Mercurial > sdl-ios-xcode
annotate src/audio/SDL_mixer_MMX.c @ 809:dba98fb391e7
Date: Tue, 13 Jan 2004 19:25:37 +0300
From: Dmitry Yakimov
Subject: [SDL] [PATCH] SDL bug patch
Let me introduce 2 fixes to SDL.
1. Preventing great slowdown on fast machines while hardware
flipping (it's obviously bug).
2. Setting up 85 Hz of monitor if supported. The reason is that
Win98 by default sets lowest frequency 60 Hz.
And we can't set up maximum frequency because some users can have
wrong monitor drivers.
This is important for shareware and commercial programs.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 11 Feb 2004 16:10:16 +0000 |
parents | a9e38f3b8e4d |
children | b4b64bb88f2f |
rev | line source |
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539
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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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111 |
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112 |
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113 |
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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 |