Mesa (glsl2): ir_to_mesa: Add support for dFdx, dFdy.

[Eric Anholt]

Module: Mesa
Branch: glsl2
Commit: ba9bd708cb3480817e18cc47e57d83a4e4c305bb
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=ba9bd708cb3480817e18cc47e57d83a4e4c305bb

Author: Eric Anholt <eric at anholt.net>
Date:   Tue Jun 29 16:36:42 2010 -0700

ir_to_mesa: Add support for dFdx, dFdy.

---

 src/mesa/shader/ir_to_mesa.cpp |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/src/mesa/shader/ir_to_mesa.cpp b/src/mesa/shader/ir_to_mesa.cpp
index f045181..152cb1d 100644
--- a/src/mesa/shader/ir_to_mesa.cpp
+++ b/src/mesa/shader/ir_to_mesa.cpp
@@ -628,6 +628,14 @@ ir_to_mesa_visitor::visit(ir_expression *ir)
    case ir_unop_cos:
       ir_to_mesa_emit_scalar_op1(ir, OPCODE_COS, result_dst, op[0]);
       break;
+
+   case ir_unop_dFdx:
+      ir_to_mesa_emit_op1(ir, OPCODE_DDX, result_dst, op[0]);
+      break;
+   case ir_unop_dFdy:
+      ir_to_mesa_emit_op1(ir, OPCODE_DDY, result_dst, op[0]);
+      break;
+
    case ir_binop_add:
       ir_to_mesa_emit_op2(ir, OPCODE_ADD, result_dst, op[0], op[1]);
       break;