-CodeChange: add PowerPC G4/G5 altivec code for Video_DrawScreen_Near…

…est_Neighbor()

config.lib

@@ -895,6 +895,11 @@ make_cflags_and_ldflags() {
 					# Intel is only available starting from 10.4
 					CFLAGS="$CFLAGS -mmacosx-version-min=10.4"
 				fi
+				machine=$(machine)
+				case $machine in
+					ppc7400 | ppc7450 | ppc970)
+					CFLAGS="$CFLAGS -maltivec" ;;
+				esac
 			fi
 		fi
 	fi

include/types.h

@@ -100,6 +100,11 @@ typedef struct tile32 {
 	uint16 y;
 } tile32;
 
+#ifdef __ALTIVEC__
+#undef bool
+#undef pixel
+#endif
+
 #ifndef bool
 typedef unsigned char bool;
 #define false 0

src/video/video_sdl.c

@@ -1,12 +1,15 @@
 /** @file src/video/video_sdl.c SDL video driver. */
 
 #include <SDL.h>
+#if defined(__ALTIVEC__)
+#include <altivec.h>
+#endif /* __ALTIVEC__ */
 #include "types.h"
 #include "../os/error.h"
 
 #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
 #include <mmintrin.h>
-#endif
+#endif /* i386 / x86_64 */
 
 #include "video.h"
 
@@ -267,6 +270,23 @@ static void Video_DrawScreen_Nearest_Neighbor(void)
 				*((__m64 *)gfx2) = m;
 				gfx2 += 8;
 			}
+#elif defined(__ALTIVEC__)
+			/* G4/G5 altivec code */
+			for (x = SCREEN_WIDTH / 16; x > 0; x--) {
+				vector unsigned char m0;
+				vector unsigned char m1;
+				m0 = *((vector unsigned char *)data);
+				m1 = m0;
+				data += 16;
+				m0 = vec_mergeh(m0, m0);
+				m1 = vec_mergel(m1, m1);
+				((vector unsigned char *)gfx1)[0] = m0;
+				((vector unsigned char *)gfx1)[1] = m1;
+				gfx1 += 32;
+				((vector unsigned char *)gfx2)[0] = m0;
+				((vector unsigned char *)gfx2)[1] = m1;
+				gfx2 += 32;
+			}
 #else
 			for (x = 0; x < SCREEN_WIDTH; x++) {
 				uint8 value = *data++;