kc3-lang/angle/src/libANGLE/Error.h

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• Author : Jamie Madill
  Date : 2016-03-29 17:00:48
  Hash : da123308
  Message : Add ANGLE_TRY macros to reduce boilerplate with gl/egl Errors. The macros don't need to disambiguate between GL/EGL. Also make helpers to deal with ErrorOrResult. BUG=angleproject:1310 BUG=angleproject:1327 Change-Id: I8041c4b17a859fe1f236bca3ad266453d67a8fd4 Reviewed-on: https://chromium-review.googlesource.com/335826 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>

• src/libANGLE/Error.h

• //
  // Copyright (c) 2014 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.
  
  // Error.h: Defines the egl::Error and gl::Error classes which encapsulate API errors
  // and optional error messages.
  
  #ifndef LIBANGLE_ERROR_H_
  #define LIBANGLE_ERROR_H_
  
  #include "angle_gl.h"
  #include <EGL/egl.h>
  
  #include <string>
  #include <memory>
  
  namespace gl
  {
  
  class Error final
  {
    public:
      explicit inline Error(GLenum errorCode);
      Error(GLenum errorCode, const char *msg, ...);
      Error(GLenum errorCode, GLuint id, const char *msg, ...);
      inline Error(const Error &other);
      inline Error(Error &&other);
  
      inline Error &operator=(const Error &other);
      inline Error &operator=(Error &&other);
  
      inline GLenum getCode() const;
      inline GLuint getID() const;
      inline bool isError() const;
  
      const std::string &getMessage() const;
  
      // Useful for mocking and testing
      bool operator==(const Error &other) const;
      bool operator!=(const Error &other) const;
  
    private:
      void createMessageString() const;
  
      GLenum mCode;
      GLuint mID;
      mutable std::unique_ptr<std::string> mMessage;
  };
  
  template <typename T>
  class ErrorOrResult
  {
    public:
      ErrorOrResult(const gl::Error &error) : mError(error) {}
      ErrorOrResult(gl::Error &&error) : mError(std::move(error)) {}
  
      ErrorOrResult(T &&result)
          : mError(GL_NO_ERROR), mResult(std::forward<T>(result))
      {
      }
  
      ErrorOrResult(const T &result)
          : mError(GL_NO_ERROR), mResult(result)
      {
      }
  
      bool isError() const { return mError.isError(); }
      const gl::Error &getError() const { return mError; }
      T &&getResult() { return std::move(mResult); }
  
    private:
      Error mError;
      T mResult;
  };
  
  inline Error NoError()
  {
      return Error(GL_NO_ERROR);
  }
  
  }  // namespace gl
  
  namespace egl
  {
  
  class Error final
  {
    public:
      explicit inline Error(EGLint errorCode);
      Error(EGLint errorCode, const char *msg, ...);
      Error(EGLint errorCode, EGLint id, const char *msg, ...);
      inline Error(const Error &other);
      inline Error(Error &&other);
  
      inline Error &operator=(const Error &other);
      inline Error &operator=(Error &&other);
  
      inline EGLint getCode() const;
      inline EGLint getID() const;
      inline bool isError() const;
  
      const std::string &getMessage() const;
  
    private:
      void createMessageString() const;
  
      EGLint mCode;
      EGLint mID;
      mutable std::unique_ptr<std::string> mMessage;
  };
  
  }  // namespace egl
  
  #define ANGLE_CONCAT1(x, y) x##y
  #define ANGLE_CONCAT2(x, y) ANGLE_CONCAT1(x, y)
  #define ANGLE_LOCAL_VAR ANGLE_CONCAT2(_localVar, __LINE__)
  
  #define ANGLE_TRY(EXPR)                \
      {                                  \
          auto ANGLE_LOCAL_VAR = EXPR;   \
          if (ANGLE_LOCAL_VAR.isError()) \
          {                              \
              return ANGLE_LOCAL_VAR;    \
          }                              \
      }                                  \
      ANGLE_EMPTY_STATEMENT
  
  #define ANGLE_TRY_RESULT(EXPR, RESULT)         \
      {                                          \
          auto ANGLE_LOCAL_VAR = EXPR;           \
          if (ANGLE_LOCAL_VAR.isError())         \
          {                                      \
              return ANGLE_LOCAL_VAR.getError(); \
          }                                      \
          RESULT = ANGLE_LOCAL_VAR.getResult();  \
      }                                          \
      ANGLE_EMPTY_STATEMENT
  
  #undef ANGLE_LOCAL_VAR
  #undef ANGLE_CONCAT2
  #undef ANGLE_CONCAT1
  
  #include "Error.inl"
  
  #endif // LIBANGLE_ERROR_H_