1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2012 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 #include "SDL_config.h"
23
24 /*
25 ScreenBlaster 3 functions
26
27 Patrice Mandin
28 */
29
30 /*--- Includes ---*/
31
32 #include "SDL_stdinc.h"
33 #include "SDL_xbios.h"
34 #include "SDL_xbios_sb3.h"
35
36 /*--- Defines ---*/
37
38 const int SDL_XBIOS_scpn_planes_device[]={
39 SCPN_DEV_1BPP,
40 SCPN_DEV_4BPP,
41 SCPN_DEV_8BPP,
42 SCPN_DEV_16BPP,
43 SCPN_DEV_2BPP,
44 SCPN_DEV_4BPP,
45 SCPN_DEV_1BPP
46 };
47
48 /*--- Functions ---*/
49
SDL_XBIOS_SB3Usable(scpn_cookie_t * cookie_scpn)50 int SDL_XBIOS_SB3Usable(scpn_cookie_t *cookie_scpn)
51 {
52 scpn_screeninfo_t *scrinfo;
53 int bpp;
54
55 /* Check if current SB3 mode is usable, i.e. 8 or 16bpp */
56 scrinfo = cookie_scpn->screen_info;
57 bpp = 1<<(SDL_XBIOS_scpn_planes_device[scrinfo->device]);
58
59 if ((bpp==8) || (bpp==16)) {
60 return 1;
61 }
62
63 return 0;
64 }
65
SDL_XBIOS_ListSB3Modes(_THIS,int actually_add,scpn_cookie_t * cookie_scpn)66 void SDL_XBIOS_ListSB3Modes(_THIS, int actually_add, scpn_cookie_t *cookie_scpn)
67 {
68 scpn_screeninfo_t *scrinfo;
69 xbiosmode_t modeinfo;
70
71 scrinfo = cookie_scpn->screen_info;
72 if (actually_add) {
73 scrinfo->h_pos = scrinfo->v_pos = 0;
74 }
75
76 modeinfo.number = -1;
77 modeinfo.width = scrinfo->virtual_width;
78 modeinfo.height = scrinfo->virtual_height;
79 modeinfo.depth = 1<<(SDL_XBIOS_scpn_planes_device[scrinfo->device]);
80 modeinfo.flags = (modeinfo.depth == 8 ? XBIOSMODE_C2P : 0);
81
82 SDL_XBIOS_AddMode(this, actually_add, &modeinfo);
83 }
84