gallium: add initial support for conservative rasterization

Signed-off-by: Rhys Perry <[email protected]>
Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>

2 files changed, 41 insertions, 0 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: