Add z-index to tiles

[grits] / src / gis-opengl.c

diff --git a/src/gis-opengl.c b/src/gis-opengl.c
index 8f03e8df4cc9c95f568877dfc2c1d7d7ce7ad625..57cfb471e901894d3b510c9f0e3b99aabbf50b10 100644 (file)
--- a/src/gis-opengl.c
+++ b/src/gis-opengl.c
@@ -115,7 +115,9 @@ static void _set_visuals(GisOpenGL *opengl)
        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);
 }
 
 
@@ -176,7 +178,9 @@ static void _draw_tile(GisOpenGL *opengl, GisTile *tile, GList *triangles)
                if (lat[2] == 90 || lat[2] == -90) xy[2][0] = 0.5;
 
                glEnable(GL_TEXTURE_2D);
+               glEnable(GL_POLYGON_OFFSET_FILL);
                glBindTexture(GL_TEXTURE_2D, *(guint*)tile->data);
+               glPolygonOffset(0, -tile->zindex);
                glBegin(GL_TRIANGLES);
                glNormal3dv(tri->p.r->norm); glTexCoord2dv(xy[0]); glVertex3dv((double*)tri->p.r);
                glNormal3dv(tri->p.m->norm); glTexCoord2dv(xy[1]); glVertex3dv((double*)tri->p.m);
@@ -233,6 +237,7 @@ static void _draw_marker(GisOpenGL *opengl, GisMarker *marker)
        gis_viewer_project(GIS_VIEWER(opengl),
                        point->lat, point->lon, point->elev,
                        &px, &py, &pz);
+
        gint win_width  = GTK_WIDGET(opengl)->allocation.width;
        gint win_height = GTK_WIDGET(opengl)->allocation.height;
        py = win_height - py;
@@ -275,14 +280,23 @@ static void _draw_object(GisOpenGL *opengl, GisObject *object)
        //g_debug("GisOpenGL: draw_object");
        /* Skip out of range objects */
        if (object->lod > 0) {
+               /* LOD test */
                gdouble eye[3], obj[3];
                gis_viewer_get_location(GIS_VIEWER(opengl), &eye[0], &eye[1], &eye[2]);
+               gdouble elev = eye[2];
                lle2xyz(eye[0], eye[1], eye[2], &eye[0], &eye[1], &eye[2]);
                lle2xyz(object->center.lat, object->center.lon, object->center.elev,
                        &obj[0], &obj[1], &obj[2]);
                gdouble dist = distd(obj, eye);
                if (object->lod < dist)
                        return;
+
+               /* Horizon testing */
+               gdouble c = EARTH_R+elev;
+               gdouble a = EARTH_R;
+               gdouble horizon = sqrt(c*c - a*a);
+               if (dist > horizon)
+                       return;
        }
 
        /* Draw */
@@ -296,7 +310,9 @@ static void _draw_object(GisOpenGL *opengl, GisObject *object)
        } else if (GIS_IS_TILE(object)) {
                glEnable(GL_DEPTH_TEST);
                glDepthFunc(GL_LESS);
+               g_mutex_lock(opengl->sphere_lock);
                _draw_tiles(opengl, GIS_TILE(object));
+               g_mutex_unlock(opengl->sphere_lock);
        }
        glPopAttrib();
        glMatrixMode(GL_PROJECTION); glPopMatrix();
@@ -468,7 +484,9 @@ static gboolean on_key_press(GisOpenGL *opengl, GdkEventKey *event, gpointer _)
 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;
 }