src/audio/SDL_mixer_MMX_VC.c
author Ryan C. Gordon
Sun, 10 Jan 2010 07:48:14 +0000
changeset 3628 4d46850be3f6
parent 2859 99210400e8b9
child 3697 f7b03b6838cb
permissions -rw-r--r--
Merged r5070:5071 from branches/SDL-1.2: forcibly disable buggy MMX mixers.
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2009 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Lesser General Public License for more details.
    14 
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with this library; if not, write to the Free Software
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 #include "SDL_config.h"
    23 
    24 #include "SDL_mixer_MMX_VC.h"
    25 
    26 #if defined(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */
    27 #if ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES)
    28 // MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples
    29 // Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr)
    30 // Converted to Intel ASM notation by Cth
    31 // This code is licensed under the LGPL (see COPYING for details)
    32 // 
    33 // Assumes buffer size in bytes is a multiple of 16
    34 // Assumes SDL_MIX_MAXVOLUME = 128
    35 
    36 
    37 ////////////////////////////////////////////////
    38 // Mixing for 16 bit signed buffers
    39 ////////////////////////////////////////////////
    40 
    41 void
    42 SDL_MixAudio_MMX_S16_VC(char *dst, char *src, unsigned int nSize, int volume)
    43 {
    44     /* *INDENT-OFF* */
    45 	__asm
    46 	{
    47 
    48 		push	edi
    49 		push	esi
    50 		push	ebx
    51 		
    52 		mov		edi, dst		// edi = dst
    53 		mov		esi, src		// esi = src
    54 		mov		eax, volume		// eax = volume
    55 		mov		ebx, nSize		// ebx = size
    56 		shr		ebx, 4			// process 16 bytes per iteration = 8 samples
    57 		jz		endS16
    58 		
    59 		pxor	mm0, mm0
    60 		movd	mm0, eax		//%%eax,%%mm0
    61 		movq	mm1, mm0		//%%mm0,%%mm1
    62 		psllq	mm0, 16			//$16,%%mm0
    63 		por		mm0, mm1		//%%mm1,%%mm0
    64 		psllq	mm0, 16			//$16,%%mm0
    65 		por		mm0, mm1		//%%mm1,%%mm0
    66 		psllq	mm0, 16			//$16,%%mm0
    67 		por		mm0, mm1		//%%mm1,%%mm0			// mm0 = vol|vol|vol|vol
    68 
    69 		#ifndef __WATCOMC__
    70 		align	16
    71 		#endif
    72 mixloopS16:
    73 		movq	mm1, [esi]		//(%%esi),%%mm1\n" // mm1 = a|b|c|d
    74 		movq	mm2, mm1		//%%mm1,%%mm2\n" // mm2 = a|b|c|d
    75 		movq	mm4, [esi + 8]	//8(%%esi),%%mm4\n" // mm4 = e|f|g|h
    76 		// pre charger le buffer dst dans mm7
    77 		movq	mm7, [edi]		//(%%edi),%%mm7\n" // mm7 = dst[0]"
    78 		// multiplier par le volume
    79 		pmullw	mm1, mm0		//%%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
    80 		pmulhw	mm2, mm0		//%%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v)
    81 		movq	mm5, mm4		//%%mm4,%%mm5\n" // mm5 = e|f|g|h
    82 		pmullw	mm4, mm0		//%%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
    83 		pmulhw	mm5, mm0		//%%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v)
    84 		movq	mm3, mm1		//%%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
    85 		punpckhwd	mm1, mm2	//%%mm2,%%mm1\n" // mm1 = a*v|b*v
    86 		movq		mm6, mm4	//%%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
    87 		punpcklwd	mm3, mm2	//%%mm2,%%mm3\n" // mm3 = c*v|d*v
    88 		punpckhwd	mm4, mm5	//%%mm5,%%mm4\n" // mm4 = e*f|f*v
    89 		punpcklwd	mm6, mm5	//%%mm5,%%mm6\n" // mm6 = g*v|h*v
    90 		// pre charger le buffer dst dans mm5
    91 		movq	mm5, [edi + 8]	//8(%%edi),%%mm5\n" // mm5 = dst[1]
    92 		// diviser par 128
