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Date: Mon, 17 Jan 2005 20:54:50 +0200 From: Ville [snip] Subject: [PATCH] SDL/DirectFB: remove Matrox CRTC2 flicker filter Hi, This patch removes the flicker filter option from the DirectFB backend's Matrox CRTC2 code in SDL. I will be removing the option from DirectFB (because it doesn't actually work) and that would cause the SDL code to fail without this fix. I was going to send this to some SDL list directly but libsdl.org is down so I'm not sure what if any lists there are. Thomas Jarosch (the guy who wrote the code) said you would accept SDL patches. Let me know if I should send this somewhere else. -- Ville Syrj�l� syrjala _at sci.fi http://www.sci.fi/~syrjala/
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 17 Jan 2005 19:38:28 +0000
parents b8d311d90021
children d910939febfa
line wrap: on
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

/*
	m68k assembly mix routines

	Patrice Mandin
*/

#if defined(__M68000__) && defined(__GNUC__)
void SDL_MixAudio_m68k_U8(char* dst, char* src, long len, long volume, char* mix8)
{
    __asm__ __volatile__ (

	"tstl	%2\n"
"	beqs	stoploop_u8\n"
"mixloop_u8:\n"

	/* Mix a sample */

"	moveq	#0,%%d0\n"
"	moveq	#0,%%d1\n"

"	moveb	%1@+,%%d0\n"	/* d0 = *src++ */
"	sub	#128,%%d0\n"	/* d0 -= 128 */
"	muls	%3,%%d0\n"	/* d0 *= volume (0<=volume<=128) */
"	moveb	%0@,%%d1\n"	/* d1 = *dst */
"	asr	#7,%%d0\n"	/* d0 /= 128 (SDL_MIX_MAXVOLUME) */
"	add	#128,%%d0\n"	/* d0 += 128 */

"	add	%%d1,%%d0\n"

"	moveb	%4@(%%d0:w),%0@+\n"

	/* Loop till done */

"	subql	#1,%2\n"
"	bhis	mixloop_u8\n"
"stoploop_u8:\n"

	 : /* no return value */
	 : /* input */
	 	"a"(dst), "a"(src), "d"(len), "d"(volume), "a"(mix8)	
	 : /* clobbered registers */
	 	"d0", "d1", "cc", "memory" 
	 );
}

void SDL_MixAudio_m68k_S8(char* dst, char* src, long len, long volume)
{
    __asm__ __volatile__ (

	"tstl	%2\n"
"	beqs	stoploop_s8\n"
"	moveq	#-128,%%d2\n"
"	moveq	#127,%%d3\n"
"mixloop_s8:\n"

	/* Mix a sample */

"	moveq	#0,%%d0\n"
"	moveq	#0,%%d1\n"

"	moveb	%1@+,%%d0\n"	/* d0 = *src++ */
"	muls	%3,%%d0\n"	/* d0 *= volume (0<=volume<=128) */
"	moveb	%0@,%%d1\n"	/* d1 = *dst */
"	asr	#7,%%d0\n"	/* d0 /= 128 (SDL_MIX_MAXVOLUME) */

"	add	%%d1,%%d0\n"

"	cmp	%%d2,%%d0\n"
"	bges	lower_limit_s8\n"
"	move	%%d2,%%d0\n"
"lower_limit_s8:\n"

"	cmp	%%d3,%%d0\n"
"	bles	upper_limit_s8\n"
"	move	%%d3,%%d0\n"
"upper_limit_s8:\n"
"	moveb	%%d0,%0@+\n"

	/* Loop till done */

"	subql	#1,%2\n"
"	bhis	mixloop_s8\n"
"stoploop_s8:\n"

	 : /* no return value */
	 : /* input */
	 	"a"(dst), "a"(src), "d"(len), "d"(volume)	
	 : /* clobbered registers */
	 	"d0", "d1", "d2", "d3", "cc", "memory" 
	 );
}

void SDL_MixAudio_m68k_S16MSB(short* dst, short* src, long len, long volume)
{
    __asm__ __volatile__ (

	"tstl	%2\n"
"	beqs	stoploop_s16msb\n"
"	movel	#-32768,%%d2\n"
"	movel	#32767,%%d3\n"
"	lsrl	#1,%2\n"
"mixloop_s16msb:\n"

	/* Mix a sample */

"	move	%1@+,%%d0\n"	/* d0 = *src++ */
"	muls	%3,%%d0\n"	/* d0 *= volume (0<=volume<=128) */
"	move	%0@,%%d1\n"	/* d1 = *dst */
"	extl	%%d1\n"		/* extend d1 to 32 bits */
"	asrl	#7,%%d0\n"	/* d0 /= 128 (SDL_MIX_MAXVOLUME) */

"	addl	%%d1,%%d0\n"

"	cmpl	%%d2,%%d0\n"
"	bges	lower_limit_s16msb\n"
"	move	%%d2,%%d0\n"
"lower_limit_s16msb:\n"

"	cmpl	%%d3,%%d0\n"
"	bles	upper_limit_s16msb\n"
"	move	%%d3,%%d0\n"
"upper_limit_s16msb:\n"
"	move	%%d0,%0@+\n"

	/* Loop till done */

"	subql	#1,%2\n"
"	bhis	mixloop_s16msb\n"
"stoploop_s16msb:\n"

	 : /* no return value */
	 : /* input */
	 	"a"(dst), "a"(src), "d"(len), "d"(volume)	
	 : /* clobbered registers */
	 	"d0", "d1", "d2", "d3", "cc", "memory" 
	 );
}

void SDL_MixAudio_m68k_S16LSB(short* dst, short* src, long len, long volume)
{
    __asm__ __volatile__ (

	"tstl	%2\n"
"	beqs	stoploop_s16lsb\n"
"	movel	#-32768,%%d2\n"
"	movel	#32767,%%d3\n"
"	lsrl	#1,%2\n"
"mixloop_s16lsb:\n"

	/* Mix a sample */

"	move	%1@+,%%d0\n"	/* d0 = *src++ */
"	rorw	#8,%%d0\n"
"	muls	%3,%%d0\n"	/* d0 *= volume (0<=volume<=128) */
"	move	%0@,%%d1\n"	/* d1 = *dst */
"	rorw	#8,%%d1\n"
"	extl	%%d1\n"		/* extend d1 to 32 bits */
"	asrl	#7,%%d0\n"	/* d0 /= 128 (SDL_MIX_MAXVOLUME) */

"	addl	%%d1,%%d0\n"

"	cmpl	%%d2,%%d0\n"
"	bges	lower_limit_s16lsb\n"
"	move	%%d2,%%d0\n"
"lower_limit_s16lsb:\n"

"	cmpl	%%d3,%%d0\n"
"	bles	upper_limit_s16lsb\n"
"	move	%%d3,%%d0\n"
"upper_limit_s16lsb:\n"
"	rorw	#8,%%d0\n"
"	move	%%d0,%0@+\n"

	/* Loop till done */

"	subql	#1,%2\n"
"	bhis	mixloop_s16lsb\n"
"stoploop_s16lsb:\n"

	 : /* no return value */
	 : /* input */
	 	"a"(dst), "a"(src), "d"(len), "d"(volume)	
	 : /* clobbered registers */
	 	"d0", "d1", "d2", "d3", "cc", "memory" 
	 );
}
#endif