Cth converted the MMX audio mixing routines to VC++ syntax

src/audio/Makefile.am

@@ -24,7 +24,9 @@ COMMON_SRCS =			\
 	SDL_wave.c		\
 	SDL_wave.h              \
 	SDL_mixer_MMX.c         \
-	SDL_mixer_MMX.h
+	SDL_mixer_MMX.h		\
+	SDL_mixer_MMX_VC.c	\
+	SDL_mixer_MMX_VC.h
 
 libaudio_la_SOURCES = $(COMMON_SRCS)
 libaudio_la_LIBADD = $(DRIVERS)

src/audio/SDL_mixer.c

@@ -36,6 +36,7 @@ static char rcsid =
 #include "SDL_timer.h"
 #include "SDL_sysaudio.h"
 #include "SDL_mixer_MMX.h"
+#include "SDL_mixer_MMX_VC.h"
 
 /* Function to check the CPU flags */
 #define MMX_CPU		0x800000
@@ -147,13 +148,19 @@ void SDL_MixAudio (Uint8 *dst, const Uint8 *src, Uint32 len, int volume)
 		break;
 
 		case AUDIO_S8: {
-
 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
 			if (CPU_Flags() & MMX_CPU)
 			{
 				SDL_MixAudio_MMX_S8((char*)dst,(char*)src,(unsigned int)len,(int)volume);
 			}
 			else
+#endif
+#if defined(USE_ASM_MIXER_VC)
+			if (SDL_IsMMX_VC())
+			{
+				SDL_MixAudio_MMX_S8_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume);
+			}
+			else
 #endif
 			{
 			Sint8 *dst8, *src8;
@@ -190,6 +197,12 @@ void SDL_MixAudio (Uint8 *dst, const Uint8 *src, Uint32 len, int volume)
 				SDL_MixAudio_MMX_S16((char*)dst,(char*)src,(unsigned int)len,(int)volume);
 			}
 			else
+#elif defined(USE_ASM_MIXER_VC)
+			if (SDL_IsMMX_VC())
+			{
+				SDL_MixAudio_MMX_S16_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume);
+			}
+			else
 #endif
 			{
 			Sint16 src1, src2;
@@ -251,3 +264,4 @@ void SDL_MixAudio (Uint8 *dst, const Uint8 *src, Uint32 len, int volume)
 			return;
 	}
 }
+

