Mesa (gallium-0.1): ureg: add explicit undefined src/dest constructors

[Keith Whitwell]

Module: Mesa
Branch: gallium-0.1
Commit: 2fc182e7f0753cad77888069578cd723a541ac5f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=2fc182e7f0753cad77888069578cd723a541ac5f

Author: Keith Whitwell <keithw at vmware.com>
Date:   Thu Aug 27 15:35:53 2009 +0100

ureg: add explicit undefined src/dest constructors

Also functions to test for undefined registers.

---

 src/gallium/auxiliary/tgsi/tgsi_ureg.h |   50 ++++++++++++++++++++++++++++++++
 1 files changed, 50 insertions(+), 0 deletions(-)

diff --git a/src/gallium/auxiliary/tgsi/tgsi_ureg.h b/src/gallium/auxiliary/tgsi/tgsi_ureg.h
index 50e98ba..2cebbeb 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_ureg.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_ureg.h
@@ -483,6 +483,56 @@ ureg_src( struct ureg_dst dst )
    return src;
 }
 
+
+
+static INLINE struct ureg_dst
+ureg_dst_undef( void )
+{
+   struct ureg_dst dst;
+
+   dst.File      = TGSI_FILE_NULL;
+   dst.WriteMask = 0;
+   dst.Indirect  = 0;
+   dst.Saturate  = 0;
+   dst.Index     = 0;
+   dst.Pad1      = 0;
+   dst.Pad2      = 0;
+
+   return dst;
+}
+
+static INLINE struct ureg_src
+ureg_src_undef( void )
+{
+   struct ureg_src src;
+
+   src.File      = TGSI_FILE_NULL;
+   src.SwizzleX  = 0;
+   src.SwizzleY  = 0;
+   src.SwizzleZ  = 0;
+   src.SwizzleW  = 0;
+   src.Pad       = 0;
+   src.Indirect  = 0;
+   src.Absolute  = 0;
+   src.Index     = 0;
+   src.Negate    = 0;
+   
+   return src;
+}
+
+static INLINE boolean
+ureg_src_is_undef( struct ureg_src src )
+{
+   return src.File == TGSI_FILE_NULL;
+}
+
+static INLINE boolean
+ureg_dst_is_undef( struct ureg_dst dst )
+{
+   return dst.File == TGSI_FILE_NULL;
+}
+
+
 #ifdef __cplusplus
 }
 #endif