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\n");
27 GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
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
52 glViewport(0, 0, width, height);
54 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
55 glClearColor(0.8f, 0.8f, 1.0f, 0.0f);
56 glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
60 glDepthFunc(GL_LEQUAL);
61 glEnable(GL_DEPTH_TEST);
64 glMatrixMode(GL_PROJECTION);
66 double rad = atan(height/2*1000.0/dist); // 1px = 1000 meters
67 double deg = (rad*180)/M_PI;
68 gluPerspective(deg*2, width/height, 0.1f, 1000000000.0f);
70 /* Camera position? */
71 glMatrixMode(GL_MODELVIEW);
73 glTranslatef(0.0, 0.0, -dist);
74 //glRotatef(-45, 1, 0, 0);
79 static gboolean configure_end(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
81 GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
82 gdk_gl_drawable_gl_end(gldrawable);
86 gboolean opengl_init(GtkDrawingArea *drawing, GtkNotebook *config)
88 /* Set up OpenGL Stuff */
89 g_signal_connect (drawing, "configure-event", G_CALLBACK(configure_start), NULL);
90 g_signal_connect_after(drawing, "configure-event", G_CALLBACK(configure_end), NULL);
91 g_signal_connect (drawing, "expose-event", G_CALLBACK(expose_start), NULL);
92 g_signal_connect_after(drawing, "expose-event", G_CALLBACK(expose_end), NULL);