--- /dev/null
+#include <gtk/gtk.h>
+#include <gtk/gtkgl.h>
+#include <gdk/gdkkeysyms.h>
+#include <GL/gl.h>
+#include <GL/glu.h>
+
+guint tex, texl, texr;
+
+gboolean on_key_press(GtkWidget *widget, GdkEventKey *event, gpointer _)
+{
+ if (event->keyval == GDK_q)
+ gtk_main_quit();
+ return FALSE;
+}
+
+gboolean on_expose(GtkWidget *drawing, GdkEventExpose *event, gpointer _)
+{
+ //glClearColor(0.5, 0.5, 1.0, 1.0);
+ glClearColor(0.0, 0.0, 0.0, 0.0);
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+ glEnable(GL_BLEND);
+
+ /* Blend, but broken sorting */
+ //glEnable(GL_DEPTH_TEST);
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+ /* No sorting, just add */
+ //glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+ //glBlendFunc(GL_ONE, GL_ONE);
+
+ /* Lighting */
+ float light_ambient[] = {0.1f, 0.1f, 0.0f, 1.0f};
+ float light_diffuse[] = {0.9f, 0.9f, 0.9f, 1.0f};
+ float light_position[] = {-30.0f, 50.0f, 40.0f, 1.0f};
+ glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
+ glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
+ glLightfv(GL_LIGHT0, GL_POSITION, light_position);
+ glEnable(GL_COLOR_MATERIAL);
+ glEnable(GL_LIGHTING);
+ glEnable(GL_LIGHT0);
+
+ /* Set up projection */
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glOrtho(1,-1, -1,1, -10,10);
+
+ /* Draw teapots */
+ glMatrixMode(GL_MODELVIEW);
+
+ glLoadIdentity();
+ glTranslatef(-0.2, -0.2, -2);
+ glRotatef(30, 1, -1, -0.2);
+ glColor4f(0.6, 0.6, 0.4, 0.5);
+ gdk_gl_draw_teapot(TRUE, 0.5);
+
+ glLoadIdentity();
+ glTranslatef(0.2, 0.2, -2);
+ glRotatef(30, 1, -1, -0.2);
+ glColor4f(0.6, 0.6, 0.4, 0.5);
+ gdk_gl_draw_teapot(TRUE, 0.5);
+
+ /* Flush */
+ GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
+ if (gdk_gl_drawable_is_double_buffered(gldrawable))
+ gdk_gl_drawable_swap_buffers(gldrawable);
+ else
+ glFlush();
+ return FALSE;
+}
+
+gboolean on_configure(GtkWidget *drawing, GdkEventConfigure *event, gpointer _)
+{
+ glViewport(0, 0,
+ drawing->allocation.width,
+ drawing->allocation.height);
+ return FALSE;
+}
+
+int main(int argc, char **argv)
+{
+ gtk_init(&argc, &argv);
+
+ GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+ GtkWidget *drawing = gtk_drawing_area_new();
+ GdkGLConfig *glconfig = gdk_gl_config_new_by_mode((GdkGLConfigMode)(
+ GDK_GL_MODE_RGBA | GDK_GL_MODE_DEPTH |
+ GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA));
+ g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
+ g_signal_connect(window, "key-press-event", G_CALLBACK(on_key_press), NULL);
+ g_signal_connect(drawing, "expose-event", G_CALLBACK(on_expose), NULL);
+ g_signal_connect(drawing, "configure-event", G_CALLBACK(on_configure), NULL);
+ gtk_widget_set_gl_capability(drawing, glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE);
+ gtk_container_add(GTK_CONTAINER(window), drawing);
+ gtk_widget_show_all(window);
+
+ /* OpenGL setup */
+ GdkGLContext *glcontext = gtk_widget_get_gl_context(GTK_WIDGET(drawing));
+ GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(drawing));
+ gdk_gl_drawable_gl_begin(gldrawable, glcontext);
+
+ gtk_main();
+
+ gdk_gl_drawable_gl_end(gldrawable);
+}