static void compass_expose(GritsCallback *compass, GritsOpenGL *opengl, gpointer _env)
{
GritsPluginEnv *env = GRITS_PLUGIN_ENV(_env);
g_debug("GritsPluginEnv: compass_expose");
gdouble x, y, z;
grits_viewer_get_rotation(env->viewer, &x, &y, &z);
/* Setup projection */
GtkAllocation alloc;
gtk_widget_get_allocation(GTK_WIDGET(opengl), &alloc);
float scale = CLAMP(MIN(alloc.width,alloc.height)/2.0 * 0.1, 40, 100);
float offset = scale + 20;
glTranslatef(alloc.width - offset, offset, 0);
/* Setup state */
glClear(GL_DEPTH_BUFFER_BIT);
glEnable(GL_COLOR_MATERIAL);
glEnable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
glEnable(GL_POLYGON_SMOOTH);
glEnable(GL_LINE_SMOOTH);
/* Draw compass */
x = CLAMP(x, -66, 66);;
glRotatef(x, 1, 0, 0);
glRotatef(-z, 0, 0, 1);
compass_draw_compass(scale);
}
static gboolean on_motion_notify(GritsViewer *viewer, GdkEventMotion *event, gpointer _)
{
gdouble x = viewer->drag_x - event->x;
gdouble y = viewer->drag_y - event->y;
gdouble lat, lon, elev, scale, rx, ry, rz;
grits_viewer_get_location(GRITS_VIEWER(viewer), &lat, &lon, &elev);
grits_viewer_get_rotation(GRITS_VIEWER(viewer), &rx, &ry, &rz);
scale = (elev/EARTH_R/15) * (sin(deg2rad(ABS(rx)))*4+1);
switch (viewer->drag_mode) {
case GRITS_DRAG_PAN: grits_viewer_pan(viewer, -y*scale, x*scale, 0); break;
case GRITS_DRAG_ZOOM: grits_viewer_zoom(viewer, pow(2, -y/500)); break;
case GRITS_DRAG_TILT: grits_viewer_rotate(viewer, y/10, 0, x/10); break;
}
viewer->drag_x = event->x;
viewer->drag_y = event->y;
return FALSE;
}
/***********
* Helpers *
***********/
static void _set_visuals(GritsOpenGL *opengl)
{
double lat, lon, elev, rx, ry, rz;
grits_viewer_get_location(GRITS_VIEWER(opengl), &lat, &lon, &elev);
grits_viewer_get_rotation(GRITS_VIEWER(opengl), &rx, &ry, &rz);
/* Set projection and clipping planes */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
double width = GTK_WIDGET(opengl)->allocation.width;
double height = GTK_WIDGET(opengl)->allocation.height;
double ang = atan(height/FOV_DIST);
double atmos = 100000;
double near = MAX(elev*0.75 - atmos, 50); // View 100km of atmosphere
double far = elev + 2*EARTH_R + atmos; // on both sides of the earth
grits_viewer_get_location(GRITS_VIEWER(opengl), &lat, &lon, &elev);
glViewport(0, 0, width, height);
gluPerspective(rad2deg(ang)*2, width/height, near, far);
/* Setup camera and lighting */
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
/* Camera 1 */
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[] = {0.8f, 0.8f, 0.8f, 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[] = {1.0, 1.0, 1.0, 1.0};
float material_diffuse[] = {1.0, 1.0, 1.0, 1.0};
float material_specular[] = {0.0, 0.0, 0.0, 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);
}
