kc3-lang/angle/src/compiler/UnfoldSelect.cpp

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• Author : daniel@transgaming.com
  Date : 2011-10-04 18:43:40
  Hash : ccb38417
  Message : Support multiple nested ternary operators per statement TRAC #18382 ANGLEBUG=203,208 Signed-off-by: Daniel Koch Author: Nicolas Capens - by incrementing the temporary index, adding 1 for every nesting level, and rewinding it after each traverse. Also fixed multiple ternary operator unfolding for loops. git-svn-id: https://angleproject.googlecode.com/svn/trunk@784 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/compiler/UnfoldSelect.cpp

• //
  // Copyright (c) 2002-2010 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.
  //
  // UnfoldSelect is an AST traverser to output the select operator ?: as if-else statements
  //
  
  #include "compiler/UnfoldSelect.h"
  
  #include "compiler/InfoSink.h"
  #include "compiler/OutputHLSL.h"
  
  namespace sh
  {
  UnfoldSelect::UnfoldSelect(TParseContext &context, OutputHLSL *outputHLSL) : mContext(context), mOutputHLSL(outputHLSL)
  {
      mTemporaryIndex = 0;
  }
  
  void UnfoldSelect::traverse(TIntermNode *node)
  {
      int rewindIndex = mTemporaryIndex;
      node->traverse(this);
      mTemporaryIndex = rewindIndex;
  }
  
  bool UnfoldSelect::visitSelection(Visit visit, TIntermSelection *node)
  {
      TInfoSinkBase &out = mOutputHLSL->getBodyStream();
  
      if (node->usesTernaryOperator())
      {
          int i = mTemporaryIndex;
  
          out << mOutputHLSL->typeString(node->getType()) << " s" << i << ";\n";
  
          mTemporaryIndex = i + 1;
          node->getCondition()->traverse(this);
          out << "if(";
          mTemporaryIndex = i + 1;
          node->getCondition()->traverse(mOutputHLSL);
          out << ")\n"
                 "{\n";
          mTemporaryIndex = i + 1;
          node->getTrueBlock()->traverse(this);
          out << "    s" << i << " = ";
          mTemporaryIndex = i + 1;
          node->getTrueBlock()->traverse(mOutputHLSL);
          out << ";\n"
                 "}\n"
                 "else\n"
                 "{\n";
          mTemporaryIndex = i + 1;
          node->getFalseBlock()->traverse(this);
          out << "    s" << i << " = ";
          mTemporaryIndex = i + 1;
          node->getFalseBlock()->traverse(mOutputHLSL);
          out << ";\n"
                 "}\n";
  
          mTemporaryIndex = i + 1;
      }
  
      return false;
  }
  
  bool UnfoldSelect::visitLoop(Visit visit, TIntermLoop *node)
  {
      int rewindIndex = mTemporaryIndex;
  
      if (node->getInit())
      {
          node->getInit()->traverse(this);
      }
      
      if (node->getCondition())
      {
          node->getCondition()->traverse(this);
      }
  
      if (node->getExpression())
      {
          node->getExpression()->traverse(this);
      }
  
      mTemporaryIndex = rewindIndex;
  
      return false;
  }
  
  int UnfoldSelect::getNextTemporaryIndex()
  {
      return mTemporaryIndex++;
  }
  }