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view src/video/ataricommon/SDL_ataric2p.S @ 3846:66fb40445587 SDL-ryan-multiple-audio-device

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Removed distinction between "available" and "init" in audio backends, since both had to be checked for success as a pair at the higher level and several of the Available methods were just always-succeed placeholders anyhow. Now the availability check is done in the init code, and the higher level tries all possible drivers until one manages to initialize successfully.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 17 Oct 2006 09:09:21 +0000
parents c9b51268668f
children 99210400e8b9
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
*/

/*
	Chunky to planar conversion routine
	1 byte/pixel -> 4 or 8 bit planes

	Patrice Mandin
	Xavier Joubert
	Mikael Kalms
*/

	.globl	_SDL_Atari_C2pConvert
	.globl	_SDL_Atari_C2pConvert8
	.globl	_SDL_Atari_C2pConvert4
	.globl	_SDL_Atari_C2pConvert4_pal

/* ------------	Conversion C2P, 8 bits ------------ */

	.text
_SDL_Atari_C2pConvert8:
	movel	sp@(4),c2p_source
	movel	sp@(8),c2p_dest
	movel	sp@(12),c2p_width
	movel	sp@(16),c2p_height
	movel	sp@(20),c2p_dblligne
	movel	sp@(24),c2p_srcpitch
	movel	sp@(28),c2p_dstpitch

	moveml	d2-d7/a2-a6,sp@-

	movel	c2p_source,c2p_cursrc
	movel	c2p_dest,c2p_curdst
	movel	#0x0f0f0f0f,d4
	movel	#0x00ff00ff,d5
	movel	#0x55555555,d6
	movew	c2p_height+2,c2p_row
	movew	c2p_width+2,d0
	andw	#-8,d0
	movew	d0,c2p_rowlen

SDL_Atari_C2p8_rowloop:

	movel	c2p_cursrc,a0
	movel	c2p_curdst,a1

	movel	a0,a2
	addw	c2p_rowlen,a2

	movel	a0@+,d0
	movel	a0@+,d1
	movel	a0@+,d2
	movel	a0@+,d3
/*
	d0 = a7a6a5a4a3a2a1a0 b7b6b5b4b3b2b1b0 c7c6c5c4c3c2c1c0 d7d6d5d4d3d2d1d0
	d1 = e7e6e5e4e3e2e1e0 f7f6f5f4f3f2f1f0 g7g6g5g4g3g2g1g0 h7h6h5h4h3h2h1h0
	d2 = i7i6i5i4i3i2i1i0 j7j6j5j4j3j2j1j0 k7k6k5k4k3k2k1k0 l7l6l5l4l3l2l1l0
	d3 = m7m6m5m4m3m2m1m0 n7n6n5n4n3n2n1n0 o7o6o5o4o3o2o1o0 p7p6p5p4p3p2p1p0
*/
	movel	d1,d7
	lsrl	#4,d7
	eorl	d0,d7
	andl	d4,d7
	eorl	d7,d0
	lsll	#4,d7
	eorl	d7,d1

	movel	d3,d7
	lsrl	#4,d7
	eorl	d2,d7
	andl	d4,d7
	eorl	d7,d2
	lsll	#4,d7
	eorl	d7,d3

	movel	d2,d7
	lsrl	#8,d7
	eorl	d0,d7
 	andl	d5,d7
	eorl	d7,d0
	lsll	#8,d7
	eorl	d7,d2

	movel	d3,d7
	lsrl	#8,d7
	eorl	d1,d7
 	andl	d5,d7
	eorl	d7,d1
	lsll	#8,d7
	eorl	d7,d3
/*
	d0 = a7a6a5a4e7e6e5e4 i7i6i5i4m7m6m5m4 c7c6c5c4g7g6g5g4 k7k6k5k4o7o6o5o4
	d1 = a3a2a1a0e3e2e1e0 i3i2i1i0m3m2m1m0 c3c2c1c0g3g2g1g0 k3k2k1k0o3o2o1o0
	d2 = b7b6b5b4f7f6f5f4 j7j6j5j4n7n6n5n4 d7d6d5d4h7h6h5h4 l7l6l5l4p7p6p5p4
	d3 = b3b2b1b0f3f2f1f0 j3j2j1j0n3n2n1n0 d3d2d1d0h3h2h1h0 l3l2l1l0p3p2p1p0
*/
	bras	SDL_Atari_C2p8_start