src/audio/SDL_mixer_MMX_VC.c

@@ -0,0 +1,205 @@
+// 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)
+// Converted to Intel ASM notation by Cth
+// 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(USE_ASM_MIXER_VC)
+#include <windows.h>
+#include <stdio.h>
+
+void SDL_MixAudio_MMX_S16_VC(char* dst,char* src,unsigned int nSize,int volume)
+{
+	__asm
+	{
+		align	16
+
+		push	edi
+		push	esi
+		push	ebx
+
+		mov		edi, dst		// edi = dst
+		mov		esi, src		// esi = src
+		mov		eax, volume		// eax = volume
+		mov		ebx, nSize		// ebx = size
+		shr		ebx, 4			// process 16 bytes per iteration = 8 samples
+		jz		endS16
+
+		pxor	mm0, mm0
+		movd	mm0, eax		//%%eax,%%mm0
+		movq	mm1, mm0		//%%mm0,%%mm1
+		psllq	mm0, 16			//$16,%%mm0
+		por		mm0, mm1		//%%mm1,%%mm0
+		psllq	mm0, 16			//$16,%%mm0
+		por		mm0, mm1		//%%mm1,%%mm0
+		psllq	mm0, 16			//$16,%%mm0
+		por		mm0, mm1		//%%mm1,%%mm0			// mm0 = vol|vol|vol|vol
+
+mixloopS16:
+		movq	mm1, [esi]		//(%%esi),%%mm1\n" // mm1 = a|b|c|d
+		movq	mm2, mm1		//%%mm1,%%mm2\n" // mm2 = a|b|c|d
+		movq	mm4, [esi + 8]	//8(%%esi),%%mm4\n" // mm4 = e|f|g|h
+		// pre charger le buffer dst dans mm7
+		movq	mm7, [edi]		//(%%edi),%%mm7\n" // mm7 = dst[0]"
+		// multiplier par le volume
+		pmullw	mm1, mm0		//%%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
+		pmulhw	mm2, mm0		//%%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v)
+		movq	mm5, mm4		//%%mm4,%%mm5\n" // mm5 = e|f|g|h
+		pmullw	mm4, mm0		//%%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
+		pmulhw	mm5, mm0		//%%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v)
+		movq	mm3, mm1		//%%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
+		punpckhwd	mm1, mm2	//%%mm2,%%mm1\n" // mm1 = a*v|b*v
+		movq		mm6, mm4	//%%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
+		punpcklwd	mm3, mm2	//%%mm2,%%mm3\n" // mm3 = c*v|d*v
+		punpckhwd	mm4, mm5	//%%mm5,%%mm4\n" // mm4 = e*f|f*v
+		punpcklwd	mm6, mm5	//%%mm5,%%mm6\n" // mm6 = g*v|h*v
+		// pre charger le buffer dst dans mm5
+		movq	mm5, [edi + 8]	//8(%%edi),%%mm5\n" // mm5 = dst[1]
+		// diviser par 128
+		psrad	mm1, 7			//$7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME
+		add		esi, 16			//$16,%%esi\n"
+		psrad	mm3, 7			//$7,%%mm3\n" // mm3 = c*v/128|d*v/128
+		psrad	mm4, 7			//$7,%%mm4\n" // mm4 = e*v/128|f*v/128
+		// mm1 = le sample avec le volume modifie
+		packssdw	mm3, mm1	//%%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v)
+		psrad	mm6, 7			//$7,%%mm6\n" // mm6= g*v/128|h*v/128
+		paddsw	mm3, mm7		//%%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst
+		// mm4 = le sample avec le volume modifie
+		packssdw	mm6, mm4	//%%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v)
+		movq	[edi], mm3		//%%mm3,(%%edi)\n"
+		paddsw	mm6, mm5		//%%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst
+		movq	[edi + 8], mm6	//%%mm6,8(%%edi)\n"
+		add		edi, 16			//$16,%%edi\n"
+		dec		ebx				//%%ebx\n"
+		jnz mixloopS16
+
+ends16:
+		emms
+
+		pop		ebx
+		pop		esi
+		pop		edi
+	}
+
+}
+
+////////////////////////////////////////////////
+// Mixing for 8 bit signed buffers
+////////////////////////////////////////////////
+
+void SDL_MixAudio_MMX_S8_VC(char* dst,char* src,unsigned int nSize,int volume)
+{
+	_asm
+	{
+		align 16
+
+		push	edi
+		push	esi
+		push	ebx
+
+		mov		edi, dst	//movl	%0,%%edi	// edi = dst
+		mov		esi, src	//%1,%%esi	// esi = src
+		mov		eax, volume	//%3,%%eax	// eax = volume
+
+		movd	mm0, ebx	//%%ebx,%%mm0
+		movq	mm1, mm0	//%%mm0,%%mm1
+		psllq	mm0, 16		//$16,%%mm0
+		por		mm0, mm1	//%%mm1,%%mm0
+		psllq	mm0, 16		//$16,%%mm0
+		por		mm0, mm1	//%%mm1,%%mm0
+		psllq	mm0, 16		//$16,%%mm0
+		por		mm0, mm1	//%%mm1,%%mm0
+
+		mov		ebx, nSize	//%2,%%ebx	// ebx = size
+		shr		ebx, 3		//$3,%%ebx	// process 8 bytes per iteration = 8 samples
+		cmp		ebx, 0		//$0,%%ebx
+		je		endS8
+
+mixloopS8:
+		pxor	mm2, mm2	//%%mm2,%%mm2		// mm2 = 0
+		movq	mm1, [esi]	//(%%esi),%%mm1	// mm1 = a|b|c|d|e|f|g|h
+		movq	mm3, mm1	//%%mm1,%%mm3 	// 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		mm2, mm1	//%%mm1,%%mm2	// mm2 = 11111111|00000000|00000000....
+		punpckhbw	mm1, mm2	//%%mm2,%%mm1	// mm1 = 0|a|0|b|0|c|0|d
+		punpcklbw	mm3, mm2	//%%mm2,%%mm3	// mm3 = 0|e|0|f|0|g|0|h
+		movq	mm2, [edi]	//(%%edi),%%mm2	// mm2 = destination
+		pmullw	mm1, mm0	//%%mm0,%%mm1	// mm1 = v*a|v*b|v*c|v*d
+		add		esi, 8		//$8,%%esi
+		pmullw	mm3, mm0	//%%mm0,%%mm3	// mm3 = v*e|v*f|v*g|v*h
+		psraw	mm1, 7		//$7,%%mm1		// mm1 = v*a/128|v*b/128|v*c/128|v*d/128 
+		psraw	mm3, 7		//$7,%%mm3		// mm3 = v*e/128|v*f/128|v*g/128|v*h/128
+		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
+		paddsb	mm3, mm2	//%%mm2,%%mm3	// add to destination buffer
+		movq	[edi], mm3	//%%mm3,(%%edi)	// store back to ram
+		add		edi, 8		//$8,%%edi
+		dec		ebx			//%%ebx
+		jnz		mixloopS8
+
+endS8:
+		emms
+
+		pop		ebx
+		pop		esi
+		pop		edi
+	}
+}
+
+int _SDL_IsMMX_VC()
+{
+	// This	bit	flag can get set on	calling	cpuid
+	// with	register eax set to	1
+	const int _MMX_FEATURE_BIT = 0x00800000;
+	DWORD dwFeature	= 0;
+	__try {
+			_asm {
+				mov	eax,1
+				cpuid
+				mov	dwFeature,edx
+			}
+	} __except ( EXCEPTION_EXECUTE_HANDLER)	{
+			return 0;
+	}
+	if (dwFeature &	_MMX_FEATURE_BIT) {
+		__try {
+			__asm {
+				pxor mm0, mm0
+				emms
+			}
+		} __except (EXCEPTION_EXECUTE_HANDLER) {
+			return(0);
+		}
+		return 1;
+	}
+
+	return 0;
+}
+
+static int _notTwice = 2;
+
+int SDL_IsMMX_VC()
+{
+	if (_notTwice > 1)
+	{
+		_notTwice = _SDL_IsMMX_VC();
+/*
+#ifdef _DEBUG
+		if (_notTwice)
+			MessageBox( NULL, "Using MMX!!!", "Error", MB_OK | MB_ICONINFORMATION );
+		else
+			MessageBox( NULL, "Not sing MMX!!!", "Error", MB_OK | MB_ICONINFORMATION );
+#endif
+*/
+	}
+	return _notTwice;
+}
+
+#endif
+

src/audio/SDL_mixer_MMX_VC.h

@@ -0,0 +1,15 @@
+// headers for MMX assembler version of SDL_MixAudio
+// Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr)
+// Converted to Intel ASM notation by Cth
+// 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
+
+#if defined(USE_ASM_MIXER_VC)
+void SDL_MixAudio_MMX_S16_VC(char* ,char* ,unsigned int ,int );
+void SDL_MixAudio_MMX_S8_VC(char* ,char* ,unsigned int ,int );
+int SDL_IsMMX_VC();
+#endif
+
+