gallium: document conservative rasterization flags

Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index 61c1a5335b5..304c3dcb2bb 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -644,7 +644,18 @@ enum pipe_reset_status
 enum pipe_conservative_raster_mode
 {
    PIPE_CONSERVATIVE_RASTER_OFF,
+
+   /**
+    * The post-snap mode means the conservative rasterization occurs after
+    * the conversion from floating-point to fixed-point coordinates
+    * on the subpixel grid.
+    */
    PIPE_CONSERVATIVE_RASTER_POST_SNAP,
+
+   /**
+    * The pre-snap mode means the conservative rasterization occurs before
+    * the conversion from floating-point to fixed-point coordinates.
+    */
    PIPE_CONSERVATIVE_RASTER_PRE_SNAP,
 };