gallium: add initial support for conservative rasterization

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

21 files changed, 243 insertions, 2 deletions

diff --git a/src/gallium/docs/source/cso/rasterizer.rst b/src/gallium/docs/source/cso/rasterizer.rst
index 616e4511a2d..4dabcc032f5 100644
--- a/src/gallium/docs/source/cso/rasterizer.rst
+++ b/src/gallium/docs/source/cso/rasterizer.rst
@@ -340,3 +340,26 @@ clip_plane_enable
     If any clip distance output is written, those half-spaces for which no
     clip distance is written count as disabled; i.e. user clip planes and
     shader clip distances cannot be mixed, and clip distances take precedence.
+
+conservative_raster_mode
+    The conservative rasterization mode.  For PIPE_CONSERVATIVE_RASTER_OFF,
+    conservative rasterization is disabled.  For IPE_CONSERVATIVE_RASTER_POST_SNAP
+    or PIPE_CONSERVATIVE_RASTER_PRE_SNAP, conservative rasterization is nabled.
+    When conservative rasterization is enabled, the polygon smooth, line mooth,
+    point smooth and line stipple settings are ignored.
+    With the post-snap mode, unlike the pre-snap mode, fragments are never
+    generated for degenerate primitives.  Degenerate primitives, when rasterized,
+    are considered back-facing and the vertex attributes and depth are that of
+    the provoking vertex.
+    If the post-snap mode is used with an unsupported primitive, the pre-snap
+    mode is used, if supported.  Behavior is similar for the pre-snap mode.
+    If the pre-snap mode is used, fragments are generated with respect to the primitive
+    before vertex snapping.
+
+conservative_raster_dilate
+    The amount of dilation during conservative rasterization.
+
+subpixel_precision_x
+    A bias added to the horizontal subpixel precision during conservative rasterization.
+subpixel_precision_y
+    A bias added to the vertical subpixel precision during conservative rasterization.
diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
index 3837360fb40..5bc6ee99f08 100644
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -420,6 +420,18 @@ The integer capabilities:
   by the driver, and the driver can throw assertion failures.
 * ``PIPE_CAP_PACKED_UNIFORMS``: True if the driver supports packed uniforms
   as opposed to padding to vec4s.
+* ``PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES``: Whether the
+  PIPE_CONSERVATIVE_RASTER_POST_SNAP mode is supported for triangles.
+* ``PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES``: Whether the
+PIPE_CONSERVATIVE_RASTER_POST_SNAP mode is supported for points and lines.
+* ``PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES``: Whether the
+PIPE_CONSERVATIVE_RASTER_PRE_SNAP mode is supported for triangles.
+* ``PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES``: Whether the
+PIPE_CONSERVATIVE_RASTER_PRE_SNAP mode is supported for points and lines.
+* ``PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE``: Whether PIPE_CAP_POST_DEPTH_COVERAGE
+works with conservative rasterization.
+* ``PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS``: The maximum
+subpixel precision bias in bits during conservative rasterization.
 
 
 .. _pipe_capf:
@@ -437,6 +449,12 @@ The floating-point capabilities are:
   applied to anisotropically filtered textures.
 * ``PIPE_CAPF_MAX_TEXTURE_LOD_BIAS``: The maximum :term:`LOD` bias that may be applied
   to filtered textures.
+* ``PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE``: The minimum conservative rasterization
+  dilation.
+* ``PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE``: The maximum conservative rasterization
+  dilation.
+* ``PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY``: The conservative rasterization
+  dilation granularity for values relative to the minimum dilation.
 
 
 .. _pipe_shader_cap:
diff --git a/src/gallium/drivers/etnaviv/etnaviv_screen.c b/src/gallium/drivers/etnaviv/etnaviv_screen.c
index b0f8b4bebe3..cada83609a8 100644
--- a/src/gallium/drivers/etnaviv/etnaviv_screen.c
+++ b/src/gallium/drivers/etnaviv/etnaviv_screen.c
@@ -273,6 +273,12 @@ etna_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_CONTEXT_PRIORITY_MASK:
    case PIPE_CAP_FENCE_SIGNAL:
    case PIPE_CAP_CONSTBUF0_FLAGS:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+   case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
    case PIPE_CAP_PACKED_UNIFORMS:
       return 0;
 
