Mesa (master): radeonsi: set CB_BLEND1_CONTROL.ENABLE for dual source blending

[Marek Olšák]

Module: Mesa
Branch: master
Commit: ff50c44a5fb4411715da828af5b8706c8a456d26
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=ff50c44a5fb4411715da828af5b8706c8a456d26

Author: Marek Olšák <marek.olsak at amd.com>
Date:   Sat Nov 26 15:43:39 2016 +0100

radeonsi: set CB_BLEND1_CONTROL.ENABLE for dual source blending

copied from Vulkan

Cc: 13.0 <mesa-stable at lists.freedesktop.org>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle at amd.com>

---

 src/gallium/drivers/radeonsi/si_state.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/gallium/drivers/radeonsi/si_state.c b/src/gallium/drivers/radeonsi/si_state.c
index 47b1148..911e979 100644
--- a/src/gallium/drivers/radeonsi/si_state.c
+++ b/src/gallium/drivers/radeonsi/si_state.c
@@ -454,6 +454,10 @@ static void *si_create_blend_state_mode(struct pipe_context *ctx,
 
 		/* Only set dual source blending for MRT0 to avoid a hang. */
 		if (i >= 1 && blend->dual_src_blend) {
+			/* Vulkan does this for dual source blending. */
+			if (i == 1)
+				blend_cntl |= S_028780_ENABLE(1);
+
 			si_pm4_set_reg(pm4, R_028780_CB_BLEND0_CONTROL + i * 4, blend_cntl);
 			continue;
 		}