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