src/video/SDL_blit_N.c
changeset 1047 ffaaf7ecf685
parent 769 b8d311d90021
child 1053 f596fa4f17a6
--- a/src/video/SDL_blit_N.c	Sun Apr 17 10:16:30 2005 +0000
+++ b/src/video/SDL_blit_N.c	Sun Apr 17 10:19:22 2005 +0000
@@ -35,6 +35,656 @@
 
 /* Functions to blit from N-bit surfaces to other surfaces */
 
+#ifdef USE_ALTIVEC_BLITTERS
+#include <assert.h>
+#ifdef MACOSX
+#include <sys/sysctl.h>
+#include <stdlib.h>
+static size_t GetL3CacheSize( void )
+{
+    const char key[] = "hw.l3cachesize";
+    u_int64_t result = 0;
+    size_t typeSize = sizeof( result );
+
+
+    int err = sysctlbyname( key, &result, &typeSize, NULL, 0 );
+    if( 0 != err ) return 0;
+
+    return result;
+}
+#else
+static size_t GetL3CacheSize( void )
+{
+    /* XXX: Just guess G4 */
+    return 2097152;
+}
+#endif /* MACOSX */
+
+#define UNALIGNED_PTR(x) (((size_t) x) & 0x0000000F)
+#define VSWIZZLE32(a,b,c,d) (vector unsigned char) \
+                               ( 0x00+a, 0x00+b, 0x00+c, 0x00+d, \
+                                 0x04+a, 0x04+b, 0x04+c, 0x04+d, \
+                                 0x08+a, 0x08+b, 0x08+c, 0x08+d, \
+                                 0x0C+a, 0x0C+b, 0x0C+c, 0x0C+d )
+
+#define MAKE8888(dstfmt, r, g, b, a)  \
+    ( ((r<<dstfmt->Rshift)&dstfmt->Rmask) | \
+      ((g<<dstfmt->Gshift)&dstfmt->Gmask) | \
+      ((b<<dstfmt->Bshift)&dstfmt->Bmask) | \
+      ((a<<dstfmt->Ashift)&dstfmt->Amask) )
+
+/*
+ * Data Stream Touch...Altivec cache prefetching.
+ *
+ *  Don't use this on a G5...however, the speed boost is very significant
+ *   on a G4.
+ */
+#define DST_CHAN_SRC 1
+#define DST_CHAN_DEST 2
+
+/* macro to set DST control word value... */
+#define DST_CTRL(size, count, stride) \
+    (((size) << 24) | ((count) << 16) | (stride))
+
+#define VEC_ALIGNER(src) ((UNALIGNED_PTR(src)) \
+    ? vec_lvsl(0, src) \
+    : vec_add(vec_lvsl(8, src), vec_splat_u8(8)))
+
+/* Calculate the permute vector used for 32->32 swizzling */
+static vector unsigned char calc_swizzle32(const SDL_PixelFormat *srcfmt,
+                                  const SDL_PixelFormat *dstfmt)
+{
+    /*
+    * We have to assume that the bits that aren't used by other
+     *  colors is alpha, and it's one complete byte, since some formats
+     *  leave alpha with a zero mask, but we should still swizzle the bits.
