Pileus Git - grits/blob - examples/sorting/sort.c

   1 #include <gtk/gtk.h>
   2 #include <gtk/gtkgl.h>
   3 #include <gdk/gdkkeysyms.h>
   4 #include <GL/gl.h>
   5 #include <GL/glu.h>
   6
   7 guint tex, texl, texr;
   8
   9 gboolean on_key_press(GtkWidget *widget, GdkEventKey *event, gpointer _)
  10 {
  11         if (event->keyval == GDK_q)
  12                 gtk_main_quit();
  13         return FALSE;
  14 }
  15
  16 gboolean on_expose(GtkWidget *drawing, GdkEventExpose *event, gpointer _)
  17 {
  18         //glClearColor(0.5, 0.5, 1.0, 1.0);
  19         glClearColor(0.0, 0.0, 0.0, 0.0);
  20         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  21
  22         glEnable(GL_BLEND);
  23
  24         /* Blend, but broken sorting */
  25         //glEnable(GL_DEPTH_TEST);
  26         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  27
  28         /* No sorting, just add */
  29         //glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  30         //glBlendFunc(GL_ONE, GL_ONE);
  31
  32         /* Lighting */
  33         float light_ambient[]  = {0.1f, 0.1f, 0.0f, 1.0f};
  34         float light_diffuse[]  = {0.9f, 0.9f, 0.9f, 1.0f};
  35         float light_position[] = {-30.0f, 50.0f, 40.0f, 1.0f};
  36         glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
  37         glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
  38         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  39         glEnable(GL_COLOR_MATERIAL);
  40         glEnable(GL_LIGHTING);
  41         glEnable(GL_LIGHT0);
  42
  43         /* Set up projection */
  44         glMatrixMode(GL_PROJECTION);
  45         glLoadIdentity();
  46         glOrtho(1,-1, -1,1, -10,10);
  47
  48         /* Draw teapots */
  49         glMatrixMode(GL_MODELVIEW);
  50
  51         glLoadIdentity();
  52         glTranslatef(-0.2, -0.2, -2);
  53         glRotatef(30, 1, -1, -0.2);
  54         glColor4f(0.6, 0.6, 0.4, 0.5);
  55         gdk_gl_draw_teapot(TRUE, 0.5);
  56
  57         glLoadIdentity();
  58         glTranslatef(0.2, 0.2, -2);
  59         glRotatef(30, 1, -1, -0.2);
  60         glColor4f(0.6, 0.6, 0.4, 0.5);
  61         gdk_gl_draw_teapot(TRUE, 0.5);
  62
  63         /* Flush */
  64         GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
  65         if (gdk_gl_drawable_is_double_buffered(gldrawable))
  66                 gdk_gl_drawable_swap_buffers(gldrawable);
  67         else
  68                 glFlush();
  69         return FALSE;
  70 }
  71
  72 gboolean on_configure(GtkWidget *drawing, GdkEventConfigure *event, gpointer _)
  73 {
  74         glViewport(0, 0,
  75                 drawing->allocation.width,
  76                 drawing->allocation.height);
  77         return FALSE;
  78 }
  79
  80 int main(int argc, char **argv)
  81 {
  82         gtk_init(&argc, &argv);
  83
  84         GtkWidget   *window   = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  85         GtkWidget   *drawing  = gtk_drawing_area_new();
  86         GdkGLConfig *glconfig = gdk_gl_config_new_by_mode((GdkGLConfigMode)(
  87                         GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
  88                         GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA));
  89         g_signal_connect(window,  "destroy",         G_CALLBACK(gtk_main_quit), NULL);
  90         g_signal_connect(window,  "key-press-event", G_CALLBACK(on_key_press),  NULL);
  91         g_signal_connect(drawing, "expose-event",    G_CALLBACK(on_expose),     NULL);
  92         g_signal_connect(drawing, "configure-event", G_CALLBACK(on_configure),  NULL);
  93         gtk_widget_set_gl_capability(drawing, glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE);
  94         gtk_container_add(GTK_CONTAINER(window), drawing);
  95         gtk_widget_show_all(window);
  96
  97         /* OpenGL setup */
  98         GdkGLContext  *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(drawing));
  99         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(drawing));
 100         gdk_gl_drawable_gl_begin(gldrawable, glcontext);
 101
 102         gtk_main();
 103
 104         gdk_gl_drawable_gl_end(gldrawable);
 105 }