Pileus Git - grits/blob - src/example.c

   1 #include <config.h>
   2 #include <gtk/gtk.h>
   3 #include <gtk/gtkgl.h>
   4 #include <gdk/gdkkeysyms.h>
   5 #include <GL/gl.h>
   6 #include <math.h>
   7
   8 static GtkWidget *rotate_button;
   9
  10 static float ang = 30.;
  11
  12 static gboolean expose(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
  13 {
  14         glPushMatrix();
  15         glLoadIdentity();
  16         glTranslatef(0.5, -0.5, 0);
  17
  18         float light_ambient[]  = {0.1f, 0.1f, 0.0f};
  19         float light_diffuse[]  = {0.9f, 0.9f, 0.9f};
  20         float light_position[] = {-20.0f, 40.0f, -40.0f, 1.0f};
  21         glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
  22         glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
  23         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  24         glEnable(GL_LIGHT0);
  25         glEnable(GL_LIGHTING);
  26         glEnable(GL_COLOR_MATERIAL);
  27         glEnable(GL_DEPTH_TEST);
  28
  29         glRotatef(ang, 1, 0, 1);
  30         glColor3f(0.9, 0.9, 0.7);
  31         gdk_gl_draw_teapot(TRUE, 0.25);
  32         glColor3f(1.0, 1.0, 1.0);
  33
  34         glDisable(GL_LIGHT0);
  35         glDisable(GL_LIGHTING);
  36         glDisable(GL_COLOR_MATERIAL);
  37         glDisable(GL_DEPTH_TEST);
  38
  39         glPopMatrix();
  40         return FALSE;
  41 }
  42
  43 static gboolean rotate(gpointer user_data)
  44 {
  45         if (!gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(rotate_button)))
  46                 return TRUE;
  47
  48         GtkWidget *da = GTK_WIDGET (user_data);
  49
  50         ang++;
  51
  52         gdk_window_invalidate_rect(da->window, &da->allocation, FALSE);
  53         gdk_window_process_updates(da->window, FALSE);
  54
  55         return TRUE;
  56 }
  57
  58 gboolean example_init(GtkDrawingArea *drawing, GtkNotebook *config)
  59 {
  60         /* Add configuration tab */
  61         GtkWidget *label = gtk_label_new("example");
  62         rotate_button = gtk_toggle_button_new_with_label("Rotate");
  63         gtk_notebook_append_page(GTK_NOTEBOOK(config), rotate_button, label);
  64
  65         /* Set up OpenGL Stuff */
  66         g_signal_connect(drawing, "expose-event", G_CALLBACK(expose), NULL);
  67         g_timeout_add(1000/60, rotate, drawing);
  68         return TRUE;
  69 }