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annotate src/video/xbios/SDL_xbios_sb3.c @ 1240:3b8a43c428bb

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From Bug #36: There are a couple of issues with the selection of Altivec alpha-blitting routines in CalculateAlphaBlit() in src/video/SDL_Blit_A.c. 1) There's no check for the presence of Altivec when checking if the Blit32to565PixelAlphaAltivec() routine can be selected. 2) Altivec cannot be used in video memory, and there's no check if the destination surface is a hardware surface. (Alpha-blitting to a hardware surface with GPU support is a bad idea, but somebody's bound to do it anyway.) Patch to fix these attached.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 08 Jan 2006 21:18:15 +0000
parents fba6b67b4d60
children 3692456e7b0f
rev   line source
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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 <stdlib.h>
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32
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33 #include "SDL_xbios.h"
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34 #include "SDL_xbios_sb3.h"
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35
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36 /*--- Defines ---*/
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37
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38 const int SDL_XBIOS_scpn_planes_device[]={
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39 SCPN_DEV_1BPP,
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40 SCPN_DEV_4BPP,
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41 SCPN_DEV_8BPP,
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42 SCPN_DEV_16BPP,
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43 SCPN_DEV_2BPP,
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44 SCPN_DEV_4BPP,
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45 SCPN_DEV_1BPP
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46 };
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47
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48 /*--- Functions ---*/
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49
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50 int SDL_XBIOS_SB3Usable(scpn_cookie_t *cookie_scpn)
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51 {
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52 scpn_screeninfo_t *scrinfo;
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53 int bpp;
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54
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55 /* Check if current SB3 mode is usable, i.e. 8 or 16bpp */
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56 scrinfo = cookie_scpn->screen_info;
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57 bpp = 1<<(SDL_XBIOS_scpn_planes_device[scrinfo->device]);
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58
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59 if ((bpp==8) || (bpp==16)) {
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60 return 1;
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61 }
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62
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63 return 0;
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64 }
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65
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66 void SDL_XBIOS_SB3Init(_THIS, scpn_cookie_t *cookie_scpn)
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67 {
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68 scpn_screeninfo_t *scrinfo;
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69
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70 /* SB3 prevent changing video modes, we can only use current one */
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71 if (XBIOS_modelist) {
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72 free(XBIOS_modelist);
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73 XBIOS_nummodes = 0;
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74 XBIOS_modelist = NULL;
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75 }
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76
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77 scrinfo = cookie_scpn->screen_info;
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78 scrinfo->h_pos = scrinfo->v_pos = 0;
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79
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80 SDL_XBIOS_AddMode(this,
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81 -1,
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82 scrinfo->virtual_width, scrinfo->virtual_height,
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83 1<<(SDL_XBIOS_scpn_planes_device[scrinfo->device]),
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84 SDL_FALSE
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85 );
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86 }