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, 28 insertions, 0 deletions

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;
 };