@@ -374,6 +380,10 @@ etna_screen_get_paramf(struct pipe_screen *pscreen, enum pipe_capf param)
       return 16.0f;
    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
       return util_last_bit(screen->specs.max_texture_size);
+   case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+   case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+   case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+      return 0.0f;
    }
 
    debug_printf("unknown paramf %d", param);
diff --git a/src/gallium/drivers/freedreno/freedreno_screen.c b/src/gallium/drivers/freedreno/freedreno_screen.c
index f338d756dfe..c59995c75d1 100644
--- a/src/gallium/drivers/freedreno/freedreno_screen.c
+++ b/src/gallium/drivers/freedreno/freedreno_screen.c
@@ -340,6 +340,12 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_FENCE_SIGNAL:
 	case PIPE_CAP_CONSTBUF0_FLAGS:
 	case PIPE_CAP_PACKED_UNIFORMS:
+	case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+	case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+	case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+	case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+	case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+	case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
 		return 0;
 
 	case PIPE_CAP_CONTEXT_PRIORITY_MASK:
@@ -479,6 +485,10 @@ fd_screen_get_paramf(struct pipe_screen *pscreen, enum pipe_capf param)
 		return 16.0f;
 	case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
 		return 15.0f;
+	case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+	case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+	case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+		return 0.0f;
 	}
 	debug_printf("unknown paramf %d\n", param);
 	return 0;
diff --git a/src/gallium/drivers/i915/i915_screen.c b/src/gallium/drivers/i915/i915_screen.c
index 59d2ec66284..9d99238f2b7 100644
--- a/src/gallium/drivers/i915/i915_screen.c
+++ b/src/gallium/drivers/i915/i915_screen.c
@@ -283,6 +283,12 @@ i915_get_param(struct pipe_screen *screen, enum pipe_cap cap)
    case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
    case PIPE_CAP_POLYGON_MODE_FILL_RECTANGLE:
    case PIPE_CAP_POST_DEPTH_COVERAGE:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+   case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
       return 0;
 
    case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
@@ -435,6 +441,13 @@ i915_get_paramf(struct pipe_screen *screen, enum pipe_capf cap)
    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
       return 16.0;
 
+   case PIPE_CAPF_MIN_CONSERVTIVE_RASTER_DILATE:
+      /* fall-through */
+   case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+      /* fall-through */
+   case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+      return 0.0f;
+
    default:
       debug_printf("%s: Unknown cap %u.\n", __FUNCTION__, cap);
       return 0;
diff --git a/src/gallium/drivers/llvmpipe/lp_screen.c b/src/gallium/drivers/llvmpipe/lp_screen.c
index 3f5d0327bf9..af1aff4e1e0 100644
--- a/src/gallium/drivers/llvmpipe/lp_screen.c
+++ b/src/gallium/drivers/llvmpipe/lp_screen.c
@@ -362,6 +362,12 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_FENCE_SIGNAL:
    case PIPE_CAP_CONSTBUF0_FLAGS:
    case PIPE_CAP_PACKED_UNIFORMS:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+   case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
       return 0;
    }
    /* should only get here on unhandled cases */
@@ -422,6 +428,12 @@ llvmpipe_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
       return 16.0; /* not actually signficant at this time */
    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
       return 16.0; /* arbitrary */
+   case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+      return 0.0;
+   case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+      return 0.0;
+   case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+      return 0.0;
    }
    /* should only get here on unhandled cases */
    debug_printf("Unexpected PIPE_CAP %d query\n", param);
diff --git a/src/gallium/drivers/nouveau/nv30/nv30_screen.c b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
index 1d1fbaad607..a24176a8e94 100644
--- a/src/gallium/drivers/nouveau/nv30/nv30_screen.c
+++ b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
@@ -229,6 +229,12 @@ nv30_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_FENCE_SIGNAL:
    case PIPE_CAP_CONSTBUF0_FLAGS:
    case PIPE_CAP_PACKED_UNIFORMS:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+   case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:
@@ -270,6 +276,10 @@ nv30_screen_get_paramf(struct pipe_screen *pscreen, enum pipe_capf param)
       return (eng3d->oclass >= NV40_3D_CLASS) ? 16.0 : 8.0;
    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
       return 15.0;
+   case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+   case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+   case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+      return 0.0;
    default:
       debug_printf("unknown paramf %d\n", param);
       return 0;
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_screen.c b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
index 6fd2982e3cb..1db112fa6c7 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_screen.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
@@ -281,6 +281,12 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_FENCE_SIGNAL:
    case PIPE_CAP_CONSTBUF0_FLAGS:
    case PIPE_CAP_PACKED_UNIFORMS:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+   case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:
@@ -398,6 +404,10 @@ nv50_screen_get_paramf(struct pipe_screen *pscreen, enum pipe_capf param)
       return 16.0f;
    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
       return 4.0f;
+   case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+   case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+   case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+      return 0.0f;
    }
 
