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annotate src/audio/SDL_mixer_MMX_VC.c @ 2866:e532417a6977

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Fixed SDL 1.2 compatibility problem. The API specifies that SDL_OpenAudio() will fill out the 'desired' audio spec with the correct samples and size set by the driver. This value is important since it may be used by applications that size audio buffers, etc. However, we want to allow advanced applications to call SDL_OpenAudioDevice() which gets passed a const 'desired' parameter, and have the correct data filled into the 'obtained' parameter, possibly allowing or not allowing format changes. So... 'obtained' becomes the audio format the user callback is expected to use, and we add flags to allow the application to specify which format changes are allowed. Note: We really need to add a way to query the 'obtained' audio spec.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 13 Dec 2008 06:36:47 +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
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
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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 #include "SDL_mixer_MMX_VC.h"
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25
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26 #if ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES)
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27 // MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples
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28 // Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr)
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29 // Converted to Intel ASM notation by Cth
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30 // This code is licensed under the LGPL (see COPYING for details)
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31 //
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32 // Assumes buffer size in bytes is a multiple of 16
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33 // Assumes SDL_MIX_MAXVOLUME = 128
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34
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35
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36 ////////////////////////////////////////////////
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37 // Mixing for 16 bit signed buffers
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38 ////////////////////////////////////////////////
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39
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40 void
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41 SDL_MixAudio_MMX_S16_VC(char *dst, char *src, unsigned int nSize, int volume)
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42 {
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43 /* *INDENT-OFF* */
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44 __asm
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45 {
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46
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47 push edi
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48 push esi
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49 push ebx
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50
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51 mov edi, dst // edi = dst
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52 mov esi, src // esi = src
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53 mov eax, volume // eax = volume
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54 mov ebx, nSize // ebx = size
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55 shr ebx, 4 // process 16 bytes per iteration = 8 samples
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56 jz endS16
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57
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58 pxor mm0, mm0
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59 movd mm0, eax //%%eax,%%mm0
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60 movq mm1, mm0 //%%mm0,%%mm1
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61 psllq mm0, 16 //$16,%%mm0
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62 por mm0, mm1 //%%mm1,%%mm0
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63 psllq mm0, 16 //$16,%%mm0
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64 por mm0, mm1 //%%mm1,%%mm0
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65 psllq mm0, 16 //$16,%%mm0
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66 por mm0, mm1 //%%mm1,%%mm0 // mm0 = vol|vol|vol|vol
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67
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68 #ifndef __WATCOMC__
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69 align 16
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70 #endif
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71 mixloopS16:
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72 movq mm1, [esi] //(%%esi),%%mm1\n" // mm1 = a|b|c|d
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73 movq mm2, mm1 //%%mm1,%%mm2\n" // mm2 = a|b|c|d
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74 movq mm4, [esi + 8] //8(%%esi),%%mm4\n" // mm4 = e|f|g|h
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75 // pre charger le buffer dst dans mm7
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76 movq mm7, [edi] //(%%edi),%%mm7\n" // mm7 = dst[0]"
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77 // multiplier par le volume
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78 pmullw mm1, mm0 //%%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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79 pmulhw mm2, mm0 //%%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v)
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80 movq mm5, mm4 //%%mm4,%%mm5\n" // mm5 = e|f|g|h
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81 pmullw mm4, mm0 //%%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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82 pmulhw mm5, mm0 //%%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v)
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83 movq mm3, mm1 //%%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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84 punpckhwd mm1, mm2 //%%mm2,%%mm1\n" // mm1 = a*v|b*v
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85 movq mm6, mm4 //%%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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86 punpcklwd mm3, mm2 //%%mm2,%%mm3\n" // mm3 = c*v|d*v
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87 punpckhwd mm4, mm5 //%%mm5,%%mm4\n" // mm4 = e*f|f*v
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88 punpcklwd mm6, mm5 //%%mm5,%%mm6\n" // mm6 = g*v|h*v
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89 // pre charger le buffer dst dans mm5
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90 movq mm5, [edi + 8] //8(%%edi),%%mm5\n" // mm5 = dst[1]
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91 // diviser par 128
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92 psrad mm1, 7 //$7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME
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93 add esi, 16 //$16,%%esi\n"
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94 psrad mm3, 7 //$7,%%mm3\n" // mm3 = c*v/128|d*v/128
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95 psrad mm4, 7 //$7,%%mm4\n" // mm4 = e*v/128|f*v/128
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96 // mm1 = le sample avec le volume modifie
