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annotate src/audio/SDL_mixer_MMX_VC.c @ 610:95433459fbd2

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Date: Mon, 14 Apr 2003 22:08:27 +0100 From: Patrice Mandin Subject: [SDL][PATCH] 2 patches for sdl Here are 2 patches for SDL: - One is to put the dummy video drivers at the end of the video drivers list. It gave me problems, when SDL_VIDEODRIVER is not set, and the dummy driver is used instead of the platform's driver, just because it is always available. So the dummy driver must always be at the end of the list. I suppose picogui and dc video drivers also don't work.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 15 Apr 2003 15:46:56 +0000
parents 64fe373be3dc
children 72ef7ce609ef
rev   line source
574
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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1 // MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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2 // Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr)
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3 // Converted to Intel ASM notation by Cth
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4 // This code is licensed under the LGPL (see COPYING for details)
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5 //
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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6 // Assumes buffer size in bytes is a multiple of 16
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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7 // Assumes SDL_MIX_MAXVOLUME = 128
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8
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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9
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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10 ////////////////////////////////////////////////
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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11 // Mixing for 16 bit signed buffers
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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12 ////////////////////////////////////////////////
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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13
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14 #if defined(USE_ASM_MIXER_VC)
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15 #include <windows.h>
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16 #include <stdio.h>
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17
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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18 void SDL_MixAudio_MMX_S16_VC(char* dst,char* src,unsigned int nSize,int volume)
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19 {
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20 __asm
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21 {
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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22 align 16
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23
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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24 push edi
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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25 push esi
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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26 push ebx
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27
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28 mov edi, dst // edi = dst
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29 mov esi, src // esi = src
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30 mov eax, volume // eax = volume
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31 mov ebx, nSize // ebx = size
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32 shr ebx, 4 // process 16 bytes per iteration = 8 samples
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33 jz endS16
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34
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35 pxor mm0, mm0
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36 movd mm0, eax //%%eax,%%mm0
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37 movq mm1, mm0 //%%mm0,%%mm1
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38 psllq mm0, 16 //$16,%%mm0
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39 por mm0, mm1 //%%mm1,%%mm0
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40 psllq mm0, 16 //$16,%%mm0
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41 por mm0, mm1 //%%mm1,%%mm0
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42 psllq mm0, 16 //$16,%%mm0
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43 por mm0, mm1 //%%mm1,%%mm0 // mm0 = vol|vol|vol|vol
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44
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45 mixloopS16:
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46 movq mm1, [esi] //(%%esi),%%mm1\n" // mm1 = a|b|c|d
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47 movq mm2, mm1 //%%mm1,%%mm2\n" // mm2 = a|b|c|d
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48 movq mm4, [esi + 8] //8(%%esi),%%mm4\n" // mm4 = e|f|g|h
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49 // pre charger le buffer dst dans mm7
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50 movq mm7, [edi] //(%%edi),%%mm7\n" // mm7 = dst[0]"
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51 // multiplier par le volume
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52 pmullw mm1, mm0 //%%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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53 pmulhw mm2, mm0 //%%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v)
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54 movq mm5, mm4 //%%mm4,%%mm5\n" // mm5 = e|f|g|h
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55 pmullw mm4, mm0 //%%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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56 pmulhw mm5, mm0 //%%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v)
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57 movq mm3, mm1 //%%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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58 punpckhwd mm1, mm2 //%%mm2,%%mm1\n" // mm1 = a*v|b*v
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59 movq mm6, mm4 //%%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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60 punpcklwd mm3, mm2 //%%mm2,%%mm3\n" // mm3 = c*v|d*v
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61 punpckhwd mm4, mm5 //%%mm5,%%mm4\n" // mm4 = e*f|f*v
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62 punpcklwd mm6, mm5 //%%mm5,%%mm6\n" // mm6 = g*v|h*v
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63 // pre charger le buffer dst dans mm5
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64 movq mm5, [edi + 8] //8(%%edi),%%mm5\n" // mm5 = dst[1]
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65 // diviser par 128
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66 psrad mm1, 7 //$7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME
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67 add esi, 16 //$16,%%esi\n"
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68 psrad mm3, 7 //$7,%%mm3\n" // mm3 = c*v/128|d*v/128
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69 psrad mm4, 7 //$7,%%mm4\n" // mm4 = e*v/128|f*v/128
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70 // mm1 = le sample avec le volume modifie
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71 packssdw mm3, mm1 //%%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v)
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72 psrad mm6, 7 //$7,%%mm6\n" // mm6= g*v/128|h*v/128
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73 paddsw mm3, mm7 //%%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst
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74 // mm4 = le sample avec le volume modifie
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75 packssdw mm6, mm4 //%%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v)
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76 movq [edi], mm3 //%%mm3,(%%edi)\n"
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77 paddsw mm6, mm5 //%%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst
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78 movq [edi + 8], mm6 //%%mm6,8(%%edi)\n"
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79 add edi, 16 //$16,%%edi\n"
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80 dec ebx //%%ebx\n"
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81 jnz mixloopS16
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82
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83 ends16:
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84 emms
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85
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86 pop ebx
