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-rw-r--r--src/gallium/drivers/radeonsi/si_state.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/src/gallium/drivers/radeonsi/si_state.c b/src/gallium/drivers/radeonsi/si_state.c
index 911e979a4fb..1ccf5b6b214 100644
--- a/src/gallium/drivers/radeonsi/si_state.c
+++ b/src/gallium/drivers/radeonsi/si_state.c
@@ -557,6 +557,17 @@ static void *si_create_blend_state_mode(struct pipe_context *ctx,
}
if (sctx->b.family == CHIP_STONEY) {
+ /* Disable RB+ blend optimizations for dual source blending.
+ * Vulkan does this.
+ */
+ if (blend->dual_src_blend) {
+ for (int i = 0; i < 8; i++) {
+ sx_mrt_blend_opt[i] =
+ S_028760_COLOR_COMB_FCN(V_028760_OPT_COMB_NONE) |
+ S_028760_ALPHA_COMB_FCN(V_028760_OPT_COMB_NONE);
+ }
+ }
+
for (int i = 0; i < 8; i++)
si_pm4_set_reg(pm4, R_028760_SX_MRT0_BLEND_OPT + i * 4,
sx_mrt_blend_opt[i]);