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

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• Author : Jamie Madill
  Date : 2013-06-20 11:55:49
  Hash : 05a80ceb
  Message : Validate fragment shader outputs and produce a compile error on missing or conflicting assignments. TRAC #22704 Signed-off-by: Geoff Lang Signed-off-by: Nicolas Capens Authored-by: Jamie Madill

• src/compiler/ValidateOutputs.cpp

• //
  // Copyright (c) 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/ValidateOutputs.h"
  #include "compiler/InfoSink.h"
  #include "compiler/InitializeParseContext.h"
  #include "compiler/ParseHelper.h"
  
  ValidateOutputs::ValidateOutputs(TInfoSinkBase& sink, int maxDrawBuffers)
      : mSink(sink),
        mMaxDrawBuffers(maxDrawBuffers),
        mNumErrors(0),
        mHasUnspecifiedOutputLocation(false)
  {
  }
  
  void ValidateOutputs::visitSymbol(TIntermSymbol *symbol)
  {
      TString name = symbol->getSymbol();
      TQualifier qualifier = symbol->getQualifier();
  
      if (mVisitedSymbols.count(name) == 1)
          return;
  
      mVisitedSymbols.insert(name);
  
      if (qualifier == EvqFragmentOutput)
      {
          const TType &type = symbol->getType();
          const int location = type.getLayoutQualifier().location;
  
          if (mHasUnspecifiedOutputLocation)
          {
              error(symbol->getLine(), "must explicitly specify all locations when using multiple fragment outputs", name.c_str());
          }
          else if (location == -1)
          {
              mHasUnspecifiedOutputLocation = true;
          }
          else
          {
              OutputMap::iterator mapEntry = mOutputMap.find(location);
              if (mapEntry == mOutputMap.end())
              {
                  const int elementCount = type.isArray() ? type.getArraySize() : 1;
                  if (location + elementCount > mMaxDrawBuffers)
                  {
                      error(symbol->getLine(), "output location must be < MAX_DRAW_BUFFERS", name.c_str());
                  }
  
                  for (int elementIndex = 0; elementIndex < elementCount; elementIndex++)
                  {
                      const int offsetLocation = location + elementIndex;
                      mOutputMap[offsetLocation] = symbol;
                  }
              }
              else
              {
                  std::stringstream strstr;
                  strstr << "conflicting output locations with previously defined output '"
                         << mapEntry->second->getSymbol() << "'";
  
                  error(symbol->getLine(), strstr.str().c_str(), name.c_str());
              }
          }
      }
  }
  
  void ValidateOutputs::error(TSourceLoc loc, const char *reason, const char* token)
  {
      mSink.prefix(EPrefixError);
      mSink.location(loc);
      mSink << "'" << token << "' : " << reason << "\n";
      mNumErrors++;
  }