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annotate src/audio/SDL_mixer_MMX_VC.c @ 5006:8e8876e4aec6

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Include windows.h in SDL_atomic.h by default, but don't include the atomic API in SDL.h This allows all SDL code to take advantage of the atomic intrinsics on Windows, but doesn't cause applications just including SDL.h to pull in windows.h
author Sam Lantinga <slouken@libsdl.org>
date Sun, 16 Jan 2011 17:45:42 -0800
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
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4
d910939febfa Use consistent identifiers for the various platforms we support.
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5 This library is free software; you can redistribute it and/or
d910939febfa Use consistent identifiers for the various platforms we support.
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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
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
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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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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190 /* vi: set ts=4 sw=4 expandtab: */