+     */
+    /* ARGB */
+    const static struct SDL_PixelFormat default_pixel_format = {
+        NULL, 0, 0,
+        0, 0, 0, 0,
+        16, 8, 0, 24,
+        0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000,
+        0, 0};
+    if (!srcfmt) {
+        srcfmt = &default_pixel_format;
+    }
+    if (!dstfmt) {
+        dstfmt = &default_pixel_format;
+    }
+    vector unsigned char plus = (vector unsigned char)( 0x00, 0x00, 0x00, 0x00,
+                                      0x04, 0x04, 0x04, 0x04,
+                                      0x08, 0x08, 0x08, 0x08,
+                                      0x0C, 0x0C, 0x0C, 0x0C );
+    vector unsigned char vswiz;
+    vector unsigned int srcvec;
+#define RESHIFT(X) (3 - ((X) >> 3))
+    Uint32 rmask = RESHIFT(srcfmt->Rshift) << (dstfmt->Rshift);
+    Uint32 gmask = RESHIFT(srcfmt->Gshift) << (dstfmt->Gshift);
+    Uint32 bmask = RESHIFT(srcfmt->Bshift) << (dstfmt->Bshift);
+    Uint32 amask;
+    /* Use zero for alpha if either surface doesn't have alpha */
+    if (dstfmt->Amask) {
+        amask = ((srcfmt->Amask) ? RESHIFT(srcfmt->Ashift) : 0x10) << (dstfmt->Ashift);
+    } else {    
+        amask = 0x10101010 & ((dstfmt->Rmask | dstfmt->Gmask | dstfmt->Bmask) ^ 0xFFFFFFFF);
+    }           
+#undef RESHIFT  
+    ((unsigned int *)&srcvec)[0] = (rmask | gmask | bmask | amask);
+    vswiz = vec_add(plus, (vector unsigned char)vec_splat(srcvec, 0));
+    return(vswiz);
+}
+
+static void Blit_RGB888_RGB565(SDL_BlitInfo *info);
+static void Blit_RGB888_RGB565Altivec(SDL_BlitInfo *info) {
+    int height = info->d_height;
+    Uint8 *src = (Uint8 *) info->s_pixels;
+    int srcskip = info->s_skip;
+    Uint8 *dst = (Uint8 *) info->d_pixels;
+    int dstskip = info->d_skip;
+    SDL_PixelFormat *srcfmt = info->src;
+    vector unsigned char valpha = vec_splat_u8(0);
+    vector unsigned char vpermute = calc_swizzle32(srcfmt, NULL);
+    vector unsigned char vgmerge = (vector unsigned char)(
+        0x00, 0x02, 0x00, 0x06,
+        0x00, 0x0a, 0x00, 0x0e,
+        0x00, 0x12, 0x00, 0x16,
+        0x00, 0x1a, 0x00, 0x1e);
+    vector unsigned short v1 = vec_splat_u16(1);
+    vector unsigned short v3 = vec_splat_u16(3);
+    vector unsigned short v3f = (vector unsigned short)(
+        0x003f, 0x003f, 0x003f, 0x003f,
+        0x003f, 0x003f, 0x003f, 0x003f);
+    vector unsigned short vfc = (vector unsigned short)(
+        0x00fc, 0x00fc, 0x00fc, 0x00fc,
+        0x00fc, 0x00fc, 0x00fc, 0x00fc);
+    vector unsigned short vf800 = (vector unsigned short)vec_splat_u8(-7);
+    vf800 = vec_sl(vf800, vec_splat_u16(8));
+
+    while (height--) {
+        vector unsigned char valigner;
+        vector unsigned char voverflow;
+        vector unsigned char vsrc;
+
+        int width = info->d_width;
+        int extrawidth;
+
+        /* do scalar until we can align... */
+#define ONE_PIXEL_BLEND(condition, widthvar) \
+        while (condition) { \
+            Uint32 pixel; \
+            unsigned sR, sG, sB, sA; \
+            DISEMBLE_RGBA((Uint8 *)src, 4, srcfmt, pixel, \
+                          sR, sG, sB, sA); \
+            *(Uint16 *)(dst) = (((sR << 8) & 0x0000F800) | \
+                                ((sG << 3) & 0x000007E0) | \
+                                ((sB >> 3) & 0x0000001F)); \
+            dst += 2; \
+            src += 4; \
+            widthvar--; \
+        }
+
+        ONE_PIXEL_BLEND(((UNALIGNED_PTR(dst)) && (width)), width);
+
+        /* After all that work, here's the vector part! */
+        extrawidth = (width % 8);  /* trailing unaligned stores */
+        width -= extrawidth;
+        vsrc = vec_ld(0, src);
