v3d: Fix MRT blending with independent blending disabled.

We were only emitting the RT blend state for RT 0 and only enabling it for
RT 0, when the gallium API for !independent_blend is for rt0's state to
apply to all of them.

Fixes piglit fbo-drawbuffers-blend-add.

1 files changed, 10 insertions, 5 deletions

diff --git a/src/gallium/drivers/v3d/v3dx_state.c b/src/gallium/drivers/v3d/v3dx_state.c
index f775c531e5f..a092b1fb9e1 100644
--- a/src/gallium/drivers/v3d/v3dx_state.c
+++ b/src/gallium/drivers/v3d/v3dx_state.c
@@ -126,12 +126,17 @@ v3d_create_blend_state(struct pipe_context *pctx,
 
         so->base = *cso;
 
-        for (int i = 0; i < VC5_MAX_DRAW_BUFFERS; i++) {
-                so->blend_enables |= cso->rt[i].blend_enable << i;
+        if (cso->independent_blend_enable) {
+                for (int i = 0; i < VC5_MAX_DRAW_BUFFERS; i++) {
+                        so->blend_enables |= cso->rt[i].blend_enable << i;
 
-                /* V3D 4.x is when we got independent blend enables. */
-                assert(V3D_VERSION >= 40 ||
-                       cso->rt[i].blend_enable == cso->rt[0].blend_enable);
+                        /* V3D 4.x is when we got independent blend enables. */
+                        assert(V3D_VERSION >= 40 ||
+                               cso->rt[i].blend_enable == cso->rt[0].blend_enable);
+                }
+        } else {
+                if (cso->rt[0].blend_enable)
+                        so->blend_enables = (1 << VC5_MAX_DRAW_BUFFERS) - 1;
         }
 
         return so;