1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
#include <stdlib.h>
#include <gtk/gtk.h>
#include <epoxy/gl.h>
static gboolean
render (GtkGLArea *area,
GdkGLContext *context)
{
glClearColor (0, 0, 0, 0);
glClear (GL_COLOR_BUFFER_BIT);
glColor3f (1.0f, 0.85f, 0.35f);
glBegin (GL_TRIANGLES);
{
glVertex3f ( 0.0, 0.6, 0.0);
glVertex3f (-0.2, -0.3, 0.0);
glVertex3f ( 0.2, -0.3, 0.0);
}
glEnd ();
glFlush ();
return TRUE;
}
int
main (int argc, char *argv[])
{
GtkWidget *window, *gl_area, *box, *button;
GdkGLPixelFormat *pixel_format;
gtk_init (&argc, &argv);
/* create a new pixel format; we use this to configure the
* GL context, and to check for features
*/
pixel_format = gdk_gl_pixel_format_new ("double-buffer", TRUE, NULL);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "GtkGLArea - Golden Triangle");
gtk_window_set_default_size (GTK_WINDOW (window), 400, 400);
gtk_container_set_border_width (GTK_CONTAINER (window), 12);
g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
gtk_widget_show (window);
box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
gtk_box_set_spacing (GTK_BOX (box), 6);
gtk_container_add (GTK_CONTAINER (window), box);
gtk_widget_show (box);
gl_area = gtk_gl_area_new (pixel_format);
gtk_widget_set_hexpand (gl_area, TRUE);
gtk_widget_set_vexpand (gl_area, TRUE);
gtk_container_add (GTK_CONTAINER (box), gl_area);
gtk_widget_show (gl_area);
g_object_unref (pixel_format);
g_signal_connect (gl_area, "render", G_CALLBACK (render), NULL);
button = gtk_button_new_with_label ("Quit");
gtk_widget_set_hexpand (button, TRUE);
gtk_container_add (GTK_CONTAINER (box), button);
g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
gtk_widget_show (button);
gtk_main ();
return EXIT_SUCCESS;
}
|
