nkeynes@94: /**
nkeynes@108:  * $Id: video_x11.c,v 1.3 2006-03-15 13:16:46 nkeynes Exp $
nkeynes@94:  *
nkeynes@103:  * Shared functions for all X11-based display drivers.
nkeynes@94:  *
nkeynes@94:  * Copyright (c) 2005 Nathan Keynes.
nkeynes@94:  *
nkeynes@94:  * This program is free software; you can redistribute it and/or modify
nkeynes@94:  * it under the terms of the GNU General Public License as published by
nkeynes@94:  * the Free Software Foundation; either version 2 of the License, or
nkeynes@94:  * (at your option) any later version.
nkeynes@94:  *
nkeynes@94:  * This program is distributed in the hope that it will be useful,
nkeynes@94:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@94:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@94:  * GNU General Public License for more details.
nkeynes@94:  */
nkeynes@94: 
nkeynes@103: #include <X11/Xlib.h>
nkeynes@103: #include <GL/glx.h>
nkeynes@103: #include "dream.h"
nkeynes@103: #include "video.h"
nkeynes@94: #include "drivers/video_x11.h"
nkeynes@94: 
nkeynes@103: /**
nkeynes@103:  * General X11 parameters. The front-end driver is expected to set this up
nkeynes@103:  * by calling video_x11_set_display after initializing itself.
nkeynes@103:  */
nkeynes@94: Display *video_x11_display = NULL;
nkeynes@94: Screen *video_x11_screen = NULL;
nkeynes@94: Window video_x11_window = 0;
nkeynes@94: 
nkeynes@103: /**
nkeynes@103:  * GLX parameters.
nkeynes@103:  */
nkeynes@103: GLXContext glx_context;
nkeynes@103: Window glx_window;
nkeynes@103: gboolean glx_open = FALSE;
nkeynes@103: 
nkeynes@94: void video_x11_set_display( Display *display, Screen *screen, Window window )
nkeynes@94: {
nkeynes@94:     video_x11_display = display;
nkeynes@94:     video_x11_screen = screen;
nkeynes@94:     video_x11_window = window;
nkeynes@94: }
nkeynes@94: 
nkeynes@103: 
nkeynes@103: gboolean video_glx_create_window( int x, int y, int width, int height )
nkeynes@103: {
nkeynes@103:     int major, minor;
nkeynes@103:     const char *glxExts, *glxServer;
nkeynes@103:     int visual_attrs[] = { GLX_RGBA, GLX_RED_SIZE, 4, 
nkeynes@103: 			   GLX_GREEN_SIZE, 4, 
nkeynes@103: 			   GLX_BLUE_SIZE, 4,
nkeynes@103: 			   GLX_ALPHA_SIZE, 4,
nkeynes@103: 			   GLX_DEPTH_SIZE, 16,
nkeynes@103: 			   GLX_DOUBLEBUFFER, 
nkeynes@103: 			   None };
nkeynes@103:     int screen = XScreenNumberOfScreen(video_x11_screen);
nkeynes@103:     XSetWindowAttributes win_attrs;
nkeynes@103:     XVisualInfo *visual;
nkeynes@103: 
nkeynes@103:     if( glXQueryVersion( video_x11_display, &major, &minor ) == False ) {
nkeynes@103: 	ERROR( "X Display lacks the GLX nature" );
nkeynes@103: 	return FALSE;
nkeynes@103:     }
nkeynes@103:     if( major < 1 || minor < 2 ) {
nkeynes@103: 	ERROR( "X display supports GLX %d.%d, but we need at least 1.2", major, minor );
nkeynes@103: 	return FALSE;
nkeynes@103:     }
nkeynes@103: 
nkeynes@103:     glxExts = glXQueryExtensionsString( video_x11_display, screen );
nkeynes@103:     glxServer = glXQueryServerString( video_x11_display, screen, GLX_VENDOR );
nkeynes@103:     INFO( "GLX version %d.%d, %s. Supported exts: %s", major, minor,
nkeynes@103: 	  glxServer, glxExts );
nkeynes@103: 
nkeynes@103:     /* Find ourselves a nice visual */
nkeynes@103:     visual = glXChooseVisual( video_x11_display, 
nkeynes@103: 			      screen,
nkeynes@103: 			      visual_attrs );
nkeynes@103:     if( visual == NULL ) {
nkeynes@103: 	ERROR( "Unable to obtain a compatible visual" );
nkeynes@103: 	return FALSE;
nkeynes@103:     }
nkeynes@103: 
nkeynes@103:     /* And a matching gl context */
nkeynes@103:     glx_context = glXCreateContext( video_x11_display, visual, None, True );
nkeynes@103:     if( glx_context == NULL ) {
nkeynes@103: 	ERROR( "Unable to obtain a GLX Context. Possibly your system is broken in some small, undefineable way" );
nkeynes@103: 	return FALSE;
nkeynes@103:     }
nkeynes@103:     
nkeynes@103: 
nkeynes@103:     /* Ok, all good so far. Unfortunately the visual we need to use will 
nkeynes@103:      * almost certainly be different from the one our frame is using. Which 
nkeynes@103:      * means we have to jump through the following hoops to create a 
nkeynes@103:      * child window with the appropriate settings.