    NOUVEAU_ERR("unknown PIPE_CAPF %d\n", param);
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
index eb50149b647..37e43f02e36 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
@@ -309,6 +309,12 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_FENCE_SIGNAL:
    case PIPE_CAP_CONSTBUF0_FLAGS:
    case PIPE_CAP_PACKED_UNIFORMS:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+   case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:
@@ -450,6 +456,10 @@ nvc0_screen_get_paramf(struct pipe_screen *pscreen, enum pipe_capf param)
       return 16.0f;
    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
       return 15.0f;
+   case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+   case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+   case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+      return 0.0f;
    }
 
    NOUVEAU_ERR("unknown PIPE_CAPF %d\n", param);
diff --git a/src/gallium/drivers/r300/r300_screen.c b/src/gallium/drivers/r300/r300_screen.c
index 8ea2e87ce68..8a6e0c2f21f 100644
--- a/src/gallium/drivers/r300/r300_screen.c
+++ b/src/gallium/drivers/r300/r300_screen.c
@@ -251,6 +251,12 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
         case PIPE_CAP_FENCE_SIGNAL:
         case PIPE_CAP_CONSTBUF0_FLAGS:
         case PIPE_CAP_PACKED_UNIFORMS:
+        case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+        case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+        case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+        case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+        case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+        case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
             return 0;
 
         /* SWTCL-only features. */
@@ -475,6 +481,10 @@ static float r300_get_paramf(struct pipe_screen* pscreen,
             return 16.0f;
         case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
             return 16.0f;
+        case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+        case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+        case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+            return 0.0f;
         default:
             debug_printf("r300: Warning: Unknown CAP %d in get_paramf.\n",
                          param);
diff --git a/src/gallium/drivers/r600/r600_pipe.c b/src/gallium/drivers/r600/r600_pipe.c
index 43f2dfae7ec..102e75035f9 100644
--- a/src/gallium/drivers/r600/r600_pipe.c
+++ b/src/gallium/drivers/r600/r600_pipe.c
@@ -415,6 +415,12 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_FENCE_SIGNAL:
 	case PIPE_CAP_CONSTBUF0_FLAGS:
 	case PIPE_CAP_PACKED_UNIFORMS:
+	case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+	case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+	case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+	case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+	case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+	case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
 		return 0;
 
 	case PIPE_CAP_DOUBLES:
diff --git a/src/gallium/drivers/r600/r600_pipe_common.c b/src/gallium/drivers/r600/r600_pipe_common.c
index 255a1e01b7f..e1d899b0fe0 100644
--- a/src/gallium/drivers/r600/r600_pipe_common.c
+++ b/src/gallium/drivers/r600/r600_pipe_common.c
@@ -910,6 +910,10 @@ static float r600_get_paramf(struct pipe_screen* pscreen,
 		return 16.0f;
 	case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
 		return 16.0f;
+    case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+    case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+    case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+        return 0.0f;
 	}
 	return 0.0f;
 }
diff --git a/src/gallium/drivers/radeonsi/si_get.c b/src/gallium/drivers/radeonsi/si_get.c
index 04ab0f46bbd..d4e0eab187d 100644
--- a/src/gallium/drivers/radeonsi/si_get.c
+++ b/src/gallium/drivers/radeonsi/si_get.c
@@ -277,6 +277,12 @@ static int si_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_TILE_RASTER_ORDER:
 	case PIPE_CAP_MAX_COMBINED_SHADER_OUTPUT_RESOURCES:
 	case PIPE_CAP_CONTEXT_PRIORITY_MASK:
+	case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+	case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+	case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+	case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+	case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+	case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
 		return 0;
 
