On Wed, Feb 19, 2014 at 2:04 AM, Kenneth Graunke <kenn...@whitecape.org> wrote:
> These enumerations are simply log2 of the number of multisamples shifted
> by a bit, so we can calculate them using ffs() in a lot less code.
>
> Suggested by Eric Anholt.
>
> Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
> ---
> src/mesa/drivers/dri/i965/gen8_multisample_state.c | 26
> +++-------------------
> 1 file changed, 3 insertions(+), 23 deletions(-)
>
> diff --git a/src/mesa/drivers/dri/i965/gen8_multisample_state.c
> b/src/mesa/drivers/dri/i965/gen8_multisample_state.c
> index 64c7208..bfe0d5b 100644
> --- a/src/mesa/drivers/dri/i965/gen8_multisample_state.c
> +++ b/src/mesa/drivers/dri/i965/gen8_multisample_state.c
> @@ -33,33 +33,13 @@
> void
> gen8_emit_3dstate_multisample(struct brw_context *brw, unsigned num_samples)
> {
> - uint32_t number_of_multisamples = 0;
> + assert(num_samples <= 16);
>
> - switch (num_samples) {
> - case 0:
> - case 1:
> - number_of_multisamples = MS_NUMSAMPLES_1;
> - break;
> - case 2:
> - number_of_multisamples = MS_NUMSAMPLES_2;
> - break;
> - case 4:
> - number_of_multisamples = MS_NUMSAMPLES_4;
> - break;
> - case 8:
> - number_of_multisamples = MS_NUMSAMPLES_8;
> - break;
> - case 16:
> - number_of_multisamples = MS_NUMSAMPLES_16;
> - break;
> - default:
> - assert(!"Unrecognized num_samples in gen8_emit_3dstate_multisample");
> - break;
> - }
> + unsigned log2_samples = ffs(MAX2(num_samples, 1)) - 1;
>
> BEGIN_BATCH(2);
> OUT_BATCH(GEN8_3DSTATE_MULTISAMPLE << 16 | (2 - 2));
> - OUT_BATCH(MS_PIXEL_LOCATION_CENTER | number_of_multisamples);
> + OUT_BATCH(MS_PIXEL_LOCATION_CENTER | log2_samples << 1);
> ADVANCE_BATCH();
> }
>
> --
> 1.8.4.2
>
> _______________________________________________
> mesa-dev mailing list
> mesa-dev@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/mesa-dev
This series is:
Reviewed-by: Anuj Phogat <anuj.pho...@gmail.com>
_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/mesa-dev
