2 * $Id: video_x11.c,v 1.13 2007-09-08 04:05:35 nkeynes Exp $
4 * Shared functions for all X11-based display drivers.
6 * Copyright (c) 2005 Nathan Keynes.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
22 #include "drivers/video_x11.h"
24 extern uint32_t video_width, video_height;
27 * General X11 parameters. The front-end driver is expected to set this up
28 * by calling video_glx_init after initializing itself.
30 static Display *video_x11_display = NULL;
31 static Screen *video_x11_screen = NULL;
32 static Window video_x11_window = 0;
37 static GLXContext glx_context;
38 static Window glx_window;
39 static XSetWindowAttributes win_attrs;
41 gboolean video_glx_init( Display *display, Screen *screen, Window window,
42 int width, int height, display_driver_t driver )
44 video_x11_display = display;
45 video_x11_screen = screen;
46 video_x11_window = window;
48 if( !video_glx_create_window(width,height) ) {
52 if( gl_fbo_is_supported() ) {
57 ERROR( "Framebuffer objects not supported (required in this version)" );
63 gboolean video_glx_create_window( int width, int height )
66 const char *glxExts, *glxServer;
67 int visual_attrs[] = { GLX_RGBA, GLX_RED_SIZE, 4,
74 int screen = XScreenNumberOfScreen(video_x11_screen);
77 if( glXQueryVersion( video_x11_display, &major, &minor ) == False ) {
78 ERROR( "X Display lacks the GLX nature" );
81 if( major < 1 || minor < 2 ) {
82 ERROR( "X display supports GLX %d.%d, but we need at least 1.2", major, minor );
86 /* Find ourselves a nice visual */
87 visual = glXChooseVisual( video_x11_display,
90 if( visual == NULL ) {
91 ERROR( "Unable to obtain a compatible visual" );
95 /* And a matching gl context */
96 glx_context = glXCreateContext( video_x11_display, visual, None, True );
97 if( glx_context == NULL ) {
98 ERROR( "Unable to obtain a GLX Context. Possibly your system is broken in some small, undefineable way" );
103 /* Ok, all good so far. Unfortunately the visual we need to use will
104 * almost certainly be different from the one our frame is using. Which
105 * means we have to jump through the following hoops to create a
106 * child window with the appropriate settings.
108 win_attrs.event_mask = 0;
109 win_attrs.colormap = XCreateColormap( video_x11_display,
110 RootWindowOfScreen(video_x11_screen),
111 visual->visual, AllocNone );
112 glx_window = XCreateWindow( video_x11_display, video_x11_window,
113 0, 0, width, height, 0, visual->depth,
114 InputOutput, visual->visual,
115 CWColormap | CWEventMask,
117 if( glx_window == None ) {
118 /* Hrm. Aww, no window? */
119 ERROR( "Unable to create GLX window" );
120 glXDestroyContext( video_x11_display, glx_context );
121 if( win_attrs.colormap )
122 XFreeColormap( video_x11_display, win_attrs.colormap );
125 XMapRaised( video_x11_display, glx_window );
127 /* And finally set the window to be the active drawing area */
128 if( glXMakeCurrent( video_x11_display, glx_window, glx_context ) == False ) {
129 /* Ok you have _GOT_ to be kidding me */
130 ERROR( "Unable to prepare GLX window for drawing" );
131 XDestroyWindow( video_x11_display, glx_window );
132 XFreeColormap( video_x11_display, win_attrs.colormap );
133 glXDestroyContext( video_x11_display, glx_context );
139 void video_glx_shutdown()
141 if( glx_window != None ) {
142 XDestroyWindow( video_x11_display, glx_window );
143 XFreeColormap( video_x11_display, win_attrs.colormap );
146 if( glx_context != NULL ) {
147 glXDestroyContext( video_x11_display, glx_context );
153 int video_glx_load_font( const gchar *font_name )
156 XFontStruct *font = XLoadQueryFont(video_x11_display, font_name );
160 lists = glGenLists(96);
161 glXUseXFont(font->fid, 32, 96, lists);
162 XFreeFont(video_x11_display, font);
166 void video_glx_swap_buffers( void )
168 glXSwapBuffers( video_x11_display, glx_window );
.