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annotate src/video/xbios/SDL_xbios_blowup.c @ 1040:c6ed27c7d47d

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Preliminary support for Blowup and Screen Blaster 3 extensions on Atari Falcon 030
author Patrice Mandin <patmandin@gmail.com>
date Tue, 22 Feb 2005 17:57:40 +0000
parents
children 0e7218843cfb
rev   line source
1040
c6ed27c7d47d Preliminary support for Blowup and Screen Blaster 3 extensions on Atari Falcon 030
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
c6ed27c7d47d Preliminary support for Blowup and Screen Blaster 3 extensions on Atari Falcon 030
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /*
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24 Blowup extension definitions
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25
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26 Patrice Mandin
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27 */
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28
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29 #include "SDL_xbios.h"
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30 #include "SDL_xbios_blowup.h"
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31
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32 void SDL_XBIOS_BlowupInit(_THIS, blow_cookie_t *cookie_blow)
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33 {
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34 int i, num_mode, bank, keep_old;
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35 xbiosmode_t *current_mode;
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36 blow_mode_t *blow_mode;
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37
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38 current_mode = XBIOS_modelist;
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39 for (i=0;i<XBIOS_nummodes;i++) {
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40 keep_old=1; /* use default mode */
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41 blow_mode = NULL;
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42 switch (current_mode->depth) {
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43 case 1:
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44 num_mode=0;
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45 break;
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46 case 2:
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47 num_mode=1;
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48 break;
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49 case 4:
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50 num_mode=2;
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51 break;
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52 case 8:
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53 num_mode=3;
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54 break;
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55 case 16:
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56 num_mode=4;
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57 break;
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58 default:
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59 num_mode=-1;
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60 break;
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61 }
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62
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63 /* Check which bank of modes to use */
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64 if (num_mode>=0) {
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65 bank = cookie_blow->num_mode[num_mode];
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66 blow_mode = &(cookie_blow->blowup_modes[num_mode+(bank*5)]);
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67
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68 /* Check extended mode enabled */
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69 if (blow_mode->enabled == 0) {
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70 /* Check monitor needed for this mode */
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71 if ((blow_mode->monitor == cookie_blow->montype)
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72 || ((blow_mode->monitor == MONITOR_TV)
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73 && (cookie_blow->montype == MONITOR_RGB))
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74 || ((blow_mode->monitor == MONITOR_RGB)
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75 && (cookie_blow->montype == MONITOR_TV)))
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76 {
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77 keep_old = 0; /* we can use this extended mode */
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78 }
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79 }
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80 }
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81
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82 if (keep_old) {
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83 /* disable blowup for this mode */
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84 current_mode->number |= (1<<15);
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85 } else {
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86 /* Update mode size */
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87 current_mode->width = blow_mode->width +1;
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88 current_mode->height = blow_mode->height +1;
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89 }
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90
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91 current_mode++;
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92 }
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93 }