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diff --git a/ir_to_mesa.h b/ir_to_mesa.h
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+/*
+ * Copyright © 2010 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include "ir.h"
+#include "shader/prog_instruction.h"
+
+/**
+ * \file ir_to_mesa.h
+ *
+ * Translates the IR to Mesa IR if possible.
+ */
+
+/**
+ * This struct is a corresponding struct to Mesa prog_src_register, with
+ * wider fields.
+ */
+typedef struct ir_to_mesa_src_reg {
+   int file; /**< PROGRAM_* from Mesa */
+   int index; /**< temporary index, VERT_ATTRIB_*, FRAG_ATTRIB_*, etc. */
+   int swizzle; /**< SWIZZLE_XYZWONEZERO swizzles from Mesa. */
+} ir_to_mesa_src_reg;
+
+typedef struct ir_to_mesa_dst_reg {
+   int file; /**< PROGRAM_* from Mesa */
+   int index; /**< temporary index, VERT_ATTRIB_*, FRAG_ATTRIB_*, etc. */
+} ir_to_mesa_dst_reg;
+
+extern ir_to_mesa_src_reg ir_to_mesa_undef;
+
+class ir_to_mesa_instruction : public exec_node {
+public:
+   enum prog_opcode op;
+   ir_to_mesa_dst_reg dst_reg;
+   ir_to_mesa_src_reg src_reg[3];
+};
+
+struct mbtree {
+   struct mbtree *left;
+   struct mbtree *right;
+   void *state;
+   uint16_t op;
+   const char *reg_name;
+   const char *swizzle_reg_name;
+   class ir_to_mesa_visitor *v;
+
+   /**
+    * This is the representation of this tree node's results as a
+    * source register for its consumer.
+    */
+   ir_to_mesa_src_reg src_reg;
+};
+
+void do_ir_to_mesa(exec_list *instructions);
+
+class temp_entry : public exec_node {
+public:
+   temp_entry(ir_variable *var, int file, int index)
+      : file(file), index(index), var(var)
+   {
+      /* empty */
+   }
+
+   int file;
+   int index;
+   ir_variable *var; /* variable that maps to this, if any */
+};
+
+class ir_to_mesa_visitor : public ir_visitor {
+public:
+   ir_to_mesa_visitor()
+   {
+      result = NULL;
+      next_temp = 0;
+      next_constant = 0;
+   }
+
+   int next_temp;
+   int next_constant;
+
+   void get_temp(struct mbtree *tree);
+
+   void get_temp_for_var(ir_variable *var, struct mbtree *tree);
+
+   struct mbtree *create_tree(int op,
+			      struct mbtree *left,
+			      struct mbtree *right);
+
+   /**
+    * \name Visit methods
+    *
+    * As typical for the visitor pattern, there must be one \c visit method for
+    * each concrete subclass of \c ir_instruction.  Virtual base classes within
+    * the hierarchy should not have \c visit methods.
+    */
+   /*@{*/
+   virtual void visit(ir_variable *);
+   virtual void visit(ir_loop *);
+   virtual void visit(ir_loop_jump *);
+   virtual void visit(ir_function_signature *);
+   virtual void visit(ir_function *);
+   virtual void visit(ir_expression *);
+   virtual void visit(ir_swizzle *);
+   virtual void visit(ir_dereference_variable *);
+   virtual void visit(ir_dereference_array *);
+   virtual void visit(ir_dereference_record *);
+   virtual void visit(ir_assignment *);
+   virtual void visit(ir_constant *);
+   virtual void visit(ir_call *);
+   virtual void visit(ir_return *);
+   virtual void visit(ir_texture *);
+   virtual void visit(ir_if *);
+   /*@}*/
+
+   struct mbtree *result;
+
+   /** List of temp_entry */
+   exec_list variable_storage;
+
+   /** List of ir_to_mesa_instruction */
+   exec_list instructions;
+};
+
+ir_to_mesa_instruction *
+ir_to_mesa_emit_op1(struct mbtree *tree, enum prog_opcode op,
+		    ir_to_mesa_dst_reg dst,
+		    ir_to_mesa_src_reg src0);
+
+ir_to_mesa_instruction *
+ir_to_mesa_emit_op2(struct mbtree *tree, enum prog_opcode op,
+		    ir_to_mesa_dst_reg dst,
+		    ir_to_mesa_src_reg src0,
+		    ir_to_mesa_src_reg src1);
+
+ir_to_mesa_instruction *
+ir_to_mesa_emit_op3(struct mbtree *tree, enum prog_opcode op,
+		    ir_to_mesa_dst_reg dst,
+		    ir_to_mesa_src_reg src0,
+		    ir_to_mesa_src_reg src1,
+		    ir_to_mesa_src_reg src2);
+
+inline ir_to_mesa_dst_reg
+ir_to_mesa_dst_reg_from_src(ir_to_mesa_src_reg reg)
+{
+   ir_to_mesa_dst_reg dst_reg;
+
+   dst_reg.file = reg.file;
+   dst_reg.index = reg.index;
+
+   return dst_reg;
+}