
 114 #ifdef ROAM_DEBUG
 115         glBegin(GL_TRIANGLES);
 116         glNormal3dv(tri->p.r->norm); glVertex3dv((double*)tri->p.r);
 117         glNormal3dv(tri->p.m->norm); glVertex3dv((double*)tri->p.m);
 118         glNormal3dv(tri->p.l->norm); glVertex3dv((double*)tri->p.l);
 119         glEnd();
 120         return;
 121 #endif
 122
 123         GisOpenGL *self = _self;
 124         if (tri->error < 0) return;
 125
 126         /* Get lat-lon min and maxes for the triangle */
 127         gdouble lat[3], lon[3], elev[3];
 128         xyz2lle(tri->p.r->x, tri->p.r->y, tri->p.r->z, &lat[0], &lon[0], &elev[0]);
 129         xyz2lle(tri->p.m->x, tri->p.m->y, tri->p.m->z, &lat[1], &lon[1], &elev[1]);
 130         xyz2lle(tri->p.l->x, tri->p.l->y, tri->p.l->z, &lat[2], &lon[2], &elev[2]);
 131         gdouble lat_max = MAX(MAX(lat[0], lat[1]), lat[2]);
 132         gdouble lat_min = MIN(MIN(lat[0], lat[1]), lat[2]);
 133         gdouble lat_avg = (lat_min+lat_max)/2;
 134         gdouble lon_max = MAX(MAX(lon[0], lon[1]), lon[2]);
 135         gdouble lon_min = MIN(MIN(lon[0], lon[1]), lon[2]);
 136         gdouble lon_avg = (lon_min+lon_max)/2;
 137
 138         /* Get target resolution */
 139         gdouble cam_lle[3], cam_xyz[3];
 140         gis_view_get_location(self->view, &cam_lle[0], &cam_lle[1], &cam_lle[2]);
 141         lle2xyz(cam_lle[0], cam_lle[1], cam_lle[2], &cam_xyz[0], &cam_xyz[1], &cam_xyz[2]);
 142         gdouble distr = distd(cam_xyz, (double*)tri->p.r);
 143         gdouble distm = distd(cam_xyz, (double*)tri->p.m);
 144         gdouble distl = distd(cam_xyz, (double*)tri->p.l);
 145         double res = MPPX(MIN(MIN(distr, distm), distl));
 146
 147         /* TODO:
 148          *   - Fetch needed textures, not all corners
 149          *   - Also fetch center textures that aren't touched by a corner
 150          *   - Idea: send {lat,lon}{min,max} to fetch_cache and handle it in the recursion */
 151         /* Fetch textures */
 152         tri->nodes[0] = wms_info_fetch_cache(self->bmng, tri->nodes[0], res, lat_min, lon_min, NULL, roam_queue_draw, self);
 153         tri->nodes[1] = wms_info_fetch_cache(self->bmng, tri->nodes[1], res, lat_max, lon_min, NULL, roam_queue_draw, self);
 154         tri->nodes[2] = wms_info_fetch_cache(self->bmng, tri->nodes[2], res, lat_min, lon_max, NULL, roam_queue_draw, self);
 155         tri->nodes[3] = wms_info_fetch_cache(self->bmng, tri->nodes[3], res, lat_max, lon_max, NULL, roam_queue_draw, self);
 156         tri->nodes[4] = wms_info_fetch_cache(self->bmng, tri->nodes[4], res, lat_avg, lon_avg, NULL, roam_queue_draw, self);
 157         /* Hopefully get all textures at the same resolution to prevent overlaps */
 158         //gdouble maxres = 0;
 159         //for (int i = 0; i < 5; i++)
 160         //      if (tri->nodes[i] && tri->nodes[i]->res > maxres)
 161         //              maxres = tri->nodes[i]->res;
 162         //if (maxres != 0) {
 163         //      tri->nodes[0] = wms_info_fetch_cache(self->bmng, tri->nodes[0], maxres, lat_min, lon_min, NULL, roam_queue_draw, self);
 164         //      tri->nodes[1] = wms_info_fetch_cache(self->bmng, tri->nodes[1], maxres, lat_max, lon_min, NULL, roam_queue_draw, self);
 165         //      tri->nodes[2] = wms_info_fetch_cache(self->bmng, tri->nodes[2], maxres, lat_min, lon_max, NULL, roam_queue_draw, self);
 166         //      tri->nodes[3] = wms_info_fetch_cache(self->bmng, tri->nodes[3], maxres, lat_max, lon_max, NULL, roam_queue_draw, self);
