On Tuesday, July 19, 2016 4:33:18 PM PDT Timothy Arceri wrote:
> For example where n=3 first_component=1 this will give us
> 0xE (WRITEMASK_YZW).
>
> Reviewed-by: Edward O'Callaghan <funfunc...@folklore1984.net>
> ---
> src/mesa/drivers/dri/i965/brw_reg.h | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/src/mesa/drivers/dri/i965/brw_reg.h
> b/src/mesa/drivers/dri/i965/brw_reg.h
> index 7eab7b5..abd63e4 100644
> --- a/src/mesa/drivers/dri/i965/brw_reg.h
> +++ b/src/mesa/drivers/dri/i965/brw_reg.h
> @@ -972,6 +972,12 @@ brw_writemask_for_size(unsigned n)
> return (1 << n) - 1;
> }
>
> +static inline unsigned
> +brw_writemask_for_component_packing(unsigned n, unsigned first_component)
> +{
> + return (((1 << n) - 1) << first_component);
> +}
> +
> static inline struct brw_reg
> negate(struct brw_reg reg)
> {
> It would be nice to include an assert that first_component + n < 4, or equivalently, that (result & WRITEMASK_XYZW) == result.
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