| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2012 Sam Lantinga |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| |
| Sam Lantinga |
| slouken@libsdl.org |
| */ |
| #include "SDL_config.h" |
| |
| #include "SDL_mixer_MMX_VC.h" |
| |
| #if defined(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */ |
| #if ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES) |
| // MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples |
| // Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr) |
| // Converted to Intel ASM notation by Cth |
| // This code is licensed under the LGPL (see COPYING for details) |
| // |
| // Assumes buffer size in bytes is a multiple of 16 |
| // Assumes SDL_MIX_MAXVOLUME = 128 |
| |
| |
| //////////////////////////////////////////////// |
| // Mixing for 16 bit signed buffers |
| //////////////////////////////////////////////// |
| |
| void SDL_MixAudio_MMX_S16_VC(char* dst,char* src,unsigned int nSize,int volume) |
| { |
| __asm |
| { |
| |
| push edi |
| push esi |
| push ebx |
| |
| mov edi, dst // edi = dst |
| mov esi, src // esi = src |
| mov eax, volume // eax = volume |
| mov ebx, nSize // ebx = size |
| shr ebx, 4 // process 16 bytes per iteration = 8 samples |
| jz endS16 |
| |
| pxor mm0, mm0 |
| movd mm0, eax //%%eax,%%mm0 |
| movq mm1, mm0 //%%mm0,%%mm1 |
| psllq mm0, 16 //$16,%%mm0 |
| por mm0, mm1 //%%mm1,%%mm0 |
| psllq mm0, 16 //$16,%%mm0 |
| por mm0, mm1 //%%mm1,%%mm0 |
| psllq mm0, 16 //$16,%%mm0 |
| por mm0, mm1 //%%mm1,%%mm0 // mm0 = vol|vol|vol|vol |
| |
| #ifndef __WATCOMC__ |
| align 16 |
| #endif |
| mixloopS16: |
| movq mm1, [esi] //(%%esi),%%mm1\n" // mm1 = a|b|c|d |
| movq mm2, mm1 //%%mm1,%%mm2\n" // mm2 = a|b|c|d |
| movq mm4, [esi + 8] //8(%%esi),%%mm4\n" // mm4 = e|f|g|h |
| // pre charger le buffer dst dans mm7 |
| movq mm7, [edi] //(%%edi),%%mm7\n" // mm7 = dst[0]" |
| // multiplier par le volume |
| pmullw mm1, mm0 //%%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v) |
| pmulhw mm2, mm0 //%%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v) |
| movq mm5, mm4 //%%mm4,%%mm5\n" // mm5 = e|f|g|h |
| pmullw mm4, mm0 //%%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v) |
| pmulhw mm5, mm0 //%%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v) |
| movq mm3, mm1 //%%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v) |
| punpckhwd mm1, mm2 //%%mm2,%%mm1\n" // mm1 = a*v|b*v |
| movq mm6, mm4 //%%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v) |
| punpcklwd mm3, mm2 //%%mm2,%%mm3\n" // mm3 = c*v|d*v |
| punpckhwd mm4, mm5 //%%mm5,%%mm4\n" // mm4 = e*f|f*v |
| punpcklwd mm6, mm5 //%%mm5,%%mm6\n" // mm6 = g*v|h*v |
| // pre charger le buffer dst dans mm5 |
| movq mm5, [edi + 8] //8(%%edi),%%mm5\n" // mm5 = dst[1] |
| // diviser par 128 |
| psrad mm1, 7 //$7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME |
| add esi, 16 //$16,%%esi\n" |
