1 files changed, 61 insertions, 0 deletions
diff --git a/src/3rdparty/angle/src/compiler/InitializeGLPosition.cpp b/src/3rdparty/angle/src/compiler/InitializeGLPosition.cpp
new file mode 100644
index 0000000000..e0193e39d2
--- /dev/null
+++ b/src/3rdparty/angle/src/compiler/InitializeGLPosition.cpp
@@ -0,0 +1,61 @@
+//
+// Copyright (c) 2002-2013 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+#include "compiler/InitializeGLPosition.h"
+#include "compiler/debug.h"
+
+bool InitializeGLPosition::visitAggregate(Visit visit, TIntermAggregate* node)
+{
+    bool visitChildren = !mCodeInserted;
+    switch (node->getOp())
+    {
+      case EOpSequence: break;
+      case EOpFunction:
+      {
+        // Function definition.
+        ASSERT(visit == PreVisit);
+        if (node->getName() == "main(")
+        {
+            TIntermSequence &sequence = node->getSequence();
+            ASSERT((sequence.size() == 1) || (sequence.size() == 2));
+            TIntermAggregate *body = NULL;
+            if (sequence.size() == 1)
+            {
+                body = new TIntermAggregate(EOpSequence);
+                sequence.push_back(body);
+            }
+            else
+            {
+                body = sequence[1]->getAsAggregate();
+            }
+            ASSERT(body);
+            insertCode(body->getSequence());
+            mCodeInserted = true;
+        }
+        break;
+      }
+      default: visitChildren = false; break;
+    }
+    return visitChildren;
+}
+
+void InitializeGLPosition::insertCode(TIntermSequence& sequence)
+{
+    TIntermBinary *binary = new TIntermBinary(EOpAssign);
+    sequence.insert(sequence.begin(), binary);
+
+    TIntermSymbol *left = new TIntermSymbol(
+        0, "gl_Position", TType(EbtFloat, EbpUndefined, EvqPosition, 4));
+    binary->setLeft(left);
+
+    ConstantUnion *u = new ConstantUnion[4];
+    for (int ii = 0; ii < 3; ++ii)
+        u[ii].setFConst(0.0f);
+    u[3].setFConst(1.0f);
+    TIntermConstantUnion *right = new TIntermConstantUnion(
+        u, TType(EbtFloat, EbpUndefined, EvqConst, 4));
+    binary->setRight(right);
+}