1 files changed, 47 insertions, 0 deletions
diff --git a/src/3rdparty/angle/src/compiler/translator/ClampPointSize.cpp b/src/3rdparty/angle/src/compiler/translator/ClampPointSize.cpp
new file mode 100644
index 0000000000..8598a137f5
--- /dev/null
+++ b/src/3rdparty/angle/src/compiler/translator/ClampPointSize.cpp
@@ -0,0 +1,47 @@
+//
+// Copyright (c) 2017 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.
+//
+// ClampPointSize.cpp: Limit the value that is written to gl_PointSize.
+//
+
+#include "compiler/translator/ClampPointSize.h"
+
+#include "compiler/translator/FindSymbolNode.h"
+#include "compiler/translator/IntermNode_util.h"
+#include "compiler/translator/RunAtTheEndOfShader.h"
+#include "compiler/translator/SymbolTable.h"
+
+namespace sh
+{
+
+void ClampPointSize(TIntermBlock *root, float maxPointSize, TSymbolTable *symbolTable)
+{
+    // Only clamp gl_PointSize if it's used in the shader.
+    if (!FindSymbolNode(root, TString("gl_PointSize"), EbtFloat))
+    {
+        return;
+    }
+
+    TIntermSymbol *pointSizeNode = ReferenceBuiltInVariable("gl_PointSize", *symbolTable, 100);
+
+    TConstantUnion *maxPointSizeConstant = new TConstantUnion();
+    maxPointSizeConstant->setFConst(maxPointSize);
+    TIntermConstantUnion *maxPointSizeNode =
+        new TIntermConstantUnion(maxPointSizeConstant, TType(EbtFloat, EbpHigh, EvqConst));
+
+    // min(gl_PointSize, maxPointSize)
+    TIntermSequence *minArguments = new TIntermSequence();
+    minArguments->push_back(pointSizeNode->deepCopy());
+    minArguments->push_back(maxPointSizeNode);
+    TIntermTyped *clampedPointSize =
+        CreateBuiltInFunctionCallNode("min", minArguments, *symbolTable, 100);
+
+    // gl_PointSize = min(gl_PointSize, maxPointSize)
+    TIntermBinary *assignPointSize = new TIntermBinary(EOpAssign, pointSizeNode, clampedPointSize);
+
+    RunAtTheEndOfShader(root, assignPointSize, symbolTable);
+}
+
+}  // namespace sh