Adds support for building on Intel Macs, using a modified

version of patch 1448395 by Aubin and some of my 
own changes.

Notably:
* Two elements of a struct in backends/midi/quicktime.cpp
needed to be forced to BE.
* NASM set to build Mach-O binaries
* configure now checks for Altivec support on Darwin hosts,
instead of assuming it. Altivec support can also be disabled (not 100% sure if t
his is actually needed, but might be handy for crosscompiling).
* The aliasing of the symbols contained in the .asm files
done on Windows were also needed on MacOS.

Note that while the asm code is properly compiled and linked
in, HQ2/3x support will still not work properly on Intel macs
if NASM is enabled.

svn-id: r21280

backends/midi/quicktime.cpp

@@ -84,8 +84,8 @@ int MidiDriver_QT::open() {
 		goto bail;
 
 	simpleNoteRequest.info.flags = 0;
-	simpleNoteRequest.info.polyphony = 11;	// simultaneous tones
-	simpleNoteRequest.info.typicalPolyphony = 0x00010000;
+	WRITE_BE_UINT16(& simpleNoteRequest.info.polyphony, 11);        // simultaneous tones
+	WRITE_BE_UINT16(& simpleNoteRequest.info.typicalPolyphony, 0x00010000);
 
 	qtErr = NAStuffToneDescription(qtNoteAllocator, 1, &simpleNoteRequest.tone);
 	if (qtErr != noErr)

configure

@@ -62,6 +62,7 @@ _build_cine=no
 _need_memalign=no
 _build_plugins=no
 _nasm=auto
+_altivec=auto
 _build_hq_scalers=yes
 _build_scalers=yes
 # more defaults
@@ -248,6 +249,9 @@ CheckNASM()
 			mingw* | cygwin*)
 				NASMFLAGS="-f win32"
 			;;
+			darwin*)
+				NASMFLAGS="-f macho"
+			;;
 			*)
 				NASMFLAGS="-f elf"
 			;;
@@ -343,6 +347,7 @@ Optional Libraries:
 
   --with-nasm-prefix=DIR   Prefix where nasm executable is installed (optional)
   --disable-nasm           disable assembly language optimizations [autodetect]
+  --disable-altivec        disable altivec optimizations [autodetect]
 
 Some influential environment variables:
   LDFLAGS   linker flags, e.g. -L<lib dir> if you have libraries in a
@@ -395,6 +400,7 @@ for ac_option in $@; do
       --enable-plugins)         _build_plugins=yes ;;
       --enable-mt32emu)         _mt32emu=yes    ;;
       --disable-mt32emu)        _mt32emu=no     ;;
+      --disable-altivec)        _altivec=no     ;;
       --with-fluidsynth-prefix=*)
         arg=`echo $ac_option | cut -d '=' -f 2`
         FLUIDSYNTH_CFLAGS="-I$arg/include"
@@ -782,9 +788,6 @@ else
 		darwin*)
 			DEFINES="$DEFINES -DUNIX -DMACOSX"
 			LIBS="$LIBS -framework QuickTime -framework AudioUnit -framework AudioToolbox -framework Carbon -framework CoreMIDI"
-			# TODO: Add proper check for Altivec support in the compiler...
-			DEFINES="$DEFINES -DHAS_ALTIVEC"
-			CXXFLAGS="$CXXFLAGS -faltivec"
 			;;
 		mingw*)
 			DEFINES="$DEFINES -DWIN32"
@@ -1229,6 +1232,30 @@ fi
 test -z "$_bindir" && _bindir="$_prefix/bin"
 test -z "$_mandir" && _mandir="$_prefix/man"
 
+#
+# Check for Altivec, if on MacOS X
+#
+case $_host_os in
+	darwin*)
+		echocheck "Altivec"
+		if test "$_altivec" = auto ; then
+			_altivec=no
+			cat > $TMPC << EOF
+int main(void) { return 0; }
+EOF
+			cc_check $LDFLAGS $CXXFLAGS -maltivec && _altivec=yes
+		fi
+		if test "$_altivec" = yes ; then
+				DEFINES="$DEFINES -DHAS_ALTIVEC"
+				CXXFLAGS="$CXXFLAGS -faltivec"
+				CFLAGS="$CFLAGS -faltivec"
+		fi  
+		echo "$_altivec"
+		rm -f $TMPC $TMPO$EXEEXT
+	;;
+esac
+
+
 #
 # Check which engines ("frontends") are to be built
 #

graphics/scaler.cpp

@@ -37,9 +37,11 @@ extern "C" {
 //       condition here
 
 #ifndef _WIN32
+#ifndef MACOSX
 #define RGBtoYUV _RGBtoYUV
 #define LUT16to32 _LUT16to32
 #endif
+#endif
 
 #endif
 

graphics/scaler/hq2x.cpp

@@ -29,8 +29,10 @@
 extern "C" {
 
 #ifndef _WIN32
+#ifndef MACOSX
 #define hq2x_16 _hq2x_16
 #endif
+#endif
 
 void hq2x_16(const byte *, byte *, uint32, uint32, uint32, uint32);
 

graphics/scaler/hq3x.cpp

@@ -29,8 +29,10 @@
 extern "C" {
 
 #ifndef _WIN32
+#ifndef MACOSX
 #define hq3x_16 _hq3x_16
 #endif
+#endif
 
 void hq3x_16(const byte *, byte *, uint32, uint32, uint32, uint32);