From 548a1b5ab7304037a7cac8e6d647fb6b5ccbaf5d Mon Sep 17 00:00:00 2001
From: Ian Romanick <ian.d.romanick@intel.com>
Date: Tue, 30 Mar 2010 16:58:19 -0700
Subject: [PATCH] Implement array type handling

Since all glsl_type objects are flyweights, support is added to track all
known array types.  This accounts for most of the changes.
---
 glsl_types.cpp | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 glsl_types.h   | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 81 insertions(+)

diff --git a/glsl_types.cpp b/glsl_types.cpp
index df9667f..8d11196 100644
--- a/glsl_types.cpp
+++ b/glsl_types.cpp
@@ -26,8 +26,11 @@
 #include "glsl_parser_extras.h"
 #include "glsl_types.h"
 #include "builtin_types.h"
+#include "hash_table.h"
 
 
+hash_table *glsl_type::array_types = NULL;
+
 static void
 add_types_to_symbol_table(glsl_symbol_table *symtab,
 			  const struct glsl_type *types,
@@ -542,3 +545,49 @@ glsl_type::get_instance(unsigned base_type, unsigned rows, unsigned columns)
    assert(!"Should not get here.");
    return error_type;
 }
+
+
+int
+glsl_type::array_key_compare(const void *a, const void *b)
+{
+   const array_hash_key *const key1 = (array_hash_key *) a;
+   const array_hash_key *const key2 = (array_hash_key *) b;
+
+   return ((key1->type == key2->type) && (key1->size == key2->size)) ? 0 : 1;
+}
+
+
+unsigned
+glsl_type::array_key_hash(const void *a)
+{
+   char buf[sizeof(array_hash_key) + 1];
+
+   memcpy(buf, a, sizeof(array_hash_key));
+   buf[sizeof(array_hash_key)] = '\0';
+
+   return hash_table_string_hash(buf);
+}
+
+
+const glsl_type *
+glsl_type::get_array_instance(const glsl_type *base, unsigned array_size)
+{
+   array_hash_key key = { base, array_size };
+
+   if (array_types == NULL) {
+      array_types = hash_table_ctor(64, array_key_hash, array_key_compare);
+   }
+
+   const glsl_type *t = (glsl_type *) hash_table_find(array_types, & key);
+   if (t == NULL) {
+      t = new glsl_type(base, array_size);
+
+      hash_table_insert(array_types, (void *) t, & key);
+   }
+
+   assert(t->base_type == GLSL_TYPE_ARRAY);
+   assert(t->length == array_size);
+   assert(t->fields.array == base);
+
+   return t;
+}
diff --git a/glsl_types.h b/glsl_types.h
index bb2d6f6..6f3b512 100644
--- a/glsl_types.h
+++ b/glsl_types.h
@@ -170,6 +170,12 @@ struct glsl_type {
 					unsigned columns);
 
    /**
+    * Get the instance of an array type
+    */
+   static const glsl_type *get_array_instance(const glsl_type *base,
+					      unsigned elements);
+
+   /**
     * Query the total number of scalars that make up a scalar, vector or matrix
     */
    unsigned components() const
@@ -301,6 +307,20 @@ struct glsl_type {
 
 private:
    /**
+    * Constructor for array types
+    */
+   glsl_type(const glsl_type *array, unsigned length) :
+      base_type(GLSL_TYPE_ARRAY),
+      sampler_dimensionality(0), sampler_shadow(0), sampler_array(0),
+      sampler_type(0),
+      vector_elements(0), matrix_columns(0),
+      name(NULL), length(length)
+   {
+      this->fields.array = array;
+      this->name = "<array>";
+   }
+
+   /**
     * \name Pointers to various private type singletons
     */
    /*@{*/
@@ -314,6 +334,18 @@ private:
    static const glsl_type *const mat4x3_type;
    static const glsl_type *const mat4_type;
    /*@}*/
+
+   /** Hash table containing the known array types. */
+   static struct hash_table *array_types;
+
+   /** Structure defining the key type used for array_types hash table. */
+   struct array_hash_key {
+      const glsl_type *type;
+      unsigned size;
+   };
+
+   static int array_key_compare(const void *a, const void *b);
+   static unsigned array_key_hash(const void *key);
 };
 
 struct glsl_struct_field {
-- 
2.7.4