[Mesa-dev] [PATCH 05/14] glsl: Add IR builder support for function calls.

[Francisco Jerez]

---
 src/glsl/ir_builder.cpp | 25 +++++++++++++++++++++++++
 src/glsl/ir_builder.h   |  8 ++++++++
 2 files changed, 33 insertions(+)

diff --git a/src/glsl/ir_builder.cpp b/src/glsl/ir_builder.cpp
index 98b4322..1913c72 100644
--- a/src/glsl/ir_builder.cpp
+++ b/src/glsl/ir_builder.cpp
@@ -21,6 +21,7 @@
  * IN THE SOFTWARE.
  */
 
+#include <stdarg.h>
 #include "ir_builder.h"
 #include "program/prog_instruction.h"
 
@@ -535,4 +536,28 @@ if_tree(operand condition,
    return result;
 }
 
+ir_call *
+call(ir_function *f, ir_variable *ret, int num_params, ...)
+{
+   void *ctx = ralloc_parent(f);
+   exec_list actual_parameters;
+   va_list ap;
+
+   va_start(ap, num_params);
+   for (int i = 0; i < num_params; ++i)
+      actual_parameters.push_tail(va_arg(ap, operand).val);
+   va_end(ap);
+
+   ir_function_signature *sig =
+      f->exact_matching_signature(NULL, &actual_parameters);
+   if (!sig)
+      return NULL;
+
+   ir_dereference_variable *deref =
+      (sig->return_type->is_void() ? NULL :
+       new(ctx) ir_dereference_variable(ret));
+
+   return new(ctx) ir_call(sig, deref, &actual_parameters);
+}
+
 } /* namespace ir_builder */
diff --git a/src/glsl/ir_builder.h b/src/glsl/ir_builder.h
index 6a5f771..80b4b2c 100644
--- a/src/glsl/ir_builder.h
+++ b/src/glsl/ir_builder.h
@@ -210,4 +210,12 @@ ir_if *if_tree(operand condition,
                ir_instruction *then_branch,
                ir_instruction *else_branch);
 
+/**
+ * Call function \param f with \param num_params parameters which are
+ * passed as a variable number of \c operand type arguments.  \param
+ * ret should point to the ir_variable that will hold the function
+ * return value, or be \c NULL if the function has void return type.
+ */
+ir_call *call(ir_function *f, ir_variable *ret, int num_params, ...);
+
 } /* namespace ir_builder */
-- 
1.8.3.4