+        valigner = VEC_ALIGNER(src);
+
+        while (width) {
+            vector unsigned short vpixel, vrpixel, vgpixel, vbpixel;
+            vector unsigned int vsrc1, vsrc2;
+            vector unsigned char vdst;
+
+            voverflow = vec_ld(15, src);
+            vsrc = vec_perm(vsrc, voverflow, valigner);
+            vsrc1 = (vector unsigned int)vec_perm(vsrc, valpha, vpermute);
+            src += 16;
+            vsrc = voverflow;
+            voverflow = vec_ld(15, src);
+            vsrc = vec_perm(vsrc, voverflow, valigner);
+            vsrc2 = (vector unsigned int)vec_perm(vsrc, valpha, vpermute);
+            /* 1555 */
+            vpixel = (vector unsigned short)vec_packpx(vsrc1, vsrc2);
+            vgpixel = (vector unsigned short)vec_perm(vsrc1, vsrc2, vgmerge);
+            vgpixel = vec_and(vgpixel, vfc);
+            vgpixel = vec_sl(vgpixel, v3);
+            vrpixel = vec_sl(vpixel, v1);
+            vrpixel = vec_and(vrpixel, vf800);
+            vbpixel = vec_and(vpixel, v3f);
+            vdst = vec_or((vector unsigned char)vrpixel, (vector unsigned char)vgpixel);
+            /* 565 */
+            vdst = vec_or(vdst, (vector unsigned char)vbpixel);
+            vec_st(vdst, 0, dst);
+
+            width -= 8;
+            src += 16;
+            dst += 16;
+            vsrc = voverflow;
+        }
+
+        assert(width == 0);
+
+
+        /* do scalar until we can align... */
+        ONE_PIXEL_BLEND((extrawidth), extrawidth);
+#undef ONE_PIXEL_BLEND
+
+        src += srcskip;  /* move to next row, accounting for pitch. */
+        dst += dstskip;
+    }
+
+
+}
+
+static void Blit_RGB565_32Altivec(SDL_BlitInfo *info) {
+    int height = info->d_height;
+    Uint8 *src = (Uint8 *) info->s_pixels;
+    int srcskip = info->s_skip;
+    Uint8 *dst = (Uint8 *) info->d_pixels;
+    int dstskip = info->d_skip;
+    SDL_PixelFormat *srcfmt = info->src;
+    SDL_PixelFormat *dstfmt = info->dst;
+    unsigned alpha;
+    vector unsigned char valpha;
+    vector unsigned char vpermute;
+    vector unsigned short vf800;
+    vector unsigned int v8 = vec_splat_u32(8);
+    vector unsigned int v16 = vec_add(v8, v8);
+    vector unsigned short v2 = vec_splat_u16(2);
+    vector unsigned short v3 = vec_splat_u16(3);
+    /* 
+        0x10 - 0x1f is the alpha
+        0x00 - 0x0e evens are the red
+        0x01 - 0x0f odds are zero
+    */
+    vector unsigned char vredalpha1 = (vector unsigned char)(
+        0x10, 0x00, 0x01, 0x01,
+        0x10, 0x02, 0x01, 0x01,
+        0x10, 0x04, 0x01, 0x01,
+        0x10, 0x06, 0x01, 0x01
+    );
+    vector unsigned char vredalpha2 = (vector unsigned char)(
+        vec_add((vector unsigned int)vredalpha1, vec_sl(v8, v16))
+    );
+    /*
+        0x00 - 0x0f is ARxx ARxx ARxx ARxx
+        0x11 - 0x0f odds are blue
+    */
+    vector unsigned char vblue1 = (vector unsigned char)(
+        0x00, 0x01, 0x02, 0x11,
+        0x04, 0x05, 0x06, 0x13,
+        0x08, 0x09, 0x0a, 0x15,
+        0x0c, 0x0d, 0x0e, 0x17
+    );
+    vector unsigned char vblue2 = (vector unsigned char)(
+        vec_add((vector unsigned int)vblue1, v8)
+    );
+    /*
+        0x00 - 0x0f is ARxB ARxB ARxB ARxB
+        0x10 - 0x0e evens are green
+    */
+    vector unsigned char vgreen1 = (vector unsigned char)(
+        0x00, 0x01, 0x10, 0x03,
+        0x04, 0x05, 0x12, 0x07,
+        0x08, 0x09, 0x14, 0x0b,
+        0x0c, 0x0d, 0x16, 0x0f
+    );
+    vector unsigned char vgreen2 = (vector unsigned char)(
+        vec_add((vector unsigned int)vgreen1, vec_sl(v8, v8))
+    );
+    
+
+    assert(srcfmt->BytesPerPixel == 2);
+    assert(dstfmt->BytesPerPixel == 4);
