colormask &= ps->colors_written_4bit;
else if (!ps->colors_written_4bit)
colormask = 0; /* color0 writes all cbufs, but it's not written */
colormask &= ps->colors_written_4bit;
else if (!ps->colors_written_4bit)
colormask = 0; /* color0 writes all cbufs, but it's not written */