/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

#include "SDL_cpuinfo.h"

#include "SDL_video.h"

#include "SDL_blit.h"

#include "SDL_blit_copy.h"

#ifdef __MMX__

static __inline__ void

SDL_memcpyMMX(Uint8 * dst, const Uint8 * src, int len)

{

    int i;

    __m64 values[8];

    for (i = len / 64; i--;) {

        _mm_prefetch(src, _MM_HINT_NTA);

        values[0] = *(__m64 *) (src + 0);

        values[1] = *(__m64 *) (src + 8);

        values[2] = *(__m64 *) (src + 16);

        values[3] = *(__m64 *) (src + 24);

        values[4] = *(__m64 *) (src + 32);

        values[5] = *(__m64 *) (src + 40);

        values[6] = *(__m64 *) (src + 48);

        values[7] = *(__m64 *) (src + 56);

        _mm_stream_pi((__m64 *) (dst + 0), values[0]);

        _mm_stream_pi((__m64 *) (dst + 8), values[1]);

        _mm_stream_pi((__m64 *) (dst + 16), values[2]);

        _mm_stream_pi((__m64 *) (dst + 24), values[3]);

        _mm_stream_pi((__m64 *) (dst + 32), values[4]);

        _mm_stream_pi((__m64 *) (dst + 40), values[5]);

        _mm_stream_pi((__m64 *) (dst + 48), values[6]);

        _mm_stream_pi((__m64 *) (dst + 56), values[7]);

        src += 64;

        dst += 64;

    }

    if (len & 63)

        SDL_memcpy(dst, src, len & 63);

}

#endif /* __MMX__ */

#ifdef __SSE__

static __inline__ void

SDL_memcpySSE(Uint8 * dst, const Uint8 * src, int len)

{

    int i;

    __m128 values[4];

    for (i = len / 64; i--;) {

        _mm_prefetch(src, _MM_HINT_NTA);

        values[0] = *(__m128 *) (src + 0);

        values[1] = *(__m128 *) (src + 16);

        values[2] = *(__m128 *) (src + 32);

        values[3] = *(__m128 *) (src + 48);

        _mm_stream_ps((float *) (dst + 0), values[0]);

        _mm_stream_ps((float *) (dst + 16), values[1]);

        _mm_stream_ps((float *) (dst + 32), values[2]);

        _mm_stream_ps((float *) (dst + 48), values[3]);

        src += 64;

        dst += 64;

    }

    if (len & 63)

        SDL_memcpy(dst, src, len & 63);

}

#endif /* __SSE__ */

void

SDL_BlitCopy(SDL_BlitInfo * info)

{

    Uint8 *src, *dst;

    int w, h;

    int srcskip, dstskip;

    w = info->d_width * info->dst->BytesPerPixel;

    h = info->d_height;

    src = info->s_pixels;

    dst = info->d_pixels;

    srcskip = w + info->s_skip;

    dstskip = w + info->d_skip;

#ifdef __SSE__

    if (SDL_HasSSE() && !((uintptr_t) src & 15) && !((uintptr_t) dst & 15)) {

        while (h--) {

            SDL_memcpySSE(dst, src, w);

            src += srcskip;

            dst += dstskip;

        }

        return;

    }

#endif

#ifdef __MMX__

    if (SDL_HasMMX() && !((uintptr_t) src & 7) && !((uintptr_t) dst & 7)) {

        while (h--) {

            SDL_memcpyMMX(dst, src, w);

            src += srcskip;

            dst += dstskip;

        }

        _mm_empty();

        return;

    }

#endif

    while (h--) {

        SDL_memcpy(dst, src, w);

        src += srcskip;

        dst += dstskip;

    }

}

void

SDL_BlitCopyOverlap(SDL_BlitInfo * info)

{

    Uint8 *src, *dst;

    int w, h;

    int skip;

    w = info->d_width * info->dst->BytesPerPixel;

    h = info->d_height;

    src = info->s_pixels;

    dst = info->d_pixels;

    skip = w + info->s_skip;

    if ((dst < src) || (dst >= (src + h * skip))) {

        SDL_BlitCopy(info);

    } else {

        src += ((h - 1) * skip);

        dst += ((h - 1) * skip);

        while (h--) {

            SDL_revcpy(dst, src, w);

            src -= skip;

            dst -= skip;

        }

    }

}

/* vi: set ts=4 sw=4 expandtab: */