diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/audio/SDL_mixer_MMX_VC.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/audio/SDL_mixer_MMX_VC.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/audio/SDL_mixer_MMX_VC.c b/distrib/sdl-1.2.15/src/audio/SDL_mixer_MMX_VC.c new file mode 100644 index 0000000..cd0aa4c --- /dev/null +++ b/distrib/sdl-1.2.15/src/audio/SDL_mixer_MMX_VC.c @@ -0,0 +1,183 @@ +/* + 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 */ |