/* there's lot of ways how to do this. We just use first few bits,
since we have no knowledge of sample positions here. When
app-supplied mask though is used too might need to be smarter.
- Also, there's a interface restriction here in theory it is
+ Also, there's an interface restriction here in theory it is
encouraged this mask not be the same at each pixel. */
sample_mask = (1 << nr_bits) - 1;
if (st->ctx->Multisample.SampleCoverageInvert)