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/*
* Copyright (C) 1998 Janne Löf <jlof@mail.student.oulu.fi>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <glib.h> /* For G_OS_WIN32 */
#include <math.h>
#include <gtk/gtk.h>
#ifdef G_OS_WIN32
#include <windows.h>
#endif
#include <GL/gl.h>
#include <gdk/gdk.h>
#include <gtkgl/gdkgl.h>
int visual_attributes[] = { GDK_GL_RGBA,
GDK_GL_RED_SIZE,1,
GDK_GL_GREEN_SIZE,1,
GDK_GL_BLUE_SIZE,1,
GDK_GL_NONE };
int main(int argc, char **argv)
{
GtkWidget *window,*pixmapwidget;
GdkVisual *visual;
GdkPixmap *pixmap;
GdkGLPixmap *glpixmap;
GdkGLContext *context;
gtk_init(&argc, &argv);
/* check opengl */
if (gdk_gl_query() == FALSE) {
g_print("OpenGL not supported\n");
return 0;
}
/* select and use visual as default so all widgets are OpenGL renderable */
visual = gdk_gl_choose_visual(visual_attributes);
if (visual == NULL) {
g_print("Can't get visual\n");
return 0;
}
gtk_widget_set_default_colormap(gdk_colormap_new(visual, TRUE));
gtk_widget_set_default_visual(visual);
/* top level window. */
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), "glpixmap");
gtk_container_set_border_width(GTK_CONTAINER(window), 10);
gtk_signal_connect(GTK_OBJECT(window), "delete_event",
GTK_SIGNAL_FUNC(gtk_main_quit), NULL);
gtk_widget_set_usize(window, 100,100);
gtk_widget_show(window);
/* pixmap */
context = gdk_gl_context_new(visual);
pixmap = gdk_pixmap_new(NULL, 80,80, gdk_visual_get_depth (visual));
glpixmap = gdk_gl_pixmap_new(visual, pixmap);
if (gdk_gl_pixmap_make_current(glpixmap, context)) {
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0,100,100,0,-1,1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClearColor(0,0,0,1);
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1,1,1);
glBegin(GL_TRIANGLES);
glVertex2f(10,10);
glVertex2f(10,90);
glVertex2f(90,90);
glEnd();
}
gdk_gl_context_unref(context);
gdk_gl_pixmap_unref(glpixmap);
/* pixmapwidget */
pixmapwidget = gtk_pixmap_new( pixmap, NULL );
gdk_pixmap_unref(pixmap);
gtk_container_add(GTK_CONTAINER(window), pixmapwidget);
gtk_widget_show(pixmapwidget);
gtk_main();
return 0;
}
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