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annotate src/audio/SDL_mixer_MMX.c @ 4396:f5d3f7fa071d SDL-1.2

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1.2 pulseaudio: make some function pointers static.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 17 Jan 2010 05:17:59 +0000
parents a8e5b518e194
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) 1997-2009 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
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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
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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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(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */
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39 #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES)
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40 void 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__ (
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43
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44 " movl %3,%%eax\n" /* eax = volume */
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45
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46 " movl %2,%%edx\n" /* edx = size */
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47
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48 " shrl $4,%%edx\n" /* process 16 bytes per iteration = 8 samples */
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49
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50 " jz .endS16\n"
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51
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52 " pxor %%mm0,%%mm0\n"
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53
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54 " movd %%eax,%%mm0\n"
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55 " movq %%mm0,%%mm1\n"
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56 " psllq $16,%%mm0\n"
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57 " por %%mm1,%%mm0\n"
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58 " psllq $16,%%mm0\n"
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59 " por %%mm1,%%mm0\n"
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60 " psllq $16,%%mm0\n"
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61 " por %%mm1,%%mm0\n" /* mm0 = vol|vol|vol|vol */
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62
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63 ".align 8\n"
539
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64 " .mixloopS16:\n"
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65
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66 " movq (%1),%%mm1\n" /* mm1 = a|b|c|d */
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67
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68 " movq %%mm1,%%mm2\n" /* mm2 = a|b|c|d */
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69
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70 " movq 8(%1),%%mm4\n" /* mm4 = e|f|g|h */
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72 /* pré charger le buffer dst dans mm7 */
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73 " movq (%0),%%mm7\n" /* mm7 = dst[0] */
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75 /* multiplier par le volume */
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76 " pmullw %%mm0,%%mm1\n" /* mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */
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78 " pmulhw %%mm0,%%mm2\n" /* mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v) */
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79 " movq %%mm4,%%mm5\n" /* mm5 = e|f|g|h */
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81 " pmullw %%mm0,%%mm4\n" /* mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */
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83 " pmulhw %%mm0,%%mm5\n" /* mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v) */
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84 " movq %%mm1,%%mm3\n" /* mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */
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86 " punpckhwd %%mm2,%%mm1\n" /* mm1 = a*v|b*v */
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88 " movq %%mm4,%%mm6\n" /* mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */
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89 " punpcklwd %%mm2,%%mm3\n" /* mm3 = c*v|d*v */
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91 " punpckhwd %%mm5,%%mm4\n" /* mm4 = e*f|f*v */
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93 " punpcklwd %%mm5,%%mm6\n" /* mm6 = g*v|h*v */
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95 /* pré charger le buffer dst dans mm5 */
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96 " movq 8(%0),%%mm5\n" /* mm5 = dst[1] */
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98 /* diviser par 128 */
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99 " psrad $7,%%mm1\n" /* mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME */
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100 " add $16,%1\n"
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102 " psrad $7,%%mm3\n" /* mm3 = c*v/128|d*v/128 */
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104 " psrad $7,%%mm4\n" /* mm4 = e*v/128|f*v/128 */
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106 /* mm1 = le sample avec le volume modifié */
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107 " packssdw %%mm1,%%mm3\n" /* mm3 = s(a*v|b*v|c*v|d*v) */
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109 " psrad $7,%%mm6\n" /* mm6= g*v/128|h*v/128 */
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110 " paddsw %%mm7,%%mm3\n" /* mm3 = adjust_volume(src)+dst */
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112 /* mm4 = le sample avec le volume modifié */
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113 " packssdw %%mm4,%%mm6\n" /* mm6 = s(e*v|f*v|g*v|h*v) */
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114 " movq %%mm3,(%0)\n"
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116 " paddsw %%mm5,%%mm6\n" /* mm6 = adjust_volume(src)+dst */
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118 " movq %%mm6,8(%0)\n"
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120 " add $16,%0\n"
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122 " dec %%edx\n"
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123
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124 " jnz .mixloopS16\n"
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125
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126 " emms\n"
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127
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128 ".endS16:\n"
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129 :
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130 : "r" (dst), "r"(src),"m"(size),
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131 "m"(volume)
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132 : "eax","edx","memory"
539
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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 /*////////////////////////////////////////////// */
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139 /* Mixing for 8 bit signed buffers */
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140 /*////////////////////////////////////////////// */
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141
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142 void SDL_MixAudio_MMX_S8(char* dst,char* src,unsigned int size,int volume)
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143 {
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144 __asm__ __volatile__ (
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145
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146 " movl %3,%%eax\n" /* eax = volume */
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147
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b580f7201543 From: "Alex Volkov" <avcp-sdlmail@usa.net>
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148 " movd %%eax,%%mm0\n"
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149 " movq %%mm0,%%mm1\n"
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150 " psllq $16,%%mm0\n"
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151 " por %%mm1,%%mm0\n"
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152 " psllq $16,%%mm0\n"
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153 " por %%mm1,%%mm0\n"
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154 " psllq $16,%%mm0\n"
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155 " por %%mm1,%%mm0\n"
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156
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157 " movl %2,%%edx\n" /* edx = size */
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158 " shr $3,%%edx\n" /* process 8 bytes per iteration = 8 samples */
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159
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160 " cmp $0,%%edx\n"
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161 " je .endS8\n"
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162
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163 ".align 8\n"
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164 " .mixloopS8:\n"
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165
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166 " pxor %%mm2,%%mm2\n" /* mm2 = 0 */
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167 " movq (%1),%%mm1\n" /* mm1 = a|b|c|d|e|f|g|h */
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168
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169 " movq %%mm1,%%mm3\n" /* mm3 = a|b|c|d|e|f|g|h */
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170
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171 /* on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0 */
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172 " pcmpgtb %%mm1,%%mm2\n" /* mm2 = 11111111|00000000|00000000.... */
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173
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174 " punpckhbw %%mm2,%%mm1\n" /* mm1 = 0|a|0|b|0|c|0|d */
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175
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176 " punpcklbw %%mm2,%%mm3\n" /* mm3 = 0|e|0|f|0|g|0|h */
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177 " movq (%0),%%mm2\n" /* mm2 = destination */
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178
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179 " pmullw %%mm0,%%mm1\n" /* mm1 = v*a|v*b|v*c|v*d */
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180 " add $8,%1\n"
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181
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182 " pmullw %%mm0,%%mm3\n" /* mm3 = v*e|v*f|v*g|v*h */
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183 " psraw $7,%%mm1\n" /* mm1 = v*a/128|v*b/128|v*c/128|v*d/128 */
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184
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185 " psraw $7,%%mm3\n" /* mm3 = v*e/128|v*f/128|v*g/128|v*h/128 */
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186
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187 " 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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188
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189 " paddsb %%mm2,%%mm3\n" /* add to destination buffer */
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190
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191 " movq %%mm3,(%0)\n" /* store back to ram */
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192 " add $8,%0\n"
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193
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194 " dec %%edx\n"
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195
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196 " jnz .mixloopS8\n"
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197
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198 ".endS8:\n"
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199 " emms\n"
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200 :
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201 : "r" (dst), "r"(src),"m"(size),
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202 "m"(volume)
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203 : "eax","edx","memory"
539
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204 );
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205 }
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206 #endif
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207 #endif