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annotate src/audio/SDL_mixer_MMX.c @ 1668:4da1ee79c9af SDL-1.3

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more tweaking indent options
author Sam Lantinga <slouken@libsdl.org>
date Mon, 29 May 2006 04:04:35 +0000
parents 782fd950bd46
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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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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117 "m"(volume):"eax", "edx", "memory");
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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: */