 	case PIPE_CAP_FENCE_SIGNAL:
@@ -376,6 +382,10 @@ static float si_get_paramf(struct pipe_screen* pscreen, enum pipe_capf param)
 		return 16.0f;
 	case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
 		return 16.0f;
+	case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+	case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+	case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+		return 0.0f;
 	}
 	return 0.0f;
 }
diff --git a/src/gallium/drivers/softpipe/sp_screen.c b/src/gallium/drivers/softpipe/sp_screen.c
index 25f6f74f366..f9c786ae75d 100644
--- a/src/gallium/drivers/softpipe/sp_screen.c
+++ b/src/gallium/drivers/softpipe/sp_screen.c
@@ -314,6 +314,12 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_FENCE_SIGNAL:
    case PIPE_CAP_CONSTBUF0_FLAGS:
    case PIPE_CAP_PACKED_UNIFORMS:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+   case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
       return 0;
    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
       return 4;
@@ -362,6 +368,12 @@ softpipe_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
       return 16.0;
    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
       return 16.0; /* arbitrary */
+   case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+      return 0.0;
+   case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+      return 0.0;
+   case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+      return 0.0;
    }
    /* should only get here on unhandled cases */
    debug_printf("Unexpected PIPE_CAPF %d query\n", param);
diff --git a/src/gallium/drivers/svga/svga_screen.c b/src/gallium/drivers/svga/svga_screen.c
index f5f07fa75eb..82d7c98b685 100644
--- a/src/gallium/drivers/svga/svga_screen.c
+++ b/src/gallium/drivers/svga/svga_screen.c
@@ -167,6 +167,13 @@ svga_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
       return 15.0;
 
+   case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+      /* fall-through */
+   case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+      /* fall-through */
+   case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+      return 0.0f;
+
    }
 
    debug_printf("Unexpected PIPE_CAPF_ query %u\n", param);
@@ -373,6 +380,12 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_PCI_DEVICE:
    case PIPE_CAP_PCI_FUNCTION:
    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+   case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
       return 0;
    case PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT:
       return 64;
diff --git a/src/gallium/drivers/swr/swr_screen.cpp b/src/gallium/drivers/swr/swr_screen.cpp
index 880a177c399..738792bf08b 100644
--- a/src/gallium/drivers/swr/swr_screen.cpp
+++ b/src/gallium/drivers/swr/swr_screen.cpp
@@ -347,6 +347,12 @@ swr_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_FENCE_SIGNAL:
    case PIPE_CAP_CONSTBUF0_FLAGS:
    case PIPE_CAP_PACKED_UNIFORMS:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+   case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:
@@ -400,6 +406,10 @@ swr_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
       return 0.0;
    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
       return 16.0; /* arbitrary */
+   case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+   case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+   case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+      return 0.0f;
    }
    /* should only get here on unhandled cases */
    debug_printf("Unexpected PIPE_CAPF %d query\n", param);
diff --git a/src/gallium/drivers/vc4/vc4_screen.c b/src/gallium/drivers/vc4/vc4_screen.c
index cead71b77cd..81c8049325f 100644
--- a/src/gallium/drivers/vc4/vc4_screen.c
+++ b/src/gallium/drivers/vc4/vc4_screen.c
@@ -287,7 +287,13 @@ vc4_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
         case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
         case PIPE_CAP_CONTEXT_PRIORITY_MASK:
         case PIPE_CAP_FENCE_SIGNAL:
-	case PIPE_CAP_CONSTBUF0_FLAGS:
+        case PIPE_CAP_CONSTBUF0_FLAGS:
+        case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+        case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+        case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+        case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+        case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+        case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
         case PIPE_CAP_PACKED_UNIFORMS:
                 return 0;
 
@@ -375,6 +381,11 @@ vc4_screen_get_paramf(struct pipe_screen *pscreen, enum pipe_capf param)
                 return 0.0f;
         case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
                 return 0.0f;
+
+        case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+        case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+        case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+                return 0.0f;
         default:
                 fprintf(stderr, "unknown paramf %d\n", param);
                 return 0;
diff --git a/src/gallium/drivers/vc5/vc5_screen.c b/src/gallium/drivers/vc5/vc5_screen.c
index 271c2c878bb..a287a5e0ebd 100644
--- a/src/gallium/drivers/vc5/vc5_screen.c
+++ b/src/gallium/drivers/vc5/vc5_screen.c
@@ -259,7 +259,13 @@ vc5_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
         case PIPE_CAP_STREAM_OUTPUT_INTERLEAVE_BUFFERS:
         case PIPE_CAP_MAX_COMBINED_SHADER_OUTPUT_RESOURCES:
         case PIPE_CAP_CONTEXT_PRIORITY_MASK:
-	case PIPE_CAP_CONSTBUF0_FLAGS:
+        case PIPE_CAP_CONSTBUF0_FLAGS:
+        case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+        case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+        case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+        case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+        case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+        case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
         case PIPE_CAP_PACKED_UNIFORMS:
                 return 0;
 
