[Mesa-dev] [PATCH 05/10] radeonsi: set CB_BLEND1_CONTROL.ENABLE for dual source blending

[Marek Olšák]

From: Marek Olšák <marek.olsak 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
@@ -447,20 +447,24 @@ static void *si_create_blend_state_mode(struct pipe_context *ctx,
 
 		unsigned srcRGB_opt, dstRGB_opt, srcA_opt, dstA_opt;
 		unsigned blend_cntl = 0;
 
 		sx_mrt_blend_opt[i] =
 			S_028760_COLOR_COMB_FCN(V_028760_OPT_COMB_BLEND_DISABLED) |
 			S_028760_ALPHA_COMB_FCN(V_028760_OPT_COMB_BLEND_DISABLED);
 
 		/* 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;
 		}
 
 		/* Only addition and subtraction equations are supported with
 		 * dual source blending.
 		 */
 		if (blend->dual_src_blend &&
 		    (eqRGB == PIPE_BLEND_MIN || eqRGB == PIPE_BLEND_MAX ||
 		     eqA == PIPE_BLEND_MIN || eqA == PIPE_BLEND_MAX)) {
-- 
2.7.4