Minor perf improvement to fall and expand use of struct.

    int* current = loadArrayI32(RSID_RIPPLE_MAP, index * rippleMapSize + origin);

    int *map = loadArrayI32(RSID_REFRACTION_MAP, 0);

    float *vertices = loadTriangleMeshVerticesF(NAMED_WaterMesh);

    struct vert_s *vert = (struct vert_s *)vertices;

    float fw = 1.f / width;

    float fh = 1.f / height;

        int w = width - 1;

        int wave = *current;

        int offset = h * width;

        struct vert_s *vtx = vert + offset + w;

        while (w >= 0) {

            int nextWave = current[1];

            int dx = nextWave - wave;

            v &= ~(v >> 31);

            if (v >= height) v = height - 1;

            int index = (offset + w) << 3;

            vertices[index + 3] = u * fw;

            vertices[index + 4] = v * fh;

            // Update Z coordinate of the vertex

            vertices[index + 7] = dy * fy;

            vtx->s = u * fw;

            vtx->t = v * fh;

            vtx->z = dy * fy;

            vtx --;

            w -= 1;

            current += 1;

    // Compute the normals for lighting

    int y = 0;

    int w8 = width << 3;

    for ( ; y < height; y += 1) {

        int x = 0;

        int yOffset = y * width;

        for ( ; x < width; x += 1) {

            struct vert_s *v = (struct vec3_s *)(vertices + x);

            //int o = ((yOffset + x) << 3);

            //int o1 = o + 8 + 5;

            //int ow = o + w8 + 5;

            //int ow1 = ow + 8;

        struct vert_s *v = vert;

        for ( ; x < width; x += 1) {

            struct vec3_s n1, n2, n3;

            vec3Sub(&n1, (struct vec3_s *)&(v+1)->x, (struct vec3_s *)&v->x);

            vec3Sub(&n2, (struct vec3_s *)&(v+width)->x, (struct vec3_s *)&v->x);

            v->nx = n3.x;

            v->ny = n3.y;

            v->nz = -n3.z;

            v += 1;

            // reset Z

            //vertices[(yOffset + x) << 3 + 7] = 0.0f;

    drawRiverbed();

    drawSky();

    drawLighting();

    //drawLeaves();

    drawLeaves();

    //drawNormals();

    return 1;