kc3-lang/angle/src/compiler/translator/BuiltInFunctionEmulator.h

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• Author : Olli Etuaho
  Date : 2018-04-04 11:58:33
  Hash : 5fec7ab2
  Message : Identify functions by unique id in BuiltInFunctionEmulator Now that unique ids of all builtins are compile-time constants, we can use them to look up functions in BuiltInFunctionEmulator. This is simpler than using a custom struct with the name and parameters for identifying functions. This requires that we store a reference to a TFunction in those TIntermUnary nodes that were created based on a function. This decreases shader_translator binary size by about 6 KB on Windows. BUG=angleproject:2267 BUG=chromium:823856 TEST=angle_unittests Change-Id: Idd5a00c772c6f26dd36fdbbfbe161d22ab27c2fe Reviewed-on: https://chromium-review.googlesource.com/995372 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>

• src/compiler/translator/BuiltInFunctionEmulator.h

• //
  // Copyright (c) 2011 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.
  //
  
  #ifndef COMPILER_TRANSLATOR_BUILTINFUNCTIONEMULATOR_H_
  #define COMPILER_TRANSLATOR_BUILTINFUNCTIONEMULATOR_H_
  
  #include "compiler/translator/InfoSink.h"
  
  namespace sh
  {
  
  class TIntermNode;
  class TFunction;
  class TSymbolUniqueId;
  
  using BuiltinQueryFunc = const char *(int);
  
  //
  // This class decides which built-in functions need to be replaced with the emulated ones. It can be
  // used to work around driver bugs or implement functions that are not natively implemented on a
  // specific platform.
  //
  class BuiltInFunctionEmulator
  {
    public:
      BuiltInFunctionEmulator();
  
      void markBuiltInFunctionsForEmulation(TIntermNode *root);
  
      void cleanup();
  
      // "name" gets written as "name_emu".
      static void WriteEmulatedFunctionName(TInfoSinkBase &out, const char *name);
  
      bool isOutputEmpty() const;
  
      // Output function emulation definition. This should be before any other shader source.
      void outputEmulatedFunctions(TInfoSinkBase &out) const;
  
      // Add functions that need to be emulated.
      void addEmulatedFunction(const TSymbolUniqueId &uniqueId,
                               const char *emulatedFunctionDefinition);
  
      void addEmulatedFunctionWithDependency(const TSymbolUniqueId &dependency,
                                             const TSymbolUniqueId &uniqueId,
                                             const char *emulatedFunctionDefinition);
  
      void addFunctionMap(BuiltinQueryFunc queryFunc);
  
    private:
      class BuiltInFunctionEmulationMarker;
  
      // Records that a function is called by the shader and might need to be emulated. If the
      // function is not in mEmulatedFunctions, this becomes a no-op. Returns true if the function
      // call needs to be replaced with an emulated one.
      bool setFunctionCalled(const TFunction *function);
      bool setFunctionCalled(int uniqueId);
  
      const char *findEmulatedFunction(int uniqueId) const;
  
      // Map from function unique id to emulated function definition
      std::map<int, std::string> mEmulatedFunctions;
  
      // Map from dependent functions to their dependencies. This structure allows each function to
      // have at most one dependency.
      std::map<int, int> mFunctionDependencies;
  
      // Called function ids
      std::vector<int> mFunctions;
  
      // Constexpr function tables.
      std::vector<BuiltinQueryFunc *> mQueryFunctions;
  };
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_BUILTINFUNCTIONEMULATOR_H_