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annotate src/audio/SDL_mixer_MMX_VC.c @ 4627:3b5f4b3a69e1

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Documentation updates
author Sam Lantinga <slouken@libsdl.org>
date Thu, 29 Jul 2010 20:24:05 -0700
parents f7b03b6838cb
children b530ef003506
rev   line source
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d910939febfa Use consistent identifiers for the various platforms we support.
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
1402
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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
d910939febfa Use consistent identifiers for the various platforms we support.
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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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24 #include "SDL_mixer_MMX_VC.h"
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25
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26 #if defined(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */
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27 #if ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES)
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28 // MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples
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29 // Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr)
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30 // Converted to Intel ASM notation by Cth
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31 // This code is licensed under the LGPL (see COPYING for details)
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32 //
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33 // Assumes buffer size in bytes is a multiple of 16
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34 // Assumes SDL_MIX_MAXVOLUME = 128
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35
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36
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37 ////////////////////////////////////////////////
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38 // Mixing for 16 bit signed buffers
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39 ////////////////////////////////////////////////
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40
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41 void
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42 SDL_MixAudio_MMX_S16_VC(char *dst, char *src, unsigned int nSize, int volume)
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43 {
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44 /* *INDENT-OFF* */
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45 __asm
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46 {
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47
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48 push edi
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49 push esi
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50 push ebx
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51
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52 mov edi, dst // edi = dst
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53 mov esi, src // esi = src
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54 mov eax, volume // eax = volume
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55 mov ebx, nSize // ebx = size
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56 shr ebx, 4 // process 16 bytes per iteration = 8 samples
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57 jz endS16
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58
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59 pxor mm0, mm0
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60 movd mm0, eax //%%eax,%%mm0
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61 movq mm1, mm0 //%%mm0,%%mm1
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62 psllq mm0, 16 //$16,%%mm0
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63 por mm0, mm1 //%%mm1,%%mm0
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64 psllq mm0, 16 //$16,%%mm0
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65 por mm0, mm1 //%%mm1,%%mm0
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66 psllq mm0, 16 //$16,%%mm0
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67 por mm0, mm1 //%%mm1,%%mm0 // mm0 = vol|vol|vol|vol
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68
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69 #ifndef __WATCOMC__
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70 align 16
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71 #endif
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72 mixloopS16:
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73 movq mm1, [esi] //(%%esi),%%mm1\n" // mm1 = a|b|c|d
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74 movq mm2, mm1 //%%mm1,%%mm2\n" // mm2 = a|b|c|d
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75 movq mm4, [esi + 8] //8(%%esi),%%mm4\n" // mm4 = e|f|g|h
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76 // pre charger le buffer dst dans mm7
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77 movq mm7, [edi] //(%%edi),%%mm7\n" // mm7 = dst[0]"
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78 // multiplier par le volume
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79 pmullw mm1, mm0 //%%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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80 pmulhw mm2, mm0 //%%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v)
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81 movq mm5, mm4 //%%mm4,%%mm5\n" // mm5 = e|f|g|h
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82 pmullw mm4, mm0 //%%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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83 pmulhw mm5, mm0 //%%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v)
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84 movq mm3, mm1 //%%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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85 punpckhwd mm1, mm2 //%%mm2,%%mm1\n" // mm1 = a*v|b*v
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86 movq mm6, mm4 //%%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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87 punpcklwd mm3, mm2 //%%mm2,%%mm3\n" // mm3 = c*v|d*v
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88 punpckhwd mm4, mm5 //%%mm5,%%mm4\n" // mm4 = e*f|f*v
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89 punpcklwd mm6, mm5 //%%mm5,%%mm6\n" // mm6 = g*v|h*v
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90 // pre charger le buffer dst dans mm5
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91 movq mm5, [edi + 8] //8(%%edi),%%mm5\n" // mm5 = dst[1]
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92 // diviser par 128
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93 psrad mm1, 7 //$7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME
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94 add esi, 16 //$16,%%esi\n"
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95 psrad mm3, 7 //$7,%%mm3\n" // mm3 = c*v/128|d*v/128
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96 psrad mm4, 7 //$7,%%mm4\n" // mm4 = e*v/128|f*v/128
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97 // mm1 = le sample avec le volume modifie
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98 packssdw mm3, mm1 //%%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v)
