src/video/ataricommon/SDL_xbiosevents.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 10 Mar 2002 03:33:59 +0000
changeset 305 9c6613983e85
child 331 e9278438fb3b
permissions -rw-r--r--
Atari port cleanups from Patrice
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Library General Public
     7     License as published by the Free Software Foundation; either
     8     version 2 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Library General Public License for more details.
    14 
    15     You should have received a copy of the GNU Library General Public
    16     License along with this library; if not, write to the Free
    17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 
    23 #ifdef SAVE_RCSID
    24 static char rcsid =
    25  "@(#) $Id$";
    26 #endif
    27 
    28 /*
    29  *	XBIOS mouse & joystick vectors
    30  *
    31  *	Patrice Mandin
    32  */
    33 
    34 #include <stdlib.h>
    35 #include <string.h>
    36 #include <mint/osbind.h>
    37 
    38 #include "SDL_events_c.h"
    39 #include "SDL_xbiosevents_c.h"
    40 #include "SDL_xbiosinterrupt_s.h"
    41 
    42 /* Variables */
    43 
    44 int SDL_AtariXbios_enabled=0;
    45 
    46 static _KBDVECS *kbdvecs;		/* Pointer to access vectors */
    47 static _KBDVECS sys_kbdvecs;	/* Backup of system vectors */
    48 static Uint16 atari_prevmouseb;	/* buttons */
    49 
    50 void SDL_AtariXbios_InstallVectors(int vectors_mask)
    51 {
    52 	void *oldpile;
    53 
    54 	/* Clear variables */
    55 	SDL_AtariXbios_mouseb =
    56 		SDL_AtariXbios_mousex =
    57 		SDL_AtariXbios_mousey =
    58 		SDL_AtariXbios_joystick =
    59 		atari_prevmouseb = 0;
    60 
    61 	/* Read IKBD vectors base */
    62 	kbdvecs=Kbdvbase();
    63 
    64 	/* Go to supervisor mode */
    65 	oldpile=(void *)Super(0);
    66 
    67 	/* Backup system vectors */
    68 	memcpy(&sys_kbdvecs, kbdvecs, sizeof(_KBDVECS));
    69 
    70 	/* Install our vector */
    71 	SDL_AtariXbios_Install(
    72 		kbdvecs,
    73 		(vectors_mask & ATARI_XBIOS_MOUSEEVENTS) ? SDL_AtariXbios_MouseVector : NULL,
    74 		(vectors_mask & ATARI_XBIOS_JOYSTICKEVENTS) ? SDL_AtariXbios_JoystickVector : NULL
    75 	);
    76 
    77 	/* Back to user mode */
    78 	Super(oldpile);
    79 
    80 	SDL_AtariXbios_enabled=1;
    81 }
    82 
    83 void SDL_AtariXbios_RestoreVectors(void)
    84 {
    85 	void *oldpile;
    86 
    87 	/* Go to supervisor mode */
    88 	oldpile=(void *)Super(NULL);
    89 
    90 	/* Reinstall system vector */
    91 	SDL_AtariXbios_Install(kbdvecs,sys_kbdvecs.mousevec,sys_kbdvecs.joyvec);
    92 
    93 	/* Back to user mode */
    94 	Super(oldpile);
    95 }
    96 
    97 static int atari_GetButton(int button)
    98 {
    99 	switch(button)
   100 	{
   101 		case 0:
   102 			return SDL_BUTTON_RIGHT;
   103 			break;
   104 		case 1:
   105 		default:
   106 			return SDL_BUTTON_LEFT;
   107 			break;
   108 	}
   109 }
   110 
   111 void SDL_AtariXbios_PostMouseEvents(_THIS)
   112 {
   113 	/* Mouse motion ? */
   114 	if (SDL_AtariXbios_mousex || SDL_AtariXbios_mousey) {
   115 		SDL_PrivateMouseMotion(0, 1, SDL_AtariXbios_mousex, SDL_AtariXbios_mousey);
   116 		SDL_AtariXbios_mousex = SDL_AtariXbios_mousey = 0;
   117 	}
   118 	
   119 	/* Mouse button ? */
   120 	if (SDL_AtariXbios_mouseb != atari_prevmouseb) {
   121 		int i;
   122 
   123 		for (i=0;i<2;i++) {
   124 			int curbutton, prevbutton;
   125 
   126 			curbutton = SDL_AtariXbios_mouseb & (1<<i);
   127 			prevbutton = atari_prevmouseb & (1<<i);
   128 
   129 			if (curbutton & !prevbutton) {
   130 				SDL_PrivateMouseButton(SDL_PRESSED, atari_GetButton(i), 0, 0);
   131 			}
   132 			if (!curbutton & prevbutton) {
   133 				SDL_PrivateMouseButton(SDL_RELEASED, atari_GetButton(i), 0, 0);
   134 			}
   135 		}
   136 		atari_prevmouseb = SDL_AtariXbios_mouseb;
   137 	}
   138 }