SDL_Atari_C2p8_pix16:

	movel	a0@+,d0
	movel	a0@+,d1
	movel	a0@+,d2
	movel	a0@+,d3
/*
	d0 = a7a6a5a4a3a2a1a0 b7b6b5b4b3b2b1b0 c7c6c5c4c3c2c1c0 d7d6d5d4d3d2d1d0
	d1 = e7e6e5e4e3e2e1e0 f7f6f5f4f3f2f1f0 g7g6g5g4g3g2g1g0 h7h6h5h4h3h2h1h0
	d2 = i7i6i5i4i3i2i1i0 j7j6j5j4j3j2j1j0 k7k6k5k4k3k2k1k0 l7l6l5l4l3l2l1l0
	d3 = m7m6m5m4m3m2m1m0 n7n6n5n4n3n2n1n0 o7o6o5o4o3o2o1o0 p7p6p5p4p3p2p1p0
*/
	movel	d1,d7
	lsrl	#4,d7
	movel	a3,a1@+
	eorl	d0,d7
	andl	d4,d7
	eorl	d7,d0
	lsll	#4,d7
	eorl	d7,d1

	movel	d3,d7
	lsrl	#4,d7
	eorl	d2,d7
	andl	d4,d7
	eorl	d7,d2
	movel	a4,a1@+
	lsll	#4,d7
	eorl	d7,d3

	movel	d2,d7
	lsrl	#8,d7
	eorl	d0,d7
	andl	d5,d7
	eorl	d7,d0
	movel	a5,a1@+
	lsll	#8,d7
	eorl	d7,d2

	movel	d3,d7
	lsrl	#8,d7
	eorl	d1,d7
	andl	d5,d7
	eorl	d7,d1
	movel	a6,a1@+
	lsll	#8,d7
	eorl	d7,d3
/*
	d0 = a7a6a5a4e7e6e5e4 i7i6i5i4m7m6m5m4 c7c6c5c4g7g6g5g4 k7k6k5k4o7o6o5o4
	d1 = a3a2a1a0e3e2e1e0 i3i2i1i0m3m2m1m0 c3c2c1c0g3g2g1g0 k3k2k1k0o3o2o1o0
	d2 = b7b6b5b4f7f6f5f4 j7j6j5j4n7n6n5n4 d7d6d5d4h7h6h5h4 l7l6l5l4p7p6p5p4
	d3 = b3b2b1b0f3f2f1f0 j3j2j1j0n3n2n1n0 d3d2d1d0h3h2h1h0 l3l2l1l0p3p2p1p0
*/

SDL_Atari_C2p8_start:

	movel	d2,d7
	lsrl	#1,d7
	eorl	d0,d7
	andl	d6,d7
	eorl	d7,d0
	addl	d7,d7
	eorl	d7,d2

	movel	d3,d7
	lsrl	#1,d7
	eorl	d1,d7
	andl	d6,d7
	eorl	d7,d1
	addl	d7,d7
	eorl	d7,d3
/*
	d0 = a7b7a5b5e7f7e5f5 i7j7i5j5m7n7m5n5 c7d7c5d5g7h7g5h5 k7l7k5l5o7p7o5p5
	d1 = a3b3a1b1e3f3e1f1 i3j3i1j1m3n3m1n1 c3d3c1d1g3h3g1h1 k3l3k1l1o3p3o1p1
	d2 = a6b6a4b4e6f6e4f4 i6j6i4j4m6n6m4n4 c6d6c4d4g6h6g4h4 k6l6k4l4o6p6o4p4
	d3 = a2b2a0b0e2f2e0f0 i2j2i0j0m2n2m0n0 c2d2c0d0g2h2g0h0 k2l2k0l0o2p2o0p0
*/
	movew	d2,d7
	movew	d0,d2
	swap	d2
	movew	d2,d0
	movew	d7,d2