 167         //      tri->nodes[4] = wms_info_fetch_cache(self->bmng, tri->nodes[4], maxres, lat_avg, lon_avg, NULL, roam_queue_draw, self);
 168         //}
 169
 170         /* Vertex color for hieght map viewing, 8848m == Everest */
 171         gfloat colors[] = {
 172                 (elev[0]-EARTH_R)/8848,
 173                 (elev[1]-EARTH_R)/8848,
 174                 (elev[2]-EARTH_R)/8848,
 175         };
 176
 177         /* Draw each texture */
 178         /* TODO: Prevent double exposure when of hi-res textures on top of
 179          * low-res textures when some high-res textures are not yet loaded. */
 180         glBlendFunc(GL_ONE, GL_ZERO);
 181         for (int i = 0; i < 5; i++) {
 182                 /* Skip missing textures */
 183                 if (tri->nodes[i] == NULL)
 184                         continue;
 185                 /* Skip already drawn textures */
 186                 switch (i) {
 187                 case 4: if (tri->nodes[i] == tri->nodes[3]) continue;
 188                 case 3: if (tri->nodes[i] == tri->nodes[2]) continue;
 189                 case 2: if (tri->nodes[i] == tri->nodes[1]) continue;
 190                 case 1: if (tri->nodes[i] == tri->nodes[0]) continue;
 191                 }
 192
 193                 WmsCacheNode *node = tri->nodes[i];
 194
 195                 if (node->latlon[0] == -180) {
 196                         if (lon[0] < -90 || lon[1] < -90 || lon[2] < -90) {
 197                                 if (lon[0] > 90) lon[0] -= 360;
 198                                 if (lon[1] > 90) lon[1] -= 360;
 199                                 if (lon[2] > 90) lon[2] -= 360;
 200                         }
 201                 } else if (node->latlon[2] == 180.0) {
 202                         if (lon[0] < -90) lon[0] += 360;
 203                         if (lon[1] < -90) lon[1] += 360;
 204                         if (lon[2] < -90) lon[2] += 360;
 205                 }
 206
 207                 gdouble xmin  = node->latlon[0];
 208                 gdouble ymin  = node->latlon[1];
 209                 gdouble xmax  = node->latlon[2];
 210                 gdouble ymax  = node->latlon[3];
 211
 212                 gdouble xdist = xmax - xmin;
 213                 gdouble ydist = ymax - ymin;
 214
 215                 gdouble xy[][3] = {
 216                         {(lon[0]-xmin)/xdist, 1-(lat[0]-ymin)/ydist},
 217                         {(lon[1]-xmin)/xdist, 1-(lat[1]-ymin)/ydist},
 218                         {(lon[2]-xmin)/xdist, 1-(lat[2]-ymin)/ydist},
 219                 };
 220
 221                 glBindTexture(GL_TEXTURE_2D, *(guint*)node->data);
 222
 223                 glBegin(GL_TRIANGLES);
 224                 glColor3fv(colors); glNormal3dv(tri->p.r->norm); glTexCoord2dv(xy[0]); glVertex3dv((double*)tri->p.r);
 225                 glColor3fv(colors); glNormal3dv(tri->p.m->norm); glTexCoord2dv(xy[1]); glVertex3dv((double*)tri->p.m);
 226                 glColor3fv(colors); glNormal3dv(tri->p.l->norm); glTexCoord2dv(xy[2]); glVertex3dv((double*)tri->p.l);
 227                 glEnd();
 228                 glBlendFunc(GL_ONE, GL_ONE);
 229         }
 230 }
 231
 232 static void set_camera(GisOpenGL *self)
 233 {
 234         glMatrixMode(GL_MODELVIEW);
 235         glLoadIdentity();
 236         double lat, lon, elev, rx, ry, rz;
 237         gis_view_get_location(self->view, &lat, &lon, &elev);
