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annotate src/video/xbios/SDL_xbios_sb3.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
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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
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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 ScreenBlaster 3 functions
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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 /*--- Includes ---*/
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30
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31 #include "SDL_xbios.h"
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32 #include "SDL_xbios_sb3.h"
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33
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34 /*--- Defines ---*/
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35
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36 const int SDL_XBIOS_scpn_planes_device[]={
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37 SCPN_DEV_1BPP,
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38 SCPN_DEV_4BPP,
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39 SCPN_DEV_8BPP,
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40 SCPN_DEV_16BPP,
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41 SCPN_DEV_2BPP,
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42 SCPN_DEV_4BPP,
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43 SCPN_DEV_1BPP
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44 };
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45
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46 /*--- Functions ---*/
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47
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48 int SDL_XBIOS_SB3Usable(scpn_cookie_t *cookie_scpn)
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49 {
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50 scpn_screeninfo_t *scrinfo;
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51 int bpp;
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52
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53 /* Check if current SB3 mode is usable, i.e. 8 or 16bpp */
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54 scrinfo = cookie_scpn->screen_info;
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55 bpp = 1<<(SDL_XBIOS_scpn_planes_device[scrinfo->device]);
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56
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57 if ((bpp==8) || (bpp==16)) {
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58 return 1;
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59 }
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60
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61 return 0;
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62 }
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63
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64 void SDL_XBIOS_SB3Init(_THIS, scpn_cookie_t *cookie_scpn)
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65 {
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66 xbiosmode_t *current_mode;
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67 scpn_screeninfo_t *scrinfo;
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68
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69 /* SB3 prevent changing video modes, we can only use current one */
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70
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71 XBIOS_nummodes = 1;
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72 current_mode = XBIOS_modelist;
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73 current_mode->number = -1;
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74
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75 scrinfo = cookie_scpn->screen_info;
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76 current_mode->width = scrinfo->virtual_width;
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77 current_mode->height = scrinfo->virtual_height;
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78 current_mode->depth = 1<<(SDL_XBIOS_scpn_planes_device[scrinfo->device]);
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79 scrinfo->h_pos = scrinfo->v_pos = 0;
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80 }