    93 		psrad	mm1, 7			//$7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME
    94 		add		esi, 16			//$16,%%esi\n"
    95 		psrad	mm3, 7			//$7,%%mm3\n" // mm3 = c*v/128|d*v/128
    96 		psrad	mm4, 7			//$7,%%mm4\n" // mm4 = e*v/128|f*v/128
    97 		// mm1 = le sample avec le volume modifie
    98 		packssdw	mm3, mm1	//%%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v)
    99 		psrad	mm6, 7			//$7,%%mm6\n" // mm6= g*v/128|h*v/128
   100 		paddsw	mm3, mm7		//%%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst
   101 		// mm4 = le sample avec le volume modifie
   102 		packssdw	mm6, mm4	//%%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v)
   103 		movq	[edi], mm3		//%%mm3,(%%edi)\n"
   104 		paddsw	mm6, mm5		//%%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst
   105 		movq	[edi + 8], mm6	//%%mm6,8(%%edi)\n"
   106 		add		edi, 16			//$16,%%edi\n"
   107 		dec		ebx				//%%ebx\n"
   108 		jnz mixloopS16
   109 
   110 endS16:
   111 		emms
   112 		
   113 		pop		ebx
   114 		pop		esi
   115 		pop		edi
   116 	}
   117     /* *INDENT-ON* */
   118 }
   119 
   120 ////////////////////////////////////////////////
   121 // Mixing for 8 bit signed buffers
   122 ////////////////////////////////////////////////
   123 
   124 void
   125 SDL_MixAudio_MMX_S8_VC(char *dst, char *src, unsigned int nSize, int volume)
   126 {
   127     /* *INDENT-OFF* */
   128 	_asm
   129 	{
   130 
   131 		push	edi
   132 		push	esi
   133 		push	ebx
   134 		
   135 		mov		edi, dst	//movl	%0,%%edi	// edi = dst
   136 		mov		esi, src	//%1,%%esi	// esi = src
   137 		mov		eax, volume	//%3,%%eax	// eax = volume
   138 
   139 		movd	mm0, eax	//%%eax,%%mm0
   140 		movq	mm1, mm0	//%%mm0,%%mm1
   141 		psllq	mm0, 16		//$16,%%mm0
   142 		por		mm0, mm1	//%%mm1,%%mm0
   143 		psllq	mm0, 16		//$16,%%mm0
   144 		por		mm0, mm1	//%%mm1,%%mm0
   145 		psllq	mm0, 16		//$16,%%mm0
   146 		por		mm0, mm1	//%%mm1,%%mm0
   147 		
   148 		mov		ebx, nSize	//%2,%%ebx	// ebx = size
   149 		shr		ebx, 3		//$3,%%ebx	// process 8 bytes per iteration = 8 samples
   150 		cmp		ebx, 0		//$0,%%ebx
   151 		je		endS8
   152 
   153 		#ifndef __WATCOMC__
   154 		align 16
   155 		#endif
   156 mixloopS8:
   157 		pxor	mm2, mm2	//%%mm2,%%mm2		// mm2 = 0
   158 		movq	mm1, [esi]	//(%%esi),%%mm1	// mm1 = a|b|c|d|e|f|g|h
   159 		movq	mm3, mm1	//%%mm1,%%mm3 	// mm3 = a|b|c|d|e|f|g|h
   160 		// on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0
   161 		pcmpgtb		mm2, mm1	//%%mm1,%%mm2	// mm2 = 11111111|00000000|00000000....
   162 		punpckhbw	mm1, mm2	//%%mm2,%%mm1	// mm1 = 0|a|0|b|0|c|0|d
   163 		punpcklbw	mm3, mm2	//%%mm2,%%mm3	// mm3 = 0|e|0|f|0|g|0|h
   164 		movq	mm2, [edi]	//(%%edi),%%mm2	// mm2 = destination
   165 		pmullw	mm1, mm0	//%%mm0,%%mm1	// mm1 = v*a|v*b|v*c|v*d
   166 		add		esi, 8		//$8,%%esi
   167 		pmullw	mm3, mm0	//%%mm0,%%mm3	// mm3 = v*e|v*f|v*g|v*h
   168 		psraw	mm1, 7		//$7,%%mm1		// mm1 = v*a/128|v*b/128|v*c/128|v*d/128 
   169 		psraw	mm3, 7		//$7,%%mm3		// mm3 = v*e/128|v*f/128|v*g/128|v*h/128
   170 		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
   171 		paddsb	mm3, mm2	//%%mm2,%%mm3	// add to destination buffer
   172 		movq	[edi], mm3	//%%mm3,(%%edi)	// store back to ram
   173 		add		edi, 8		//$8,%%edi
   174 		dec		ebx			//%%ebx
   175 		jnz		mixloopS8
   176 		
   177 endS8:
   178 		emms
   179 		
   180 		pop		ebx
   181 		pop		esi
   182 		pop		edi
   183 	}
   184     /* *INDENT-ON* */
   185 }
   186 
   187 #endif /* SDL_ASSEMBLY_ROUTINES */
   188 #endif /* SDL_BUGGY_MMX_MIXERS */
   189 
   190 /* vi: set ts=4 sw=4 expandtab: */