8 static gboolean expose_start(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
10 g_message("opengl:expose_start");
11 GdkGLContext *glcontext = gtk_widget_get_gl_context(da);
12 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(da);
14 if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext)) {
15 g_assert_not_reached();
19 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
22 /* Plugins run stuff here */
23 static gboolean expose_end(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
25 g_message("opengl:expose_end");
27 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(da);
29 if (gdk_gl_drawable_is_double_buffered(gldrawable))
30 gdk_gl_drawable_swap_buffers(gldrawable);
34 gdk_gl_drawable_gl_end(gldrawable);
38 static gboolean configure_start(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
40 GdkGLContext *glcontext = gtk_widget_get_gl_context(da);
41 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(da);
43 if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
44 g_assert_not_reached();
47 double width = da->allocation.width;
48 double height = da->allocation.height;
49 double dist = 500*1000; // 500 km
50 glViewport(0, 0, width, height);
53 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
55 glMatrixMode(GL_PROJECTION);
57 double rad = atan(height/2*1000.0/dist); // 1px = 1000 meters
58 double deg = (rad*180)/M_PI;
59 gluPerspective(deg*2, width/height, 0.1f, 10000000.0f);
61 glMatrixMode(GL_MODELVIEW);
63 glTranslatef(0.0, 0.0, -dist);
64 glRotatef(-45, 1, 0, 0);
68 static gboolean configure_end(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
70 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(da);
71 gdk_gl_drawable_gl_end(gldrawable);
75 gboolean opengl_init(GtkDrawingArea *drawing, GtkNotebook *config)
77 /* Set up OpenGL Stuff */
78 g_signal_connect (drawing, "configure-event", G_CALLBACK(configure_start), NULL);
79 g_signal_connect_after(drawing, "configure-event", G_CALLBACK(configure_end), NULL);
80 g_signal_connect (drawing, "expose-event", G_CALLBACK(expose_start), NULL);
81 g_signal_connect_after(drawing, "expose-event", G_CALLBACK(expose_end), NULL);