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view src/video/xbios/SDL_xbios_sb3.h @ 1259:36f24cdfcda7

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te: Thu, 17 Apr 2003 11:25:26 -0700 From: "Jim" Subject: [SDL] Frame buffer patches... Would seem that GCC 3.2.2 promotes all signed values to unsigned if any single vlaue is unsigned in an expression... for instance when calculating an elo touch position....evertyhign is an (int) except for cach_vinfo.xres which is unsigned. THerefore if y ou reverse the SDL_ELO_MIN_X and SDL_ELO_MAX_X values the resulging negative value pegs the expression to it's max. Attached it the accumu lated patch to typecast the unsigned values to (int) - *dx = (cache_vinfo.xres - (cache_vinfo.xres * (input_x - ELO_MIN_X)) / width); + *dx = ((int)cache_vinfo.xres - ((int)cache_vinfo.xres * (input_x - ELO_MIN_X)) / width); and also to provide quite failure to operations which have the screen currently locked... The touch screen I'm using the original values were exactly opposite of any position I touched on the screen - evaluating the math the expr ession SHOULD have handled reversing the min and max values - and after casting the unsigned .xres and .yres to a signed int - worked well. .. Jim
author Sam Lantinga <slouken@libsdl.org>
date Tue, 24 Jan 2006 06:36:43 +0000
parents c6ed27c7d47d
children d910939febfa
line wrap: on
line source

/*
    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
*/

/*
	ScreenBlaster 3 definitions

	Patrice Mandin
*/

#ifndef _SDL_xbios_sb3_h_
#define _SDL_xbios_sb3_h_

/*--- Defines ---*/

#ifndef C_SCPN
#define C_SCPN 0x5343504EL
#endif

#define SCPN_DEV_1BPP	0
#define SCPN_DEV_2BPP	1
#define SCPN_DEV_4BPP	2
#define SCPN_DEV_8BPP	3
#define SCPN_DEV_16BPP	4

extern const int SDL_XBIOS_scpn_planes_device[];

/*--- Types ---*/

typedef struct {
	unsigned short	virtual_width;	/* Virtual screen width */
	unsigned short	virtual_height;	/* Virtual screen height */
	unsigned short	visible_width;	/* Visible width */
	unsigned short	visible_height;	/* Visible height */
	unsigned short	h_pos;	/* Horizontal position in virtual screen */
	unsigned short	v_pos;	/* Vertical position in virtual screen */
	unsigned short	dummy;
	unsigned long	size;	/* Size of screen in bytes */
	unsigned short	device;	/* Device number to find planes = getRez() */
							/* = Index in scpn_planes_device[] */
} __attribute__((packed)) scpn_screeninfo_t;

typedef struct {
	unsigned long	magic;	/* just a BRA assembler jump */
	unsigned short	version;
	void			*dummy1;
	unsigned short	ptsout0_1;
	unsigned short	ptsout0_2;
	unsigned short	dummy3;
	unsigned char	date[8];	/* Date of program build */
	unsigned char	asm_string[30];	/* 10 times the 'ASM' string */
	unsigned short	dummy4;
	scpn_screeninfo_t	*screen_info;
	unsigned short	dummy6;
} __attribute__((packed)) scpn_cookie_t;

/*--- Function prototypes ---*/

int SDL_XBIOS_SB3Usable(scpn_cookie_t *cookie_scpn);

void SDL_XBIOS_SB3Init(_THIS, scpn_cookie_t *cookie_scpn);

#endif /* _SDL_xbios_sb3_h_ */