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annotate src/audio/SDL_mixer_MMX.c @ 4168:69bcba65c388 SDL-1.2

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Fixed bug #526 Comment #1 From Simon Howard 2009-03-20 16:50:56 Hi, I'm the author of Chocolate Doom, one of the other source ports that James mentioned. This is a patch against the current SVN version of SDL 1.2 that fixes the bug. It has been tested and hopefully should be obviously correct from examining the changes. I'll give a brief explanation. When the palette is set with SDL_SetPalette, the IDirectDrawPalette_SetEntries DirectX function is invoked. However, when this happens, a WM_PALETTECHANGED message is sent to the window. A WM_PALETTECHANGED message can also be received if the palette is changed for some other reason, like if the system palette is changed. Therefore, the palette change handler (DX5_PaletteChanged) has code to deal with this case. It distinguishes "expected" palette changes (set with SDL_SetPalette) from "unexpected" palette changes using the colorchange_expected variable, which is set before calling IDirectDrawPalette_SetEntries. However, the code to set this variable is missing in the fullscreen code path. By setting this variable, the palette change is handled properly and the freezes go away.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 13 Apr 2009 00:53:12 +0000
parents a1b03ba2fcd0
children a8e5b518e194
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(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES)
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39 void SDL_MixAudio_MMX_S16(char* dst,char* src,unsigned int size,int volume)
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40 {
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41 __asm__ __volatile__ (
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42
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43 " movl %3,%%eax\n" /* eax = volume */
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44
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45 " movl %2,%%edx\n" /* edx = size */
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46
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47 " shrl $4,%%edx\n" /* process 16 bytes per iteration = 8 samples */
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48
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49 " jz .endS16\n"
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50
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51 " pxor %%mm0,%%mm0\n"
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52
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53 " movd %%eax,%%mm0\n"
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54 " movq %%mm0,%%mm1\n"
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55 " psllq $16,%%mm0\n"
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56 " por %%mm1,%%mm0\n"
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57 " psllq $16,%%mm0\n"
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58 " por %%mm1,%%mm0\n"
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59 " psllq $16,%%mm0\n"
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60 " por %%mm1,%%mm0\n" /* mm0 = vol|vol|vol|vol */
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61
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62 ".align 8\n"
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63 " .mixloopS16:\n"
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64
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65 " movq (%1),%%mm1\n" /* mm1 = a|b|c|d */
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67 " movq %%mm1,%%mm2\n" /* mm2 = a|b|c|d */
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69 " movq 8(%1),%%mm4\n" /* mm4 = e|f|g|h */
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71 /* pré charger le buffer dst dans mm7 */
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72 " movq (%0),%%mm7\n" /* mm7 = dst[0] */
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74 /* multiplier par le volume */
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75 " pmullw %%mm0,%%mm1\n" /* mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */
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77 " pmulhw %%mm0,%%mm2\n" /* mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v) */
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78 " movq %%mm4,%%mm5\n" /* mm5 = e|f|g|h */
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80 " pmullw %%mm0,%%mm4\n" /* mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */
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82 " pmulhw %%mm0,%%mm5\n" /* mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v) */
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83 " movq %%mm1,%%mm3\n" /* mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */
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85 " punpckhwd %%mm2,%%mm1\n" /* mm1 = a*v|b*v */
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87 " movq %%mm4,%%mm6\n" /* mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */
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88 " punpcklwd %%mm2,%%mm3\n" /* mm3 = c*v|d*v */
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90 " punpckhwd %%mm5,%%mm4\n" /* mm4 = e*f|f*v */
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92 " punpcklwd %%mm5,%%mm6\n" /* mm6 = g*v|h*v */
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94 /* pré charger le buffer dst dans mm5 */
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95 " movq 8(%0),%%mm5\n" /* mm5 = dst[1] */
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97 /* diviser par 128 */
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98 " psrad $7,%%mm1\n" /* mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME */
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99 " add $16,%1\n"
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101 " psrad $7,%%mm3\n" /* mm3 = c*v/128|d*v/128 */
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103 " psrad $7,%%mm4\n" /* mm4 = e*v/128|f*v/128 */
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105 /* mm1 = le sample avec le volume modifié */
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106 " packssdw %%mm1,%%mm3\n" /* mm3 = s(a*v|b*v|c*v|d*v) */
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108 " psrad $7,%%mm6\n" /* mm6= g*v/128|h*v/128 */
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109 " paddsw %%mm7,%%mm3\n" /* mm3 = adjust_volume(src)+dst */
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111 /* mm4 = le sample avec le volume modifié */
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112 " packssdw %%mm4,%%mm6\n" /* mm6 = s(e*v|f*v|g*v|h*v) */
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113 " movq %%mm3,(%0)\n"
