+++ /dev/null
-/*
- * Copyright (C) 2009-2010 Andy Spencer <andy753421@gmail.com>
- *
- * 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/>.
- */
-
-/**
- * SECTION:gis-opengl
- * @short_description: OpenGL based virtual globe
- *
- * #GisOpenGL is the core rendering engine used by libgis. Theoretically other
- * renderers could be writte, but they have not been. GisOpenGL uses the ROAM
- * algorithm for updating surface mesh the planet. The only thing GisOpenGL can
- * actually render on it's own is a wireframe of a sphere.
- *
- * GisOpenGL relies on #GtkGlExt and requires (at least) OpenGL 2.0.
- */
-
-#include <config.h>
-#include <math.h>
-#include <string.h>
-#include <gdk/gdkkeysyms.h>
-#include <gtk/gtk.h>
-#include <gtk/gtkgl.h>
-#include <GL/gl.h>
-#include <GL/glu.h>
-
-#include "gis-opengl.h"
-#include "gis-util.h"
-#include "roam.h"
-
-// #define ROAM_DEBUG
-
-/* Tessellation, "finding intersecting triangles" */
-/* http://research.microsoft.com/pubs/70307/tr-2006-81.pdf */
-/* http://www.opengl.org/wiki/Alpha_Blending */
-
-/***********
- * Helpers *
- ***********/
-static void _set_visuals(GisOpenGL *opengl)
-{
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
-
- /* Camera 1 */
- double lat, lon, elev, rx, ry, rz;
- gis_viewer_get_location(GIS_VIEWER(opengl), &lat, &lon, &elev);
- gis_viewer_get_rotation(GIS_VIEWER(opengl), &rx, &ry, &rz);
- glRotatef(rx, 1, 0, 0);
- glRotatef(rz, 0, 0, 1);
-
- /* Lighting */
-#ifdef ROAM_DEBUG
- float light_ambient[] = {0.7f, 0.7f, 0.7f, 1.0f};
- float light_diffuse[] = {2.0f, 2.0f, 2.0f, 1.0f};
-#else
- float light_ambient[] = {0.2f, 0.2f, 0.2f, 1.0f};
- float light_diffuse[] = {5.0f, 5.0f, 5.0f, 1.0f};
-#endif
- float light_position[] = {-13*EARTH_R, 1*EARTH_R, 3*EARTH_R, 1.0f};
- glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
- glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
- glLightfv(GL_LIGHT0, GL_POSITION, light_position);
- glEnable(GL_LIGHT0);
- glEnable(GL_LIGHTING);
-
- float material_ambient[] = {0.2, 0.2, 0.2, 1.0};
- float material_diffuse[] = {0.8, 0.8, 0.8, 1.0};
- float material_specular[] = {0.1, 0.1, 0.1, 1.0};
- float material_emission[] = {0.0, 0.0, 0.0, 1.0};
- glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, material_ambient);
- glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, material_diffuse);
- glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, material_specular);
- glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, material_emission);
- glDisable(GL_TEXTURE_2D);
- glDisable(GL_COLOR_MATERIAL);
-
- /* Camera 2 */
- glTranslatef(0, 0, -elev2rad(elev));
- glRotatef(lat, 1, 0, 0);
- glRotatef(-lon, 0, 1, 0);
-
- glDisable(GL_ALPHA_TEST);
-
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- glEnable(GL_BLEND);
-
-#ifndef ROAM_DEBUG
- glCullFace(GL_BACK);
- glEnable(GL_CULL_FACE);
-
- glClearDepth(1.0);
- glDepthFunc(GL_LEQUAL);
- glEnable(GL_DEPTH_TEST);
-#endif
-
- glEnable(GL_LINE_SMOOTH);
-
- glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
