[Mesa-dev] [PATCH] nvc0: provide support for unscaled poly offset units

[Ilia Mirkin]

On at least Kepler hardware, the units differ based on RT format. Emit a
properly scaled value for Z16 depth buffers vs other formats, to help
out st/nine.

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
---
 src/gallium/drivers/nouveau/nvc0/nvc0_screen.c      |  2 +-
 .../drivers/nouveau/nvc0/nvc0_state_validate.c      | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
index 8c46b2a..ce6bd8b 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
@@ -234,6 +234,7 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
    case PIPE_CAP_COMPUTE:
    case PIPE_CAP_TGSI_VOTE:
+   case PIPE_CAP_POLYGON_OFFSET_UNITS_UNSCALED:
       return 1;
    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
       return (class_3d >= NVE4_3D_CLASS) ? 1 : 0;
@@ -263,7 +264,6 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_PCI_BUS:
    case PIPE_CAP_PCI_DEVICE:
    case PIPE_CAP_PCI_FUNCTION:
-   case PIPE_CAP_POLYGON_OFFSET_UNITS_UNSCALED:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_state_validate.c b/src/gallium/drivers/nouveau/nvc0/nvc0_state_validate.c
index 05c15ce..ea0bd23 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_state_validate.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_state_validate.c
@@ -672,6 +672,26 @@ nvc0_validate_derived_3(struct nvc0_context *nvc0)
 }
 
 static void
+nvc0_validate_derived_4(struct nvc0_context *nvc0)
+{
+   struct nouveau_pushbuf *push = nvc0->base.pushbuf;
+   struct pipe_framebuffer_state *fb = &nvc0->framebuffer;
+   struct pipe_rasterizer_state *rast = &nvc0->rast->pipe;
+
+   if (!rast)
+      return;
+
+   if (rast->offset_units_unscaled) {
+      BEGIN_NVC0(push, NVC0_3D(POLYGON_OFFSET_UNITS), 1);
+      if (fb->zsbuf && fb->zsbuf->format == PIPE_FORMAT_Z16_UNORM)
+         PUSH_DATAf(push, rast->offset_units * (1 << 16));
+      else
+         PUSH_DATAf(push, rast->offset_units * (1 << 24));
+   }
+}
+
+
+static void
 nvc0_validate_tess_state(struct nvc0_context *nvc0)
 {
    struct nouveau_pushbuf *push = nvc0->base.pushbuf;
@@ -754,6 +774,7 @@ validate_list_3d[] = {
                                    NVC0_NEW_3D_RASTERIZER },
     { nvc0_validate_derived_2,     NVC0_NEW_3D_ZSA | NVC0_NEW_3D_FRAMEBUFFER },
     { nvc0_validate_derived_3,     NVC0_NEW_3D_BLEND | NVC0_NEW_3D_FRAMEBUFFER },
+    { nvc0_validate_derived_4,     NVC0_NEW_3D_RASTERIZER | NVC0_NEW_3D_FRAMEBUFFER },
     { nvc0_validate_clip,          NVC0_NEW_3D_CLIP | NVC0_NEW_3D_RASTERIZER |
                                    NVC0_NEW_3D_VERTPROG |
                                    NVC0_NEW_3D_TEVLPROG |
-- 
2.7.3