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view src/video/ps2gs/SDL_gsvideo.h @ 638:b0108e9dea53

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Date: Sun, 11 May 2003 19:59:06 +0300 From: Pasi K?rkk?inen Subject: [PATCH] fix SDL OpenGL segfault with DRI/Mesa drivers and Glew Hello! The attached patch fixes a bug in SDL which causes SDL to crash in X11_GL_Shutdown() if you are using DRI/Mesa drivers AND glew (http://glew.sf.net). The bug is caused by a namespace collision affecting dlsym() to fetch wrong pointer for glXReleaseBuffersMESA() (uninitialized pointer from glew because the extension is NOT supported by the driver) and then SDL calling it in X11_GL_Shutdown(). SDL should check if the glXReleaseBuffersMESA() is really supported by the driver (from the extensions string) before calling it. Attached patch adds extension string parsing to check if glXReleaseBuffersMESA() is really supported (and this way prevents the segfault). Availability of the extensions should be _always_ checked from the extensions string rather than using dlsym()! Please add it to the next version of SDL. Thanks to gltron and author of glew to help fixing this.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 28 Jun 2003 17:27:33 +0000
parents e8157fcb3114
children c9b51268668f
line wrap: on
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000  Sam Lantinga

    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
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

#ifndef _SDL_gsvideo_h
#define _SDL_gsvideo_h

#include <sys/types.h>
#include <termios.h>
#include <linux/ps2/dev.h>
#include <linux/ps2/gs.h>

#include "SDL_mouse.h"
#include "SDL_mutex.h"
#include "SDL_sysvideo.h"

/* Hidden "this" pointer for the video functions */
#define _THIS	SDL_VideoDevice *this


/* Private display data */
struct SDL_PrivateVideoData {
	/* Gotta love that simple PS2 graphics interface. :) */
	int console_fd;
	int memory_fd;
	struct ps2_screeninfo saved_vinfo;

	/* Ye olde linux keyboard code */
	int current_vt;
	int saved_vt;
	int keyboard_fd;
	int saved_kbd_mode;
	struct termios saved_kbd_termios;

	/* Ye olde linux mouse code */
	int mouse_fd;
	int cursor_drawn;

	/* The memory mapped DMA area and associated variables */
	caddr_t mapped_mem;
	int pixels_len;
	int mapped_len;
	struct ps2_image screen_image;
	int screen_image_size;
	unsigned long long *head_tags_mem;
	unsigned long long *image_tags_mem;
	unsigned long long *tex_tags_mem;
	unsigned long long *scale_tags_mem;
	int dma_pending;
};
/* Old variable names */
#define console_fd		(this->hidden->console_fd)
#define memory_fd		(this->hidden->memory_fd)
#define saved_vinfo		(this->hidden->saved_vinfo)
#define current_vt		(this->hidden->current_vt)
#define saved_vt		(this->hidden->saved_vt)
#define keyboard_fd		(this->hidden->keyboard_fd)
#define saved_kbd_mode		(this->hidden->saved_kbd_mode)
#define saved_kbd_termios	(this->hidden->saved_kbd_termios)
#define mouse_fd		(this->hidden->mouse_fd)
#define cursor_drawn		(this->hidden->cursor_drawn)
#define mapped_mem		(this->hidden->mapped_mem)
#define pixels_len		(this->hidden->pixels_len)
#define mapped_len		(this->hidden->mapped_len)
#define screen_image		(this->hidden->screen_image)
#define screen_image_size	(this->hidden->screen_image_size)
#define head_tags_mem		(this->hidden->head_tags_mem)
#define image_tags_mem		(this->hidden->image_tags_mem)
#define tex_tags_mem		(this->hidden->tex_tags_mem)
#define scale_tags_mem		(this->hidden->scale_tags_mem)
#define dma_pending		(this->hidden->dma_pending)

/* Shared between the mouse and video code for screen update scaling */
extern int scaleimage_nonblock(int fd,
                               unsigned long long *tm, unsigned long long *sm);
#endif /* _SDL_gsvideo_h */