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 static void set_visuals(GisOpenGL *self)
  43 {
  44         glMatrixMode(GL_MODELVIEW);
  45         glLoadIdentity();
  46
  47         /* Camera 1 */
  48         double lat, lon, elev, rx, ry, rz;
  49         gis_view_get_location(self->view, &lat, &lon, &elev);
  50         gis_view_get_rotation(self->view, &rx, &ry, &rz);
  51         glRotatef(rx, 1, 0, 0);
  52         glRotatef(rz, 0, 0, 1);
  53
  54         /* Lighting */
  55 #ifdef ROAM_DEBUG
  56         float light_ambient[]  = {0.7f, 0.7f, 0.7f, 1.0f};
  57         float light_diffuse[]  = {2.0f, 2.0f, 2.0f, 1.0f};
  58 #else
  59         float light_ambient[]  = {0.2f, 0.2f, 0.2f, 1.0f};
  60         float light_diffuse[]  = {5.0f, 5.0f, 5.0f, 1.0f};
  61 #endif
  62         float light_position[] = {-13*EARTH_R, 1*EARTH_R, 3*EARTH_R, 1.0f};
  63         glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
  64         glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
  65         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  66         glEnable(GL_LIGHT0);
  67         glEnable(GL_LIGHTING);
  68
  69         float material_ambient[]  = {0.2, 0.2, 0.2, 1.0};
  70         float material_diffuse[]  = {0.8, 0.8, 0.8, 1.0};
  71         float material_specular[] = {0.0, 0.0, 0.0, 1.0};
  72         float material_emission[] = {0.0, 0.0, 0.0, 1.0};
  73         glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT,  material_ambient);
  74         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE,  material_diffuse);
  75         glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, material_specular);
  76         glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, material_emission);
  77         glDisable(GL_TEXTURE_2D);
  78         glDisable(GL_COLOR_MATERIAL);
  79
  80         /* Camera 2 */
  81         glTranslatef(0, 0, -elev2rad(elev));
  82         glRotatef(lat, 1, 0, 0);
  83         glRotatef(-lon, 0, 1, 0);
  84
  85         /* Misc */
  86         gdouble rg   = MAX(0, 1-(elev/20000));
  87         gdouble blue = MAX(0, 1-(elev/50000));
  88         glClearColor(MIN(0.65,rg), MIN(0.65,rg), MIN(1,blue), 1.0f);
  89
  90         glDisable(GL_ALPHA_TEST);
  91
  92         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  93         glEnable(GL_BLEND);
  94
  95 #ifndef ROAM_DEBUG
  96         glCullFace(GL_BACK);
  97         glEnable(GL_CULL_FACE);
  98 #endif
  99
 100         glClearDepth(1.0);
 101         glDepthFunc(GL_LEQUAL);
 102         glEnable(GL_DEPTH_TEST);
 103
 104         glEnable(GL_LINE_SMOOTH);
 105
 106         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 107         //glShadeModel(GL_FLAT);
 108 }
 109
 110
 111 /*************
 112  * Callbacks *
 113  *************/
 114 static void on_realize(GisOpenGL *self, gpointer _)
 115 {
 116         g_debug("GisOpenGL: on_realize");
 117         set_visuals(self);
 118         roam_sphere_update_errors(self->sphere);
 119 }
 120 static gboolean on_configure(GisOpenGL *self, GdkEventConfigure *event, gpointer _)
 121 {
 122         g_debug("GisOpenGL: on_configure");
 123         gis_opengl_begin(self);
 124
 125         double width  = GTK_WIDGET(self)->allocation.width;
 126         double height = GTK_WIDGET(self)->allocation.height;
 127         glViewport(0, 0, width, height);
 128
 129         glMatrixMode(GL_PROJECTION);
 130         glLoadIdentity();
 131         double ang = atan(height/FOV_DIST);
 132         gluPerspective(rad2deg(ang)*2, width/height, 1, 20*EARTH_R);
 133
 134 #ifndef ROAM_DEBUG
 135         roam_sphere_update_errors(self->sphere);
 136 #endif
 137
 138         gis_opengl_end(self);
 139         return FALSE;
 140 }
 141
 142 static void on_expose_plugin(GisPlugin *plugin, gchar *name, GisOpenGL *self)
 143 {
 144         set_visuals(self);
 145         glMatrixMode(GL_PROJECTION); glPushMatrix();
 146         glMatrixMode(GL_MODELVIEW);  glPushMatrix();
 147         gis_plugin_expose(plugin);
 148         glMatrixMode(GL_PROJECTION); glPopMatrix();
 149         glMatrixMode(GL_MODELVIEW);  glPopMatrix();
 150 }
 151 static gboolean on_expose(GisOpenGL *self, GdkEventExpose *event, gpointer _)
 152 {
 153         g_debug("GisOpenGL: on_expose - begin");
 154         gis_opengl_begin(self);
 155
 156         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 157
 158 #ifndef ROAM_DEBUG
 159         gis_plugins_foreach(self->plugins, G_CALLBACK(on_expose_plugin), self);
 160
 161         if (self->wireframe) {
 162                 set_visuals(self);
