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annotate src/audio/SDL_mixer_MMX.c @ 1675:d33dcfc3fde7 SDL-1.3

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Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Jun 2006 07:30:16 +0000
parents 4da1ee79c9af
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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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e3b3130f3af8 Date: Fri, 31 Dec 2004 04:14:09 +0900
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24 /*
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25 MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples
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26 Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr)
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27 This code is licensed under the LGPL (see COPYING for details)
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28
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29 Assumes buffer size in bytes is a multiple of 16
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30 Assumes SDL_MIX_MAXVOLUME = 128
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31 */
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32
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33
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34 /***********************************************
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35 * Mixing for 16 bit signed buffers
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36 ***********************************************/
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37
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38 #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES)
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39 void
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40 SDL_MixAudio_MMX_S16(char *dst, char *src, unsigned int size, int volume)
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41 {
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42 __asm__ __volatile__(" movl %3,%%eax\n" /* eax = volume */
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43 " movl %2,%%edx\n" /* edx = size */
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44 " shrl $4,%%edx\n" /* process 16 bytes per iteration = 8 samples */
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45 " jz .endS16\n" " pxor %%mm0,%%mm0\n" " movd %%eax,%%mm0\n" " movq %%mm0,%%mm1\n" " psllq $16,%%mm0\n" " por %%mm1,%%mm0\n" " psllq $16,%%mm0\n" " por %%mm1,%%mm0\n" " psllq $16,%%mm0\n" " por %%mm1,%%mm0\n" /* mm0 = vol|vol|vol|vol */
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46 ".align 8\n" " .mixloopS16:\n" " movq (%1),%%mm1\n" /* mm1 = a|b|c|d */
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47 " movq %%mm1,%%mm2\n" /* mm2 = a|b|c|d */
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48 " movq 8(%1),%%mm4\n" /* mm4 = e|f|g|h */
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49 /* pré charger le buffer dst dans mm7 */
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50 " movq (%0),%%mm7\n" /* mm7 = dst[0] */
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51 /* multiplier par le volume */
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52 " pmullw %%mm0,%%mm1\n" /* mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */
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53 " pmulhw %%mm0,%%mm2\n" /* mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v) */
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54 " movq %%mm4,%%mm5\n" /* mm5 = e|f|g|h */
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55 " pmullw %%mm0,%%mm4\n" /* mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */
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56 " pmulhw %%mm0,%%mm5\n" /* mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v) */
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57 " movq %%mm1,%%mm3\n" /* mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */
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58 " punpckhwd %%mm2,%%mm1\n" /* mm1 = a*v|b*v */
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59 " movq %%mm4,%%mm6\n" /* mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */
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60 " punpcklwd %%mm2,%%mm3\n" /* mm3 = c*v|d*v */
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61 " punpckhwd %%mm5,%%mm4\n" /* mm4 = e*f|f*v */
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62 " punpcklwd %%mm5,%%mm6\n" /* mm6 = g*v|h*v */
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63 /* pré charger le buffer dst dans mm5 */
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64 " movq 8(%0),%%mm5\n" /* mm5 = dst[1] */
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65 /* diviser par 128 */
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66 " psrad $7,%%mm1\n" /* mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME */
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67 " add $16,%1\n" " psrad $7,%%mm3\n" /* mm3 = c*v/128|d*v/128 */
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68 " psrad $7,%%mm4\n" /* mm4 = e*v/128|f*v/128 */
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69 /* mm1 = le sample avec le volume modifié */
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70 " packssdw %%mm1,%%mm3\n" /* mm3 = s(a*v|b*v|c*v|d*v) */
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71 " psrad $7,%%mm6\n" /* mm6= g*v/128|h*v/128 */
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72 " paddsw %%mm7,%%mm3\n" /* mm3 = adjust_volume(src)+dst */
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73 /* mm4 = le sample avec le volume modifié */
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74 " packssdw %%mm4,%%mm6\n" /* mm6 = s(e*v|f*v|g*v|h*v) */
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75 " movq %%mm3,(%0)\n" " paddsw %%mm5,%%mm6\n" /* mm6 = adjust_volume(src)+dst */
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76 " movq %%mm6,8(%0)\n"
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77 " add $16,%0\n"
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78 " dec %%edx\n"
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79 " jnz .mixloopS16\n"
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80 " emms\n"
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81 ".endS16:\n"::"r"(dst), "r"(src),
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82 "m"(size), "m"(volume):"eax", "edx", "memory");
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83 }
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84
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85
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86
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87 /*////////////////////////////////////////////// */
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88 /* Mixing for 8 bit signed buffers */
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89 /*////////////////////////////////////////////// */
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90
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91 void
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92 SDL_MixAudio_MMX_S8(char *dst, char *src, unsigned int size, int volume)
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93 {
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94 __asm__ __volatile__(" movl %3,%%eax\n" /* eax = volume */
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95 " movd %%eax,%%mm0\n" " movq %%mm0,%%mm1\n" " psllq $16,%%mm0\n" " por %%mm1,%%mm0\n" " psllq $16,%%mm0\n" " por %%mm1,%%mm0\n" " psllq $16,%%mm0\n" " por %%mm1,%%mm0\n" " movl %2,%%edx\n" /* edx = size */
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96 " shr $3,%%edx\n" /* process 8 bytes per iteration = 8 samples */
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97 " cmp $0,%%edx\n" " je .endS8\n" ".align 8\n" " .mixloopS8:\n" " pxor %%mm2,%%mm2\n" /* mm2 = 0 */
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98 " movq (%1),%%mm1\n" /* mm1 = a|b|c|d|e|f|g|h */
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99 " movq %%mm1,%%mm3\n" /* mm3 = a|b|c|d|e|f|g|h */
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100 /* on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0 */
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101 " pcmpgtb %%mm1,%%mm2\n" /* mm2 = 11111111|00000000|00000000.... */
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102 " punpckhbw %%mm2,%%mm1\n" /* mm1 = 0|a|0|b|0|c|0|d */
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103 " punpcklbw %%mm2,%%mm3\n" /* mm3 = 0|e|0|f|0|g|0|h */
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104 " movq (%0),%%mm2\n" /* mm2 = destination */
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105 " pmullw %%mm0,%%mm1\n" /* mm1 = v*a|v*b|v*c|v*d */
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106 " add $8,%1\n" " pmullw %%mm0,%%mm3\n" /* mm3 = v*e|v*f|v*g|v*h */
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107 " psraw $7,%%mm1\n" /* mm1 = v*a/128|v*b/128|v*c/128|v*d/128 */
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108 " psraw $7,%%mm3\n" /* mm3 = v*e/128|v*f/128|v*g/128|v*h/128 */
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109 " packsswb %%mm1,%%mm3\n" /* mm1 = v*a/128|v*b/128|v*c/128|v*d/128|v*e/128|v*f/128|v*g/128|v*h/128 */
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110 " paddsb %%mm2,%%mm3\n" /* add to destination buffer */
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111 " movq %%mm3,(%0)\n" /* store back to ram */
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112 " add $8,%0\n"
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113 " dec %%edx\n"
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114 " jnz .mixloopS8\n"
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115 ".endS8:\n"
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116 " emms\n"::"r"(dst), "r"(src), "m"(size),
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diff changeset
117 "m"(volume):"eax", "edx", "memory");
539
a9e38f3b8e4d Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
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118 }
a9e38f3b8e4d Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
119 #endif
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1612
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120 /* vi: set ts=4 sw=4 expandtab: */