nouveau: always enable at least one RC

Experimentally, this is required for glxgears and others to display the
proper colors. This is also what the code used to do before the
referenced commit.

Fixes: c703658b396 (mesa: Drop _EnabledUnits.)
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: mesa-stable@lists.freedesktop.org
(cherry picked from commit 357d8261f1e9fd93105dd704c94828582dc02043)

diff --git a/src/mesa/drivers/dri/nouveau/nv20_state_frag.c b/src/mesa/drivers/dri/nouveau/nv20_state_frag.c
index 492ecdc..2c5c2db 100644 (file)
--- a/src/mesa/drivers/dri/nouveau/nv20_state_frag.c
+++ b/src/mesa/drivers/dri/nouveau/nv20_state_frag.c
@@ -67,5 +67,5 @@ nv20_emit_frag(struct gl_context *ctx, int emit)
        PUSH_DATA (push, in >> 32);
 
        BEGIN_NV04(push, NV20_3D(RC_ENABLE), 1);
-       PUSH_DATA (push, n);
+       PUSH_DATA (push, MAX2(1, n));
 }