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zink: reduce blendfactor when alpha_to_one is set

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if alpha is 1, some of these blendfactors can be reduced to simpler ones

Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8513>
This commit is contained in:
Mike Blumenkrantz
2020-08-14 11:39:00 -04:00
committed by Marge Bot
parent 7b48d5d36e
commit 011fea1a90
1 changed files with 19 additions and 4 deletions
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src/gallium/drivers/zink/zink_state.c
+19 -4
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@@ -201,6 +201,21 @@ logic_op(enum pipe_logicop func)
unreachable("unexpected logicop function");
}
/* from iris */
static enum pipe_blendfactor
fix_blendfactor(enum pipe_blendfactor f, bool alpha_to_one)
{
if (alpha_to_one) {
if (f == PIPE_BLENDFACTOR_SRC1_ALPHA)
return PIPE_BLENDFACTOR_ONE;
if (f == PIPE_BLENDFACTOR_INV_SRC1_ALPHA)
return PIPE_BLENDFACTOR_ZERO;
}
return f;
}
static void *
zink_create_blend_state(struct pipe_context *pctx,
const struct pipe_blend_state *blend_state)
@@ -235,11 +250,11 @@ zink_create_blend_state(struct pipe_context *pctx,
if (rt->blend_enable) {
att.blendEnable = VK_TRUE;
att.srcColorBlendFactor = blend_factor(rt->rgb_src_factor);
att.dstColorBlendFactor = blend_factor(rt->rgb_dst_factor);
att.srcColorBlendFactor = blend_factor(fix_blendfactor(rt->rgb_src_factor, cso->alpha_to_one));
att.dstColorBlendFactor = blend_factor(fix_blendfactor(rt->rgb_dst_factor, cso->alpha_to_one));
att.colorBlendOp = blend_op(rt->rgb_func);
att.srcAlphaBlendFactor = blend_factor(rt->alpha_src_factor);
att.dstAlphaBlendFactor = blend_factor(rt->alpha_dst_factor);
att.srcAlphaBlendFactor = blend_factor(fix_blendfactor(rt->alpha_src_factor, cso->alpha_to_one));
att.dstAlphaBlendFactor = blend_factor(fix_blendfactor(rt->alpha_dst_factor, cso->alpha_to_one));
att.alphaBlendOp = blend_op(rt->alpha_func);
if (need_blend_constants(rt->rgb_src_factor) ||