 238         gis_view_get_rotation(self->view, &rx, &ry, &rz);
 239         glRotatef(rx, 1, 0, 0);
 240         glRotatef(rz, 0, 0, 1);
 241         glTranslatef(0, 0, -elev2rad(elev));
 242         glRotatef(lat, 1, 0, 0);
 243         glRotatef(-lon, 0, 1, 0);
 244 }
 245
 246 static void set_visuals(GisOpenGL *self)
 247 {
 248         /* Lighting */
 249         glMatrixMode(GL_MODELVIEW);
 250         glLoadIdentity();
 251 #ifdef ROAM_DEBUG
 252         float light_ambient[]  = {0.7f, 0.7f, 0.7f, 1.0f};
 253         float light_diffuse[]  = {2.0f, 2.0f, 2.0f, 1.0f};
 254 #else
 255         float light_ambient[]  = {0.2f, 0.2f, 0.2f, 1.0f};
 256         float light_diffuse[]  = {5.0f, 5.0f, 5.0f, 1.0f};
 257 #endif
 258         float light_position[] = {-13*EARTH_R, 1*EARTH_R, 3*EARTH_R, 1.0f};
 259         glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
 260         glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
 261         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
 262         glEnable(GL_LIGHT0);
 263         glEnable(GL_LIGHTING);
 264
 265         float material_ambient[]  = {0.2, 0.2, 0.2, 1.0};
 266         float material_diffuse[]  = {0.8, 0.8, 0.8, 1.0};
 267         float material_specular[] = {0.0, 0.0, 0.0, 1.0};
 268         float material_emission[] = {0.0, 0.0, 0.0, 1.0};
 269         glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT,  material_ambient);
 270         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE,  material_diffuse);
 271         glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, material_specular);
 272         glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, material_emission);
 273         glDisable(GL_TEXTURE_2D);
 274         glDisable(GL_COLOR_MATERIAL);
 275
 276         /* Camera */
 277         set_camera(self);
 278
 279         /* Misc */
 280         gdouble lat, lon, elev;
 281         gis_view_get_location(self->view, &lat, &lon, &elev);
 282         gdouble rg   = MAX(0, 1-(elev/20000));
 283         gdouble blue = MAX(0, 1-(elev/50000));
 284         glClearColor(MIN(0.65,rg), MIN(0.65,rg), MIN(1,blue), 1.0f);
 285
 286         glDisable(GL_ALPHA_TEST);
 287
 288         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 289         glEnable(GL_BLEND);
 290
 291 #ifndef ROAM_DEBUG
 292         glCullFace(GL_BACK);
 293         glEnable(GL_CULL_FACE);
 294 #endif
 295
 296         glClearDepth(1.0);
 297         glDepthFunc(GL_LEQUAL);
 298         glEnable(GL_DEPTH_TEST);
 299
 300         glEnable(GL_LINE_SMOOTH);
 301
 302         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 303         //glShadeModel(GL_FLAT);
 304 }
 305
 306
 307 /*************
 308  * Callbacks *
 309  *************/
 310 static void on_realize(GisOpenGL *self, gpointer _)
 311 {
 312         set_visuals(self);
 313 }
 314 static gboolean on_configure(GisOpenGL *self, GdkEventConfigure *event, gpointer _)
 315 {
 316         g_debug("GisOpenGL: on_confiure");
 317         gis_opengl_begin(self);
 318
 319         double width  = GTK_WIDGET(self)->allocation.width;
 320         double height = GTK_WIDGET(self)->allocation.height;
 321         glViewport(0, 0, width, height);
 322
 323         glMatrixMode(GL_PROJECTION);
 324         glLoadIdentity();
 325         double ang = atan(height/FOV_DIST);
 326         gluPerspective(rad2deg(ang)*2, width/height, 1, 20*EARTH_R);
 327
 328 #ifndef ROAM_DEBUG
 329         roam_sphere_update(self->sphere);
 330 #endif
