ARB prog parser: use _mesa_add_unnamed_constant() to use fewer constant slots

This function will search the constant parameters in an effort to re-use
constant slots.  For example, {1,2,3,4} and {4,1,1,2} can be stored in
one constant slot and accessed with different swizzles.  The swizzle info
must be propogated though the parsing code in a few places.

Fixes Piglit "vpfp-generic tests/shaders/generic/big-param.vpfp" failure.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mesa/shader/program_parser.h b/src/mesa/shader/program_parser.h
index c170948f73..69396ca2c0 100644
--- a/src/mesa/shader/program_parser.h
+++ b/src/mesa/shader/program_parser.h
@@ -56,6 +56,12 @@ struct asm_symbol {
     */
    unsigned param_binding_begin;
 
+   /**
+    * Constants put into the parameter list may be swizzled.  This
+    * field contain's the symbol's swizzle. (SWIZZLE_X/Y/Z/W)
+    */
+   unsigned param_binding_swizzle;
+
    /* This is how many entries in the the program_parameter_list we take up
     * with our state tokens or constants. Note that this is _not_ the same as
     * the number of param registers we eventually use.