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annotate src/audio/SDL_mixer_MMX.c @ 1561:c724c4a99759

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Try to fill the hardware audio buffer immediately. Fixes Bugzilla #18.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 21 Mar 2006 00:56:10 +0000
parents efb34e597d21
children 97d0966f4bf7
rev   line source
1402
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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
1402
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38 #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES)
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39 void SDL_MixAudio_MMX_S16(char* dst,char* src,unsigned int size,int volume)
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40 {
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41 __asm__ __volatile__ (
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42
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43 " movl %3,%%eax\n" // eax = volume
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44
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45 " movl %2,%%edx\n" // edx = size
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46
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47 " shrl $4,%%edx\n" // process 16 bytes per iteration = 8 samples
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48
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49 " jz .endS16\n"
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50
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51 " pxor %%mm0,%%mm0\n"
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52
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53 " movd %%eax,%%mm0\n"
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54 " movq %%mm0,%%mm1\n"
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55 " psllq $16,%%mm0\n"
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56 " por %%mm1,%%mm0\n"
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57 " psllq $16,%%mm0\n"
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58 " por %%mm1,%%mm0\n"
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59 " psllq $16,%%mm0\n"
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60 " por %%mm1,%%mm0\n" // mm0 = vol|vol|vol|vol
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61
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62 ".align 8\n"
539
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63 " .mixloopS16:\n"
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64
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65 " movq (%1),%%mm1\n" // mm1 = a|b|c|d
539
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66
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67 " movq %%mm1,%%mm2\n" // mm2 = a|b|c|d
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68
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69 " movq 8(%1),%%mm4\n" // mm4 = e|f|g|h
539
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70
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71 // pré charger le buffer dst dans mm7
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72 " movq (%0),%%mm7\n" // mm7 = dst[0]"
539
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73
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74 // multiplier par le volume
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75 " pmullw %%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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76
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77 " pmulhw %%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v)
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78 " movq %%mm4,%%mm5\n" // mm5 = e|f|g|h
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79
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80 " pmullw %%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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81
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82 " pmulhw %%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v)
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83 " movq %%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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84
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85 " punpckhwd %%mm2,%%mm1\n" // mm1 = a*v|b*v
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86
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87 " movq %%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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88 " punpcklwd %%mm2,%%mm3\n" // mm3 = c*v|d*v
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89
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90 " punpckhwd %%mm5,%%mm4\n" // mm4 = e*f|f*v
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91
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92 " punpcklwd %%mm5,%%mm6\n" // mm6 = g*v|h*v
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93
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94 // pré charger le buffer dst dans mm5
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95 " movq 8(%0),%%mm5\n" // mm5 = dst[1]
539
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96
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97 // diviser par 128
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98 " psrad $7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME
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99 " add $16,%1\n"
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100
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101 " psrad $7,%%mm3\n" // mm3 = c*v/128|d*v/128
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102
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103 " psrad $7,%%mm4\n" // mm4 = e*v/128|f*v/128
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104
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105 // mm1 = le sample avec le volume modifié
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106 " packssdw %%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v)
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107
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108 " psrad $7,%%mm6\n" // mm6= g*v/128|h*v/128
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109 " paddsw %%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst
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110
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111 // mm4 = le sample avec le volume modifié
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112 " packssdw %%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v)
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113 " movq %%mm3,(%0)\n"
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114
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115 " paddsw %%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst
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117 " movq %%mm6,8(%0)\n"
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119 " add $16,%0\n"
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121 " dec %%edx\n"
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122
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123 " jnz .mixloopS16\n"
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124
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125 " emms\n"
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126
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127 ".endS16:\n"
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128 :
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129 : "r" (dst), "r"(src),"m"(size),
539
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130 "m"(volume)
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131 : "eax","edx","memory"
539
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132 );
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133 }
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134
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135
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136
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137 ////////////////////////////////////////////////
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138 // Mixing for 8 bit signed buffers
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139 ////////////////////////////////////////////////
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140
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141 void SDL_MixAudio_MMX_S8(char* dst,char* src,unsigned int size,int volume)
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142 {
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143 __asm__ __volatile__ (
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144
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145 " movl %3,%%eax\n" // eax = volume
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146
1147
b580f7201543 From: "Alex Volkov" <avcp-sdlmail@usa.net>
Ryan C. Gordon <icculus@icculus.org>
parents: 1019
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147 " movd %%eax,%%mm0\n"
539
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148 " movq %%mm0,%%mm1\n"
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149 " psllq $16,%%mm0\n"
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150 " por %%mm1,%%mm0\n"
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151 " psllq $16,%%mm0\n"
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152 " por %%mm1,%%mm0\n"
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153 " psllq $16,%%mm0\n"
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154 " por %%mm1,%%mm0\n"
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155
887
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156 " movl %2,%%edx\n" // edx = size
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157 " shr $3,%%edx\n" // process 8 bytes per iteration = 8 samples
539
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158
887
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159 " cmp $0,%%edx\n"
539
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160 " je .endS8\n"
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161
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efb34e597d21 Fixed assembly alignment error on Intel Macs.
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162 ".align 8\n"
539
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163 " .mixloopS8:\n"
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164
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165 " pxor %%mm2,%%mm2\n" // mm2 = 0
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166 " movq (%1),%%mm1\n" // mm1 = a|b|c|d|e|f|g|h
539
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167
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168 " movq %%mm1,%%mm3\n" // mm3 = a|b|c|d|e|f|g|h
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169
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170 // on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0
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171 " pcmpgtb %%mm1,%%mm2\n" // mm2 = 11111111|00000000|00000000....
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172
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173 " punpckhbw %%mm2,%%mm1\n" // mm1 = 0|a|0|b|0|c|0|d
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174
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175 " punpcklbw %%mm2,%%mm3\n" // mm3 = 0|e|0|f|0|g|0|h
887
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176 " movq (%0),%%mm2\n" // mm2 = destination
539
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177
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178 " pmullw %%mm0,%%mm1\n" // mm1 = v*a|v*b|v*c|v*d
887
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179 " add $8,%1\n"
539
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180
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181 " pmullw %%mm0,%%mm3\n" // mm3 = v*e|v*f|v*g|v*h
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182 " psraw $7,%%mm1\n" // mm1 = v*a/128|v*b/128|v*c/128|v*d/128
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183
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184 " psraw $7,%%mm3\n" // mm3 = v*e/128|v*f/128|v*g/128|v*h/128
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185
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186 " 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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187
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188 " paddsb %%mm2,%%mm3\n" // add to destination buffer
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189
887
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190 " movq %%mm3,(%0)\n" // store back to ram
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191 " add $8,%0\n"
539
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192
887
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193 " dec %%edx\n"
539
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194
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195 " jnz .mixloopS8\n"
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196
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197 ".endS8:\n"
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198 " emms\n"
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Sam Lantinga <slouken@libsdl.org>
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199 :
887
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200 : "r" (dst), "r"(src),"m"(size),
539
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201 "m"(volume)
887
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202 : "eax","edx","memory"
539
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203 );
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204 }
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205 #endif
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206