 163                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 164                 roam_sphere_draw(self->sphere);
 165         }
 166 #else
 167         set_visuals(self);
 168         glColor4f(0.0, 0.0, 9.0, 0.6);
 169         glDisable(GL_TEXTURE_2D);
 170         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 171         roam_sphere_draw(self->sphere);
 172
 173         //roam_sphere_draw_normals(self->sphere);
 174 #endif
 175
 176         set_visuals(self);
 177         gis_opengl_end(self);
 178         gis_opengl_flush(self);
 179         g_debug("GisOpenGL: on_expose - end\n");
 180         return FALSE;
 181 }
 182
 183 static gboolean on_button_press(GisOpenGL *self, GdkEventButton *event, gpointer _)
 184 {
 185         g_debug("GisOpenGL: on_button_press - Grabbing focus");
 186         gtk_widget_grab_focus(GTK_WIDGET(self));
 187         return TRUE;
 188 }
 189
 190 static gboolean on_key_press(GisOpenGL *self, GdkEventKey *event, gpointer _)
 191 {
 192         g_debug("GisOpenGL: on_key_press - key=%x, state=%x, plus=%x",
 193                         event->keyval, event->state, GDK_plus);
 194
 195         double lat, lon, elev, pan;
 196         gis_view_get_location(self->view, &lat, &lon, &elev);
 197         pan = MIN(elev/(EARTH_R/2), 30);
 198         guint kv = event->keyval;
 199         if      (kv == GDK_Left  || kv == GDK_h) gis_view_pan(self->view,  0,  -pan, 0);
 200         else if (kv == GDK_Down  || kv == GDK_j) gis_view_pan(self->view, -pan, 0,   0);
 201         else if (kv == GDK_Up    || kv == GDK_k) gis_view_pan(self->view,  pan, 0,   0);
 202         else if (kv == GDK_Right || kv == GDK_l) gis_view_pan(self->view,  0,   pan, 0);
 203         else if (kv == GDK_minus || kv == GDK_o) gis_view_zoom(self->view, 10./9);
 204         else if (kv == GDK_plus  || kv == GDK_i) gis_view_zoom(self->view, 9./10);
 205         else if (kv == GDK_H) gis_view_rotate(self->view,  0, 0, -2);
 206         else if (kv == GDK_J) gis_view_rotate(self->view,  2, 0,  0);
 207         else if (kv == GDK_K) gis_view_rotate(self->view, -2, 0,  0);
 208         else if (kv == GDK_L) gis_view_rotate(self->view,  0, 0,  2);
 209
 210         /* Testing */
 211         else if (kv == GDK_w) {self->wireframe = !self->wireframe; gtk_widget_queue_draw(GTK_WIDGET(self));}
 212 #ifdef ROAM_DEBUG
 213         else if (kv == GDK_n) roam_sphere_split_one(self->sphere);
 214         else if (kv == GDK_p) roam_sphere_merge_one(self->sphere);
 215         else if (kv == GDK_r) roam_sphere_split_merge(self->sphere);
 216         else if (kv == GDK_u) roam_sphere_update_errors(self->sphere);
 217         gtk_widget_queue_draw(GTK_WIDGET(self));
 218 #endif
 219
 220         return TRUE;
 221 }
 222
 223 static void on_view_changed(GisView *view,
 224                 gdouble _1, gdouble _2, gdouble _3, GisOpenGL *self)
 225 {
 226         g_debug("GisOpenGL: on_view_changed");
 227         gis_opengl_begin(self);
 228         set_visuals(self);
 229 #ifndef ROAM_DEBUG
 230         roam_sphere_update_errors(self->sphere);
 231 #endif
 232         gis_opengl_redraw(self);
 233         gis_opengl_end(self);
 234 }
 235
 236 static gboolean on_idle(GisOpenGL *self)
 237 {
 238         //g_debug("GisOpenGL: on_idle");
 239         gis_opengl_begin(self);
 240         if (roam_sphere_split_merge(self->sphere))
 241                 gis_opengl_redraw(self);
 242         gis_opengl_end(self);
 243         return TRUE;
 244 }
 245
 246
 247 /***********
 248  * Methods *
 249  ***********/
 250 GisOpenGL *gis_opengl_new(GisWorld *world, GisView *view, GisPlugins *plugins)
 251 {
 252         g_debug("GisOpenGL: new");
 253         GisOpenGL *self = g_object_new(GIS_TYPE_OPENGL, NULL);
 254         self->world   = world;
 255         self->view    = view;
 256         self->plugins = plugins;
 257         g_object_ref(world);
 258         g_object_ref(view);
 259
 260         g_signal_connect(self->view, "location-changed", G_CALLBACK(on_view_changed), self);
 261         g_signal_connect(self->view, "rotation-changed", G_CALLBACK(on_view_changed), self);
 262
 263         self->sphere = roam_sphere_new(self);
 264
 265         return g_object_ref(self);
 266 }
 267
 268 void gis_opengl_center_position(GisOpenGL *self, gdouble lat, gdouble lon, gdouble elev)
 269 {
 270         glRotatef(lon, 0, 1, 0);
 271         glRotatef(-lat, 1, 0, 0);
 272         glTranslatef(0, 0, elev2rad(elev));
 273 }
 274
 275 void gis_opengl_redraw(GisOpenGL *self)
 276 {
 277         g_debug("GisOpenGL: redraw");
 278         gtk_widget_queue_draw(GTK_WIDGET(self));
 279 }
 280 void gis_opengl_begin(GisOpenGL *self)
