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annotate src/audio/SDL_mixer_MMX.c @ 4389:c6c3a6e7db46 SDL-1.2

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Fixed bug #899 Jeremiah Morris 2009-12-09 16:23:50 PST Re-enable mouseLocation workaround on 10.4, 10.5 OS X systems before 10.6 have a bug with [NSEvent mouseLocation] if the screen resolution changes. SDL_QuartzVideo.m contains a workaround for this bug, but it was placed inside an #ifdef in revision 4762. The comment reads, "I'm gambling they fixed this by 10.4." After seeing this bug on several Tiger and Leopard systems (both PPC and Intel), I can confirm that it's not fixed until 10.6. The workaround doesn't compile for x86_64/10.6, so I can understand why it was segregated, but it needs to remain in place for the i386 and ppc versions. The workaround causes no problems under 10.6, even though it's not necessary there. Patch is attached with one method of keeping the workaround active on the systems that need it.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 11 Dec 2009 15:11:49 +0000
parents a8e5b518e194
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /*
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25 MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples
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26 Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr)
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27 This code is licensed under the LGPL (see COPYING for details)
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28
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29 Assumes buffer size in bytes is a multiple of 16
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30 Assumes SDL_MIX_MAXVOLUME = 128
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31 */
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32
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33
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34 /***********************************************
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35 * Mixing for 16 bit signed buffers
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36 ***********************************************/
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37
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38 #if defined(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */
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39 #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES)
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40 void SDL_MixAudio_MMX_S16(char* dst,char* src,unsigned int size,int volume)
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41 {
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42 __asm__ __volatile__ (
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43
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44 " movl %3,%%eax\n" /* eax = volume */
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45
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46 " movl %2,%%edx\n" /* edx = size */
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47
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48 " shrl $4,%%edx\n" /* process 16 bytes per iteration = 8 samples */
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49
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50 " jz .endS16\n"
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51
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52 " pxor %%mm0,%%mm0\n"
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53
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54 " movd %%eax,%%mm0\n"
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55 " movq %%mm0,%%mm1\n"
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56 " psllq $16,%%mm0\n"
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57 " por %%mm1,%%mm0\n"
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58 " psllq $16,%%mm0\n"
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59 " por %%mm1,%%mm0\n"
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60 " psllq $16,%%mm0\n"
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61 " por %%mm1,%%mm0\n" /* mm0 = vol|vol|vol|vol */
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62
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63 ".align 8\n"
539
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64 " .mixloopS16:\n"
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65
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66 " movq (%1),%%mm1\n" /* mm1 = a|b|c|d */
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68 " movq %%mm1,%%mm2\n" /* mm2 = a|b|c|d */
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70 " movq 8(%1),%%mm4\n" /* mm4 = e|f|g|h */
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72 /* pré charger le buffer dst dans mm7 */
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73 " movq (%0),%%mm7\n" /* mm7 = dst[0] */
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75 /* multiplier par le volume */
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76 " pmullw %%mm0,%%mm1\n" /* mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */
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78 " pmulhw %%mm0,%%mm2\n" /* mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v) */
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79 " movq %%mm4,%%mm5\n" /* mm5 = e|f|g|h */
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81 " pmullw %%mm0,%%mm4\n" /* mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */
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83 " pmulhw %%mm0,%%mm5\n" /* mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v) */
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84 " movq %%mm1,%%mm3\n" /* mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */
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86 " punpckhwd %%mm2,%%mm1\n" /* mm1 = a*v|b*v */
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88 " movq %%mm4,%%mm6\n" /* mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */
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89 " punpcklwd %%mm2,%%mm3\n" /* mm3 = c*v|d*v */
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91 " punpckhwd %%mm5,%%mm4\n" /* mm4 = e*f|f*v */
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93 " punpcklwd %%mm5,%%mm6\n" /* mm6 = g*v|h*v */
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95 /* pré charger le buffer dst dans mm5 */
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96 " movq 8(%0),%%mm5\n" /* mm5 = dst[1] */
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98 /* diviser par 128 */
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99 " psrad $7,%%mm1\n" /* mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME */
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100 " add $16,%1\n"
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102 " psrad $7,%%mm3\n" /* mm3 = c*v/128|d*v/128 */
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104 " psrad $7,%%mm4\n" /* mm4 = e*v/128|f*v/128 */
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106 /* mm1 = le sample avec le volume modifié */
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107 " packssdw %%mm1,%%mm3\n" /* mm3 = s(a*v|b*v|c*v|d*v) */
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109 " psrad $7,%%mm6\n" /* mm6= g*v/128|h*v/128 */
