Mercurial > sdl-ios-xcode

annotate src/audio/SDL_mixer_MMX.c @ 2938:2929ed239d2a

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Adjusted default choice of audio driver. If a driver can definitely see available devices, it is chosen. Otherwise, we'll take the first driver that initializes but saw no devices...this might be because it can't enumerate them, or there really aren't any available. This prevents the dsp driver from hogging control when there are no /dev/dsp* nodes (for example, on a Linux box with ALSA and no OSS emulation).
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 01 Jan 2009 07:54:58 +0000
parents 99210400e8b9
children 4d46850be3f6
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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
d910939febfa Use consistent identifiers for the various platforms we support.
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
d910939febfa Use consistent identifiers for the various platforms we support.
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13 Lesser General Public License for more details.
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14
d910939febfa Use consistent identifiers for the various platforms we support.
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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
e3b3130f3af8 Date: Fri, 31 Dec 2004 04:14:09 +0900
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26 Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr)
e3b3130f3af8 Date: Fri, 31 Dec 2004 04:14:09 +0900
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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
e3b3130f3af8 Date: Fri, 31 Dec 2004 04:14:09 +0900
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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 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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56 " pmulhw %%mm0,%%mm5\n" /* mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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57 " movq %%mm1,%%mm3\n" /* mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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)
539
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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 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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.... */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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102 " punpckhbw %%mm2,%%mm1\n" /* mm1 = 0|a|0|b|0|c|0|d */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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103 " punpcklbw %%mm2,%%mm3\n" /* mm3 = 0|e|0|f|0|g|0|h */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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104 " movq (%0),%%mm2\n" /* mm2 = destination */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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105 " pmullw %%mm0,%%mm1\n" /* mm1 = v*a|v*b|v*c|v*d */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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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parents: 1612
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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 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1612
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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 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1612
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110 " paddsb %%mm2,%%mm3\n" /* add to destination buffer */
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parents: 1612
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111 " movq %%mm3,(%0)\n" /* store back to ram */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1612
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112 " add $8,%0\n"
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parents: 1612
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113 " dec %%edx\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1612
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114 " jnz .mixloopS8\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1612
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115 ".endS8:\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1612
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116 " emms\n"::"r"(dst), "r"(src), "m"(size),
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1612
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117 "m"(volume):"eax", "edx", "memory");
539
a9e38f3b8e4d Added MMX audio mixing code for gcc (thanks Stephane!)
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parents:
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118 }
a9e38f3b8e4d Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
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119 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1612
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120 /* vi: set ts=4 sw=4 expandtab: */