+
+    vf800 = (vector unsigned short)vec_splat_u8(-7);
+    vf800 = vec_sl(vf800, vec_splat_u16(8));
+
+    if (dstfmt->Amask && srcfmt->alpha) {
+        ((unsigned char *)&valpha)[0] = alpha = srcfmt->alpha;
+        valpha = vec_splat(valpha, 0);
+    } else {
+        alpha = 0;
+        valpha = vec_splat_u8(0);
+    }
+
+    vpermute = calc_swizzle32(NULL, dstfmt);
+    while (height--) {
+        vector unsigned char valigner;
+        vector unsigned char voverflow;
+        vector unsigned char vsrc;
+
+        int width = info->d_width;
+        int extrawidth;
+
+        /* do scalar until we can align... */
+#define ONE_PIXEL_BLEND(condition, widthvar) \
+        while (condition) { \
+            unsigned sR, sG, sB; \
+            unsigned short pixel = *((unsigned short *)src); \
+            sR = (pixel >> 8) & 0xf8; \
+            sG = (pixel >> 3) & 0xfc; \
+            sB = (pixel << 3) & 0xf8; \
+            ASSEMBLE_RGBA(dst, 4, dstfmt, sR, sG, sB, alpha); \
+            src += 2; \
+            dst += 4; \
+            widthvar--; \
+        }
+        ONE_PIXEL_BLEND(((UNALIGNED_PTR(dst)) && (width)), width);
+
+        /* After all that work, here's the vector part! */
+        extrawidth = (width % 8);  /* trailing unaligned stores */
+        width -= extrawidth;
+        vsrc = vec_ld(0, src);
+        valigner = VEC_ALIGNER(src);
+
+        while (width) {
+            vector unsigned short vR, vG, vB;
+            vector unsigned char vdst1, vdst2;
+
+            voverflow = vec_ld(15, src);
+            vsrc = vec_perm(vsrc, voverflow, valigner);
+
+            vR = vec_and((vector unsigned short)vsrc, vf800);
+            vB = vec_sl((vector unsigned short)vsrc, v3);
+            vG = vec_sl(vB, v2);
+
+            vdst1 = (vector unsigned char)vec_perm((vector unsigned char)vR, valpha, vredalpha1);
+            vdst1 = vec_perm(vdst1, (vector unsigned char)vB, vblue1);
+            vdst1 = vec_perm(vdst1, (vector unsigned char)vG, vgreen1);
+            vdst1 = vec_perm(vdst1, valpha, vpermute);
+            vec_st(vdst1, 0, dst);
+
+            vdst2 = (vector unsigned char)vec_perm((vector unsigned char)vR, valpha, vredalpha2);
+            vdst2 = vec_perm(vdst2, (vector unsigned char)vB, vblue2);
+            vdst2 = vec_perm(vdst2, (vector unsigned char)vG, vgreen2);
+            vdst2 = vec_perm(vdst2, valpha, vpermute);
+            vec_st(vdst2, 16, dst);
+            
+            width -= 8;
+            dst += 32;
+            src += 16;
+            vsrc = voverflow;
+        }
+
+        assert(width == 0);
+
+
+        /* do scalar until we can align... */
+        ONE_PIXEL_BLEND((extrawidth), extrawidth);
+#undef ONE_PIXEL_BLEND
+
+        src += srcskip;  /* move to next row, accounting for pitch. */
+        dst += dstskip;
+    }
+
+}
+
+static void BlitNtoNKey(SDL_BlitInfo *info);
+static void BlitNtoNKeyCopyAlpha(SDL_BlitInfo *info);
+static void Blit32to32KeyAltivec(SDL_BlitInfo *info)
+{
+    int height = info->d_height;
+    Uint32 *srcp = (Uint32 *) info->s_pixels;
+    int srcskip = info->s_skip;
+    Uint32 *dstp = (Uint32 *) info->d_pixels;
+    int dstskip = info->d_skip;
+    SDL_PixelFormat *srcfmt = info->src;
+    int srcbpp = srcfmt->BytesPerPixel;
+    SDL_PixelFormat *dstfmt = info->dst;
+    int dstbpp = dstfmt->BytesPerPixel;
+    int copy_alpha = (srcfmt->Amask && dstfmt->Amask);
+	unsigned alpha = dstfmt->Amask ? srcfmt->alpha : 0;
+    Uint32 rgbmask = srcfmt->Rmask | srcfmt->Gmask | srcfmt->Bmask;
+	Uint32 ckey = info->src->colorkey;
+    vector unsigned int valpha;
+    vector unsigned char vpermute;
+    vector unsigned char vzero;
