flattexalphazc.h

Go to the documentation of this file.

inline void LeRasterizer::fillFlatTexAlphaZC(int y, int x1, int x2, int w1, int w2, int u1, int u2, int v1, int v2)
{
    int d = x2 - x1;
    if (d == 0) return;

    int au = (u2 - u1) / d;
    int av = (v2 - v1) / d;
    int aw = (w2 - w1) / d;

    if (++x2 > frame.tx) x2 = frame.tx;
    LeColor * p = x1 + y * frame.tx + pixels;

    __m128i sc = _mm_set1_epi32(0x01000100);
    for (int x = x1; x < x2; x ++) {
        int32_t z = (1 << 30) / (w1 >> 8);
        uint32_t tu = (((int64_t) u1 * z) >> 24) & texMaskU;
        uint32_t tv = (((int64_t) v1 * z) >> 24) & texMaskV;

        __m128i zv = _mm_set1_epi32(0);
        __m128i tp, fp;
        fp = _mm_loadl_epi64((__m128i *) p);
        tp = _mm_loadl_epi64((__m128i *) &texDiffusePixels[tu + (tv << texSizeU)]);
        fp = _mm_unpacklo_epi8(fp, zv);
        tp = _mm_unpacklo_epi8(tp, zv);

        __m128i ap;
        ap = _mm_shufflelo_epi16(tp, 0xFF);
        ap = _mm_sub_epi16(sc, ap);

        tp = _mm_mullo_epi16(tp, color_4);
        fp = _mm_mullo_epi16(fp, ap);
        tp = _mm_adds_epu16(tp, fp);
        tp = _mm_srli_epi16(tp, 8);
        tp = _mm_packus_epi16(tp, zv);
        *p++ = _mm_cvtsi128_si32(tp);

        u1 += au;
        v1 += av;
        w1 += aw;
    }
}