2 files changed, 42 insertions, 0 deletions
diff --git a/src/glsl/ir_builder.cpp b/src/glsl/ir_builder.cpp
index 98ac3c100a1..0c8a15bc86e 100644
--- a/src/glsl/ir_builder.cpp
+++ b/src/glsl/ir_builder.cpp
@@ -34,6 +34,24 @@ ir_factory::emit(ir_instruction *ir)
    instructions->push_tail(ir);
 }
 
+ir_assignment *
+assign(deref lhs, operand rhs, int writemask)
+{
+   void *mem_ctx = ralloc_parent(lhs.val);
+
+   ir_assignment *assign = new(mem_ctx) ir_assignment(lhs.val,
+						      rhs.val,
+						      NULL, writemask);
+
+   return assign;
+}
+
+ir_assignment *
+assign(deref lhs, operand rhs)
+{
+   return assign(lhs, rhs, (1 << lhs.val->type->vector_elements) - 1);
+}
+
 ir_swizzle *
 swizzle(operand a, int swizzle, int components)
 {
diff --git a/src/glsl/ir_builder.h b/src/glsl/ir_builder.h
index 350f9a33a81..af9d1600f68 100644
--- a/src/glsl/ir_builder.h
+++ b/src/glsl/ir_builder.h
@@ -50,6 +50,27 @@ public:
    ir_rvalue *val;
 };
 
+/** Automatic generator for ir_dereference_variable on assignment LHS.
+ *
+ * \sa operand
+ */
+class deref {
+public:
+   deref(ir_dereference *val)
+      : val(val)
+   {
+   }
+
+   deref(ir_variable *var)
+   {
+      void *mem_ctx = ralloc_parent(var);
+      val = new(mem_ctx) ir_dereference_variable(var);
+   }
+
+
+   ir_dereference *val;
+};
+
 class ir_factory {
 public:
    void emit(ir_instruction *ir);
@@ -58,6 +79,9 @@ public:
    void *mem_ctx;
 };
 
+ir_assignment *assign(deref lhs, operand rhs);
+ir_assignment *assign(deref lhs, operand rhs, int writemask);
+
 ir_expression *expr(ir_expression_operation op, operand a, operand b);
 ir_expression *add(operand a, operand b);
 ir_expression *sub(operand a, operand b);