SDL Windows updates:

- Fixed build on windows
- Clear the screen before each frame when in opengl mode to remove artifacts on Windows
- Don't use the asm version of the Sai2x filters anymore, since it somehow doesn't link on Windows

Makefile

@@ -40,7 +40,7 @@ ifndef $(PREFIX)
 endif
 
 ifndef VERSION
-  SVNVERSION=$(shell test -d .svn && svnversion -n .)
+  -SVNVERSION=$(shell test -d .svn && svnversion -n .)
   BADCHARS=$(findstring :,$(SVNVERSION))$(findstring S,$(SVNVERSION))
   ifeq ($(BADCHARS),)
     ifneq ($(SVNVERSION),)
@@ -66,7 +66,7 @@ HQASMDIR=src/hq/asm
 
 
 ASMOBJ=${HQASMDIR}/hq3x_16${OE} ${HQASMDIR}/hq3x_32${OE} ${HQASMDIR}/hq4x_16${OE} \
-${HQASMDIR}/hq4x_32${OE} ${HQASMDIR}/hq3x32${OE} ${MAINDIR}/2xSaImmx${OE}
+${HQASMDIR}/hq4x_32${OE} ${HQASMDIR}/hq3x32${OE}
 
 GBAPUOBJ=${GBAPUDIR}/Blip_Buffer${OE} ${GBAPUDIR}/Effects_Buffer${OE} ${GBAPUDIR}/Gb_Apu${OE} \
 ${GBAPUDIR}/Gb_Apu_State${OE} ${GBAPUDIR}/Gb_Oscs${OE} ${GBAPUDIR}/Multi_Buffer${OE}
@@ -96,7 +96,6 @@ OBJECTS=${MAINOBJ} ${DMGOBJ} ${SDLOBJ} ${GBAPUOBJ}
 
 ifeq ($(USEASM),yes)
 OBJECTS+=${ASMOBJ}
-CXXFLAGS+=-DMMX
 else
 OBJECTS+=${CALTERNOBJ}
 endif

src/sdl/SDL.cpp

@@ -435,7 +435,7 @@ FILE *sdlFindFile(const char *name)
   }
 
 #ifdef _WIN32
-  home = getenv("USERPROFILE");
+  char *home = getenv("USERPROFILE");
   if(home != NULL) {
     fprintf(stderr, "Searching user profile directory: %s\n", home);
     sprintf(path, "%s%c%s", home, FILE_SEP, name);
@@ -1602,12 +1602,16 @@ int main(int argc, char **argv)
   char buf[1024];
   struct stat s;
   
+#ifndef _WIN32
   // Get home dir
   homeDir = getenv("HOME");
   snprintf(buf, 1024, "%s/%s", homeDir, DOT_DIR);
   // Make dot dir if not existent
   if (stat(buf, &s) == -1 || !S_ISDIR(s.st_mode))
     mkdir(buf, 0755);
+#else
+  homeDir = 0;
+#endif
 
   sdlReadPreferences();
 
@@ -2123,6 +2127,7 @@ void systemDrawScreen()
     drawSpeed(screen, destPitch, 10, 20);
 
   if (openGL) {
+    glClear( GL_COLOR_BUFFER_BIT );
     glPixelStorei(GL_UNPACK_ROW_LENGTH, destWidth);
     if (systemColorDepth == 16)
       glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, destWidth, destHeight,