Mercurial > sdl-ios-xcode

view src/audio/SDL_mixer_MMX.c @ 3978:b966761fef6c SDL-1.2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Significantly improved XIM support. Fixes Bugzilla #429. Selected notes from the patch's README: = FIXES = This patch fixes the above issues as follows. == X11 events == Moved XFilterEvent just after XNextEvent so that all events are passed to it. Also, XFilterEvent will receive masks indicated by IM through XNFilterEvents IC value as well as masks surpplied by SDL. X11_KeyRepeat is called between XNextEvent and XFilterEvent, after testing an event is a KeyRelease. I'm not 100% comfortable to do so, but I couldn't find a better timing to call it, and use of the function is inevitable. == Xutf8LookupString == Used a longer buffer to receive UTF-8 string. If it is insufficient, a dynamic storage of the requested size will be allocated. The initial size of the buffer is set to 32, because the Japanese text converted from the most widely used benchmark key sequence for Japanese IM, "WATASHINONAMAEHANAKANODESU." has ten Japanese characters in it, that occupies 30 bytes when encoded in UTF-8. == SDL_keysym.unicode == On Windows version of SDL implementation, SDL_keysym.unicode stores UTF-16 encoded unicode characters, one UTF-16 encoding unit per an SDL event. A Unicode supplementary characters are sent to an application as two events. (One with a high surrogate and another with a low surrogate.) The behavior seems reasonable since it is upward compatible with existing handling of BMP characters. I wrote a UTF-8 to UTF-16 conversion function for the purpose. It is designed with the execution speed in mind, having a minimum set of features that my patch requires.
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 25 Jun 2007 19:58:32 +0000
parents 97d0966f4bf7
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 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