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99 psrad mm6, 7 //$7,%%mm6\n" // mm6= g*v/128|h*v/128
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100 paddsw mm3, mm7 //%%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst
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101 // mm4 = le sample avec le volume modifie
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102 packssdw mm6, mm4 //%%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v)
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103 movq [edi], mm3 //%%mm3,(%%edi)\n"
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104 paddsw mm6, mm5 //%%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst
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105 movq [edi + 8], mm6 //%%mm6,8(%%edi)\n"
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106 add edi, 16 //$16,%%edi\n"
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107 dec ebx //%%ebx\n"
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108 jnz mixloopS16
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109
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110 endS16:
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111 emms
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112
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113 pop ebx
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114 pop esi
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115 pop edi
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116 }
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117 /* *INDENT-ON* */
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118 }
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119
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120 ////////////////////////////////////////////////
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121 // Mixing for 8 bit signed buffers
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122 ////////////////////////////////////////////////
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123
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124 void
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125 SDL_MixAudio_MMX_S8_VC(char *dst, char *src, unsigned int nSize, int volume)
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126 {
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127 /* *INDENT-OFF* */
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128 _asm
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129 {
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130
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131 push edi
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132 push esi
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133 push ebx
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134
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135 mov edi, dst //movl %0,%%edi // edi = dst
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136 mov esi, src //%1,%%esi // esi = src
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137 mov eax, volume //%3,%%eax // eax = volume
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138
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139 movd mm0, eax //%%eax,%%mm0
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140 movq mm1, mm0 //%%mm0,%%mm1
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141 psllq mm0, 16 //$16,%%mm0
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142 por mm0, mm1 //%%mm1,%%mm0
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143 psllq mm0, 16 //$16,%%mm0
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144 por mm0, mm1 //%%mm1,%%mm0
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145 psllq mm0, 16 //$16,%%mm0
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146 por mm0, mm1 //%%mm1,%%mm0
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147
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148 mov ebx, nSize //%2,%%ebx // ebx = size
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149 shr ebx, 3 //$3,%%ebx // process 8 bytes per iteration = 8 samples
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150 cmp ebx, 0 //$0,%%ebx
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151 je endS8
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152
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153 #ifndef __WATCOMC__
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154 align 16
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155 #endif
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156 mixloopS8:
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157 pxor mm2, mm2 //%%mm2,%%mm2 // mm2 = 0
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158 movq mm1, [esi] //(%%esi),%%mm1 // mm1 = a|b|c|d|e|f|g|h
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159 movq mm3, mm1 //%%mm1,%%mm3 // mm3 = a|b|c|d|e|f|g|h
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160 // on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0
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161 pcmpgtb mm2, mm1 //%%mm1,%%mm2 // mm2 = 11111111|00000000|00000000....
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162 punpckhbw mm1, mm2 //%%mm2,%%mm1 // mm1 = 0|a|0|b|0|c|0|d
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163 punpcklbw mm3, mm2 //%%mm2,%%mm3 // mm3 = 0|e|0|f|0|g|0|h
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164 movq mm2, [edi] //(%%edi),%%mm2 // mm2 = destination
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165 pmullw mm1, mm0 //%%mm0,%%mm1 // mm1 = v*a|v*b|v*c|v*d
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166 add esi, 8 //$8,%%esi
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167 pmullw mm3, mm0 //%%mm0,%%mm3 // mm3 = v*e|v*f|v*g|v*h
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168 psraw mm1, 7 //$7,%%mm1 // mm1 = v*a/128|v*b/128|v*c/128|v*d/128
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169 psraw mm3, 7 //$7,%%mm3 // mm3 = v*e/128|v*f/128|v*g/128|v*h/128
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170 packsswb mm3, mm1 //%%mm1,%%mm3 // 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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171 paddsb mm3, mm2 //%%mm2,%%mm3 // add to destination buffer
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172 movq [edi], mm3 //%%mm3,(%%edi) // store back to ram
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173 add edi, 8 //$8,%%edi
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174 dec ebx //%%ebx
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175 jnz mixloopS8
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176
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177 endS8:
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178 emms
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179
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180 pop ebx
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181 pop esi
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182 pop edi
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183 }
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184 /* *INDENT-ON* */
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185 }
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186
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187 #endif /* SDL_ASSEMBLY_ROUTINES */
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188 #endif /* SDL_BUGGY_MMX_MIXERS */
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189
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190 /* vi: set ts=4 sw=4 expandtab: */