	movew	d3,d7
	movew	d1,d3
	swap	d3
	movew	d3,d1
	movew	d7,d3
/*
	d0 = a7b7a5b5e7f7e5f5 i7j7i5j5m7n7m5n5 a6b6a4b4e6f6e4f4 i6j6i4j4m6n6m4n4
	d1 = a3b3a1b1e3f3e1f1 i3j3i1j1m3n3m1n1 a2b2a0b0e2f2e0f0 i2j2i0j0m2n2m0n0
	d2 = c7d7c5d5g7h7g5h5 k7l7k5l5o7p7o5p5 c6d6c4d4g6h6g4h4 k6l6k4l4o6p6o4p4
	d3 = c3d3c1d1g3h3g1h1 k3l3k1l1o3p3o1p1 c2d2c0d0g2h2g0h0 k2l2k0l0o2p2o0p0
*/
	movel	d2,d7
	lsrl	#2,d7
	eorl	d0,d7
	andl	#0x33333333,d7
	eorl	d7,d0
	lsll	#2,d7
	eorl	d7,d2

	movel	d3,d7
	lsrl	#2,d7
	eorl	d1,d7
	andl	#0x33333333,d7
	eorl	d7,d1
	lsll	#2,d7
	eorl	d7,d3
/*
	d0 = a7b7c7d7e7f7g7h7 i7j7k7l7m7n7o7p7 a6b6c6d6e6f6g6h6 i6j6k6l6m6n6o6p6
	d1 = a3b3c3d3e3f3g3h3 i3j3k3l3m3n3o3p3 a2b2c2d2e2f2g2h2 i2j2k2l2m2n2o2p2
	d2 = a5b5c5d5e5f5g5h5 i5j5k5l5m5n5o5p5 a4b4c4d4e4f4g4h4 i4j4k4l4m4n4o4p4
	d3 = a1b1c1d1e1f1g1h1 i1j1k1l1m1n1o1p1 a0b0c0d0e0f0g0h0 i0j0k0l0m0n0o0p0
*/
	swap	d0
	swap	d1
	swap	d2
	swap	d3

	movel	d0,a6
	movel	d2,a5
	movel	d1,a4
	movel	d3,a3

	cmpl	a0,a2
	bgt		SDL_Atari_C2p8_pix16

	movel	a3,a1@+
	movel	a4,a1@+
	movel	a5,a1@+
	movel	a6,a1@+

	/* Double the line ? */

	movel	c2p_srcpitch,d0
	movel	c2p_dstpitch,d1

	tstl	c2p_dblligne
	beqs	SDL_Atari_C2p8_nodblline

	movel	c2p_curdst,a0
	movel	a0,a1
	addl	d1,a1

	movew	c2p_width+2,d7
	lsrw	#4,d7
	subql	#1,d7
SDL_Atari_C2p8_dblloop:
	movel	a0@+,a1@+
	movel	a0@+,a1@+
	movel	a0@+,a1@+
	movel	a0@+,a1@+
	dbra	d7,SDL_Atari_C2p8_dblloop

	addl	d1,c2p_curdst

SDL_Atari_C2p8_nodblline:

	/* Next line */

	addl	d0,c2p_cursrc
	addl	d1,c2p_curdst

	subqw	#1,c2p_row
	bne		SDL_Atari_C2p8_rowloop	

	moveml	sp@+,d2-d7/a2-a6
	rts

/* ------------	Conversion C2P, 4 bits ------------ */

_SDL_Atari_C2pConvert4:
	movel	sp@(4),c2p_source
	movel	sp@(8),c2p_dest
	movel	sp@(12),c2p_width
	movel	sp@(16),c2p_height
	movel	sp@(20),c2p_dblligne
	movel	sp@(24),c2p_srcpitch
	movel	sp@(28),c2p_dstpitch

