Mercurial > sdl-ios-xcode
annotate src/video/SDL_memops.h @ 1295:c3e36ac8a94c
Date: Sun, 6 Mar 2005 17:06:20 +0100
From: Per Inge Mathisen
Subject: [SDL] Fullscreen refresh on win32
Windows has a terrible default for fullscreen 3D apps of 60mhz refresh
rate. This can be fixed by the user by going into his driver's
control panel and forcing the refresh rate higher. However, this not a
very user friendly way about it, and in any case SDL contains no code
that could figure out this that condition has afflicted the user.
So the question is, could SDL fix this for the user? It is possible
under Windows to request a higher refresh rate. The danger is of
course that if the user has an old monitor, and you request a too high
refresh rate, the monitor could be damaged. However, I believe there
might be a way around that: Check before switching what refresh rate
the user's desktop runs in, and if our fullscreen dimensions are equal
or less than those of the desktop, use the higher refresh rate of 60
and the desktop rate.
Since most users run their desktops in the same or higher resolution
something sane, this should fix this problem for most users.
Thoughts?
An alternative is to add an SDL_GL_GetAttribute(SDL_GL_REFRESH_RATE)
option so that programs can bitch at their users at their own
convenience.
- Per
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 30 Jan 2006 06:56:10 +0000 |
| parents | b8d311d90021 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 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 | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #ifndef _SDL_memops_h | |
| 29 #define _SDL_memops_h | |
| 30 | |
| 31 /* System dependent optimized memory manipulation routines: | |
| 32 */ | |
| 33 #include <string.h> | |
| 34 | |
| 35 #if defined(__GNUC__) && defined(i386) | |
| 36 /* Thanks to Brennan "Bas" Underwood, for the inspiration. :) | |
| 37 */ | |
| 38 #define SDL_memcpy(dst, src, len) \ | |
| 39 do { \ | |
| 40 int u0, u1, u2; \ | |
| 41 __asm__ __volatile__ ( \ | |
| 42 "cld\n\t" \ | |
| 43 "rep ; movsl\n\t" \ | |
| 44 "testb $2,%b4\n\t" \ | |
| 45 "je 1f\n\t" \ | |
| 46 "movsw\n" \ | |
| 47 "1:\ttestb $1,%b4\n\t" \ | |
| 48 "je 2f\n\t" \ | |
| 49 "movsb\n" \ | |
| 50 "2:" \ | |
| 51 : "=&c" (u0), "=&D" (u1), "=&S" (u2) \ | |
| 52 : "0" ((unsigned)(len)/4), "q" (len), "1" (dst),"2" (src) \ | |
| 53 : "memory" ); \ | |
| 54 } while(0) | |
| 55 | |
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56 #define SDL_memcpy4(dst, src, len) \ |
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57 do { \ |
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58 int ecx, edi, esi; \ |
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59 __asm__ __volatile__ ( \ |
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60 "cld\n\t" \ |
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61 "rep ; movsl" \ |
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62 : "=&c" (ecx), "=&D" (edi), "=&S" (esi) \ |
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63 : "0" ((unsigned)(len)), "1" (dst), "2" (src) \ |
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64 : "memory" ); \ |
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65 } while(0) |
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66 |
| 0 | 67 #define SDL_revcpy(dst, src, len) \ |
| 68 do { \ | |
| 69 int u0, u1, u2; \ | |
| 70 char *dstp = (char *)(dst); \ | |
| 71 char *srcp = (char *)(src); \ | |
| 72 int n = (len); \ | |
| 73 if ( n >= 4 ) { \ | |
| 74 __asm__ __volatile__ ( \ | |
| 75 "std\n\t" \ | |
| 76 "rep ; movsl\n\t" \ | |
| 77 : "=&c" (u0), "=&D" (u1), "=&S" (u2) \ | |
| 78 : "0" (n >> 2), \ | |
| 79 "1" (dstp+(n-4)), "2" (srcp+(n-4)) \ | |
| 80 : "memory" ); \ | |
| 81 } \ | |
| 82 switch (n & 3) { \ | |
| 83 case 3: dstp[2] = srcp[2]; \ | |
| 84 case 2: dstp[1] = srcp[1]; \ | |
| 85 case 1: dstp[0] = srcp[0]; \ | |
| 86 break; \ | |
| 87 default: \ | |
| 88 break; \ | |
| 89 } \ | |
| 90 } while(0) | |
| 91 | |
| 92 #define SDL_memmove(dst, src, len) \ | |
| 93 do { \ | |
| 94 if ( (dst) < (src) ) { \ | |
| 95 SDL_memcpy((dst), (src), (len)); \ | |
| 96 } else { \ | |
| 97 SDL_revcpy((dst), (src), (len)); \ | |
| 98 } \ | |
| 99 } while(0) | |
| 100 | |
| 101 #define SDL_memset4(dst, val, len) \ | |
| 102 do { \ | |
| 103 int u0, u1, u2; \ | |
| 104 __asm__ __volatile__ ( \ | |
| 105 "cld\n\t" \ | |
| 106 "rep ; stosl\n\t" \ | |
| 107 : "=&D" (u0), "=&a" (u1), "=&c" (u2) \ | |
| 108 : "0" (dst), "1" (val), "2" ((Uint32)(len)) \ | |
| 109 : "memory" ); \ | |
| 110 } while(0) | |
| 111 | |
| 112 #endif /* GNU C and x86 */ | |
| 113 | |
| 114 /* If there are no optimized versions, define the normal versions */ | |
| 115 #ifndef SDL_memcpy | |
| 116 #define SDL_memcpy(dst, src, len) memcpy(dst, src, len) | |
| 117 #endif | |
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118 |
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119 #ifndef SDL_memcpy4 |
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120 #define SDL_memcpy4(dst, src, len) memcpy(dst, src, (len) << 2) |
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121 #endif |
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122 |
| 0 | 123 #ifndef SDL_revcpy |
| 124 #define SDL_revcpy(dst, src, len) memmove(dst, src, len) | |
| 125 #endif | |
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126 |
| 0 | 127 #ifndef SDL_memset4 |
| 128 #define SDL_memset4(dst, val, len) \ | |
| 129 do { \ | |
| 130 unsigned _count = (len); \ | |
| 131 unsigned _n = (_count + 3) / 4; \ | |
| 132 Uint32 *_p = (Uint32 *)(dst); \ | |
| 133 Uint32 _val = (val); \ | |
| 134 switch (_count % 4) { \ | |
| 135 case 0: do { *_p++ = _val; \ | |
| 136 case 3: *_p++ = _val; \ | |
| 137 case 2: *_p++ = _val; \ | |
| 138 case 1: *_p++ = _val; \ | |
| 139 } while ( --_n ); \ | |
| 140 } \ | |
| 141 } while(0) | |
| 142 #endif | |
| 143 | |
| 144 #endif /* _SDL_memops_h */ |