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115 " paddsw %%mm5,%%mm6\n" /* mm6 = adjust_volume(src)+dst */
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117 " movq %%mm6,8(%0)\n"
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119 " add $16,%0\n"
539
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120
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121 " dec %%edx\n"
539
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122
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123 " jnz .mixloopS16\n"
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124
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125 " emms\n"
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126
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127 ".endS16:\n"
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128 :
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129 : "r" (dst), "r"(src),"m"(size),
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130 "m"(volume)
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131 : "eax","edx","memory"
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132 );
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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 /* Mixing for 8 bit signed buffers */
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139 /*////////////////////////////////////////////// */
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140
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141 void SDL_MixAudio_MMX_S8(char* dst,char* src,unsigned int size,int volume)
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142 {
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143 __asm__ __volatile__ (
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144
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145 " movl %3,%%eax\n" /* eax = volume */
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146
1147
b580f7201543 From: "Alex Volkov" <avcp-sdlmail@usa.net>
Ryan C. Gordon <icculus@icculus.org>
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147 " movd %%eax,%%mm0\n"
539
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148 " movq %%mm0,%%mm1\n"
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149 " psllq $16,%%mm0\n"
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150 " por %%mm1,%%mm0\n"
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151 " psllq $16,%%mm0\n"
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152 " por %%mm1,%%mm0\n"
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153 " psllq $16,%%mm0\n"
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154 " por %%mm1,%%mm0\n"
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155
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156 " movl %2,%%edx\n" /* edx = size */
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157 " shr $3,%%edx\n" /* process 8 bytes per iteration = 8 samples */
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158
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159 " cmp $0,%%edx\n"
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160 " je .endS8\n"
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161
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162 ".align 8\n"
539
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163 " .mixloopS8:\n"
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164
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165 " pxor %%mm2,%%mm2\n" /* mm2 = 0 */
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166 " movq (%1),%%mm1\n" /* mm1 = a|b|c|d|e|f|g|h */
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167
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168 " movq %%mm1,%%mm3\n" /* mm3 = a|b|c|d|e|f|g|h */
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169
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170 /* on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0 */
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171 " pcmpgtb %%mm1,%%mm2\n" /* mm2 = 11111111|00000000|00000000.... */
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172
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173 " punpckhbw %%mm2,%%mm1\n" /* mm1 = 0|a|0|b|0|c|0|d */
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174
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175 " punpcklbw %%mm2,%%mm3\n" /* mm3 = 0|e|0|f|0|g|0|h */
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176 " movq (%0),%%mm2\n" /* mm2 = destination */
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177
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178 " pmullw %%mm0,%%mm1\n" /* mm1 = v*a|v*b|v*c|v*d */
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179 " add $8,%1\n"
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180
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181 " pmullw %%mm0,%%mm3\n" /* mm3 = v*e|v*f|v*g|v*h */
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182 " psraw $7,%%mm1\n" /* mm1 = v*a/128|v*b/128|v*c/128|v*d/128 */
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183
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184 " psraw $7,%%mm3\n" /* mm3 = v*e/128|v*f/128|v*g/128|v*h/128 */
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185
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186 " 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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187
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188 " paddsb %%mm2,%%mm3\n" /* add to destination buffer */
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189
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190 " movq %%mm3,(%0)\n" /* store back to ram */
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191 " add $8,%0\n"
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192
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193 " dec %%edx\n"
539
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194
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195 " jnz .mixloopS8\n"
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196
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197 ".endS8:\n"
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198 " emms\n"
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199 :
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200 : "r" (dst), "r"(src),"m"(size),
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201 "m"(volume)
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202 : "eax","edx","memory"
539
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203 );
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204 }
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205 #endif
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206