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

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