src/video/SDL_blit_copy.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 16 Dec 2009 03:02:31 +0000
changeset 3577 72024425b437
parent 2859 99210400e8b9
child 3697 f7b03b6838cb
permissions -rw-r--r--
Fixed bug #736 Don't use the SSE cache instruction in MMX code if SSE isn't available. :)
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2009 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#include "SDL_video.h"
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#include "SDL_blit.h"
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#include "SDL_blit_copy.h"
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#ifdef __SSE__
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/* This assumes 16-byte aligned src and dst */
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static __inline__ void
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SDL_memcpySSE(Uint8 * dst, const Uint8 * src, int len)
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{
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    int i;
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    __m128 values[4];
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    for (i = len / 64; i--;) {
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        _mm_prefetch(src, _MM_HINT_NTA);
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        values[0] = *(__m128 *) (src + 0);
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        values[1] = *(__m128 *) (src + 16);
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        values[2] = *(__m128 *) (src + 32);
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        values[3] = *(__m128 *) (src + 48);
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        _mm_stream_ps((float *) (dst + 0), values[0]);
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        _mm_stream_ps((float *) (dst + 16), values[1]);
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        _mm_stream_ps((float *) (dst + 32), values[2]);
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        _mm_stream_ps((float *) (dst + 48), values[3]);
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        src += 64;
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        dst += 64;
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    }
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    if (len & 63)
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        SDL_memcpy(dst, src, len & 63);
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}
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#endif /* __SSE__ */
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#ifdef __MMX__
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#ifdef _MSC_VER
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#pragma warning(disable:4799)
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#endif
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/* This assumes 8-byte aligned src and dst */
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static __inline__ void
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SDL_memcpyMMX(Uint8 * dst, const Uint8 * src, int len)
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{
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    int i;
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    __m64 values[8];
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    for (i = len / 64; i--;) {
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#ifdef __SSE__
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        _mm_prefetch(src, _MM_HINT_NTA);
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#endif
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        values[0] = *(__m64 *) (src + 0);
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        values[1] = *(__m64 *) (src + 8);
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        values[2] = *(__m64 *) (src + 16);
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        values[3] = *(__m64 *) (src + 24);
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        values[4] = *(__m64 *) (src + 32);
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        values[5] = *(__m64 *) (src + 40);
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        values[6] = *(__m64 *) (src + 48);
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        values[7] = *(__m64 *) (src + 56);
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        _mm_stream_pi((__m64 *) (dst + 0), values[0]);
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        _mm_stream_pi((__m64 *) (dst + 8), values[1]);
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        _mm_stream_pi((__m64 *) (dst + 16), values[2]);
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        _mm_stream_pi((__m64 *) (dst + 24), values[3]);
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        _mm_stream_pi((__m64 *) (dst + 32), values[4]);
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        _mm_stream_pi((__m64 *) (dst + 40), values[5]);
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        _mm_stream_pi((__m64 *) (dst + 48), values[6]);
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        _mm_stream_pi((__m64 *) (dst + 56), values[7]);
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        src += 64;
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        dst += 64;
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    }
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    if (len & 63)
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        SDL_memcpy(dst, src, len & 63);
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}
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#endif /* __MMX__ */
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void
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SDL_BlitCopy(SDL_BlitInfo * info)
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{
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    Uint8 *src, *dst;
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    int w, h;
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    int srcskip, dstskip;
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    w = info->dst_w * info->dst_fmt->BytesPerPixel;
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    h = info->dst_h;
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    src = info->src;
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    dst = info->dst;
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    srcskip = info->src_pitch;
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    dstskip = info->dst_pitch;
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#ifdef __SSE__
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    if (SDL_HasSSE() &&
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        !((uintptr_t) src & 15) && !(srcskip & 15) &&
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        !((uintptr_t) dst & 15) && !(dstskip & 15)) {
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        while (h--) {
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            SDL_memcpySSE(dst, src, w);
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            src += srcskip;
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            dst += dstskip;
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        }
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        return;
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    }
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#endif
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#ifdef __MMX__
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    if (SDL_HasMMX() &&
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        !((uintptr_t) src & 7) && !(srcskip & 7) &&
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        !((uintptr_t) dst & 7) && !(dstskip & 7)) {
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        while (h--) {
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            SDL_memcpyMMX(dst, src, w);
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            src += srcskip;
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            dst += dstskip;
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        }
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        _mm_empty();
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        return;
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    }
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#endif
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    while (h--) {
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        SDL_memcpy(dst, src, w);
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        src += srcskip;
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        dst += dstskip;
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    }
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}
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void
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SDL_BlitCopyOverlap(SDL_BlitInfo * info)
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{
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    Uint8 *src, *dst;
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    int w, h;
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    int skip;
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    w = info->dst_w * info->dst_fmt->BytesPerPixel;
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    h = info->dst_h;
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    src = info->src;
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    dst = info->dst;
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    skip = info->src_pitch;
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    if ((dst < src) || (dst >= (src + h * skip))) {
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        SDL_BlitCopy(info);
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    } else {
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        src += ((h - 1) * skip);
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        dst += ((h - 1) * skip);
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        while (h--) {
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            SDL_revcpy(dst, src, w);
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            src -= skip;
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            dst -= skip;
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        }
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    }
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}
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/* vi: set ts=4 sw=4 expandtab: */