Mercurial > sdl-ios-xcode
annotate src/video/SDL_memops.h @ 1240:3b8a43c428bb
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 | b8d311d90021 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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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 */ |