+    vector unsigned int vckey;
+    vector unsigned int vrgbmask;
+    vpermute = calc_swizzle32(srcfmt, dstfmt);
+    if (info->d_width < 16) {
+        if(copy_alpha) {
+            return BlitNtoNKeyCopyAlpha(info);
+        } else {
+            return BlitNtoNKey(info);
+        }
+    }
+    vzero = vec_splat_u8(0);
+    if (alpha) {
+        ((unsigned char *)&valpha)[0] = (unsigned char)alpha;
+        valpha = (vector unsigned int)vec_splat((vector unsigned char)valpha, 0);
+    } else {
+        valpha = (vector unsigned int)vzero;
+    }
+    ckey &= rgbmask;
+    ((unsigned int *)&vckey)[0] = ckey;
+    vckey = vec_splat(vckey, 0);
+    ((unsigned int *)&vrgbmask)[0] = rgbmask;
+    vrgbmask = vec_splat(vrgbmask, 0);
+
+    while (height--) {
+#define ONE_PIXEL_BLEND(condition, widthvar) \
+        if (copy_alpha) { \
+            while (condition) { \
+                Uint32 pixel; \
+                unsigned sR, sG, sB, sA; \
+                DISEMBLE_RGBA((Uint8 *)srcp, srcbpp, srcfmt, pixel, \
+                          sR, sG, sB, sA); \
+                if ( (pixel & rgbmask) != ckey ) { \
+                      ASSEMBLE_RGBA((Uint8 *)dstp, dstbpp, dstfmt, \
+                            sR, sG, sB, sA); \
+                } \
+                ((Uint8 *)dstp) += dstbpp; \
+                ((Uint8 *)srcp) += srcbpp; \
+                widthvar--; \
+            } \
+        } else { \
+            while (condition) { \
+                Uint32 pixel; \
+                unsigned sR, sG, sB; \
+                RETRIEVE_RGB_PIXEL((Uint8 *)srcp, srcbpp, pixel); \
+                if ( pixel != ckey ) { \
+                    RGB_FROM_PIXEL(pixel, srcfmt, sR, sG, sB); \
+                    ASSEMBLE_RGBA((Uint8 *)dstp, dstbpp, dstfmt, \
+                              sR, sG, sB, alpha); \
+                } \
+                ((Uint8 *)dstp) += dstbpp; \
+                ((Uint8 *)srcp) += srcbpp; \
+                widthvar--; \
+            } \
+        }
+        int width = info->d_width;
+        ONE_PIXEL_BLEND((UNALIGNED_PTR(dstp)) && (width), width);
+        assert(width > 0);
+        if (width > 0) {
+            int extrawidth = (width % 4);
+            vector unsigned char valigner = VEC_ALIGNER(srcp);
+            vector unsigned int vs = vec_ld(0, srcp);
+            width -= extrawidth;
+            assert(width >= 4);
+            while (width) {
+                vector unsigned char vsel;
+                vector unsigned int vd;
+                vector unsigned int voverflow = vec_ld(15, srcp);
+                /* load the source vec */
+                vs = vec_perm(vs, voverflow, valigner);
+                /* vsel is set for items that match the key */
+                vsel = (vector unsigned char)vec_and(vs, vrgbmask);
+                vsel = (vector unsigned char)vec_cmpeq(vs, vckey);
+                /* permute the src vec to the dest format */
+                vs = vec_perm(vs, valpha, vpermute);
+                /* load the destination vec */
+                vd = vec_ld(0, dstp);
+                /* select the source and dest into vs */
+                vd = (vector unsigned int)vec_sel((vector unsigned char)vs, (vector unsigned char)vd, vsel);
+                
+                vec_st(vd, 0, dstp);
+                srcp += 4;
+                width -= 4;
+                dstp += 4;
+                vs = voverflow;
+            }
+            ONE_PIXEL_BLEND((extrawidth), extrawidth);
+#undef ONE_PIXEL_BLEND
+            srcp += srcskip >> 2;
+            dstp += dstskip >> 2;
+        }
+    }
+}
+
+/* Altivec code to swizzle one 32-bit surface to a different 32-bit format. */
