source/sw_block.h


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#define BLOCK_SIZE  ( 1 << BLOCK_SHIFT )

void BLOCK_FUNC( void ){
    int             v, i, b, lightstep, lighttemp, light;
    byte    pix, *psource, *prowdest;

    psource = pbasesource;
    prowdest = prowdestbase;

    for (v=0 ; v<r_numvblocks ; v++)
    {
    // FIXME: make these locals?
    // FIXME: use delta rather than both right and left, like ASM?
        lightleft = r_lightptr[0];
        lightright = r_lightptr[1];
        r_lightptr += r_lightwidth;
        lightleftstep = (r_lightptr[0] - lightleft) >> BLOCK_SHIFT;
        lightrightstep = (r_lightptr[1] - lightright) >> BLOCK_SHIFT;

        for (i=0 ; i<BLOCK_SIZE ; i++)
        {
            lighttemp = lightleft - lightright;
            lightstep = lighttemp >> BLOCK_SHIFT;

            light = lightright;

            for (b=BLOCK_SIZE-1; b>=0; b--)
            {
                pix = psource[b];
                prowdest[b] = ((unsigned char *)vid.colormap)
                        [(light & 0xFF00) + pix];
                light += lightstep;
            }
    
            psource += sourcetstep;
            lightright += lightrightstep;
            lightleft += lightleftstep;
            prowdest += surfrowbytes;
        }

        if (psource >= r_sourcemax)
            psource -= r_stepback;
    }
}

#undef BLOCK_FUNC
#undef BLOCK_SIZE
#undef BLOCK_SHIFT