	moveml	d2-d7/a2-a6,sp@-

	movel	c2p_source,a0
	movel	c2p_dest,a1
	lea	_SDL_Atari_table_c2p,a2
	movel	#0x00070001,d3
#if defined(__M68020__)
	moveq	#0,d0
#endif
	
	movel	c2p_height,d7
	subql	#1,d7
c2p4_bcly:
	movel	a0,a4	| Save start address of source
	movel	a1,a5	| Save start address of dest

	| Conversion
                 			
	movel	c2p_width,d6
	lsrw	#4,d6
	subql	#1,d6
c2p4_bclx:
	| Octets 0-7
	
	moveq	#0,d1
	moveq	#7,d5
c2p4_bcl07:
#if defined(__M68020__)
	moveb	a0@+,d0
	lea		a2@(0,d0:w:4),a3
#else
	moveq	#0,d0
	moveb	a0@+,d0
	lslw	#2,d0
	lea		a2@(0,d0:w),a3
#endif
	lsll	#1,d1
	orl		a3@,d1
	dbra	d5,c2p4_bcl07

	movepl	d1,a1@(0)
	addw	d3,a1
	swap	d3
	
	| Octets 8-15

	moveq	#0,d1
	moveq	#7,d5
c2p4_bcl815:
#if defined(__M68020__)
	moveb	a0@+,d0
	lea		a2@(0,d0:w:4),a3
#else
	moveq	#0,d0
	moveb	a0@+,d0
	lslw	#2,d0
	lea		a2@(0,d0:w),a3
#endif
	lsll	#1,d1
	orl		a3@,d1
	dbra	d5,c2p4_bcl815

	movepl	d1,a1@(0)
	addw	d3,a1
	swap	d3

	dbra	d6,c2p4_bclx

	| Double line ?

	tstl	c2p_dblligne
	beqs	c2p4_nodblligne

	movel	a5,a6			| src line
	movel	a5,a1			| dest line
	addl	c2p_dstpitch,a1

	movel	c2p_width,d6
	lsrw	#3,d6
	subql	#1,d6
c2p4_copydbl:
	movel	a6@+,a1@+
	dbra	d6,c2p4_copydbl

	addl	c2p_dstpitch,a5
c2p4_nodblligne:

	| Next line

	movel	a4,a0		
	addl	c2p_srcpitch,a0
	movel	a5,a1
	addl	c2p_dstpitch,a1

	dbra	d7,c2p4_bcly

	moveml	sp@+,d2-d7/a2-a6
	rts

/* ------------	Conversion of a light palette in 4 bits ------------ */

_SDL_Atari_C2pConvert4_pal:
	/* a0 is a 256-word light palette */
	movel	sp@(4),a0

	moveml	d2-d3,sp@-

	lea		_SDL_Atari_table_c2p,a1
	movew	#255,d3
c2p_pal_initbcl:
	movew	a0@+,d0
	lsrw	#4,d0
	andw	#15,d0

	moveq	#3,d1
c2p_pal_initbyte:
	btst	d1,d0
	sne		d2
	negw	d2
	moveb	d2,a1@(0,d1:w)

	dbra	d1,c2p_pal_initbyte

	addql	#4,a1
	dbra	d3,c2p_pal_initbcl

	moveml	sp@+,d2-d3

	rts

/* ------------	Buffers ------------ */

	.bss

	.even
	.comm	_SDL_Atari_C2pConvert,4
	.comm	_SDL_Atari_table_c2p,1024

	.comm	c2p_source,4	/* Source framebuffer */
	.comm	c2p_dest,4		/* Destination framebuffer */
	.comm	c2p_width,4		/* Width of zone to convert */
	.comm	c2p_height,4	/* Height of zone to convert */
	.comm	c2p_dblligne,4	/* Double the lines while converting ? */
	.comm	c2p_srcpitch,4	/* Source pitch */
	.comm	c2p_dstpitch,4	/* Destination pitch */
	.comm	c2p_cursrc,4	/* Current source line */
	.comm	c2p_curdst,4	/* Current destination line */
	.comm	c2p_rowlen,2	/* Line length in bytes */
	.comm	c2p_row,2		/* Current line number */