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panfrost: Fix fixed-function blend on bifrost

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The conversion from a 32b float to a 16b fixed-point number was wrong.

Fixes: 8389976b7c ("panfrost: XML-ify the blend descriptors")
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7151>
This commit is contained in:
Boris Brezillon 2020-10-09 14:00:28 +02:00
parent 442f48f27b
commit d8326ceafb
1 changed files with 1 additions and 1 deletions
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2
src/gallium/drivers/panfrost/pan_cmdstream.c
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@ -311,7 +311,7 @@ panfrost_emit_bifrost_blend(struct panfrost_batch *batch,
cfg.bifrost.equation = blend[i].equation.equation;
/* Fixed point constant */
u16 constant = blend[i].equation.constant / ((1 << chan_size) - 1);
u16 constant = blend[i].equation.constant * ((1 << chan_size) - 1);
constant <<= 16 - chan_size;
cfg.bifrost.constant = constant;