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

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• Author : Kimmo Kinnunen
  Date : 2015-07-16 14:13:11
  Hash : b18609b9
  Message : Implement ES 2,3 parts of EXT_blend_func_extended for shader translation Exposes gl_SecondaryFragColor, glSecondaryFragData[] and gl_MaxDualSourceDrawBuffers to GLES SL 1.0. Relaxes rules for undefined output locations for GLES SL 3.0 and exposes gl_MaxDualSourceDrawBuffers. If the output GL context is GL ES 2.0 or 3.0: The emulation layer is expected to turn on EXT_blend_func_extended if the output GL context supports it. If the output GL context is GL: The emulation layer is expected to turn on EXT_blend_func_extended if the output GL context supports ARB_blend_func_extended or if GL context is 3.2 or later. If the source shader spec is GLES SL 2.0: The emulation layer is expected to inspect the shader compilation output variables upon linking. If output target is GL SL, the emulation layer should bind color location 0, index 1 to "angle_SecondaryFragColor" if variable "gl_SecondaryFragColorEXT" is used. Alternatively, emulation layer should bind "angle_SecondaryFragData" to locations 0,1,2,3,..., all color index 1, if "gl_SecondaryFragData" array is used. (The caller can not bind the locations or specify output variables.) If the source shader spec is GLES SL 3.0: The emulation layer is expected to do location auto-resolve of the the output variables that have undefined output locations that have not been bound by the caller. (The caller can not use gl_ built-ins, so nothing to do with those.) BUG=angleproject:1085 TEST=angle_unittest Change-Id: I5cafe205b0c29478b0dcd24aa89a7b0000f5d046 Reviewed-on: https://chromium-review.googlesource.com/287580 Reviewed-by: Zhenyao Mo <zmo@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Kimmo Kinnunen <kkinnunen@nvidia.com>

• src/compiler/translator/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/translator/ValidateOutputs.h"
  #include "compiler/translator/InfoSink.h"
  #include "compiler/translator/InitializeParseContext.h"
  #include "compiler/translator/ParseContext.h"
  
  namespace
  {
  void error(int *errorCount, TInfoSinkBase &sink, const TIntermSymbol &symbol, const char *reason)
  {
      sink.prefix(EPrefixError);
      sink.location(symbol.getLine());
      sink << "'" << symbol.getSymbol() << "' : " << reason << "\n";
      (*errorCount)++;
  }
  
  }  // namespace
  
  ValidateOutputs::ValidateOutputs(const TExtensionBehavior &extBehavior, int maxDrawBuffers)
      : TIntermTraverser(true, false, false),
        mMaxDrawBuffers(maxDrawBuffers),
        mAllowUnspecifiedOutputLocationResolution(
            IsExtensionEnabled(extBehavior, "GL_EXT_blend_func_extended"))
  {
  }
  
  void ValidateOutputs::visitSymbol(TIntermSymbol *symbol)
  {
      TString name = symbol->getSymbol();
      TQualifier qualifier = symbol->getQualifier();
  
      if (mVisitedSymbols.count(name) == 1)
          return;
  
      mVisitedSymbols.insert(name);
  
      if (qualifier == EvqFragmentOut)
      {
          if (symbol->getType().getLayoutQualifier().location == -1)
          {
              mUnspecifiedLocationOutputs.push_back(symbol);
          }
          else
          {
              mOutputs.push_back(symbol);
          }
      }
  }
  
  int ValidateOutputs::validateAndCountErrors(TInfoSinkBase &sink) const
  {
      OutputVector validOutputs(mMaxDrawBuffers);
      int errorCount = 0;
  
      for (const auto &symbol : mOutputs)
      {
          const TType &type         = symbol->getType();
          const size_t elementCount = static_cast<size_t>(type.isArray() ? type.getArraySize() : 1);
          const size_t location     = static_cast<size_t>(type.getLayoutQualifier().location);
  
          ASSERT(type.getLayoutQualifier().location != -1);
  
          if (location + elementCount <= validOutputs.size())
          {
              for (size_t elementIndex = 0; elementIndex < elementCount; elementIndex++)
              {
                  const size_t offsetLocation = location + elementIndex;
                  if (validOutputs[offsetLocation])
                  {
                      std::stringstream strstr;
                      strstr << "conflicting output locations with previously defined output '"
                             << validOutputs[offsetLocation]->getSymbol() << "'";
                      error(&errorCount, sink, *symbol, strstr.str().c_str());
                  }
                  else
                  {
                      validOutputs[offsetLocation] = symbol;
                  }
              }
          }
          else
          {
              if (elementCount > 0)
              {
                  error(&errorCount, sink, *symbol,
                        elementCount > 1 ? "output array locations would exceed MAX_DRAW_BUFFERS"
                                         : "output location must be < MAX_DRAW_BUFFERS");
              }
          }
      }
  
      if (!mAllowUnspecifiedOutputLocationResolution &&
          ((!mOutputs.empty() && !mUnspecifiedLocationOutputs.empty()) ||
           mUnspecifiedLocationOutputs.size() > 1))
      {
          for (const auto &symbol : mUnspecifiedLocationOutputs)
          {
              error(&errorCount, sink, *symbol,
                    "must explicitly specify all locations when using multiple fragment outputs");
          }
      }
      return errorCount;
  }