Mercurial > sdl-ios-xcode
view src/video/xbios/SDL_xbios_blowup.h @ 1259:36f24cdfcda7
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 |
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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 */ #ifndef _SDL_xbios_blowup_h #define _SDL_xbios_blowup_h #include "SDL_xbios.h" /*--- Types ---*/ typedef struct { /* 64 bytes */ unsigned short enabled; /* Extended mode enabled ? 0=yes, <>0=no */ unsigned short dummy10[6]; unsigned short registers_0E; /* value for register 0xffff820e */ unsigned short registers_10; /* value for register 0xffff8210 */ unsigned short dummy11[23]; /* 64 bytes */ unsigned short width; /* width-1 */ unsigned short height; /* height-1 */ unsigned short dummy20; unsigned long screensize; /* screensize in bytes */ unsigned short dummy21[8]; unsigned short virtual; /* Virtual screen ? */ unsigned short virwidth; /* Virtual screen width */ unsigned short virheight; /* Virtual screen height */ unsigned short dummy22; unsigned short monitor; /* Monitor defined for this mode */ unsigned short extension; /* Extended mode defined ? 0=yes, 1=no */ unsigned short dummy23[13]; /* 64 bytes */ unsigned short dummy30; unsigned short registers_82[6]; /* values for registers 0xffff8282-8c */ unsigned short dummy31[9]; unsigned short dummy32; unsigned short registers_A2[6]; /* values for registers 0xffff82a2-ac */ unsigned short dummy33[9]; /* 64 bytes */ unsigned short registers_C0; /* value for register 0xffff82c0 */ unsigned short registers_C2; /* value for register 0xffff82c2 */ unsigned short dummy40[30]; } __attribute__((packed)) blow_mode_t; typedef struct { blow_mode_t blowup_modes[10]; unsigned char num_mode[6]; unsigned long dummy; unsigned short montype; } __attribute__((packed)) blow_cookie_t; /*--- Functions prototypes ---*/ void SDL_XBIOS_BlowupInit(_THIS, blow_cookie_t *cookie_blow); #endif /* _SDL_xbios_blowup_h */