Mercurial > sdl-ios-xcode
annotate src/audio/SDL_mixer_MMX.c @ 779:68c8da837fc0
Date: Tue, 6 Jan 2004 21:54:02 +0100
From: Max Horn
Subject: Auto hide mouse & other changes
the attached bug adds the auto-hide-mouse feature I talked about
earlier. Turned out it was a lot simpler than I thought, simply by
using our existing code :-). I actually spent much more time on fixing
various bugs in the code and correcting (IMO) some behavior (although,
due to the lack of real specs for SDL, it's probably arguable what
'correct' means...).
* adds auto (un)hiding of mouse depending on whether it is in- or
outside the game window
* computation of course coordinates is correct now (it often and
reproducible got out of sync with the old code, since the NSEvent
window was in some cases *not* our window anymore, so locationInWindow
returned wrong results)
* added a method which at any time returns the mouse coords, relative
to our window
* fixed handling of lost/gain input/mouse/app focus "events"
author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 07 Jan 2004 15:01:51 +0000 |
parents | a9e38f3b8e4d |
children | b4b64bb88f2f |
rev | line source |
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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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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 |