Mercurial > sdl-ios-xcode
annotate src/audio/SDL_mixer_MMX.c @ 1258:b2283b0ded26
Date: Thu, 19 Jan 2006 20:02:29 +0200
From: Vassilis Virvilis <vasvir@iit.demokritos.gr>
Subject: [SDL] Request: Please reconsider adding tag in SDL_Event
Hi,
Patch in question:
--- include/SDL_events.h 20 Aug 2004 18:57:01 -0000 1.11
+++ include/SDL_events.h 19 Jan 2006 17:35:09 -0000
@@ -214,7 +214,7 @@
} SDL_SysWMEvent;
/* General event structure */
-typedef union {
+typedef union SDL_Event {
Uint8 type;
SDL_ActiveEvent active;
SDL_KeyboardEvent key;
Reasoning:
----------
1) Allows forward declaration of the SDL_Event union in C++. Please
note that in plain C it is possible to forward declare it.
2) Forward declaration is good because it allows encapsulation. It hides
the specific implementation and does not necessarily exposes SDL staff
to my appication's namespace
3) It can't harm plain C because tags are living in a different namespace
than typenames
4) It is already done like this in other places in SDL. Check for example
SDL_KeySym, and SDL_.*Event structures.
5) Right now I have to include SDL/event.h from a C++ header file. See 2)
author | Sam Lantinga <slouken@libsdl.org> |
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date | Fri, 20 Jan 2006 13:07:25 +0000 |
parents | b580f7201543 |
children | d910939febfa |
rev | line source |
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1019
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1 /* |
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2 MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples |
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3 Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr) |
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4 This code is licensed under the LGPL (see COPYING for details) |
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5 |
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6 Assumes buffer size in bytes is a multiple of 16 |
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7 Assumes SDL_MIX_MAXVOLUME = 128 |
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8 */ |
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9 |
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10 |
1019
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11 /*********************************************** |
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12 * Mixing for 16 bit signed buffers |
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13 ***********************************************/ |
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14 |
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15 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) |
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16 void SDL_MixAudio_MMX_S16(char* dst,char* src,unsigned int size,int volume) |
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17 { |
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18 __asm__ __volatile__ ( |
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19 |
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20 " movl %3,%%eax\n" // eax = volume |
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21 |
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22 " movl %2,%%edx\n" // edx = size |
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23 |
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24 " shrl $4,%%edx\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 (%1),%%mm1\n" // mm1 = a|b|c|d |
539
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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(%1),%%mm4\n" // mm4 = e|f|g|h |
539
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47 |
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48 // pré charger le buffer dst dans mm7 |
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49 " movq (%0),%%mm7\n" // mm7 = dst[0]" |
539
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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(%0),%%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 " add $16,%1\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,(%0)\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(%0)\n" |
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95 |
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96 " add $16,%0\n" |
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97 |
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98 " dec %%edx\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 : "r" (dst), "r"(src),"m"(size), |
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107 "m"(volume) |
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108 : "eax","edx","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 %3,%%eax\n" // eax = volume |
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123 |
1147
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From: "Alex Volkov" <avcp-sdlmail@usa.net>
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124 " movd %%eax,%%mm0\n" |
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125 " movq %%mm0,%%mm1\n" |
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126 " psllq $16,%%mm0\n" |
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127 " por %%mm1,%%mm0\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 |
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133 " movl %2,%%edx\n" // edx = size |
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134 " shr $3,%%edx\n" // process 8 bytes per iteration = 8 samples |
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135 |
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136 " cmp $0,%%edx\n" |
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137 " je .endS8\n" |
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138 |
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139 ".align 16\n" |
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140 " .mixloopS8:\n" |
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141 |
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142 " pxor %%mm2,%%mm2\n" // mm2 = 0 |
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143 " movq (%1),%%mm1\n" // mm1 = a|b|c|d|e|f|g|h |
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144 |
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145 " movq %%mm1,%%mm3\n" // mm3 = a|b|c|d|e|f|g|h |
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146 |
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147 // on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0 |
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148 " pcmpgtb %%mm1,%%mm2\n" // mm2 = 11111111|00000000|00000000.... |
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149 |
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150 " punpckhbw %%mm2,%%mm1\n" // mm1 = 0|a|0|b|0|c|0|d |
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151 |
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152 " punpcklbw %%mm2,%%mm3\n" // mm3 = 0|e|0|f|0|g|0|h |
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153 " movq (%0),%%mm2\n" // mm2 = destination |
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154 |
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155 " pmullw %%mm0,%%mm1\n" // mm1 = v*a|v*b|v*c|v*d |
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156 " add $8,%1\n" |
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157 |
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158 " pmullw %%mm0,%%mm3\n" // mm3 = v*e|v*f|v*g|v*h |
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159 " psraw $7,%%mm1\n" // mm1 = v*a/128|v*b/128|v*c/128|v*d/128 |
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160 |
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161 " psraw $7,%%mm3\n" // mm3 = v*e/128|v*f/128|v*g/128|v*h/128 |
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162 |
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163 " 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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164 |
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165 " paddsb %%mm2,%%mm3\n" // add to destination buffer |
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166 |
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167 " movq %%mm3,(%0)\n" // store back to ram |
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168 " add $8,%0\n" |
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169 |
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170 " dec %%edx\n" |
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171 |
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172 " jnz .mixloopS8\n" |
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173 |
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174 ".endS8:\n" |
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175 " emms\n" |
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176 : |
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177 : "r" (dst), "r"(src),"m"(size), |
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178 "m"(volume) |
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179 : "eax","edx","memory" |
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180 ); |
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181 } |
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182 #endif |
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183 |