annotate src/video/xbios/SDL_xbios_sb3.h @ 1542:a8bf1aa21020

Fixed bug #15 SDL_blit_A.mmx-speed.patch.txt -- Speed improvements and a bugfix for the current GCC inline mmx asm code: - Changed some ops and removed some resulting useless ones. - Added some instruction parallelism (some gain) The resulting speed on my Xeon improved upto 35% depending on the function (measured in fps). - Fixed a bug where BlitRGBtoRGBSurfaceAlphaMMX() was setting the alpha component on the destination surfaces (to opaque-alpha) even when the surface had none. SDL_blit_A.mmx-msvc.patch.txt -- MSVC mmx intrinsics version of the same GCC asm code. MSVC compiler tries to parallelize the code and to avoid register stalls, but does not always do a very good job. Per-surface blending MSVC functions run quite a bit faster than their pure-asm counterparts (upto 55% faster for 16bit ones), but the per-pixel blending runs somewhat slower than asm. - BlitRGBtoRGBSurfaceAlphaMMX and BlitRGBtoRGBPixelAlphaMMX (and all variants) can now also handle formats other than (A)RGB8888. Formats like RGBA8888 and some quite exotic ones are allowed -- like RAGB8888, or actually anything having channels aligned on 8bit boundary and full 8bit alpha (for per-pixel alpha blending). The performance cost of this change is virtually 0 for per-surface alpha blending (no extra ops inside the loop) and a single non-MMX op inside the loop for per-pixel blending. In testing, the per-pixel alpha blending takes a ~2% performance hit, but it still runs much faster than the current code in CVS. If necessary, a separate function with this functionality can be made. This code requires Processor Pack for VC6.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 15:39:29 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
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 #include "SDL_config.h"
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23
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24 /*
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25 ScreenBlaster 3 definitions
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26
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27 Patrice Mandin
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28 */
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29
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30 #ifndef _SDL_xbios_sb3_h_
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31 #define _SDL_xbios_sb3_h_
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32
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33 /*--- Defines ---*/
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34
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35 #ifndef C_SCPN
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36 #define C_SCPN 0x5343504EL
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37 #endif
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38
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39 #define SCPN_DEV_1BPP 0
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40 #define SCPN_DEV_2BPP 1
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41 #define SCPN_DEV_4BPP 2
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42 #define SCPN_DEV_8BPP 3
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43 #define SCPN_DEV_16BPP 4
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44
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45 extern const int SDL_XBIOS_scpn_planes_device[];
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46
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47 /*--- Types ---*/
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48
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49 typedef struct {
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50 unsigned short virtual_width; /* Virtual screen width */
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51 unsigned short virtual_height; /* Virtual screen height */
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52 unsigned short visible_width; /* Visible width */
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53 unsigned short visible_height; /* Visible height */
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54 unsigned short h_pos; /* Horizontal position in virtual screen */
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55 unsigned short v_pos; /* Vertical position in virtual screen */
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56 unsigned short dummy;
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57 unsigned long size; /* Size of screen in bytes */
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58 unsigned short device; /* Device number to find planes = getRez() */
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59 /* = Index in scpn_planes_device[] */
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60 } __attribute__((packed)) scpn_screeninfo_t;
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61
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62 typedef struct {
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63 unsigned long magic; /* just a BRA assembler jump */
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64 unsigned short version;
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65 void *dummy1;
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66 unsigned short ptsout0_1;
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67 unsigned short ptsout0_2;
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68 unsigned short dummy3;
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69 unsigned char date[8]; /* Date of program build */
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70 unsigned char asm_string[30]; /* 10 times the 'ASM' string */
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71 unsigned short dummy4;
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72 scpn_screeninfo_t *screen_info;
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73 unsigned short dummy6;
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74 } __attribute__((packed)) scpn_cookie_t;
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75
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76 /*--- Function prototypes ---*/
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77
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78 int SDL_XBIOS_SB3Usable(scpn_cookie_t *cookie_scpn);
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79
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80 void SDL_XBIOS_SB3Init(_THIS, scpn_cookie_t *cookie_scpn);
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81
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82 #endif /* _SDL_xbios_sb3_h_ */