dwss/dwss.cc

/*
 * Copyright (C) 2005 Ray Strode <rstrode@redhat.com>,
 *                    Matthias Clasen <mclasen@redhat.com>,
 *                    Søren Sandmann <sandmann@redhat.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 *
 * Originally written by: Ray Strode <rstrode@redhat.com>
 *
 * Later contributions by: Matthias Clasen <mclasen@redhat.com>
 *                         Søren Sandmann <sandmann@redhat.com>
 */

#include <math.h>
#include <stdlib.h>
#include <sysexits.h>
#include <time.h>
#include <sys/time.h>

#include <glib.h>
#include <glib/gi18n.h>

#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#include <gdk/gdkgl.h>

#include <gtk/gtk.h>
#include <gtk/gtkgl.h>

#include <GL/gl.h>
#include <GL/glu.h>

#include "gs-theme-window.h"

static gchar *geometry = NULL;
static GtkWidget *drawing_area;

static GOptionEntry options[] = {
       {"geometry", 0, 0, G_OPTION_ARG_STRING, &geometry,
             N_("The initial size and position of window"),
             N_("WIDTHxHEIGHT+X+Y")},
       {NULL}
};

static uint64_t start_msec;

static uint32_t getElapsedTime()
{
    struct timeval tv;
    gettimeofday(&tv, NULL);
    uint64_t msec = tv.tv_sec * 1000 + tv.tv_usec / 1000;
    return msec - start_msec;
}

static gboolean
expose (GtkWidget *da, GdkEventExpose *event, gpointer user_data)
{
    GdkGLContext *glcontext = gtk_widget_get_gl_context(da);
    GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(da);

    if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
    {
        g_assert_not_reached();
    }

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();
    glRotatef(getElapsedTime()/1000.0*360.0, 0, 0, 1);
    glBegin(GL_QUADS);
    glColor3f(1, 0.6, 0);
    glNormal3f(0, 0, 1);
    glVertex2f(1, 1);
    glVertex2f(-1, 1);
    glVertex2f(-1, -1);
    glVertex2f(1, 0);
    glEnd();
    glPopMatrix();

    if (gdk_gl_drawable_is_double_buffered(gldrawable))
        gdk_gl_drawable_swap_buffers(gldrawable);
    else
        glFlush();

    gdk_gl_drawable_gl_end(gldrawable);

    return TRUE;
}

static gboolean
configure (GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
{
    GdkGLContext *glcontext = gtk_widget_get_gl_context(da);
    GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(da);

    if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
    {
        g_assert_not_reached();
    }

    glViewport(0, 0, da->allocation.width, da->allocation.height);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(60.0,
            (double)da->allocation.width / (double)da->allocation.height,
            0.001,
            1000.0);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glTranslatef(0, 0, -2);

    glShadeModel(GL_SMOOTH);

    gdk_gl_drawable_gl_end(gldrawable);

    return TRUE;
}

static gboolean
update (void *user_data)
{
    GdkRectangle rect;
    GdkWindow *win = gtk_widget_get_parent_window(drawing_area);
    rect.x = rect.y = 0;
    gdk_window_get_geometry(win, NULL, NULL, &rect.width, &rect.height, NULL);
    gdk_window_invalidate_rect(win, &rect, TRUE);
    return TRUE;
}

int
main (int   argc,
      char *argv[])
{
    GtkWidget *window;
    GdkGLConfig *glconfig;

    GtkStateType state;

    GError *error;

    error = NULL;

    gtk_init_with_args (&argc, &argv,
        _("DornerWorks ScreenSaver"),
        NULL, NULL, &error);
    gtk_gl_init(&argc, &argv);


    if (error != NULL)
    {
        g_printerr (_("%s. See --help for usage information.\n"),
            _(error->message));
        g_error_free (error);
        return EX_SOFTWARE;
    }


    window = gs_theme_window_new ();

    g_signal_connect (G_OBJECT (window), "delete-event",
        G_CALLBACK (gtk_main_quit), NULL);

    drawing_area = gtk_drawing_area_new ();

    glconfig = gdk_gl_config_new_by_mode( (GdkGLConfigMode)
            ( GDK_GL_MODE_RGB |
              GDK_GL_MODE_DEPTH |
              GDK_GL_MODE_DOUBLE ) );

    if (!glconfig)
    {
        g_assert_not_reached();
    }
    if (!gtk_widget_set_gl_capability(drawing_area, glconfig, NULL, TRUE,
                GDK_GL_RGBA_TYPE))
    {
        g_assert_not_reached();
    }

    g_signal_connect(drawing_area, "configure-event",
            G_CALLBACK(configure), NULL);
    g_signal_connect(drawing_area, "expose-event",
            G_CALLBACK(expose), NULL);

    gtk_widget_show (drawing_area);
    gtk_container_add (GTK_CONTAINER (window), drawing_area);

    if ((geometry == NULL)
        || !gtk_window_parse_geometry (GTK_WINDOW (window), geometry))
    {
        gtk_window_set_default_size (GTK_WINDOW (window), 640, 480);
    }

    gtk_widget_show (window);

    gtk_timeout_add(12, update, NULL);

    struct timeval tv;
    gettimeofday(&tv, NULL);
    start_msec = tv.tv_sec * 1000 + tv.tv_usec / 1000;

    gtk_main ();

    return EX_OK;
}