+/* Use this on a G5 */
+static void ConvertAltivec32to32_noprefetch(SDL_BlitInfo *info)
+{
+    int height = info->d_height;
+    Uint32 *src = (Uint32 *) info->s_pixels;
+    int srcskip = info->s_skip;
+    Uint32 *dst = (Uint32 *) info->d_pixels;
+    int dstskip = info->d_skip;
+    SDL_PixelFormat *srcfmt = info->src;
+    int srcbpp = srcfmt->BytesPerPixel;
+    SDL_PixelFormat *dstfmt = info->dst;
+    int dstbpp = dstfmt->BytesPerPixel;
+    vector unsigned int vzero = vec_splat_u32(0);
+    vector unsigned char vpermute = calc_swizzle32(srcfmt, dstfmt);
+    if (dstfmt->Amask && !srcfmt->Amask) {
+        if (srcfmt->alpha) {
+            vector unsigned char valpha;
+            ((unsigned char *)&valpha)[0] = srcfmt->alpha;
+            vzero = (vector unsigned int)vec_splat(valpha, 0);
+        }
+    }
+
+    assert(srcbpp == 4);
+    assert(dstbpp == 4);
+
+    while (height--) {
+        vector unsigned char valigner;
+        vector unsigned int vbits;
+        vector unsigned int voverflow;
+        Uint32 bits;
+        Uint8 r, g, b, a;
+
+        int width = info->d_width;
+        int extrawidth;
+
+        /* do scalar until we can align... */
+        while ((UNALIGNED_PTR(dst)) && (width)) {
+            bits = *(src++);
+            RGBA_FROM_8888(bits, srcfmt, r, g, b, a);
+            *(dst++) = MAKE8888(dstfmt, r, g, b, a);
+            width--;
+        }
+
+        /* After all that work, here's the vector part! */
+        extrawidth = (width % 4);
+        width -= extrawidth;
+        valigner = VEC_ALIGNER(src);
+        vbits = vec_ld(0, src);
+
+       while (width) {
+            voverflow = vec_ld(15, src);
+            src += 4;
+            width -= 4;
+            vbits = vec_perm(vbits, voverflow, valigner);  /* src is ready. */
+            vbits = vec_perm(vbits, vzero, vpermute);  /* swizzle it. */
+            vec_st(vbits, 0, dst);  /* store it back out. */
+            dst += 4;
+            vbits = voverflow;
+        }
+
+        assert(width == 0);
+
+        /* cover pixels at the end of the row that didn't fit in 16 bytes. */
+        while (extrawidth) {
+            bits = *(src++);  /* max 7 pixels, don't bother with prefetch. */
+            RGBA_FROM_8888(bits, srcfmt, r, g, b, a);
+            *(dst++) = MAKE8888(dstfmt, r, g, b, a);
+            extrawidth--;
+        }
+
+        src += srcskip >> 2;  /* move to next row, accounting for pitch. */
+        dst += dstskip >> 2;
+    }
+
+}
+
+/* Altivec code to swizzle one 32-bit surface to a different 32-bit format. */
+/* Use this on a G4 */
+static void ConvertAltivec32to32_prefetch(SDL_BlitInfo *info)
+{
+    const int scalar_dst_lead = sizeof (Uint32) * 4;
+    const int vector_dst_lead = sizeof (Uint32) * 16;
+
+    int height = info->d_height;
+    Uint32 *src = (Uint32 *) info->s_pixels;
+    int srcskip = info->s_skip;
+    Uint32 *dst = (Uint32 *) info->d_pixels;
+    int dstskip = info->d_skip;
+    SDL_PixelFormat *srcfmt = info->src;
+    int srcbpp = srcfmt->BytesPerPixel;
+    SDL_PixelFormat *dstfmt = info->dst;
+    int dstbpp = dstfmt->BytesPerPixel;
+    vector unsigned int vzero = vec_splat_u32(0);
+    vector unsigned char vpermute = calc_swizzle32(srcfmt, dstfmt);
+    if (dstfmt->Amask && !srcfmt->Amask) {
+        if (srcfmt->alpha) {
+            vector unsigned char valpha;
+            ((unsigned char *)&valpha)[0] = srcfmt->alpha;
+            vzero = (vector unsigned int)vec_splat(valpha, 0);
+        }
+    }
+
+    assert(srcbpp == 4);
+    assert(dstbpp == 4);
+
+    while (height--) {
+        vector unsigned char valigner;