- //glShadeModel(GL_FLAT);
-
- g_mutex_lock(opengl->sphere_lock);
- roam_sphere_update_view(opengl->sphere);
- g_mutex_unlock(opengl->sphere_lock);
-}
-
-
-/*************
- * Callbacks *
- *************/
-/* The unsorted/sroted GLists are blank head nodes,
- * This way us we can remove objects from the level just by fixing up links
- * I.e. we don't need to do a lookup to remove an object if we have its GList */
-struct RenderLevel {
- GList unsorted;
- GList sorted;
-};
-
-static gboolean on_configure(GisOpenGL *opengl, GdkEventConfigure *event, gpointer _)
-{
- g_debug("GisOpenGL: on_configure");
-
- double width = GTK_WIDGET(opengl)->allocation.width;
- double height = GTK_WIDGET(opengl)->allocation.height;
-
- /* Setup OpenGL Window */
- glViewport(0, 0, width, height);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- double ang = atan(height/FOV_DIST);
- gluPerspective(rad2deg(ang)*2, width/height, 1000, 10*EARTH_R);
-
-#ifndef ROAM_DEBUG
- g_mutex_lock(opengl->sphere_lock);
- roam_sphere_update_errors(opengl->sphere);
- g_mutex_unlock(opengl->sphere_lock);
-#endif
-
- return FALSE;
-}
-
-static gboolean _draw_level(gpointer key, gpointer value, gpointer user_data)
-{
- g_debug("GisOpenGL: _draw_level - level=%-4d", (int)key);
- GisOpenGL *opengl = user_data;
- struct RenderLevel *level = value;
- int nsorted = 0, nunsorted = 0;
- GList *cur = NULL;
-
- /* Draw opaque objects without sorting */
- glDepthMask(TRUE);
- glClear(GL_DEPTH_BUFFER_BIT);
- for (cur = level->unsorted.next; cur; cur = cur->next, nunsorted++)
- gis_object_draw( GIS_OBJECT(cur->data), opengl);
-
- /* Freeze depth buffer and draw transparent objects sorted */
- /* TODO: sorting */
- //glDepthMask(FALSE);
- glAlphaFunc(GL_GREATER, 0.1);
- for (cur = level->sorted.next; cur; cur = cur->next, nsorted++)
- gis_object_draw(GIS_OBJECT(cur->data), opengl);
-
- /* TODO: Prune empty levels */
-
- g_debug("GisOpenGL: _draw_level - drew %d,%d objects",
- nunsorted, nsorted);
- return FALSE;
-}
-
-static gboolean on_expose(GisOpenGL *opengl, GdkEventExpose *event, gpointer _)
-{
- g_debug("GisOpenGL: on_expose - begin");
-
- glClear(GL_COLOR_BUFFER_BIT);
-
- _set_visuals(opengl);
-#ifdef ROAM_DEBUG
- glColor4f(1.0, 1.0, 1.0, 1.0);
- glLineWidth(2);
- glDisable(GL_TEXTURE_2D);
- glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
- roam_sphere_draw(opengl->sphere);
- (void)_draw_level;
- //roam_sphere_draw_normals(opengl->sphere);
-#else
- g_mutex_lock(opengl->objects_lock);
- g_tree_foreach(opengl->objects, _draw_level, opengl);
- if (opengl->wireframe) {
- glClear(GL_DEPTH_BUFFER_BIT);
- glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
- roam_sphere_draw(opengl->sphere);
- }
- g_mutex_unlock(opengl->objects_lock);
-#endif
-
- GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(opengl));
- gdk_gl_drawable_swap_buffers(gldrawable);
-
- g_debug("GisOpenGL: on_expose - end\n");
- return FALSE;
-}
-
-static gboolean on_key_press(GisOpenGL *opengl, GdkEventKey *event, gpointer _)
-{
- g_debug("GisOpenGL: on_key_press - key=%x, state=%x, plus=%x",
