Mesa (master): nvc0: implement the color buffer 0 is integer rule for alpha-to-one/cov

[Ilia Mirkin]

Module: Mesa
Branch: master
Commit: 1af0641db345209c076e9b1ba4dca7524541671a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=1af0641db345209c076e9b1ba4dca7524541671a

Author: Ilia Mirkin <imirkin at alum.mit.edu>
Date:   Mon Aug 17 04:08:01 2015 -0400

nvc0: implement the color buffer 0 is integer rule for alpha-to-one/cov

The hardware checks for multisampling being enabled, but does not have
the rule about cbuf0 being an integer format. Only enable
alpha-to-one/alpha-to-coverage if cbuf0 is not an integer format.

Fixes piglits
  ext_framebuffer_multisample-int-draw-buffers-alpha-to-one
  ext_framebuffer_multisample-int-draw-buffers-alpha-to-coverage

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>

---

 src/gallium/drivers/nouveau/nvc0/nvc0_state.c      |   10 ----------
 .../drivers/nouveau/nvc0/nvc0_state_validate.c     |   21 ++++++++++++++++++++
 src/gallium/drivers/nouveau/nvc0/nvc0_stateobj.h   |    2 +-
 3 files changed, 22 insertions(+), 11 deletions(-)

diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_state.c b/src/gallium/drivers/nouveau/nvc0/nvc0_state.c
index 25183a6..ee29912 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_state.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_state.c
@@ -90,7 +90,6 @@ nvc0_blend_state_create(struct pipe_context *pipe,
    struct nvc0_blend_stateobj *so = CALLOC_STRUCT(nvc0_blend_stateobj);
    int i;
    int r; /* reference */
-   uint32_t ms;
    uint8_t blend_en = 0;
    bool indep_masks = false;
    bool indep_funcs = false;
@@ -176,15 +175,6 @@ nvc0_blend_state_create(struct pipe_context *pipe,
       }
    }
 
-   ms = 0;
-   if (cso->alpha_to_coverage)
-      ms |= NVC0_3D_MULTISAMPLE_CTRL_ALPHA_TO_COVERAGE;
-   if (cso->alpha_to_one)
-      ms |= NVC0_3D_MULTISAMPLE_CTRL_ALPHA_TO_ONE;
-
-   SB_BEGIN_3D(so, MULTISAMPLE_CTRL, 1);
-   SB_DATA    (so, ms);
-
    assert(so->size <= (sizeof(so->state) / sizeof(so->state[0])));
    return so;
 }
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_state_validate.c b/src/gallium/drivers/nouveau/nvc0/nvc0_state_validate.c
index ce1119c..47bd66d 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_state_validate.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_state_validate.c
@@ -1,4 +1,5 @@
 
+#include "util/u_format.h"
 #include "util/u_math.h"
 
 #include "nvc0/nvc0_context.h"
@@ -555,6 +556,25 @@ nvc0_validate_derived_2(struct nvc0_context *nvc0)
 }
 
 static void
+nvc0_validate_derived_3(struct nvc0_context *nvc0)
+{
+   struct nouveau_pushbuf *push = nvc0->base.pushbuf;
+   struct pipe_framebuffer_state *fb = &nvc0->framebuffer;
+   uint32_t ms = 0;
+
+   if ((!fb->nr_cbufs || !fb->cbufs[0] ||
+        !util_format_is_pure_integer(fb->cbufs[0]->format)) && nvc0->blend) {
+      if (nvc0->blend->pipe.alpha_to_coverage)
+         ms |= NVC0_3D_MULTISAMPLE_CTRL_ALPHA_TO_COVERAGE;
+      if (nvc0->blend->pipe.alpha_to_one)
+         ms |= NVC0_3D_MULTISAMPLE_CTRL_ALPHA_TO_ONE;
+   }
+
+   BEGIN_NVC0(push, NVC0_3D(MULTISAMPLE_CTRL), 1);
+   PUSH_DATA (push, ms);
+}
+
+static void
 nvc0_validate_tess_state(struct nvc0_context *nvc0)
 {
    struct nouveau_pushbuf *push = nvc0->base.pushbuf;
@@ -628,6 +648,7 @@ static struct state_validate {
     { nvc0_validate_derived_1,     NVC0_NEW_FRAGPROG | NVC0_NEW_ZSA |
                                    NVC0_NEW_RASTERIZER },
     { nvc0_validate_derived_2,     NVC0_NEW_ZSA | NVC0_NEW_FRAMEBUFFER },
+    { nvc0_validate_derived_3,     NVC0_NEW_BLEND | NVC0_NEW_FRAMEBUFFER },
     { nvc0_validate_clip,          NVC0_NEW_CLIP | NVC0_NEW_RASTERIZER |
                                    NVC0_NEW_VERTPROG |
                                    NVC0_NEW_TEVLPROG |
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_stateobj.h b/src/gallium/drivers/nouveau/nvc0/nvc0_stateobj.h
index 18fcc12..8bc33c6 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_stateobj.h
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_stateobj.h
@@ -17,7 +17,7 @@
 struct nvc0_blend_stateobj {
    struct pipe_blend_state pipe;
    int size;
-   uint32_t state[72];
+   uint32_t state[70];
 };
 
 struct nvc0_rasterizer_stateobj {