From 8b8c51573bc568d70404a7d898ed07a8d2877bd8 Mon Sep 17 00:00:00 2001 From: Sam Lantinga Date: Wed, 29 Oct 2025 16:11:25 +0000 Subject: [PATCH] Disabled incorrect 16-bit Altivec blitters --- src/video/SDL_blit_N.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/src/video/SDL_blit_N.c b/src/video/SDL_blit_N.c index bdf1681616..63468cd3a0 100644 --- a/src/video/SDL_blit_N.c +++ b/src/video/SDL_blit_N.c @@ -292,6 +292,7 @@ static void Blit_XRGB8888_RGB565Altivec(SDL_BlitInfo *info) } } +#ifdef BROKEN_ALTIVEC_BLITTERS // This doesn't properly expand to the lower destination bits static void Blit_RGB565_32Altivec(SDL_BlitInfo *info) { int height = info->dst_h; @@ -370,9 +371,7 @@ static void Blit_RGB565_32Altivec(SDL_BlitInfo *info) while (condition) { \ unsigned sR, sG, sB; \ unsigned short Pixel = *((unsigned short *)src); \ - sR = (Pixel >> 8) & 0xf8; \ - sG = (Pixel >> 3) & 0xfc; \ - sB = (Pixel << 3) & 0xf8; \ + RGB_FROM_RGB565(Pixel, sR, sG, sB); \ ASSEMBLE_RGBA(dst, 4, dstfmt, sR, sG, sB, alpha); \ src += 2; \ dst += 4; \ @@ -508,9 +507,7 @@ static void Blit_RGB555_32Altivec(SDL_BlitInfo *info) while (condition) { \ unsigned sR, sG, sB; \ unsigned short Pixel = *((unsigned short *)src); \ - sR = (Pixel >> 7) & 0xf8; \ - sG = (Pixel >> 2) & 0xf8; \ - sB = (Pixel << 3) & 0xf8; \ + RGB_FROM_RGB555(Pixel, sR, sG, sB); \ ASSEMBLE_RGBA(dst, 4, dstfmt, sR, sG, sB, alpha); \ src += 2; \ dst += 4; \ @@ -567,6 +564,7 @@ static void Blit_RGB555_32Altivec(SDL_BlitInfo *info) dst += dstskip; } } +#endif // BROKEN_ALTIVEC_BLITTERS static void BlitNtoNKey(SDL_BlitInfo *info); static void BlitNtoNKeyCopyAlpha(SDL_BlitInfo *info); @@ -2969,11 +2967,13 @@ static const struct blit_table normal_blit_1[] = { static const struct blit_table normal_blit_2[] = { #ifdef SDL_ALTIVEC_BLITTERS +#ifdef BROKEN_ALTIVEC_BLITTERS // has-altivec { 0x0000F800, 0x000007E0, 0x0000001F, 4, 0x00000000, 0x00000000, 0x00000000, BLIT_FEATURE_HAS_ALTIVEC, Blit_RGB565_32Altivec, NO_ALPHA | COPY_ALPHA | SET_ALPHA }, { 0x00007C00, 0x000003E0, 0x0000001F, 4, 0x00000000, 0x00000000, 0x00000000, BLIT_FEATURE_HAS_ALTIVEC, Blit_RGB555_32Altivec, NO_ALPHA | COPY_ALPHA | SET_ALPHA }, +#endif // BROKEN_ALTIVEC_BLITTERS #endif #ifdef SDL_SSE4_1_INTRINSICS { 0x0000F800, 0x000007E0, 0x0000001F, 4, 0x00FF0000, 0x0000FF00, 0x000000FF,