ir_to_mesa: Start building GLSL IR to Mesa IR conversion.

There are major missing pieces here.  Most operations aren't
supported.  Matrices need to be broken down to vector ops before we
get here.  Scalar operations (RSQ, RCP) are handled incorrectly.
Arrays and structures are not even considered.

1 files changed, 170 insertions, 0 deletions

diff --git a/ir_to_mesa.h b/ir_to_mesa.h
new file mode 100644
index 00000000000..6154c1ca583
--- /dev/null
+++ b/ir_to_mesa.h
@@ -0,0 +1,170 @@
+/*
+ * 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;
+}