 331
 332         gis_opengl_end(self);
 333         return FALSE;
 334 }
 335
 336 static void on_expose_plugin(GisPlugin *plugin, gchar *name, GisOpenGL *self)
 337 {
 338         set_visuals(self);
 339         glMatrixMode(GL_PROJECTION); glPushMatrix();
 340         glMatrixMode(GL_MODELVIEW);  glPushMatrix();
 341         gis_plugin_expose(plugin);
 342         glMatrixMode(GL_PROJECTION); glPopMatrix();
 343         glMatrixMode(GL_MODELVIEW);  glPopMatrix();
 344 }
 345 static gboolean on_expose(GisOpenGL *self, GdkEventExpose *event, gpointer _)
 346 {
 347         g_debug("GisOpenGL: on_expose - begin");
 348         gis_opengl_begin(self);
 349
 350         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 351
 352 #ifndef ROAM_DEBUG
 353         set_visuals(self);
 354         glEnable(GL_TEXTURE_2D);
 355         roam_sphere_draw(self->sphere);
 356 #endif
 357
 358 #ifdef  ROAM_DEBUG
 359         set_visuals(self);
 360         glColor4f(0.0, 0.0, 9.0, 0.6);
 361         glDisable(GL_TEXTURE_2D);
 362         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 363         roam_sphere_draw(self->sphere);
 364 #endif
 365
 366         //glDisable(GL_TEXTURE_2D);
 367         //glEnable(GL_COLOR_MATERIAL);
 368         //glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 369         //roam_sphere_draw(self->sphere);
 370
 371         gis_plugins_foreach(self->plugins, G_CALLBACK(on_expose_plugin), self);
 372
 373         set_visuals(self);
 374         gis_opengl_end(self);
 375         gis_opengl_flush(self);
 376         g_debug("GisOpenGL: on_expose - end\n");
 377         return FALSE;
 378 }
 379
 380 static gboolean on_button_press(GisOpenGL *self, GdkEventButton *event, gpointer _)
 381 {
 382         g_debug("GisOpenGL: on_button_press - Grabbing focus");
 383         gtk_widget_grab_focus(GTK_WIDGET(self));
 384         return TRUE;
 385 }
 386
 387 static gboolean on_key_press(GisOpenGL *self, GdkEventKey *event, gpointer _)
 388 {
 389         g_debug("GisOpenGL: on_key_press - key=%x, state=%x, plus=%x",
 390                         event->keyval, event->state, GDK_plus);
 391
 392         double lat, lon, elev, pan;
 393         gis_view_get_location(self->view, &lat, &lon, &elev);
 394         pan = MIN(elev/(EARTH_R/2), 30);
 395         guint kv = event->keyval;
 396         if      (kv == GDK_Left  || kv == GDK_h) gis_view_pan(self->view,  0,  -pan, 0);
 397         else if (kv == GDK_Down  || kv == GDK_j) gis_view_pan(self->view, -pan, 0,   0);
 398         else if (kv == GDK_Up    || kv == GDK_k) gis_view_pan(self->view,  pan, 0,   0);
 399         else if (kv == GDK_Right || kv == GDK_l) gis_view_pan(self->view,  0,   pan, 0);
 400         else if (kv == GDK_minus || kv == GDK_o) gis_view_zoom(self->view, 10./9);
 401         else if (kv == GDK_plus  || kv == GDK_i) gis_view_zoom(self->view, 9./10);
 402         else if (kv == GDK_H) gis_view_rotate(self->view,  0,  0, -10);
 403         else if (kv == GDK_J) gis_view_rotate(self->view,  10, 0,  0);
 404         else if (kv == GDK_K) gis_view_rotate(self->view, -10, 0,  0);
 405         else if (kv == GDK_L) gis_view_rotate(self->view,  0,  0,  10);
 406
 407         /* Testing */
 408 #ifdef ROAM_DEBUG
 409         else if (kv == GDK_n) roam_sphere_split_one(self->sphere);
 410         else if (kv == GDK_p) roam_sphere_merge_one(self->sphere);
 411         else if (kv == GDK_r) roam_sphere_split_merge(self->sphere);
