Mercurial > sdl-ios-xcode

annotate src/audio/SDL_mixer_MMX.c @ 4001:6831b8723a85 SDL-1.2

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Don't initialize the audio buffer passed to the application's audio callback, since they are expected to entirely fill it with data or silence. For legacy apps that might expect the buffer to already have silence and thus may not fill the buffer in the callback, there's an environment variable to expose the old behaviour. Fixes Bugzilla #416.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 05 Jul 2007 02:24:36 +0000
parents 97d0966f4bf7
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
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
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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 */
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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 */
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71 /* pré charger le buffer dst dans mm7 */
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72 " movq (%0),%%mm7\n" /* mm7 = dst[0] */
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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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80 " pmullw %%mm0,%%mm4\n" /* mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */
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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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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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90 " punpckhwd %%mm5,%%mm4\n" /* mm4 = e*f|f*v */
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92 " punpcklwd %%mm5,%%mm6\n" /* mm6 = g*v|h*v */
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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] */
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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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101 " psrad $7,%%mm3\n" /* mm3 = c*v/128|d*v/128 */
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103 " psrad $7,%%mm4\n" /* mm4 = e*v/128|f*v/128 */
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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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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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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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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),
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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>
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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
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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 */
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158
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159 " cmp $0,%%edx\n"
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160 " je .endS8\n"
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161
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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 */
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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 */
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176 " movq (%0),%%mm2\n" /* mm2 = destination */
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177
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178 " pmullw %%mm0,%%mm1\n" /* mm1 = v*a|v*b|v*c|v*d */
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179 " add $8,%1\n"
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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 */
539
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187
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188 " paddsb %%mm2,%%mm3\n" /* add to destination buffer */
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189
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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
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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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199 :
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200 : "r" (dst), "r"(src),"m"(size),
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201 "m"(volume)
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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