@@ -333,6 +339,11 @@ vc5_screen_get_paramf(struct pipe_screen *pscreen, enum pipe_capf param)
                 return 0.0f;
         case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
                 return 16.0f;
+
+        case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+        case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+        case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+                return 0.0f;
         default:
                 fprintf(stderr, "unknown paramf %d\n", param);
                 return 0;
diff --git a/src/gallium/drivers/virgl/virgl_screen.c b/src/gallium/drivers/virgl/virgl_screen.c
index 02613f18663..ab35b1fe2c7 100644
--- a/src/gallium/drivers/virgl/virgl_screen.c
+++ b/src/gallium/drivers/virgl/virgl_screen.c
@@ -276,6 +276,12 @@ virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_FENCE_SIGNAL:
    case PIPE_CAP_CONSTBUF0_FLAGS:
    case PIPE_CAP_PACKED_UNIFORMS:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+   case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
       return 0;
    case PIPE_CAP_VENDOR_ID:
       return 0x1af4;
@@ -373,6 +379,10 @@ virgl_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
       return 16.0;
    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
       return vscreen->caps.caps.v2.max_texture_lod_bias;
+   case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
+   case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
+   case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
+      return 0.0f;
    }
    /* should only get here on unhandled cases */
    debug_printf("Unexpected PIPE_CAPF %d query\n", param);
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index c4ae0532060..6b2f33b9e37 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -607,6 +607,17 @@ enum pipe_reset_status
 
 
 /**
+ * Conservative rasterization modes.
+ */
+enum pipe_conservative_raster_mode
+{
+   PIPE_CONSERVATIVE_RASTER_OFF,
+   PIPE_CONSERVATIVE_RASTER_POST_SNAP,
+   PIPE_CONSERVATIVE_RASTER_PRE_SNAP,
+};
+
+
+/**
  * resource_get_handle flags.
  */
 /* Requires pipe_context::flush_resource before external use. */
@@ -795,6 +806,12 @@ enum pipe_cap
    PIPE_CAP_FENCE_SIGNAL,
    PIPE_CAP_CONSTBUF0_FLAGS,
    PIPE_CAP_PACKED_UNIFORMS,
+   PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES,
+   PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES,
+   PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES,
+   PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES,
+   PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS,
+   PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE,
 };
 
 /**
@@ -834,6 +851,9 @@ enum pipe_capf
    PIPE_CAPF_MAX_POINT_WIDTH_AA,
    PIPE_CAPF_MAX_TEXTURE_ANISOTROPY,
    PIPE_CAPF_MAX_TEXTURE_LOD_BIAS,
+   PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE,
+   PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE,
+   PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY,
 };
 
 /** Shader caps not specific to any single stage */
diff --git a/src/gallium/include/pipe/p_state.h b/src/gallium/include/pipe/p_state.h
index 4dce399f848..db9fa1a8e9f 100644
--- a/src/gallium/include/pipe/p_state.h
+++ b/src/gallium/include/pipe/p_state.h
@@ -113,6 +113,7 @@ struct pipe_rasterizer_state
    unsigned line_smooth:1;
    unsigned line_stipple_enable:1;
    unsigned line_last_pixel:1;
+   unsigned conservative_raster_mode:2; /**< PIPE_CONSERVATIVE_RASTER_x */
 
    /**
     * Use the first vertex of a primitive as the provoking vertex for
@@ -123,6 +124,12 @@ struct pipe_rasterizer_state
    unsigned half_pixel_center:1;
    unsigned bottom_edge_rule:1;
 
+   /*
+    * Conservative rasterization subpixel precision bias in bits
+    */
+   unsigned subpixel_precision_x:4;
+   unsigned subpixel_precision_y:4;
+
    /**
     * When true, rasterization is disabled and no pixels are written.
     * This only makes sense with the Stream Out functionality.
@@ -186,6 +193,7 @@ struct pipe_rasterizer_state
    float offset_units;
    float offset_scale;
    float offset_clamp;
+   float conservative_raster_dilate;
 };