1 /* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2012 Sam Lantinga 4 5 This library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 This library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with this library; if not, write to the Free Software 17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 18 19 Sam Lantinga 20 slouken (at) libsdl.org 21 */ 22 #include "SDL_config.h" 23 24 #include "SDL_mixer_MMX_VC.h" 25 26 #if defined(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */ 27 #if ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES) 28 // MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples 29 // Copyright 2002 Stephane Marchesin (stephane.marchesin (at) wanadoo.fr) 30 // Converted to Intel ASM notation by Cth 31 // This code is licensed under the LGPL (see COPYING for details) 32 // 33 // Assumes buffer size in bytes is a multiple of 16 34 // Assumes SDL_MIX_MAXVOLUME = 128 35 36 37 //////////////////////////////////////////////// 38 // Mixing for 16 bit signed buffers 39 //////////////////////////////////////////////// 40 41 void SDL_MixAudio_MMX_S16_VC(char* dst,char* src,unsigned int nSize,int volume) 42 { 43 __asm 44 { 45 46 push edi 47 push esi 48 push ebx 49 50 mov edi, dst // edi = dst 51 mov esi, src // esi = src 52 mov eax, volume // eax = volume 53 mov ebx, nSize // ebx = size 54 shr ebx, 4 // process 16 bytes per iteration = 8 samples 55 jz endS16 56 57 pxor mm0, mm0 58 movd mm0, eax //%%eax,%%mm0 59 movq mm1, mm0 //%%mm0,%%mm1 60 psllq mm0, 16 //$16,%%mm0 61 por mm0, mm1 //%%mm1,%%mm0 62 psllq mm0, 16 //$16,%%mm0 63 por mm0, mm1 //%%mm1,%%mm0 64 psllq mm0, 16 //$16,%%mm0 65 por mm0, mm1 //%%mm1,%%mm0 // mm0 = vol|vol|vol|vol 66 67 #ifndef __WATCOMC__ 68 align 16 69 #endif 70 mixloopS16: 71 movq mm1, [esi] //(%%esi),%%mm1\n" // mm1 = a|b|c|d 72 movq mm2, mm1 //%%mm1,%%mm2\n" // mm2 = a|b|c|d 73 movq mm4, [esi + 8] //8(%%esi),%%mm4\n" // mm4 = e|f|g|h 74 // pre charger le buffer dst dans mm7 75 movq mm7, [edi] //(%%edi),%%mm7\n" // mm7 = dst[0]" 76 // multiplier par le volume 77 pmullw mm1, mm0 //%%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v) 78 pmulhw mm2, mm0 //%%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v) 79 movq mm5, mm4 //%%mm4,%%mm5\n" // mm5 = e|f|g|h 80 pmullw mm4, mm0 //%%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v) 81 pmulhw mm5, mm0 //%%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v) 82 movq mm3, mm1 //%%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v) 83 punpckhwd mm1, mm2 //%%mm2,%%mm1\n" // mm1 = a*v|b*v 84 movq mm6, mm4 //%%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v) 85 punpcklwd mm3, mm2 //%%mm2,%%mm3\n" // mm3 = c*v|d*v 86 punpckhwd mm4, mm5 //%%mm5,%%mm4\n" // mm4 = e*f|f*v 87 punpcklwd mm6, mm5 //%%mm5,%%mm6\n" // mm6 = g*v|h*v 88 // pre charger le buffer dst dans mm5 89 movq mm5, [edi + 8] //8(%%edi),%%mm5\n" // mm5 = dst[1] 90 // diviser par 128 91 psrad mm1, 7 //$7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME 