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annotate src/audio/SDL_mixer_MMX_VC.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 e3242177fe4a
children 782fd950bd46 c121d94672cb 328a3f973890
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 #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 SDL_MixAudio_MMX_S16_VC(char* dst,char* src,unsigned int nSize,int volume)
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41 {
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42 __asm
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43 {
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44
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45 push edi
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46 push esi
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47 push ebx
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48
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49 mov edi, dst // edi = dst
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50 mov esi, src // esi = src
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51 mov eax, volume // eax = volume
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52 mov ebx, nSize // ebx = size
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53 shr ebx, 4 // process 16 bytes per iteration = 8 samples
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54 jz endS16
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55
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56 pxor mm0, mm0
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57 movd mm0, eax //%%eax,%%mm0
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58 movq mm1, mm0 //%%mm0,%%mm1
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59 psllq mm0, 16 //$16,%%mm0
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60 por mm0, mm1 //%%mm1,%%mm0
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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 // mm0 = vol|vol|vol|vol
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65
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66 #ifndef __WATCOMC__
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67 align 16
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68 #endif
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69 mixloopS16:
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70 movq mm1, [esi] //(%%esi),%%mm1\n" // mm1 = a|b|c|d
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71 movq mm2, mm1 //%%mm1,%%mm2\n" // mm2 = a|b|c|d
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72 movq mm4, [esi + 8] //8(%%esi),%%mm4\n" // mm4 = e|f|g|h
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73 // pre charger le buffer dst dans mm7
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74 movq mm7, [edi] //(%%edi),%%mm7\n" // mm7 = dst[0]"
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75 // multiplier par le volume
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76 pmullw mm1, mm0 //%%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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77 pmulhw mm2, mm0 //%%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v)
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78 movq mm5, mm4 //%%mm4,%%mm5\n" // mm5 = e|f|g|h
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79 pmullw mm4, mm0 //%%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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80 pmulhw mm5, mm0 //%%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v)
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81 movq mm3, mm1 //%%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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82 punpckhwd mm1, mm2 //%%mm2,%%mm1\n" // mm1 = a*v|b*v
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83 movq mm6, mm4 //%%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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84 punpcklwd mm3, mm2 //%%mm2,%%mm3\n" // mm3 = c*v|d*v
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85 punpckhwd mm4, mm5 //%%mm5,%%mm4\n" // mm4 = e*f|f*v
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86 punpcklwd mm6, mm5 //%%mm5,%%mm6\n" // mm6 = g*v|h*v
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87 // pre charger le buffer dst dans mm5
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88 movq mm5, [edi + 8] //8(%%edi),%%mm5\n" // mm5 = dst[1]
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89 // diviser par 128
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90 psrad mm1, 7 //$7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME
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91 add esi, 16 //$16,%%esi\n"
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92 psrad mm3, 7 //$7,%%mm3\n" // mm3 = c*v/128|d*v/128
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93 psrad mm4, 7 //$7,%%mm4\n" // mm4 = e*v/128|f*v/128
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94 // mm1 = le sample avec le volume modifie
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95 packssdw mm3, mm1 //%%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v)
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96 psrad mm6, 7 //$7,%%mm6\n" // mm6= g*v/128|h*v/128
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97 paddsw mm3, mm7 //%%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst
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98 // mm4 = le sample avec le volume modifie
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99 packssdw mm6, mm4 //%%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v)
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100 movq [edi], mm3 //%%mm3,(%%edi)\n"
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101 paddsw mm6, mm5 //%%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst
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102 movq [edi + 8], mm6 //%%mm6,8(%%edi)\n"
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103 add edi, 16 //$16,%%edi\n"
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104 dec ebx //%%ebx\n"
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105 jnz mixloopS16
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106
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107 ends16:
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108 emms
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109
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110 pop ebx
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111 pop esi
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112 pop edi
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113 }
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114
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115 }
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116
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117 ////////////////////////////////////////////////
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118 // Mixing for 8 bit signed buffers
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119 ////////////////////////////////////////////////
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120
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121 void SDL_MixAudio_MMX_S8_VC(char* dst,char* src,unsigned int nSize,int volume)
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122 {
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123 _asm
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124 {
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125
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126 push edi
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127 push esi
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128 push ebx
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129
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130 mov edi, dst //movl %0,%%edi // edi = dst
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131 mov esi, src //%1,%%esi // esi = src
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132 mov eax, volume //%3,%%eax // eax = volume
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133
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134 movd mm0, eax //%%eax,%%mm0
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135 movq mm1, mm0 //%%mm0,%%mm1
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136 psllq mm0, 16 //$16,%%mm0
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137 por mm0, mm1 //%%mm1,%%mm0
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138 psllq mm0, 16 //$16,%%mm0
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139 por mm0, mm1 //%%mm1,%%mm0
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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
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143 mov ebx, nSize //%2,%%ebx // ebx = size
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144 shr ebx, 3 //$3,%%ebx // process 8 bytes per iteration = 8 samples
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145 cmp ebx, 0 //$0,%%ebx
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146 je endS8
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147
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148 #ifndef __WATCOMC__
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149 align 16
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150 #endif
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151 mixloopS8:
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152 pxor mm2, mm2 //%%mm2,%%mm2 // mm2 = 0
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153 movq mm1, [esi] //(%%esi),%%mm1 // mm1 = a|b|c|d|e|f|g|h
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154 movq mm3, mm1 //%%mm1,%%mm3 // mm3 = a|b|c|d|e|f|g|h
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155 // on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0
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156 pcmpgtb mm2, mm1 //%%mm1,%%mm2 // mm2 = 11111111|00000000|00000000....
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157 punpckhbw mm1, mm2 //%%mm2,%%mm1 // mm1 = 0|a|0|b|0|c|0|d
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158 punpcklbw mm3, mm2 //%%mm2,%%mm3 // mm3 = 0|e|0|f|0|g|0|h
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159 movq mm2, [edi] //(%%edi),%%mm2 // mm2 = destination
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160 pmullw mm1, mm0 //%%mm0,%%mm1 // mm1 = v*a|v*b|v*c|v*d
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161 add esi, 8 //$8,%%esi
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162 pmullw mm3, mm0 //%%mm0,%%mm3 // mm3 = v*e|v*f|v*g|v*h
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163 psraw mm1, 7 //$7,%%mm1 // mm1 = v*a/128|v*b/128|v*c/128|v*d/128
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164 psraw mm3, 7 //$7,%%mm3 // mm3 = v*e/128|v*f/128|v*g/128|v*h/128
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165 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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166 paddsb mm3, mm2 //%%mm2,%%mm3 // add to destination buffer
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167 movq [edi], mm3 //%%mm3,(%%edi) // store back to ram
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168 add edi, 8 //$8,%%edi
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169 dec ebx //%%ebx
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170 jnz mixloopS8
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171
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172 endS8:
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173 emms
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174
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175 pop ebx
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176 pop esi
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177 pop edi
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178 }
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179 }
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180
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d910939febfa Use consistent identifiers for the various platforms we support.
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181 #endif /* SDL_ASSEMBLY_ROUTINES */