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annotate src/audio/SDL_mixer_MMX.c @ 641:df178851293b

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Date: 28 Jun 2003 22:42:52 +0100 From: Alan Swanson Subject: Re: [SDL] New XFree 4.3 Video Mode Patch I have a wee amendment that moves the qsort in set_best_resolution to only occur after failing to find an exact match only. This would make absolutely sure we get a user set mode. While I've never had any problems for my normal resolutions (1280x1024, 1024x768, 800x600 & 640,480) while closely examining the output from qsort I've noticed it doesn't seem to sort the modes fully. These is one definite wrong at 1152x768 and a few that just look wrong to me. From a program (attached) I made to examine this more easily. X has sorted its mode list using the same method as ours (plus frequency), and our user modes get inserted without any other movement. On the patch I've made I've also changed cmpmodes to sort on vertical resolution and then horizontal. Ie vertical is now most significant bit.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 28 Jun 2003 21:52:26 +0000
parents a9e38f3b8e4d
children b4b64bb88f2f
rev   line source
539
a9e38f3b8e4d Added MMX audio mixing code for gcc (thanks Stephane!)
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1 // MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples
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2 // Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr)
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3 // This code is licensed under the LGPL (see COPYING for details)
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4 //
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5 // Assumes buffer size in bytes is a multiple of 16
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6 // Assumes SDL_MIX_MAXVOLUME = 128
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7
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8
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9 ////////////////////////////////////////////////
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10 // Mixing for 16 bit signed buffers
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11 ////////////////////////////////////////////////
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12
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13 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
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14 void SDL_MixAudio_MMX_S16(char* dst,char* src,unsigned int size,int volume)
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15 {
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16 __asm__ __volatile__ (
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17
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18 " movl %0,%%edi\n" // edi = dst
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19 " movl %1,%%esi\n" // esi = src
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20 " movl %3,%%eax\n" // eax = volume
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21
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22 " movl %2,%%ebx\n" // ebx = size
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23
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24 " shrl $4,%%ebx\n" // process 16 bytes per iteration = 8 samples
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25
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26 " jz .endS16\n"
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27
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28 " pxor %%mm0,%%mm0\n"
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29
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30 " movd %%eax,%%mm0\n"
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31 " movq %%mm0,%%mm1\n"
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32 " psllq $16,%%mm0\n"
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33 " por %%mm1,%%mm0\n"
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34 " psllq $16,%%mm0\n"
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35 " por %%mm1,%%mm0\n"
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36 " psllq $16,%%mm0\n"
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37 " por %%mm1,%%mm0\n" // mm0 = vol|vol|vol|vol
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38
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39 ".align 16\n"
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40 " .mixloopS16:\n"
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41
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42 " movq (%%esi),%%mm1\n" // mm1 = a|b|c|d
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43
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44 " movq %%mm1,%%mm2\n" // mm2 = a|b|c|d
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45
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46 " movq 8(%%esi),%%mm4\n" // mm4 = e|f|g|h
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47
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48 // pré charger le buffer dst dans mm7
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49 " movq (%%edi),%%mm7\n" // mm7 = dst[0]"
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50
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51 // multiplier par le volume
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52 " pmullw %%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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53
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54 " pmulhw %%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v)
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55 " movq %%mm4,%%mm5\n" // mm5 = e|f|g|h
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56
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57 " pmullw %%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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58
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59 " pmulhw %%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v)
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60 " movq %%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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61
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62 " punpckhwd %%mm2,%%mm1\n" // mm1 = a*v|b*v
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63
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64 " movq %%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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65 " punpcklwd %%mm2,%%mm3\n" // mm3 = c*v|d*v
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66
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67 " punpckhwd %%mm5,%%mm4\n" // mm4 = e*f|f*v
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68
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69 " punpcklwd %%mm5,%%mm6\n" // mm6 = g*v|h*v
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70
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71 // pré charger le buffer dst dans mm5
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72 " movq 8(%%edi),%%mm5\n" // mm5 = dst[1]
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73
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74 // diviser par 128
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75 " psrad $7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME
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76 " addl $16,%%esi\n"
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77
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78 " psrad $7,%%mm3\n" // mm3 = c*v/128|d*v/128
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79
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80 " psrad $7,%%mm4\n" // mm4 = e*v/128|f*v/128
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81