- event->keyval, event->state, GDK_plus);
-
- guint kv = event->keyval;
- /* Testing */
- if (kv == GDK_w) {
- opengl->wireframe = !opengl->wireframe;
- gtk_widget_queue_draw(GTK_WIDGET(opengl));
- }
-#ifdef ROAM_DEBUG
- else if (kv == GDK_n) roam_sphere_split_one(opengl->sphere);
- else if (kv == GDK_p) roam_sphere_merge_one(opengl->sphere);
- else if (kv == GDK_r) roam_sphere_split_merge(opengl->sphere);
- else if (kv == GDK_u) roam_sphere_update_errors(opengl->sphere);
- gtk_widget_queue_draw(GTK_WIDGET(opengl));
-#endif
- return FALSE;
-}
-
-static gboolean _update_errors_cb(gpointer _opengl)
-{
- GisOpenGL *opengl = _opengl;
- g_mutex_lock(opengl->sphere_lock);
- roam_sphere_update_errors(opengl->sphere);
- g_mutex_unlock(opengl->sphere_lock);
- opengl->ue_source = 0;
- return FALSE;
-}
-static void on_view_changed(GisOpenGL *opengl,
- gdouble _1, gdouble _2, gdouble _3)
-{
- g_debug("GisOpenGL: on_view_changed");
- _set_visuals(opengl);
-#ifndef ROAM_DEBUG
- if (!opengl->ue_source)
- opengl->ue_source = g_idle_add_full(G_PRIORITY_HIGH_IDLE+30,
- _update_errors_cb, opengl, NULL);
- //roam_sphere_update_errors(opengl->sphere);
-#else
- (void)_update_errors_cb;
-#endif
-}
-
-static gboolean on_idle(GisOpenGL *opengl)
-{
- //g_debug("GisOpenGL: on_idle");
- g_mutex_lock(opengl->sphere_lock);
- if (roam_sphere_split_merge(opengl->sphere))
- gtk_widget_queue_draw(GTK_WIDGET(opengl));
- g_mutex_unlock(opengl->sphere_lock);
- return TRUE;
-}
-
-static void on_realize(GisOpenGL *opengl, gpointer _)
-{
- g_debug("GisOpenGL: on_realize");
-
- /* Start OpenGL */
- GdkGLContext *glcontext = gtk_widget_get_gl_context(GTK_WIDGET(opengl));
- GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(opengl));
- if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
- g_assert_not_reached();
-
- /* Connect signals and idle functions now that opengl is fully initialized */
- gtk_widget_add_events(GTK_WIDGET(opengl), GDK_KEY_PRESS_MASK);
- g_signal_connect(opengl, "configure-event", G_CALLBACK(on_configure), NULL);
- g_signal_connect(opengl, "expose-event", G_CALLBACK(on_expose), NULL);
-
- g_signal_connect(opengl, "key-press-event", G_CALLBACK(on_key_press), NULL);
-
- g_signal_connect(opengl, "location-changed", G_CALLBACK(on_view_changed), NULL);
- g_signal_connect(opengl, "rotation-changed", G_CALLBACK(on_view_changed), NULL);
-
-#ifndef ROAM_DEBUG
- opengl->sm_source[0] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+30, 33, (GSourceFunc)on_idle, opengl, NULL);
- opengl->sm_source[1] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+10, 500, (GSourceFunc)on_idle, opengl, NULL);
-#else
- (void)on_idle;
- (void)_update_errors_cb;
-#endif
-
- /* Re-queue resize incase configure was triggered before realize */
- gtk_widget_queue_resize(GTK_WIDGET(opengl));
-}
-
-/*********************
- * GisViewer methods *
- *********************/
-/**
- * gis_opengl_new:
- * @plugins: the plugins store to use
- * @prefs: the preferences object to use
- *
- * Create a new OpenGL renderer.