+        vector unsigned int vbits;
+        vector unsigned int voverflow;
+        Uint32 bits;
+        Uint8 r, g, b, a;
+
+        int width = info->d_width;
+        int extrawidth;
+
+        /* do scalar until we can align... */
+        while ((UNALIGNED_PTR(dst)) && (width)) {
+            vec_dstt(src+scalar_dst_lead, DST_CTRL(2,32,1024), DST_CHAN_SRC);
+            vec_dstst(dst+scalar_dst_lead, DST_CTRL(2,32,1024), DST_CHAN_DEST);
+            bits = *(src++);
+            RGBA_FROM_8888(bits, srcfmt, r, g, b, a);
+            *(dst++) = MAKE8888(dstfmt, r, g, b, a);
+            width--;
+        }
+
+        /* After all that work, here's the vector part! */
+        extrawidth = (width % 4);
+        width -= extrawidth;
+        valigner = VEC_ALIGNER(src);
+        vbits = vec_ld(0, src);
+
+        while (width) {
+            vec_dstt(src+vector_dst_lead, DST_CTRL(2,32,1024), DST_CHAN_SRC);
+            vec_dstst(dst+vector_dst_lead, DST_CTRL(2,32,1024), DST_CHAN_DEST);
+            voverflow = vec_ld(15, src);
+            src += 4;
+            width -= 4;
+            vbits = vec_perm(vbits, voverflow, valigner);  /* src is ready. */
+            vbits = vec_perm(vbits, vzero, vpermute);  /* swizzle it. */
+            vec_st(vbits, 0, dst);  /* store it back out. */
+            dst += 4;
+            vbits = voverflow;
+        }
+        
+        assert(width == 0);
+
+        /* cover pixels at the end of the row that didn't fit in 16 bytes. */
+        while (extrawidth) {
+            bits = *(src++);  /* max 7 pixels, don't bother with prefetch. */
+            RGBA_FROM_8888(bits, srcfmt, r, g, b, a);
+            *(dst++) = MAKE8888(dstfmt, r, g, b, a);
+            extrawidth--;
+        }
+
+        src += srcskip >> 2;  /* move to next row, accounting for pitch. */
+        dst += dstskip >> 2;
+    }
+
+    vec_dss(DST_CHAN_SRC);
+    vec_dss(DST_CHAN_DEST);
+}
+
+static Uint32 GetBlitFeatures( void )
+{
+    static Uint32 features = 0xffffffff;
+    if (features == 0xffffffff) {
+        /* Provide an override for testing .. */
+        char *override = getenv("SDL_ALTIVEC_BLIT_FEATURES");
+        if (override) {
+            features = 0;
+            sscanf(override, "%u", &features);
+        } else {
+            features = ( 0
+                /* Feature 1 is has-MMX */
+                | ((SDL_HasMMX()) ? 1 : 0)
+                /* Feature 2 is has-AltiVec */
+                | ((SDL_HasAltiVec()) ? 2 : 0)
+                /* Feature 4 is dont-use-prefetch */
+                | ((GetL3CacheSize() == 0) ? 4 : 0)
+            );
+        }
+    }
+    return features;
+}
+#else
+/* Feature 1 is has-MMX */
+#define GetBlitFeatures() ((Uint32)(SDL_HasMMX() ? 1 : 0))
+#endif
+
 #ifdef USE_ASMBLIT
 
 /* Heheheh, we coerce Hermes into using SDL blit information */
@@ -406,11 +1056,7 @@
 
 
 /* Special optimized blit for RGB 5-6-5 --> 32-bit RGB surfaces */
-#if ( SDL_BYTEORDER == SDL_LIL_ENDIAN )
-#define RGB565_32(dst, src, map) (map[src[0]*2] + map[src[1]*2+1])
-#else /* ( SDL_BYTEORDER == SDL_BIG_ENDIAN ) */
-#define RGB565_32(dst, src, map) (map[src[1]*2] + map[src[0]*2+1])
-#endif
+#define RGB565_32(dst, src, map) (map[src[LO]*2] + map[src[HI]*2+1])
 static void Blit_RGB565_32(SDL_BlitInfo *info, const Uint32 *map)
 {
 #ifndef USE_DUFFS_LOOP
@@ -1422,10 +2068,10 @@
 	Uint32 srcR, srcG, srcB;
 	int dstbpp;
 	Uint32 dstR, dstG, dstB;
-	SDL_bool cpu_mmx;
+	Uint32 blit_features;
 	void *aux_data;
 	SDL_loblit blitfunc;
-        enum { NO_ALPHA, SET_ALPHA, COPY_ALPHA } alpha;
+	enum { NO_ALPHA=1, SET_ALPHA=2, COPY_ALPHA=4 } alpha;
 };
 static const struct blit_table normal_blit_1[] = {
