Hello First of all, sorry for my English.
I want to learn developing OpenGL applications, so I try gtkglext. The examples are great! :) But I would like to follow the redbook from OpenGL to learn it from scratch. So, I try the example1-1 [1] (A white square into a black screen), but i didnt get it working. The code (based on simple.c) mentioned is commented and posted below. Thanks in advance P.S. If this is off topic, please tell me and sorry. [1] http://www.rush3d.com/reference/opengl-redbook-1.1/chapter01.html ---------------- CODE: example1_1.c -------------------- /* * example1_1.c on redBook (The White square) * * Problem: The app only display a black window * * Using GTK+ through libgtkglext * * Functions: * main() create the widgets and connect the signals to their callback * realize() is called only once on startup * expose_event() is called when the drawingarea should be repainted. */ #include <stdlib.h> #include <gtk/gtk.h> #include <gtk/gtkgl.h> #include <GL/gl.h> #include <GL/glu.h> static void realize (GtkWidget *widget, gpointer data) { GdkGLContext *glcontext = gtk_widget_get_gl_context (widget); GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable (widget); /*** OpenGL BEGIN ***/ if (!gdk_gl_drawable_gl_begin (gldrawable, glcontext)) return; /*** Begin code from example-1.1 ***/ glClearColor (0.0, 0.0, 0.0, 0.0); glClear (GL_COLOR_BUFFER_BIT); glColor3f (1.0, 1.0, 1.0); glOrtho (-1.0, 1.0, -1.0, 1.0, -1.0, 1.0); glBegin(GL_POLYGON); glVertex2f(-0.5, -0.5); glVertex2f(-0.5, 0.5); glVertex2f(0.5, 0.5); glVertex2f(0.5, -0.5); glEnd(); glFlush(); /*** End code from example-1.1 ***/ glViewport (0, 0, widget->allocation.width, widget->allocation.height); gdk_gl_drawable_gl_end (gldrawable); /*** OpenGL END ***/ } static gboolean expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer data) { GdkGLContext *glcontext = gtk_widget_get_gl_context (widget); GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable (widget); /*** OpenGL BEGIN ***/ if (!gdk_gl_drawable_gl_begin (gldrawable, glcontext)) return FALSE; if (gdk_gl_drawable_is_double_buffered (gldrawable)) gdk_gl_drawable_swap_buffers (gldrawable); else glFlush (); gdk_gl_drawable_gl_end (gldrawable); /*** OpenGL END ***/ return TRUE; } int main (int argc, char *argv[]) { GdkGLConfig *glconfig; gint major, minor; GtkWidget *window; GtkWidget *vbox; GtkWidget *drawing_area; GtkWidget *button; /* * Init GTK. */ gtk_init (&argc, &argv); /* * Init GtkGLExt. */ gtk_gl_init (&argc, &argv); /* * Query OpenGL extension version. */ gdk_gl_query_version (&major, &minor); g_print ("\nOpenGL extension version - %d.%d\n", major, minor); /* * Configure OpenGL-capable visual. */ /* Try double-buffered visual */ glconfig = gdk_gl_config_new_by_mode (GDK_GL_MODE_RGB | GDK_GL_MODE_DEPTH | GDK_GL_MODE_DOUBLE); if (glconfig == NULL) { g_print ("*** Cannot find the double-buffered visual.\n"); g_print ("*** Trying single-buffered visual.\n"); /* Try single-buffered visual */ glconfig = gdk_gl_config_new_by_mode (GDK_GL_MODE_RGB | GDK_GL_MODE_DEPTH); if (glconfig == NULL) { g_print ("*** No appropriate OpenGL-capable visual found.\n"); exit (1); } } /* * Top-level window. */ window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "simple"); /* Get automatically redrawn if any of their children changed allocation. */ gtk_container_set_reallocate_redraws (GTK_CONTAINER (window), TRUE); g_signal_connect (G_OBJECT (window), "delete_event", G_CALLBACK (gtk_main_quit), NULL); /* * VBox. */ vbox = gtk_vbox_new (FALSE, 0); gtk_container_add (GTK_CONTAINER (window), vbox); gtk_widget_show (vbox); /* * Drawing area for drawing OpenGL scene. */ drawing_area = gtk_drawing_area_new (); gtk_widget_set_size_request (drawing_area, 200, 200); /* Set OpenGL-capability to the widget. */ gtk_widget_set_gl_capability (drawing_area, glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE); g_signal_connect_after (G_OBJECT (drawing_area), "realize", G_CALLBACK (realize), NULL); g_signal_connect (G_OBJECT (drawing_area), "expose_event", G_CALLBACK (expose_event), NULL); gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0); gtk_widget_show (drawing_area); /* * Simple quit button. */ button = gtk_button_new_with_label ("Quit"); g_signal_connect (G_OBJECT (button), "clicked", G_CALLBACK (gtk_main_quit), NULL); gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0); gtk_widget_show (button); /* * Show window. */ gtk_widget_show (window); /* * Main loop. */ gtk_main (); return 0; } _______________________________________________ gtkglext-list mailing list [email protected] http://mail.gnome.org/mailman/listinfo/gtkglext-list