 281 {
 282         g_assert(GIS_IS_OPENGL(self));
 283
 284         GdkGLContext   *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(self));
 285         GdkGLDrawable  *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
 286
 287         if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
 288                 g_assert_not_reached();
 289 }
 290 void gis_opengl_end(GisOpenGL *self)
 291 {
 292         g_assert(GIS_IS_OPENGL(self));
 293         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
 294         gdk_gl_drawable_gl_end(gldrawable);
 295 }
 296 void gis_opengl_flush(GisOpenGL *self)
 297 {
 298         g_assert(GIS_IS_OPENGL(self));
 299         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
 300         if (gdk_gl_drawable_is_double_buffered(gldrawable))
 301                 gdk_gl_drawable_swap_buffers(gldrawable);
 302         else
 303                 glFlush();
 304         gdk_gl_drawable_gl_end(gldrawable);
 305 }
 306
 307
 308 /****************
 309  * GObject code *
 310  ****************/
 311 G_DEFINE_TYPE(GisOpenGL, gis_opengl, GTK_TYPE_DRAWING_AREA);
 312 static void gis_opengl_init(GisOpenGL *self)
 313 {
 314         g_debug("GisOpenGL: init");
 315         /* OpenGL setup */
 316         GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
 317                         GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
 318                         GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
 319         if (!glconfig)
 320                 g_error("Failed to create glconfig");
 321         if (!gtk_widget_set_gl_capability(GTK_WIDGET(self),
 322                                 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
 323                 g_error("GL lacks required capabilities");
 324         g_object_unref(glconfig);
 325
 326         gtk_widget_set_size_request(GTK_WIDGET(self), 600, 550);
 327         gtk_widget_set_events(GTK_WIDGET(self),
 328                         GDK_BUTTON_PRESS_MASK |
 329                         GDK_ENTER_NOTIFY_MASK |
 330                         GDK_KEY_PRESS_MASK);
 331         g_object_set(self, "can-focus", TRUE, NULL);
 332
 333 #ifndef ROAM_DEBUG
 334         self->sm_source = g_timeout_add(10, (GSourceFunc)on_idle, self);
 335 #endif
 336
 337         g_signal_connect(self, "realize",            G_CALLBACK(on_realize),      NULL);
 338         g_signal_connect(self, "configure-event",    G_CALLBACK(on_configure),    NULL);
 339         g_signal_connect(self, "expose-event",       G_CALLBACK(on_expose),       NULL);
 340
 341         g_signal_connect(self, "button-press-event", G_CALLBACK(on_button_press), NULL);
 342         g_signal_connect(self, "enter-notify-event", G_CALLBACK(on_button_press), NULL);
 343         g_signal_connect(self, "key-press-event",    G_CALLBACK(on_key_press),    NULL);
 344 }
 345 static GObject *gis_opengl_constructor(GType gtype, guint n_properties,
 346                 GObjectConstructParam *properties)
 347 {
 348         g_debug("GisOpengl: constructor");
 349         GObjectClass *parent_class = G_OBJECT_CLASS(gis_opengl_parent_class);
 350         return parent_class->constructor(gtype, n_properties, properties);
 351 }
 352 static void gis_opengl_dispose(GObject *_self)
 353 {
 354         g_debug("GisOpenGL: dispose");
 355         GisOpenGL *self = GIS_OPENGL(_self);
 356         if (self->sm_source) {
 357                 g_source_remove(self->sm_source);
 358                 self->sm_source = 0;
 359         }
 360         if (self->sphere) {
 361                 roam_sphere_free(self->sphere);
 362                 self->sphere = NULL;
 363         }
 364         if (self->world) {
 365                 g_object_unref(self->world);
 366                 self->world = NULL;
 367         }
 368         if (self->view) {
 369                 g_object_unref(self->view);
 370                 self->view = NULL;
 371         }
 372         G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_self);
 373 }
 374 static void gis_opengl_finalize(GObject *_self)
 375 {
 376         g_debug("GisOpenGL: finalize");
 377         GisOpenGL *self = GIS_OPENGL(_self);
 378         G_OBJECT_CLASS(gis_opengl_parent_class)->finalize(_self);
 379 }
 380 static void gis_opengl_class_init(GisOpenGLClass *klass)
 381 {
 382         g_debug("GisOpenGL: class_init");
 383         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 384         gobject_class->constructor  = gis_opengl_constructor;
 385         gobject_class->dispose      = gis_opengl_dispose;
 386         gobject_class->finalize     = gis_opengl_finalize;
 387 }