view src/video/x11/SDL_x11dga.c @ 1525:23a347cfbed8

Fixed bug #38 I'm using SDL 1.2.9 with Visual C++ 7.0 on Windows 2000. Here's the setup: my game starts in a window, with SDL_WM_GrabInput(SDL_GRAB_ON) to constrain the cursor to the game window. The mouse cursor is outside of the window when the game launches, and when the window appears the cursor is grabbed and placed at the top left corner of the inside of the game window. At this point, if I click the mouse without moving it, the SDL_MOUSEBUTTONDOWN event's mouse coordinates are (65535,65535).
author Sam Lantinga <slouken@libsdl.org>
date Tue, 14 Mar 2006 06:00:30 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb cbad710a6509
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    This library 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 2.1 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/* This is currently only used to enable DGA mouse.
   The new fullscreen code makes it very difficult to handle DGA dynamically.
   There will be a completely separate DGA driver that is fullscreen-only.
*/

#include "SDL_video.h"
#include "../SDL_cursor_c.h"
#include "SDL_x11dga_c.h"

/* Global for the error handler */
int dga_event, dga_error = -1;

void X11_EnableDGAMouse(_THIS)
{
#if SDL_VIDEO_DRIVER_X11_DGAMOUSE
    int dga_major, dga_minor;
    int use_dgamouse;
    const char *env_use_dgamouse;

    /* Check configuration to see if we should use DGA mouse */
    use_dgamouse = 1;
    env_use_dgamouse = SDL_getenv("SDL_VIDEO_X11_DGAMOUSE");
    if ( env_use_dgamouse ) {
        use_dgamouse = atoi(env_use_dgamouse);
    }
    /* Check for buggy X servers */
    if ( use_dgamouse && BUGGY_XFREE86(==, 4000) ) {
        use_dgamouse = 0;
    }
    /* Only use DGA mouse if the cursor is not showing (in relative mode) */
    if ( use_dgamouse && local_X11 && !(using_dga & DGA_MOUSE) &&
         SDL_NAME(XF86DGAQueryExtension)(SDL_Display, &dga_event, &dga_error) &&
         SDL_NAME(XF86DGAQueryVersion)(SDL_Display, &dga_major, &dga_minor) ) {
	if ( SDL_NAME(XF86DGADirectVideo)(SDL_Display, SDL_Screen, XF86DGADirectMouse) ) {
            using_dga |= DGA_MOUSE;
        }
    }
#endif /* SDL_VIDEO_DRIVER_X11_DGAMOUSE */
}

/* Argh.  Glide resets DGA mouse mode when it makes the context current! */
void X11_CheckDGAMouse(_THIS)
{
#if SDL_VIDEO_DRIVER_X11_DGAMOUSE
    int flags;

    if ( using_dga & DGA_MOUSE ) {
        SDL_NAME(XF86DGAQueryDirectVideo)(SDL_Display, SDL_Screen, &flags);
        if ( ! (flags & XF86DGADirectMouse) ) {
                SDL_NAME(XF86DGADirectVideo)(SDL_Display,SDL_Screen,XF86DGADirectMouse);
        }
    }
#endif
}

void X11_DisableDGAMouse(_THIS)
{
#if SDL_VIDEO_DRIVER_X11_DGAMOUSE
    if ( using_dga & DGA_MOUSE ) {
	SDL_NAME(XF86DGADirectVideo)(SDL_Display, SDL_Screen, 0);
        using_dga &= ~DGA_MOUSE;
    }
#endif /* SDL_VIDEO_DRIVER_X11_DGAMOUSE */
}