i965: add helpers for creating component layout swizzle

This will be used to swizzle components to the beginning or end
of the vector based on the component layout qualifier and whether
we are doing a load or store.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>

diff --git a/src/mesa/drivers/dri/i965/brw_reg.h b/src/mesa/drivers/dri/i965/brw_reg.h
index 38cf8e313714d77b3380ad9d4b4fa3bc4f05dff9..7eab7b51e380b98d7c8f2aa1195f0acc7c7a825e 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_reg.h
+++ b/src/mesa/drivers/dri/i965/brw_reg.h
@@ -88,6 +88,9 @@ struct brw_device_info;
 #define BRW_SWIZZLE_ZWZW      BRW_SWIZZLE4(2,3,2,3)
 #define BRW_SWIZZLE_WZYX      BRW_SWIZZLE4(3,2,1,0)
 
+#define BRW_SWZ_COMP_INPUT(comp) (BRW_SWIZZLE_XYZW >> ((comp)*2))
+#define BRW_SWZ_COMP_OUTPUT(comp) (BRW_SWIZZLE_XYZW << ((comp)*2))
+
 static inline bool
 brw_is_single_value_swizzle(unsigned swiz)
 {