| psrad mm3, 7 //$7,%%mm3\n" // mm3 = c*v/128|d*v/128 |
| psrad mm4, 7 //$7,%%mm4\n" // mm4 = e*v/128|f*v/128 |
| // mm1 = le sample avec le volume modifie |
| packssdw mm3, mm1 //%%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v) |
| psrad mm6, 7 //$7,%%mm6\n" // mm6= g*v/128|h*v/128 |
| paddsw mm3, mm7 //%%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst |
| // mm4 = le sample avec le volume modifie |
| packssdw mm6, mm4 //%%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v) |
| movq [edi], mm3 //%%mm3,(%%edi)\n" |
| paddsw mm6, mm5 //%%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst |
| movq [edi + 8], mm6 //%%mm6,8(%%edi)\n" |
| add edi, 16 //$16,%%edi\n" |
| dec ebx //%%ebx\n" |
| jnz mixloopS16 |
| |
| endS16: |
| emms |
| |
| pop ebx |
| pop esi |
| pop edi |
| } |
| |
| } |
| |
| //////////////////////////////////////////////// |
| // Mixing for 8 bit signed buffers |
| //////////////////////////////////////////////// |
| |
| void SDL_MixAudio_MMX_S8_VC(char* dst,char* src,unsigned int nSize,int volume) |
| { |
| _asm |
| { |
| |
| push edi |
| push esi |
| push ebx |
| |
| mov edi, dst //movl %0,%%edi // edi = dst |
| mov esi, src //%1,%%esi // esi = src |
| mov eax, volume //%3,%%eax // eax = volume |
| |
| movd mm0, eax //%%eax,%%mm0 |
| movq mm1, mm0 //%%mm0,%%mm1 |
| psllq mm0, 16 //$16,%%mm0 |
| por mm0, mm1 //%%mm1,%%mm0 |
| psllq mm0, 16 //$16,%%mm0 |
| por mm0, mm1 //%%mm1,%%mm0 |
| psllq mm0, 16 //$16,%%mm0 |
| por mm0, mm1 //%%mm1,%%mm0 |
| |
| mov ebx, nSize //%2,%%ebx // ebx = size |
| shr ebx, 3 //$3,%%ebx // process 8 bytes per iteration = 8 samples |
| cmp ebx, 0 //$0,%%ebx |
| je endS8 |
| |
| #ifndef __WATCOMC__ |
| align 16 |
| #endif |
| mixloopS8: |
| pxor mm2, mm2 //%%mm2,%%mm2 // mm2 = 0 |
| movq mm1, [esi] //(%%esi),%%mm1 // mm1 = a|b|c|d|e|f|g|h |
| movq mm3, mm1 //%%mm1,%%mm3 // mm3 = a|b|c|d|e|f|g|h |
| // on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0 |
| pcmpgtb mm2, mm1 //%%mm1,%%mm2 // mm2 = 11111111|00000000|00000000.... |
| punpckhbw mm1, mm2 //%%mm2,%%mm1 // mm1 = 0|a|0|b|0|c|0|d |
| punpcklbw mm3, mm2 //%%mm2,%%mm3 // mm3 = 0|e|0|f|0|g|0|h |
| movq mm2, [edi] //(%%edi),%%mm2 // mm2 = destination |
| pmullw mm1, mm0 //%%mm0,%%mm1 // mm1 = v*a|v*b|v*c|v*d |
| add esi, 8 //$8,%%esi |
| pmullw mm3, mm0 //%%mm0,%%mm3 // mm3 = v*e|v*f|v*g|v*h |
| psraw mm1, 7 //$7,%%mm1 // mm1 = v*a/128|v*b/128|v*c/128|v*d/128 |
| psraw mm3, 7 //$7,%%mm3 // mm3 = v*e/128|v*f/128|v*g/128|v*h/128 |
| 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 |
| paddsb mm3, mm2 //%%mm2,%%mm3 // add to destination buffer |
| movq [edi], mm3 //%%mm3,(%%edi) // store back to ram |
| add edi, 8 //$8,%%edi |
| dec ebx //%%ebx |
| jnz mixloopS8 |
| |
| endS8: |
| emms |
| |
| pop ebx |
| pop esi |
| pop edi |
| } |
| } |
| |
| #endif /* SDL_ASSEMBLY_ROUTINES */ |
| #endif /* SDL_BUGGY_MMX_MIXERS */ |