92 add esi, 16 //$16,%%esi\n" 93 psrad mm3, 7 //$7,%%mm3\n" // mm3 = c*v/128|d*v/128 94 psrad mm4, 7 //$7,%%mm4\n" // mm4 = e*v/128|f*v/128 95 // mm1 = le sample avec le volume modifie 96 packssdw mm3, mm1 //%%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v) 97 psrad mm6, 7 //$7,%%mm6\n" // mm6= g*v/128|h*v/128 98 paddsw mm3, mm7 //%%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst 99 // mm4 = le sample avec le volume modifie 100 packssdw mm6, mm4 //%%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v) 101 movq [edi], mm3 //%%mm3,(%%edi)\n" 102 paddsw mm6, mm5 //%%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst 103 movq [edi + 8], mm6 //%%mm6,8(%%edi)\n" 104 add edi, 16 //$16,%%edi\n" 105 dec ebx //%%ebx\n" 106 jnz mixloopS16 107 108 endS16: 109 emms 110 111 pop ebx 112 pop esi 113 pop edi 114 } 115 116 } 117 118 //////////////////////////////////////////////// 119 // Mixing for 8 bit signed buffers 120 //////////////////////////////////////////////// 121 122 void SDL_MixAudio_MMX_S8_VC(char* dst,char* src,unsigned int nSize,int volume) 123 { 124 _asm 125 { 126 127 push edi 128 push esi 129 push ebx 130 131 mov edi, dst //movl %0,%%edi // edi = dst 132 mov esi, src //%1,%%esi // esi = src 133 mov eax, volume //%3,%%eax // eax = volume 134 135 movd mm0, eax //%%eax,%%mm0 136 movq mm1, mm0 //%%mm0,%%mm1 137 psllq mm0, 16 //$16,%%mm0 138 por mm0, mm1 //%%mm1,%%mm0 139 psllq mm0, 16 //$16,%%mm0 140 por mm0, mm1 //%%mm1,%%mm0 141 psllq mm0, 16 //$16,%%mm0 142 por mm0, mm1 //%%mm1,%%mm0 143 144 mov ebx, nSize //%2,%%ebx // ebx = size 145 shr ebx, 3 //$3,%%ebx // process 8 bytes per iteration = 8 samples 146 cmp ebx, 0 //$0,%%ebx 147 je endS8 148 149 #ifndef __WATCOMC__ 150 align 16 151 #endif 152 mixloopS8: 153 pxor mm2, mm2 //%%mm2,%%mm2 // mm2 = 0 154 movq mm1, [esi] //(%%esi),%%mm1 // mm1 = a|b|c|d|e|f|g|h 155 movq mm3, mm1 //%%mm1,%%mm3 // mm3 = a|b|c|d|e|f|g|h 156 // on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0 157 pcmpgtb mm2, mm1 //%%mm1,%%mm2 // mm2 = 11111111|00000000|00000000.... 158 punpckhbw mm1, mm2 //%%mm2,%%mm1 // mm1 = 0|a|0|b|0|c|0|d 159 punpcklbw mm3, mm2 //%%mm2,%%mm3 // mm3 = 0|e|0|f|0|g|0|h 160 movq mm2, [edi] //(%%edi),%%mm2 // mm2 = destination 161 pmullw mm1, mm0 //%%mm0,%%mm1 // mm1 = v*a|v*b|v*c|v*d 162 add esi, 8 //$8,%%esi 163 pmullw mm3, mm0 //%%mm0,%%mm3 // mm3 = v*e|v*f|v*g|v*h 164 psraw mm1, 7 //$7,%%mm1 // mm1 = v*a/128|v*b/128|v*c/128|v*d/128 165 psraw mm3, 7 //$7,%%mm3 // mm3 = v*e/128|v*f/128|v*g/128|v*h/128 166 packsswb mm3, mm1 //%%mm1,%%mm3 // mm1 = v*a/128|v*b/128|v*c/128|v*d/128|v*e/128|v*f/128|v*g/128|v*h/128 167 paddsb mm3, mm2 //%%mm2,%%mm3 // add to destination buffer 168 movq [edi], mm3 //%%mm3,(%%edi) // store back to ram 169 add edi, 8 //$8,%%edi 170 dec ebx //%%ebx 171 jnz mixloopS8 172 173 endS8: 174 emms 175 176 pop ebx 177 pop esi 178 pop edi 179 } 180 } 181 182 #endif /* SDL_ASSEMBLY_ROUTINES */ 183 #endif /* SDL_BUGGY_MMX_MIXERS */ 184