 412         else if (kv == GDK_u) roam_sphere_update(self->sphere);
 413         gtk_widget_queue_draw(GTK_WIDGET(self));
 414 #endif
 415
 416         return TRUE;
 417 }
 418
 419 static void on_view_changed(GisView *view,
 420                 gdouble _1, gdouble _2, gdouble _3, GisOpenGL *self)
 421 {
 422         gis_opengl_begin(self);
 423         set_visuals(self);
 424 #ifndef ROAM_DEBUG
 425         roam_sphere_update(self->sphere);
 426 #endif
 427         gis_opengl_redraw(self);
 428         gis_opengl_end(self);
 429 }
 430
 431 static gboolean on_idle(GisOpenGL *self)
 432 {
 433         gis_opengl_begin(self);
 434         if (roam_sphere_split_merge(self->sphere))
 435                 gis_opengl_redraw(self);
 436         gis_opengl_end(self);
 437         return TRUE;
 438 }
 439
 440
 441 /***********
 442  * Methods *
 443  ***********/
 444 GisOpenGL *gis_opengl_new(GisWorld *world, GisView *view, GisPlugins *plugins)
 445 {
 446         g_debug("GisOpenGL: new");
 447         GisOpenGL *self = g_object_new(GIS_TYPE_OPENGL, NULL);
 448         self->world   = world;
 449         self->view    = view;
 450         self->plugins = plugins;
 451         g_object_ref(world);
 452         g_object_ref(view);
 453
 454         g_signal_connect(self->view, "location-changed", G_CALLBACK(on_view_changed), self);
 455         g_signal_connect(self->view, "rotation-changed", G_CALLBACK(on_view_changed), self);
 456
 457         /* TODO: update point eights sometime later so we have heigh-res heights for them */
 458         self->sphere = roam_sphere_new(roam_tri_func, roam_height_func, self);
 459
 460         return g_object_ref(self);
 461 }
 462
 463 void gis_opengl_center_position(GisOpenGL *self, gdouble lat, gdouble lon, gdouble elev)
 464 {
 465         set_camera(self);
 466         glRotatef(lon, 0, 1, 0);
 467         glRotatef(-lat, 1, 0, 0);
 468         glTranslatef(0, 0, elev2rad(elev));
 469 }
 470
 471 void gis_opengl_redraw(GisOpenGL *self)
 472 {
 473         g_debug("GisOpenGL: gl_redraw");
 474         gtk_widget_queue_draw(GTK_WIDGET(self));
 475 }
 476 void gis_opengl_begin(GisOpenGL *self)
 477 {
 478         g_assert(GIS_IS_OPENGL(self));
 479
 480         GdkGLContext   *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(self));
 481         GdkGLDrawable  *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
 482
 483         if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
 484                 g_assert_not_reached();
 485 }
 486 void gis_opengl_end(GisOpenGL *self)
 487 {
 488         g_assert(GIS_IS_OPENGL(self));
 489         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
 490         gdk_gl_drawable_gl_end(gldrawable);
 491 }
 492 void gis_opengl_flush(GisOpenGL *self)
 493 {
 494         g_assert(GIS_IS_OPENGL(self));
 495         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
 496         if (gdk_gl_drawable_is_double_buffered(gldrawable))
 497                 gdk_gl_drawable_swap_buffers(gldrawable);
 498         else
 499                 glFlush();
 500         gdk_gl_drawable_gl_end(gldrawable);
 501 }
 502
 503
 504 /****************
 505  * GObject code *
 506  ****************/
 507 G_DEFINE_TYPE(GisOpenGL, gis_opengl, GTK_TYPE_DRAWING_AREA);
 508 static void gis_opengl_init(GisOpenGL *self)
 509 {
 510         g_debug("GisOpenGL: init");
 511         self->bmng = wms_info_new_for_bmng(NULL, NULL);
 512         self->srtm = wms_info_new_for_srtm(NULL, NULL);
 513