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97 packssdw mm3, mm1 //%%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v)
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98 psrad mm6, 7 //$7,%%mm6\n" // mm6= g*v/128|h*v/128
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99 paddsw mm3, mm7 //%%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst
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100 // mm4 = le sample avec le volume modifie
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101 packssdw mm6, mm4 //%%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v)
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102 movq [edi], mm3 //%%mm3,(%%edi)\n"
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103 paddsw mm6, mm5 //%%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst
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104 movq [edi + 8], mm6 //%%mm6,8(%%edi)\n"
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105 add edi, 16 //$16,%%edi\n"
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106 dec ebx //%%ebx\n"
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107 jnz mixloopS16
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108
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109 endS16:
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110 emms
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111
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112 pop ebx
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113 pop esi
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114 pop edi
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115 }
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116 /* *INDENT-ON* */
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117 }
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118
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119 ////////////////////////////////////////////////
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120 // Mixing for 8 bit signed buffers
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121 ////////////////////////////////////////////////
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122
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123 void
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124 SDL_MixAudio_MMX_S8_VC(char *dst, char *src, unsigned int nSize, int volume)
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125 {
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126 /* *INDENT-OFF* */
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127 _asm
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128 {
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129
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130 push edi
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131 push esi
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132 push ebx
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133
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134 mov edi, dst //movl %0,%%edi // edi = dst
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135 mov esi, src //%1,%%esi // esi = src
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136 mov eax, volume //%3,%%eax // eax = volume
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137
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138 movd mm0, eax //%%eax,%%mm0
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139 movq mm1, mm0 //%%mm0,%%mm1
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140 psllq mm0, 16 //$16,%%mm0
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141 por mm0, mm1 //%%mm1,%%mm0
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142 psllq mm0, 16 //$16,%%mm0
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143 por mm0, mm1 //%%mm1,%%mm0
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144 psllq mm0, 16 //$16,%%mm0
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145 por mm0, mm1 //%%mm1,%%mm0
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146
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147 mov ebx, nSize //%2,%%ebx // ebx = size
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148 shr ebx, 3 //$3,%%ebx // process 8 bytes per iteration = 8 samples
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149 cmp ebx, 0 //$0,%%ebx
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150 je endS8
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151
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152 #ifndef __WATCOMC__
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153 align 16
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154 #endif
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155 mixloopS8:
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156 pxor mm2, mm2 //%%mm2,%%mm2 // mm2 = 0
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157 movq mm1, [esi] //(%%esi),%%mm1 // mm1 = a|b|c|d|e|f|g|h
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158 movq mm3, mm1 //%%mm1,%%mm3 // mm3 = a|b|c|d|e|f|g|h
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159 // on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0
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160 pcmpgtb mm2, mm1 //%%mm1,%%mm2 // mm2 = 11111111|00000000|00000000....
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161 punpckhbw mm1, mm2 //%%mm2,%%mm1 // mm1 = 0|a|0|b|0|c|0|d
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162 punpcklbw mm3, mm2 //%%mm2,%%mm3 // mm3 = 0|e|0|f|0|g|0|h
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163 movq mm2, [edi] //(%%edi),%%mm2 // mm2 = destination
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164 pmullw mm1, mm0 //%%mm0,%%mm1 // mm1 = v*a|v*b|v*c|v*d
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165 add esi, 8 //$8,%%esi
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166 pmullw mm3, mm0 //%%mm0,%%mm3 // mm3 = v*e|v*f|v*g|v*h
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167 psraw mm1, 7 //$7,%%mm1 // mm1 = v*a/128|v*b/128|v*c/128|v*d/128
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168 psraw mm3, 7 //$7,%%mm3 // mm3 = v*e/128|v*f/128|v*g/128|v*h/128
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169 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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170 paddsb mm3, mm2 //%%mm2,%%mm3 // add to destination buffer
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171 movq [edi], mm3 //%%mm3,(%%edi) // store back to ram
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172 add edi, 8 //$8,%%edi
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173 dec ebx //%%ebx
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174 jnz mixloopS8
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175
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176 endS8:
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177 emms
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178
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179 pop ebx
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180 pop esi
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181 pop edi
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182 }
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183 /* *INDENT-ON* */
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184 }
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185
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186 #endif /* SDL_ASSEMBLY_ROUTINES */
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188 /* vi: set ts=4 sw=4 expandtab: */