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110 " paddsw %%mm7,%%mm3\n" /* mm3 = adjust_volume(src)+dst */
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112 /* mm4 = le sample avec le volume modifié */
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113 " packssdw %%mm4,%%mm6\n" /* mm6 = s(e*v|f*v|g*v|h*v) */
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114 " movq %%mm3,(%0)\n"
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116 " paddsw %%mm5,%%mm6\n" /* mm6 = adjust_volume(src)+dst */
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118 " movq %%mm6,8(%0)\n"
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120 " add $16,%0\n"
539
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121
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122 " dec %%edx\n"
539
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123
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124 " jnz .mixloopS16\n"
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125
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126 " emms\n"
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127
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128 ".endS16:\n"
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129 :
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130 : "r" (dst), "r"(src),"m"(size),
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131 "m"(volume)
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132 : "eax","edx","memory"
539
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133 );
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134 }
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135
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136
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137
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138 /*////////////////////////////////////////////// */
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139 /* Mixing for 8 bit signed buffers */
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140 /*////////////////////////////////////////////// */
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141
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142 void SDL_MixAudio_MMX_S8(char* dst,char* src,unsigned int size,int volume)
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143 {
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144 __asm__ __volatile__ (
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145
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146 " movl %3,%%eax\n" /* eax = volume */
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147
1147
b580f7201543 From: "Alex Volkov" <avcp-sdlmail@usa.net>
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148 " movd %%eax,%%mm0\n"
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149 " movq %%mm0,%%mm1\n"
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150 " psllq $16,%%mm0\n"
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151 " por %%mm1,%%mm0\n"
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152 " psllq $16,%%mm0\n"
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153 " por %%mm1,%%mm0\n"
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154 " psllq $16,%%mm0\n"
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155 " por %%mm1,%%mm0\n"
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156
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157 " movl %2,%%edx\n" /* edx = size */
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158 " shr $3,%%edx\n" /* process 8 bytes per iteration = 8 samples */
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159
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160 " cmp $0,%%edx\n"
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161 " je .endS8\n"
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162
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163 ".align 8\n"
539
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164 " .mixloopS8:\n"
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165
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166 " pxor %%mm2,%%mm2\n" /* mm2 = 0 */
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167 " movq (%1),%%mm1\n" /* mm1 = a|b|c|d|e|f|g|h */
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168
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169 " movq %%mm1,%%mm3\n" /* mm3 = a|b|c|d|e|f|g|h */
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170
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171 /* on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0 */
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172 " pcmpgtb %%mm1,%%mm2\n" /* mm2 = 11111111|00000000|00000000.... */
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173
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174 " punpckhbw %%mm2,%%mm1\n" /* mm1 = 0|a|0|b|0|c|0|d */
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175
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176 " punpcklbw %%mm2,%%mm3\n" /* mm3 = 0|e|0|f|0|g|0|h */
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177 " movq (%0),%%mm2\n" /* mm2 = destination */
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178
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179 " pmullw %%mm0,%%mm1\n" /* mm1 = v*a|v*b|v*c|v*d */
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180 " add $8,%1\n"
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181
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182 " pmullw %%mm0,%%mm3\n" /* mm3 = v*e|v*f|v*g|v*h */
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183 " psraw $7,%%mm1\n" /* mm1 = v*a/128|v*b/128|v*c/128|v*d/128 */
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184
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185 " psraw $7,%%mm3\n" /* mm3 = v*e/128|v*f/128|v*g/128|v*h/128 */
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186
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187 " 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 */
539
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188
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189 " paddsb %%mm2,%%mm3\n" /* add to destination buffer */
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190
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191 " movq %%mm3,(%0)\n" /* store back to ram */
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192 " add $8,%0\n"
539
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193
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194 " dec %%edx\n"
539
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195
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196 " jnz .mixloopS8\n"
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197
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198 ".endS8:\n"
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199 " emms\n"
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200 :
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201 : "r" (dst), "r"(src),"m"(size),
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202 "m"(volume)
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203 : "eax","edx","memory"
539
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204 );
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205 }
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206 #endif
4322
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207 #endif