kc3-lang/angle/src/libANGLE/gen_packed_gl_enums.py

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• Hash : 99d492c2
  Author :
  Date : 2018-02-27T15:17:10
  

  Use packed enums for the texture types and targets, part 2
  
  This completes the refactor by using the packed enums in the gl:: layer
  and in the backends.
  
  The packed enum code generation is modified to support explicitly
  assigning values to the packed enums so that the TextureTarget cube map
  faces are in the correct order and easy to iterate over.
  
  BUG=angleproject:2169
  
  Change-Id: I5903235e684ccf382e92a8a1e10c5c85b4b16a04
  Reviewed-on: https://chromium-review.googlesource.com/939994
  Commit-Queue: Corentin Wallez <cwallez@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• src/libANGLE/gen_packed_gl_enums.py

• # Copyright 2016 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.
  #
  # gen_packed_gl_enums.py:
  #  Code generation for the packed GL enums.
  
  import datetime, json, os, sys
  from collections import namedtuple
  
  Enum = namedtuple('Enum', ['name', 'values', 'max_value'])
  EnumValue = namedtuple('EnumValue', ['name', 'gl_name', 'value'])
  
  kJsonFileName = "packed_gl_enums.json"
  
  def load_enums(path):
      with open(path) as map_file:
          enums_dict = json.loads(map_file.read())
  
      enums = []
      for (enum_name, value_list) in enums_dict.iteritems():
  
          if isinstance(value_list, dict):
              values = []
              i = 0
              for (value_name, value_gl_name) in sorted(value_list.iteritems()):
                  values.append(EnumValue(value_name, value_gl_name, i))
                  i += 1
  
              assert(i < 255) # This makes sure enums fit in the uint8_t
              enums.append(Enum(enum_name, values, i))
  
          else:
              assert(isinstance(value_list, list))
  
              values = [EnumValue(v['name'], v['gl_name'], v['value']) for v in value_list]
              max_value = max([value.value for value in values]) + 1
  
              enums.append(Enum(enum_name, values, max_value))
  
      enums.sort(key=lambda enum: enum.name)
      return enums
  
  header_template = """// GENERATED FILE - DO NOT EDIT.
  // Generated by {script_name} using data from {data_source_name}.
  //
  // Copyright {copyright_year} 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.
  //
  // PackedGLEnums_autogen.h:
  //   Declares ANGLE-specific enums classes for GLEnum and functions operating
  //   on them.
  
  #ifndef LIBANGLE_PACKEDGLENUMS_AUTOGEN_H_
  #define LIBANGLE_PACKEDGLENUMS_AUTOGEN_H_
  
  #include <angle_gl.h>
  
  #include <cstdint>
  
  namespace gl
  {{
  
  template<typename Enum>
  Enum FromGLenum(GLenum from);
  {content}
  }}  // namespace gl
  
  #endif // LIBANGLE_PACKEDGLENUMS_AUTOGEN_H_
  """
  
  enum_declaration_template = """
  enum class {enum_name} : uint8_t
  {{
  {value_declarations}
  
      InvalidEnum = {max_value},
      EnumCount = {max_value},
  }};
  
  template<>
  {enum_name} FromGLenum<{enum_name}>(GLenum from);
  GLenum ToGLenum({enum_name} from);
  """
  
  def write_header(enums, path):
      content = ['']
  
      for enum in enums:
          value_declarations = []
          for value in enum.values:
              value_declarations.append('    ' + value.name + ' = ' + str(value.value) + ',')
  
          content.append(enum_declaration_template.format(
              enum_name = enum.name,
              max_value = str(enum.max_value),
              value_declarations = '\n'.join(value_declarations)
          ))
  
      header = header_template.format(
          content = ''.join(content),
          copyright_year = datetime.date.today().year,
          data_source_name = kJsonFileName,
          script_name = sys.argv[0]
      )
  
      with (open(path, 'wt')) as f:
          f.write(header)
  
  cpp_template = """// GENERATED FILE - DO NOT EDIT.
  // Generated by {script_name} using data from {data_source_name}.
  //
  // Copyright {copyright_year} 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.
  //
  // PackedGLEnums_autogen.cpp:
  //   Implements ANGLE-specific enums classes for GLEnum and functions operating
  //   on them.
  
  #include "common/debug.h"
  #include "libANGLE/PackedGLEnums_autogen.h"
  
  namespace gl
  {{
  {content}
  }}  // namespace gl
  """
  
  enum_implementation_template = """
  template<>
  {enum_name} FromGLenum<{enum_name}>(GLenum from)
  {{
      switch(from)
      {{
  {from_glenum_cases}
          default: return {enum_name}::InvalidEnum;
      }}
  }}
  
  GLenum ToGLenum({enum_name} from)
  {{
      switch(from)
      {{
  {to_glenum_cases}
          default: UNREACHABLE(); return GL_NONE;
      }}
  }}
  """
  
  def write_cpp(enums, path):
      content = ['']
  
      for enum in enums:
          from_glenum_cases = []
          to_glenum_cases = []
          for value in enum.values:
              qualified_name = enum.name + '::' + value.name
              from_glenum_cases.append('        case ' + value.gl_name + ': return ' + qualified_name + ';')
              to_glenum_cases.append('        case ' + qualified_name + ': return ' + value.gl_name + ';')
  
          content.append(enum_implementation_template.format(
              enum_name = enum.name,
              from_glenum_cases = '\n'.join(from_glenum_cases),
              max_value = str(enum.max_value),
              to_glenum_cases = '\n'.join(to_glenum_cases)
          ))
  
      cpp = cpp_template.format(
          content = ''.join(content),
          copyright_year = datetime.date.today().year,
          data_source_name = kJsonFileName,
          script_name = sys.argv[0]
      )
  
      with (open(path, 'wt')) as f:
          f.write(cpp)
  
  if __name__ == '__main__':
      path_prefix = os.path.dirname(os.path.realpath(__file__)) + os.path.sep
      enums = load_enums(path_prefix + kJsonFileName)
  
      write_header(enums, path_prefix + 'PackedGLEnums_autogen.h')
      write_cpp(enums, path_prefix + 'PackedGLEnums_autogen.cpp')
  

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