kc3-lang/angle/src/openGL32/entry_points_utils.h

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• Hash : 7558e836
  Author :
  Date : 2019-06-18T13:02:03
  

  Windows Desktop GL Implementation
  
  Bug: angleproject:3620
  Change-Id: I4ef4ab3ee145e5ce9b1ebf0c2d61d0777db72c43
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1678405
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

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• src/openGL32/entry_points_utils.h

• //
  // Copyright 2018 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.
  //
  // entry_point_utils:
  //   These helpers are used in GL entry point routines.
  
  #ifndef OPENGL32_ENTRY_POINT_UTILS_H_
  #define OPENGL32_ENTRY_POINT_UTILS_H_
  
  #include "angle_gl.h"
  #include "common/Optional.h"
  #include "common/PackedEnums.h"
  #include "common/angleutils.h"
  #include "common/mathutil.h"
  #include "openGL32/entry_points_enum_autogen.h"
  
  namespace gl
  {
  // A template struct for determining the default value to return for each entry point.
  template <EntryPoint EP, typename ReturnType>
  struct DefaultReturnValue;
  
  // Default return values for each basic return type.
  template <EntryPoint EP>
  struct DefaultReturnValue<EP, GLint>
  {
      static constexpr GLint kValue = -1;
  };
  
  // This doubles as the GLenum return value.
  template <EntryPoint EP>
  struct DefaultReturnValue<EP, GLuint>
  {
      static constexpr GLuint kValue = 0;
  };
  
  template <EntryPoint EP>
  struct DefaultReturnValue<EP, GLboolean>
  {
      static constexpr GLboolean kValue = GL_FALSE;
  };
  
  // Catch-all rules for pointer types.
  template <EntryPoint EP, typename PointerType>
  struct DefaultReturnValue<EP, const PointerType *>
  {
      static constexpr const PointerType *kValue = nullptr;
  };
  
  template <EntryPoint EP, typename PointerType>
  struct DefaultReturnValue<EP, PointerType *>
  {
      static constexpr PointerType *kValue = nullptr;
  };
  
  // Overloaded to return invalid index
  template <>
  struct DefaultReturnValue<EntryPoint::GetUniformBlockIndex, GLuint>
  {
      static constexpr GLuint kValue = GL_INVALID_INDEX;
  };
  
  template <EntryPoint EP, typename ReturnType>
  constexpr ANGLE_INLINE ReturnType GetDefaultReturnValue()
  {
      return DefaultReturnValue<EP, ReturnType>::kValue;
  }
  }  // namespace gl
  
  #endif  // OPENGL32_ENTRY_POINT_UTILS_H_
  

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