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87 pop esi
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88 pop edi
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89 }
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90
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91 }
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92
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93 ////////////////////////////////////////////////
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94 // Mixing for 8 bit signed buffers
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95 ////////////////////////////////////////////////
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96
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97 void SDL_MixAudio_MMX_S8_VC(char* dst,char* src,unsigned int nSize,int volume)
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98 {
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99 _asm
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100 {
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101 align 16
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102
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103 push edi
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104 push esi
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105 push ebx
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106
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107 mov edi, dst //movl %0,%%edi // edi = dst
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108 mov esi, src //%1,%%esi // esi = src
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109 mov eax, volume //%3,%%eax // eax = volume
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110
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111 movd mm0, ebx //%%ebx,%%mm0
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112 movq mm1, mm0 //%%mm0,%%mm1
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113 psllq mm0, 16 //$16,%%mm0
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114 por mm0, mm1 //%%mm1,%%mm0
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115 psllq mm0, 16 //$16,%%mm0
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116 por mm0, mm1 //%%mm1,%%mm0
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117 psllq mm0, 16 //$16,%%mm0
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118 por mm0, mm1 //%%mm1,%%mm0
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119
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120 mov ebx, nSize //%2,%%ebx // ebx = size
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121 shr ebx, 3 //$3,%%ebx // process 8 bytes per iteration = 8 samples
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122 cmp ebx, 0 //$0,%%ebx
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123 je endS8
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124
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125 mixloopS8:
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126 pxor mm2, mm2 //%%mm2,%%mm2 // mm2 = 0
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127 movq mm1, [esi] //(%%esi),%%mm1 // mm1 = a|b|c|d|e|f|g|h
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128 movq mm3, mm1 //%%mm1,%%mm3 // mm3 = a|b|c|d|e|f|g|h
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129 // on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0
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130 pcmpgtb mm2, mm1 //%%mm1,%%mm2 // mm2 = 11111111|00000000|00000000....
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131 punpckhbw mm1, mm2 //%%mm2,%%mm1 // mm1 = 0|a|0|b|0|c|0|d
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132 punpcklbw mm3, mm2 //%%mm2,%%mm3 // mm3 = 0|e|0|f|0|g|0|h
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133 movq mm2, [edi] //(%%edi),%%mm2 // mm2 = destination
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134 pmullw mm1, mm0 //%%mm0,%%mm1 // mm1 = v*a|v*b|v*c|v*d
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135 add esi, 8 //$8,%%esi
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136 pmullw mm3, mm0 //%%mm0,%%mm3 // mm3 = v*e|v*f|v*g|v*h
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137 psraw mm1, 7 //$7,%%mm1 // mm1 = v*a/128|v*b/128|v*c/128|v*d/128
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138 psraw mm3, 7 //$7,%%mm3 // mm3 = v*e/128|v*f/128|v*g/128|v*h/128
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139 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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140 paddsb mm3, mm2 //%%mm2,%%mm3 // add to destination buffer
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141 movq [edi], mm3 //%%mm3,(%%edi) // store back to ram
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142 add edi, 8 //$8,%%edi
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143 dec ebx //%%ebx
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144 jnz mixloopS8
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145
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146 endS8:
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147 emms
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148
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149 pop ebx
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150 pop esi
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151 pop edi
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152 }
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153 }
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154
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155 int _SDL_IsMMX_VC()
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156 {
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157 // This bit flag can get set on calling cpuid
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158 // with register eax set to 1
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159 const int _MMX_FEATURE_BIT = 0x00800000;
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160 DWORD dwFeature = 0;
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161 __try {
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162 _asm {
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163 mov eax,1
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164 cpuid
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165 mov dwFeature,edx
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166 }
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167 } __except ( EXCEPTION_EXECUTE_HANDLER) {
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168 return 0;
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169 }
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170 if (dwFeature & _MMX_FEATURE_BIT) {
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171 __try {
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172 __asm {
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173 pxor mm0, mm0
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174 emms
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175 }
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176 } __except (EXCEPTION_EXECUTE_HANDLER) {
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177 return(0);
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178 }
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179 return 1;
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180 }
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181
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182 return 0;
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183 }
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184
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185 static int _notTwice = 2;
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186
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187 int SDL_IsMMX_VC()
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188 {
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189 if (_notTwice > 1)
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190 {
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191 _notTwice = _SDL_IsMMX_VC();
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192 /*
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193 #ifdef _DEBUG
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194 if (_notTwice)
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195 MessageBox( NULL, "Using MMX!!!", "Error", MB_OK | MB_ICONINFORMATION );
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196 else
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197 MessageBox( NULL, "Not sing MMX!!!", "Error", MB_OK | MB_ICONINFORMATION );
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198 #endif
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199 */
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200 }
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201 return _notTwice;
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202 }
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203
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204 #endif
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205