diff options
Diffstat (limited to 'src/3rdparty/angle/src/compiler/translator/RewriteUnaryMinusOperatorFloat.cpp')
-rw-r--r-- | src/3rdparty/angle/src/compiler/translator/RewriteUnaryMinusOperatorFloat.cpp | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/src/3rdparty/angle/src/compiler/translator/RewriteUnaryMinusOperatorFloat.cpp b/src/3rdparty/angle/src/compiler/translator/RewriteUnaryMinusOperatorFloat.cpp new file mode 100644 index 0000000000..696a49536c --- /dev/null +++ b/src/3rdparty/angle/src/compiler/translator/RewriteUnaryMinusOperatorFloat.cpp @@ -0,0 +1,94 @@ +// +// Copyright (c) 2016 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/translator/RewriteUnaryMinusOperatorFloat.h" + +#include "compiler/translator/IntermNode_util.h" +#include "compiler/translator/IntermTraverse.h" + +namespace sh +{ + +namespace +{ + +class Traverser : public TIntermTraverser +{ + public: + static void Apply(TIntermNode *root); + + private: + Traverser(); + bool visitUnary(Visit visit, TIntermUnary *node) override; + void nextIteration(); + + bool mFound = false; +}; + +// static +void Traverser::Apply(TIntermNode *root) +{ + Traverser traverser; + do + { + traverser.nextIteration(); + root->traverse(&traverser); + if (traverser.mFound) + { + traverser.updateTree(); + } + } while (traverser.mFound); +} + +Traverser::Traverser() : TIntermTraverser(true, false, false) +{ +} + +void Traverser::nextIteration() +{ + mFound = false; +} + +bool Traverser::visitUnary(Visit visit, TIntermUnary *node) +{ + if (mFound) + { + return false; + } + + // Detect if the current operator is unary minus operator. + if (node->getOp() != EOpNegative) + { + return true; + } + + // Detect if the current operand is a float variable. + TIntermTyped *fValue = node->getOperand(); + if (!fValue->getType().isScalarFloat()) + { + return true; + } + + // 0.0 - float + TIntermTyped *zero = CreateZeroNode(fValue->getType()); + zero->setLine(fValue->getLine()); + TIntermBinary *sub = new TIntermBinary(EOpSub, zero, fValue); + sub->setLine(fValue->getLine()); + + queueReplacement(sub, OriginalNode::IS_DROPPED); + + mFound = true; + return false; +} + +} // anonymous namespace + +void RewriteUnaryMinusOperatorFloat(TIntermNode *root) +{ + Traverser::Apply(root); +} + +} // namespace sh |