i965: Document brw_mask_reg().

Reviewed-by: Matt Turner <mattst88@gmail.com>

diff --git a/src/mesa/drivers/dri/i965/brw_reg.h b/src/mesa/drivers/dri/i965/brw_reg.h
index c03a8aed7961fc4c59edeac9795a77da794761c5..81a932063a734f4c44fd7c671df65810b5b03d18 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_reg.h
+++ b/src/mesa/drivers/dri/i965/brw_reg.h
@@ -778,7 +778,11 @@ brw_flag_reg(int reg, int subreg)
                       BRW_ARF_FLAG + reg, subreg);
 }
 
-
+/**
+ * Return the mask register present in Gen4-5, or the related register present
+ * in Gen7.5 and later hardware referred to as "channel enable" register in
+ * the documentation.
+ */
 static inline struct brw_reg
 brw_mask_reg(unsigned subnr)
 {