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82 // mm1 = le sample avec le volume modifié
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83 " packssdw %%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v)
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84
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85 " psrad $7,%%mm6\n" // mm6= g*v/128|h*v/128
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86 " paddsw %%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst
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87
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88 // mm4 = le sample avec le volume modifié
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89 " packssdw %%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v)
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90 " movq %%mm3,(%%edi)\n"
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91
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92 " paddsw %%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst
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93
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94 " movq %%mm6,8(%%edi)\n"
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95
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96 " addl $16,%%edi\n"
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97
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98 " dec %%ebx\n"
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99
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100 " jnz .mixloopS16\n"
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101
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102 " emms\n"
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103
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104 ".endS16:\n"
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105 :
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106 : "m" (dst), "m"(src),"m"(size),
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107 "m"(volume)
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108 : "eax","ebx", "esi", "edi","memory"
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109 );
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110 }
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114 ////////////////////////////////////////////////
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115 // Mixing for 8 bit signed buffers
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116 ////////////////////////////////////////////////
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117
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118 void SDL_MixAudio_MMX_S8(char* dst,char* src,unsigned int size,int volume)
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119 {
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120 __asm__ __volatile__ (
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121
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122 " movl %0,%%edi\n" // edi = dst
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123 " movl %1,%%esi\n" // esi = src
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124 " movl %3,%%eax\n" // eax = volume
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125
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126 " movd %%ebx,%%mm0\n"
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127 " movq %%mm0,%%mm1\n"
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128 " psllq $16,%%mm0\n"
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129 " por %%mm1,%%mm0\n"
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130 " psllq $16,%%mm0\n"
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131 " por %%mm1,%%mm0\n"
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132 " psllq $16,%%mm0\n"
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133 " por %%mm1,%%mm0\n"
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134
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135 " movl %2,%%ebx\n" // ebx = size
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136 " shr $3,%%ebx\n" // process 8 bytes per iteration = 8 samples
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137
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138 " cmp $0,%%ebx\n"
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139 " je .endS8\n"
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140
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141 ".align 16\n"
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142 " .mixloopS8:\n"
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143
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144 " pxor %%mm2,%%mm2\n" // mm2 = 0
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145 " movq (%%esi),%%mm1\n" // mm1 = a|b|c|d|e|f|g|h
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146
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147 " movq %%mm1,%%mm3\n" // mm3 = a|b|c|d|e|f|g|h
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148
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149 // on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0
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150 " pcmpgtb %%mm1,%%mm2\n" // mm2 = 11111111|00000000|00000000....
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151
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152 " punpckhbw %%mm2,%%mm1\n" // mm1 = 0|a|0|b|0|c|0|d
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153
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154 " punpcklbw %%mm2,%%mm3\n" // mm3 = 0|e|0|f|0|g|0|h
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155 " movq (%%edi),%%mm2\n" // mm2 = destination
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156
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157 " pmullw %%mm0,%%mm1\n" // mm1 = v*a|v*b|v*c|v*d
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158 " addl $8,%%esi\n"
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159
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160 " pmullw %%mm0,%%mm3\n" // mm3 = v*e|v*f|v*g|v*h
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161 " psraw $7,%%mm1\n" // mm1 = v*a/128|v*b/128|v*c/128|v*d/128
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162
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163 " psraw $7,%%mm3\n" // mm3 = v*e/128|v*f/128|v*g/128|v*h/128
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164
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165 " packsswb %%mm1,%%mm3\n" // 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
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167 " paddsb %%mm2,%%mm3\n" // add to destination buffer
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168
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169 " movq %%mm3,(%%edi)\n" // store back to ram
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170 " addl $8,%%edi\n"
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171
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172 " dec %%ebx\n"
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173
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174 " jnz .mixloopS8\n"
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175
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176 ".endS8:\n"
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177 " emms\n"
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178 :
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179 : "m" (dst), "m"(src),"m"(size),
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180 "m"(volume)
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181 : "eax","ebx", "esi", "edi","memory"
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182 );
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183 }
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184 #endif
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185