 	/* Default for 8-bit RGB source, an invalid combination */
@@ -1440,6 +2086,11 @@
     { 0x0000F800,0x000007E0,0x0000001F, 2, 0x0000001F,0x000003E0,0x00007C00,
       0, ConvertX86p16_16BGR555, ConvertX86, NO_ALPHA },
 #endif
+#ifdef USE_ALTIVEC_BLITTERS
+    /* has-altivec */
+    { 0x0000F800,0x000007E0,0x0000001F, 4, 0x00000000,0x00000000,0x00000000,
+      2, NULL, Blit_RGB565_32Altivec, NO_ALPHA | COPY_ALPHA | SET_ALPHA },
+#endif
     { 0x0000F800,0x000007E0,0x0000001F, 4, 0x00FF0000,0x0000FF00,0x000000FF,
       0, NULL, Blit_RGB565_ARGB8888, SET_ALPHA },
     { 0x0000F800,0x000007E0,0x0000001F, 4, 0x000000FF,0x0000FF00,0x00FF0000,
@@ -1485,6 +2136,17 @@
     { 0x00FF0000,0x0000FF00,0x000000FF, 4, 0x0000FF00,0x00FF0000,0xFF000000,
       0, ConvertX86p32_32BGRA888, ConvertX86, NO_ALPHA },
 #else
+#ifdef USE_ALTIVEC_BLITTERS
+    /* has-altivec | dont-use-prefetch */
+    { 0x00000000,0x00000000,0x00000000, 4, 0x00000000,0x00000000,0x00000000,
+      6, NULL, ConvertAltivec32to32_noprefetch, NO_ALPHA | COPY_ALPHA | SET_ALPHA },
+    /* has-altivec */
+    { 0x00000000,0x00000000,0x00000000, 4, 0x00000000,0x00000000,0x00000000,
+      2, NULL, ConvertAltivec32to32_prefetch, NO_ALPHA | COPY_ALPHA | SET_ALPHA },
+    /* has-altivec */
+    { 0x00000000,0x00000000,0x00000000, 2, 0x0000F800,0x000007E0,0x0000001F,
+      2, NULL, Blit_RGB888_RGB565Altivec, NO_ALPHA },
+#endif
     { 0x00FF0000,0x0000FF00,0x000000FF, 2, 0x0000F800,0x000007E0,0x0000001F,
       0, NULL, Blit_RGB888_RGB565, NO_ALPHA },
     { 0x00FF0000,0x0000FF00,0x000000FF, 2, 0x00007C00,0x000003E0,0x0000001F,
@@ -1497,6 +2159,9 @@
 	normal_blit_1, normal_blit_2, normal_blit_3, normal_blit_4
 };
 
+/* Mask matches table, or table entry is zero */
+#define MASKOK(x, y) (((x) == (y)) || ((y) == 0x00000000))
+
 SDL_loblit SDL_CalculateBlitN(SDL_Surface *surface, int blit_index)
 {
 	struct private_swaccel *sdata;
@@ -1532,6 +2197,12 @@
 	    else if(dstfmt->BytesPerPixel == 1)
 		return BlitNto1Key;
 	    else {
+#ifdef USE_ALTIVEC_BLITTERS
+        if((srcfmt->BytesPerPixel == 4) && (dstfmt->BytesPerPixel == 4) && SDL_HasAltiVec()) {
+            return Blit32to32KeyAltivec;
+        } else
+#endif
+
 		if(srcfmt->Amask && dstfmt->Amask)
 		    return BlitNtoNKeyCopyAlpha;
 		else
@@ -1561,20 +2232,20 @@
 		}
 	} else {
 		/* Now the meat, choose the blitter we want */
-	        int a_need = 0;
+		int a_need = 0;
 		if(dstfmt->Amask)
 		    a_need = srcfmt->Amask ? COPY_ALPHA : SET_ALPHA;
 		table = normal_blit[srcfmt->BytesPerPixel-1];
-		for ( which=0; table[which].srcR; ++which ) {
-			if ( srcfmt->Rmask == table[which].srcR &&
-			     srcfmt->Gmask == table[which].srcG &&
-			     srcfmt->Bmask == table[which].srcB &&
-			     dstfmt->BytesPerPixel == table[which].dstbpp &&
-			     dstfmt->Rmask == table[which].dstR &&
-			     dstfmt->Gmask == table[which].dstG &&
-			     dstfmt->Bmask == table[which].dstB &&
-			     (a_need & table[which].alpha) == a_need &&
-			     (table[which].cpu_mmx == SDL_HasMMX())) 
+		for ( which=0; table[which].dstbpp; ++which ) {
+			if ( MASKOK(srcfmt->Rmask, table[which].srcR) &&
+			    MASKOK(srcfmt->Gmask, table[which].srcG) &&
+			    MASKOK(srcfmt->Bmask, table[which].srcB) &&
+			    MASKOK(dstfmt->Rmask, table[which].dstR) &&
+			    MASKOK(dstfmt->Gmask, table[which].dstG) &&
+			    MASKOK(dstfmt->Bmask, table[which].dstB) &&
+			    dstfmt->BytesPerPixel == table[which].dstbpp &&
+			    (a_need & table[which].alpha) == a_need &&
+			    ((table[which].blit_features & GetBlitFeatures()) == table[which].blit_features) )
 				break;
 		}
 		sdata->aux_data = table[which].aux_data;