- *
- * Returns: the new #GisOpenGL
- */
-GisViewer *gis_opengl_new(GisPlugins *plugins, GisPrefs *prefs)
-{
- g_debug("GisOpenGL: new");
- GisViewer *opengl = g_object_new(GIS_TYPE_OPENGL, NULL);
- gis_viewer_setup(opengl, plugins, prefs);
- return opengl;
-}
-
-static void gis_opengl_center_position(GisViewer *_opengl, gdouble lat, gdouble lon, gdouble elev)
-{
- glRotatef(lon, 0, 1, 0);
- glRotatef(-lat, 1, 0, 0);
- glTranslatef(0, 0, elev2rad(elev));
-}
-
-static void gis_opengl_project(GisViewer *_opengl,
- gdouble lat, gdouble lon, gdouble elev,
- gdouble *px, gdouble *py, gdouble *pz)
-{
- GisOpenGL *opengl = GIS_OPENGL(_opengl);
- gdouble x, y, z;
- lle2xyz(lat, lon, elev, &x, &y, &z);
- gluProject(x, y, z,
- opengl->sphere->view->model,
- opengl->sphere->view->proj,
- opengl->sphere->view->view,
- px, py, pz);
-}
-
-static void gis_opengl_set_height_func(GisViewer *_opengl, GisBounds *bounds,
- RoamHeightFunc height_func, gpointer user_data, gboolean update)
-{
- GisOpenGL *opengl = GIS_OPENGL(_opengl);
- /* TODO: get points? */
- g_mutex_lock(opengl->sphere_lock);
- GList *triangles = roam_sphere_get_intersect(opengl->sphere, TRUE,
- bounds->n, bounds->s, bounds->e, bounds->w);
- for (GList *cur = triangles; cur; cur = cur->next) {
- RoamTriangle *tri = cur->data;
- RoamPoint *points[] = {tri->p.l, tri->p.m, tri->p.r, tri->split};
- for (int i = 0; i < G_N_ELEMENTS(points); i++) {
- if (bounds->n >= points[i]->lat && points[i]->lat >= bounds->s &&
- bounds->e >= points[i]->lon && points[i]->lon >= bounds->w) {
- points[i]->height_func = height_func;
- points[i]->height_data = user_data;
- roam_point_update_height(points[i]);
- }
- }
- }
- g_list_free(triangles);
- g_mutex_unlock(opengl->sphere_lock);
-}
-
-static void _gis_opengl_clear_height_func_rec(RoamTriangle *root)
-{
- if (!root)
- return;
- RoamPoint *points[] = {root->p.l, root->p.m, root->p.r, root->split};
- for (int i = 0; i < G_N_ELEMENTS(points); i++) {
- points[i]->height_func = NULL;
- points[i]->height_data = NULL;
- roam_point_update_height(points[i]);
- }
- _gis_opengl_clear_height_func_rec(root->kids[0]);
- _gis_opengl_clear_height_func_rec(root->kids[1]);
-}
-
-static void gis_opengl_clear_height_func(GisViewer *_opengl)
-{
- GisOpenGL *opengl = GIS_OPENGL(_opengl);
- for (int i = 0; i < G_N_ELEMENTS(opengl->sphere->roots); i++)
- _gis_opengl_clear_height_func_rec(opengl->sphere->roots[i]);
-}
-
-static gpointer gis_opengl_add(GisViewer *_opengl, GisObject *object,
- gint key, gboolean sort)
-{
- g_assert(GIS_IS_OPENGL(_opengl));
- GisOpenGL *opengl = GIS_OPENGL(_opengl);
- g_mutex_lock(opengl->objects_lock);
- struct RenderLevel *level = g_tree_lookup(opengl->objects, (gpointer)key);
- if (!level) {
- level = g_new0(struct RenderLevel, 1);
- g_tree_insert(opengl->objects, (gpointer)key, level);
- }
- GList *list = sort ? &level->sorted : &level->unsorted;
- /* Put the link in the list */
- GList *link = g_new0(GList, 1);
- link->data = object;
- link->prev = list;
- link->next = list->next;
- if (list->next)
- list->next->prev = link;
- list->next = link;
- g_mutex_unlock(opengl->objects_lock);
- return link;
-}
-
-static GisObject *gis_opengl_remove(GisViewer *_opengl, gpointer _link)
-{