 514         /* OpenGL setup */
 515         GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
 516                         GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
 517                         GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
 518         if (!glconfig)
 519                 g_error("Failed to create glconfig");
 520         if (!gtk_widget_set_gl_capability(GTK_WIDGET(self),
 521                                 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
 522                 g_error("GL lacks required capabilities");
 523         g_object_unref(glconfig);
 524
 525         gtk_widget_set_size_request(GTK_WIDGET(self), 600, 550);
 526         gtk_widget_set_events(GTK_WIDGET(self),
 527                         GDK_BUTTON_PRESS_MASK |
 528                         GDK_ENTER_NOTIFY_MASK |
 529                         GDK_KEY_PRESS_MASK);
 530         g_object_set(self, "can-focus", TRUE, NULL);
 531
 532 #ifndef ROAM_DEBUG
 533         self->sm_source = g_timeout_add(10, (GSourceFunc)on_idle, self);
 534 #endif
 535
 536         g_signal_connect(self, "realize",            G_CALLBACK(on_realize),      NULL);
 537         g_signal_connect(self, "configure-event",    G_CALLBACK(on_configure),    NULL);
 538         g_signal_connect(self, "expose-event",       G_CALLBACK(on_expose),       NULL);
 539
 540         g_signal_connect(self, "button-press-event", G_CALLBACK(on_button_press), NULL);
 541         g_signal_connect(self, "enter-notify-event", G_CALLBACK(on_button_press), NULL);
 542         g_signal_connect(self, "key-press-event",    G_CALLBACK(on_key_press),    NULL);
 543 }
 544 static GObject *gis_opengl_constructor(GType gtype, guint n_properties,
 545                 GObjectConstructParam *properties)
 546 {
 547         g_debug("GisOpengl: constructor");
 548         GObjectClass *parent_class = G_OBJECT_CLASS(gis_opengl_parent_class);
 549         return parent_class->constructor(gtype, n_properties, properties);
 550 }
 551 static void gis_opengl_dispose(GObject *_self)
 552 {
 553         g_debug("GisOpenGL: dispose");
 554         GisOpenGL *self = GIS_OPENGL(_self);
 555         if (self->sm_source) {
 556                 g_source_remove(self->sm_source);
 557                 self->sm_source = 0;
 558         }
 559         if (self->sphere) {
 560                 roam_sphere_free(self->sphere);
 561                 self->sphere = NULL;
 562         }
 563         if (self->world) {
 564                 g_object_unref(self->world);
 565                 self->world = NULL;
 566         }
 567         if (self->view) {
 568                 g_object_unref(self->view);
 569                 self->view = NULL;
 570         }
 571         G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_self);
 572 }
 573 static void gis_opengl_finalize(GObject *_self)
 574 {
 575         g_debug("GisOpenGL: finalize");
 576         GisOpenGL *self = GIS_OPENGL(_self);
 577         wms_info_free(self->bmng);
 578         wms_info_free(self->srtm);
 579         G_OBJECT_CLASS(gis_opengl_parent_class)->finalize(_self);
 580 }
 581 static void gis_opengl_class_init(GisOpenGLClass *klass)
 582 {
 583         g_debug("GisOpenGL: class_init");
 584         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 585         gobject_class->constructor  = gis_opengl_constructor;
 586         gobject_class->dispose      = gis_opengl_dispose;
 587         gobject_class->finalize     = gis_opengl_finalize;
 588 }