nkeynes@103:      */
nkeynes@103:     win_attrs.event_mask = 0;
nkeynes@103:     win_attrs.colormap = XCreateColormap( video_x11_display, 
nkeynes@103: 					  RootWindowOfScreen(video_x11_screen),
nkeynes@103: 					  visual->visual, AllocNone );
nkeynes@103:     glx_window = XCreateWindow( video_x11_display, video_x11_window, 
nkeynes@103: 				x, y, width, height, 0, visual->depth, 
nkeynes@103: 				InputOutput, visual->visual, 
nkeynes@103: 				CWColormap | CWEventMask, 
nkeynes@103: 				&win_attrs );
nkeynes@103:     if( glx_window == None ) {
nkeynes@103: 	/* Hrm. Aww, no window? */
nkeynes@103: 	ERROR( "Unable to create GLX window" );
nkeynes@103: 	glXDestroyContext( video_x11_display, glx_context );
nkeynes@103: 	if( win_attrs.colormap ) 
nkeynes@103: 	    XFreeColormap( video_x11_display, win_attrs.colormap );
nkeynes@103: 	return FALSE;
nkeynes@103:     }
nkeynes@103:     XMapRaised( video_x11_display, glx_window );
nkeynes@103: 
nkeynes@103:     /* And finally set the window to be the active drawing area */
nkeynes@103:     if( glXMakeCurrent( video_x11_display, glx_window, glx_context ) == False ) {
nkeynes@103: 	/* Ok you have _GOT_ to be kidding me */
nkeynes@103: 	ERROR( "Unable to prepare GLX window for drawing" );
nkeynes@103: 	XDestroyWindow( video_x11_display, glx_window );
nkeynes@103: 	XFreeColormap( video_x11_display, win_attrs.colormap );
nkeynes@103: 	glXDestroyContext( video_x11_display, glx_context );
nkeynes@103: 	return FALSE;
nkeynes@103:     }
nkeynes@103:     
nkeynes@103:     glx_open = TRUE;
nkeynes@103:     return TRUE;
nkeynes@103: }
nkeynes@103: 
nkeynes@108: int video_glx_load_font( const gchar *font_name )
nkeynes@108: {
nkeynes@108:     int lists;
nkeynes@108:     XFontStruct *font = XLoadQueryFont(video_x11_display, font_name );
nkeynes@108:     if (font == NULL)
nkeynes@108: 	return -1;
nkeynes@108:     
nkeynes@108:     lists = glGenLists(96);
nkeynes@108:     glXUseXFont(font->fid, 32, 96, lists);
nkeynes@108:     XFreeFont(video_x11_display, font);
nkeynes@108: }
nkeynes@108: 
nkeynes@108: 
nkeynes@108: 
nkeynes@108: gboolean video_glx_set_render_format( int x, int y, int width, int height )
nkeynes@108: {
nkeynes@108:     if( glx_open )
nkeynes@108: 	return TRUE;
nkeynes@108:     return video_glx_create_window( x, y, width, height );
nkeynes@108: }
nkeynes@108: 
nkeynes@103: void video_glx_swap_buffers( void )
nkeynes@103: {
nkeynes@103:     glXSwapBuffers( video_x11_display, glx_window );
nkeynes@103: }
nkeynes@103: 
nkeynes@103: void video_glx_create_pixmap( int width, int height )
nkeynes@103: {
nkeynes@103: 
nkeynes@103: }