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view src/audio/SDL_mixer_MMX.c @ 2992:dbff5769d742

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The core pointer is comprised of merging the inputs of all mice. If there are other mice, they should show up in the device list, and we want to report events from those devices instead of the core events. However, if XInput isn't supported or we can't find other mice in the device list, we'll add the core pointer and interpret normal mouse events.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2009 18:29:20 +0000
parents 99210400e8b9
children 4d46850be3f6
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 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"

/*
    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)
    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
***********************************************/

#if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES)
void
SDL_MixAudio_MMX_S16(char *dst, char *src, unsigned int size, int volume)
{
    __asm__ __volatile__("	movl %3,%%eax\n"        /* eax = volume */
                         "	movl %2,%%edx\n"        /* edx = size */
                         "	shrl $4,%%edx\n"        /* process 16 bytes per iteration = 8 samples */
                         "	jz .endS16\n" "	pxor %%mm0,%%mm0\n" "	movd %%eax,%%mm0\n" "	movq %%mm0,%%mm1\n" "	psllq $16,%%mm0\n" "	por %%mm1,%%mm0\n" "	psllq $16,%%mm0\n" "	por %%mm1,%%mm0\n" "	psllq $16,%%mm0\n" "	por %%mm1,%%mm0\n"      /* mm0 = vol|vol|vol|vol */
                         ".align 8\n" "	.mixloopS16:\n" "	movq (%1),%%mm1\n"      /* mm1 = a|b|c|d */
                         "	movq %%mm1,%%mm2\n"     /* mm2 = a|b|c|d */
                         "	movq 8(%1),%%mm4\n"     /* mm4 = e|f|g|h */
                         /* pré charger le buffer dst dans mm7 */
                         "	movq (%0),%%mm7\n"      /* mm7 = dst[0] */
                         /* multiplier par le volume */
                         "	pmullw %%mm0,%%mm1\n"   /* mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */
                         "	pmulhw %%mm0,%%mm2\n"   /* mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v) */
                         "	movq %%mm4,%%mm5\n"     /* mm5 = e|f|g|h */
                         "	pmullw %%mm0,%%mm4\n"   /* mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */
                         "	pmulhw %%mm0,%%mm5\n"   /* mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v) */
                         "	movq %%mm1,%%mm3\n"     /* mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */
                         "	punpckhwd %%mm2,%%mm1\n"        /* mm1 = a*v|b*v */
                         "	movq %%mm4,%%mm6\n"     /* mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */
                         "	punpcklwd %%mm2,%%mm3\n"        /* mm3 = c*v|d*v */
                         "	punpckhwd %%mm5,%%mm4\n"        /* mm4 = e*f|f*v */
                         "	punpcklwd %%mm5,%%mm6\n"        /* mm6 = g*v|h*v */
                         /* pré charger le buffer dst dans mm5 */
                         "	movq 8(%0),%%mm5\n"     /* mm5 = dst[1] */
                         /* diviser par 128 */
                         "	psrad $7,%%mm1\n"       /* mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME */
                         "	add $16,%1\n" "	psrad $7,%%mm3\n"       /* mm3 = c*v/128|d*v/128 */
                         "	psrad $7,%%mm4\n"       /* mm4 = e*v/128|f*v/128 */
                         /* mm1 = le sample avec le volume modifié */
                         "	packssdw %%mm1,%%mm3\n" /* mm3 = s(a*v|b*v|c*v|d*v) */
                         "	psrad $7,%%mm6\n"       /* mm6= g*v/128|h*v/128 */
                         "	paddsw %%mm7,%%mm3\n"   /* mm3 = adjust_volume(src)+dst */
                         /* mm4 = le sample avec le volume modifié */
                         "	packssdw %%mm4,%%mm6\n" /* mm6 = s(e*v|f*v|g*v|h*v) */
                         "	movq %%mm3,(%0)\n" "	paddsw %%mm5,%%mm6\n"   /* mm6 = adjust_volume(src)+dst */
                         "	movq %%mm6,8(%0)\n"
                         "	add $16,%0\n"
                         "	dec %%edx\n"
                         "	jnz .mixloopS16\n"
                         "	emms\n"
                         ".endS16:\n"::"r"(dst), "r"(src),
                         "m"(size), "m"(volume):"eax", "edx", "memory");
}



/*////////////////////////////////////////////// */
/* Mixing for 8 bit signed buffers */
/*////////////////////////////////////////////// */

void
SDL_MixAudio_MMX_S8(char *dst, char *src, unsigned int size, int volume)
{
    __asm__ __volatile__("	movl %3,%%eax\n"        /* eax = volume */
                         "	movd %%eax,%%mm0\n" "	movq %%mm0,%%mm1\n" "	psllq $16,%%mm0\n" "	por %%mm1,%%mm0\n" "	psllq $16,%%mm0\n" "	por %%mm1,%%mm0\n" "	psllq $16,%%mm0\n" "	por %%mm1,%%mm0\n" "	movl %2,%%edx\n"        /* edx = size */
                         "	shr $3,%%edx\n" /* process 8 bytes per iteration = 8 samples */
                         "	cmp $0,%%edx\n" "	je .endS8\n" ".align 8\n" "	.mixloopS8:\n" "	pxor %%mm2,%%mm2\n"     /* mm2 = 0 */
                         "	movq (%1),%%mm1\n"      /* mm1 = a|b|c|d|e|f|g|h */
                         "	movq %%mm1,%%mm3\n"     /* 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 %%mm1,%%mm2\n"  /* mm2 = 11111111|00000000|00000000.... */
                         "	punpckhbw %%mm2,%%mm1\n"        /* mm1 = 0|a|0|b|0|c|0|d */
                         "	punpcklbw %%mm2,%%mm3\n"        /* mm3 = 0|e|0|f|0|g|0|h */
                         "	movq (%0),%%mm2\n"      /* mm2 = destination */
                         "	pmullw %%mm0,%%mm1\n"   /* mm1 = v*a|v*b|v*c|v*d */
                         "	add $8,%1\n" "	pmullw %%mm0,%%mm3\n"   /* mm3 = v*e|v*f|v*g|v*h */
                         "	psraw $7,%%mm1\n"       /* mm1 = v*a/128|v*b/128|v*c/128|v*d/128  */
                         "	psraw $7,%%mm3\n"       /* mm3 = v*e/128|v*f/128|v*g/128|v*h/128 */
                         "	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 */
                         "	paddsb %%mm2,%%mm3\n"   /* add to destination buffer */
                         "	movq %%mm3,(%0)\n"      /* store back to ram */
                         "	add $8,%0\n"
                         "	dec %%edx\n"
                         "	jnz .mixloopS8\n"
                         ".endS8:\n"
                         "	emms\n"::"r"(dst), "r"(src), "m"(size),
                         "m"(volume):"eax", "edx", "memory");
}
#endif
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