- g_assert(GIS_IS_OPENGL(_opengl));
- GisOpenGL *opengl = GIS_OPENGL(_opengl);
- g_mutex_lock(opengl->objects_lock);
- GList *link = _link;
- GisObject *object = link->data;
- /* Just unlink and free it, link->prev is assured */
- link->prev->next = link->next;
- if (link->next)
- link->next->prev = link->prev;
- g_free(link);
- g_object_unref(object);
- g_mutex_unlock(opengl->objects_lock);
- return object;
-}
-
-/****************
- * GObject code *
- ****************/
-static int _objects_cmp(gconstpointer _a, gconstpointer _b, gpointer _)
-{
- gint a = (int)_a, b = (int)_b;
- return a < b ? -1 :
- a > b ? 1 : 0;
-}
-static void _objects_free(gpointer value)
-{
- struct RenderLevel *level = value;
- if (level->sorted.next)
- g_list_free(level->sorted.next);
- if (level->unsorted.next)
- g_list_free(level->unsorted.next);
- g_free(level);
-}
-
-G_DEFINE_TYPE(GisOpenGL, gis_opengl, GIS_TYPE_VIEWER);
-static void gis_opengl_init(GisOpenGL *opengl)
-{
- g_debug("GisOpenGL: init");
- opengl->objects = g_tree_new_full(_objects_cmp, NULL, NULL, _objects_free);
- opengl->objects_lock = g_mutex_new();
- opengl->sphere = roam_sphere_new(opengl);
- opengl->sphere_lock = g_mutex_new();
-
- /* Set OpenGL before "realize" */
- GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
- GDK_GL_MODE_RGBA | GDK_GL_MODE_DEPTH |
- GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
- if (!glconfig)
- g_error("Failed to create glconfig");
- if (!gtk_widget_set_gl_capability(GTK_WIDGET(opengl),
- glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
- g_error("GL lacks required capabilities");
- g_object_unref(glconfig);
-
- /* Finish OpenGL init after it's realized */
- g_signal_connect(opengl, "realize", G_CALLBACK(on_realize), NULL);
-}
-static void gis_opengl_dispose(GObject *_opengl)
-{
- g_debug("GisOpenGL: dispose");
- GisOpenGL *opengl = GIS_OPENGL(_opengl);
- if (opengl->sm_source[0]) {
- g_source_remove(opengl->sm_source[0]);
- opengl->sm_source[0] = 0;
- }
- if (opengl->sm_source[1]) {
- g_source_remove(opengl->sm_source[1]);
- opengl->sm_source[1] = 0;
- }
- if (opengl->ue_source) {
- g_source_remove(opengl->ue_source);
- opengl->ue_source = 0;
- }
- G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_opengl);
-}
-static void gis_opengl_finalize(GObject *_opengl)
-{
- g_debug("GisOpenGL: finalize");
- GisOpenGL *opengl = GIS_OPENGL(_opengl);
- roam_sphere_free(opengl->sphere);
- g_tree_destroy(opengl->objects);
- g_mutex_free(opengl->objects_lock);
- g_mutex_free(opengl->sphere_lock);
- G_OBJECT_CLASS(gis_opengl_parent_class)->finalize(_opengl);
-}
-static void gis_opengl_class_init(GisOpenGLClass *klass)
-{
- g_debug("GisOpenGL: class_init");
- GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
- gobject_class->finalize = gis_opengl_finalize;
- gobject_class->dispose = gis_opengl_dispose;
-
- GisViewerClass *viewer_class = GIS_VIEWER_CLASS(klass);
- viewer_class->center_position = gis_opengl_center_position;
- viewer_class->project = gis_opengl_project;
- viewer_class->clear_height_func = gis_opengl_clear_height_func;
- viewer_class->set_height_func = gis_opengl_set_height_func;
- viewer_class->add = gis_opengl_add;
- viewer_class->remove = gis_opengl_remove;
-}
projects / grits / blobdiff