SDL_xbios_blowup.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2004 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
*/
/*
Blowup extension definitions
Patrice Mandin
*/
#include "SDL_xbios.h"
#include "SDL_xbios_blowup.h"
void SDL_XBIOS_BlowupInit(_THIS, blow_cookie_t *cookie_blow)
{
int i, num_mode, bank, keep_old;
xbiosmode_t *current_mode;
blow_mode_t *blow_mode;
current_mode = XBIOS_modelist;
for (i=0;i<XBIOS_nummodes;i++) {
keep_old=1; /* use default mode */
blow_mode = NULL;
switch (current_mode->depth) {
case 1:
num_mode=0;
break;
case 2:
num_mode=1;
break;
case 4:
num_mode=2;
break;
case 8:
num_mode=3;
break;
case 16:
num_mode=4;
break;
default:
num_mode=-1;
break;
}
/* Check which bank of modes to use */
if (num_mode>=0) {
bank = cookie_blow->num_mode[num_mode];
blow_mode = &(cookie_blow->blowup_modes[num_mode+(bank*5)]);
/* Check extended mode enabled */
if (blow_mode->enabled == 0) {
/* Check monitor needed for this mode */
if ((blow_mode->monitor == cookie_blow->montype)
|| ((blow_mode->monitor == MONITOR_TV)
&& (cookie_blow->montype == MONITOR_RGB))
|| ((blow_mode->monitor == MONITOR_RGB)
&& (cookie_blow->montype == MONITOR_TV)))
{
keep_old = 0; /* we can use this extended mode */
}
}
}
if (keep_old) {
/* disable blowup for this mode */
current_mode->number |= (1<<15);
} else {
/* Update mode size */
current_mode->width = blow_mode->width +1;
current_mode->height = blow_mode->height +1;
}
current_mode++;
}
}