kc3-lang/angle/src/libANGLE/renderer/gl/formatutilsgl.cpp

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• Hash : acf2f3ad
  Author :
  Date : 2017-11-21T19:22:44
  

  Apply Chromium style fixes.
  
  This addresses several minor code quality issues that are validated
  in Chromium, but not yet applied to ANGLE:
  
  * constructors and destructors must be defined out-of-line
  * auto is not allowed for simple pointer types
  * use override everywhere instead of virtual
  * virtual functions must also be defined out-of-line
  
  Slightly reduces binary size for me (~2k on Win, 150k on Linux).
  
  Bug: angleproject:1569
  Change-Id: I073ca3365188caf5f29fb28d9eb207903c1843e6
  Reviewed-on: https://chromium-review.googlesource.com/779959
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/libANGLE/renderer/gl/formatutilsgl.cpp

• //
  // Copyright (c) 2015 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.
  //
  
  // formatutilsgl.cpp: Queries for GL image formats and their translations to native
  // GL formats.
  
  #include "libANGLE/renderer/gl/formatutilsgl.h"
  
  #include <limits>
  
  #include "common/string_utils.h"
  #include "libANGLE/formatutils.h"
  
  namespace rx
  {
  
  namespace nativegl
  {
  
  SupportRequirement::SupportRequirement()
      : version(std::numeric_limits<GLuint>::max(), std::numeric_limits<GLuint>::max()),
        versionExtensions(),
        requiredExtensions()
  {
  }
  
  SupportRequirement::SupportRequirement(const SupportRequirement &other) = default;
  
  SupportRequirement::~SupportRequirement()
  {
  }
  
  InternalFormat::InternalFormat()
      : texture(),
        filter(),
        renderbuffer(),
        framebufferAttachment()
  {
  }
  
  InternalFormat::InternalFormat(const InternalFormat &other) = default;
  
  InternalFormat::~InternalFormat()
  {
  }
  
  // supported = version || vertexExt
  static inline SupportRequirement VersionOrExts(GLuint major, GLuint minor, const std::string &versionExt)
  {
      SupportRequirement requirement;
      requirement.version.major = major;
      requirement.version.minor = minor;
      angle::SplitStringAlongWhitespace(versionExt, &requirement.versionExtensions);
      return requirement;
  }
  
  // supported = (version || vertexExt) && requiredExt
  static inline SupportRequirement VersionOrExtsAndExts(GLuint major,
                                                        GLuint minor,
                                                        const std::string &versionExt,
                                                        const std::string &requiredExt)
  {
      SupportRequirement requirement;
      requirement.version.major = major;
      requirement.version.minor = minor;
      angle::SplitStringAlongWhitespace(versionExt, &requirement.versionExtensions);
      angle::SplitStringAlongWhitespace(requiredExt, &requirement.requiredExtensions);
      return requirement;
  }
  
  // supported = version
  static inline SupportRequirement VersionOnly(GLuint major, GLuint minor)
  {
      SupportRequirement requirement;
      requirement.version.major = major;
      requirement.version.minor = minor;
      return requirement;
  }
  
  // supported = ext
  static inline SupportRequirement ExtsOnly(const std::string &ext)
  {
      SupportRequirement requirement;
      requirement.version.major = 0;
      requirement.version.minor = 0;
      angle::SplitStringAlongWhitespace(ext, &requirement.requiredExtensions);
      return requirement;
  }
  
  // supported = true
  static inline SupportRequirement AlwaysSupported()
  {
      SupportRequirement requirement;
      requirement.version.major = 0;
      requirement.version.minor = 0;
      return requirement;
  }
  
  // supported = false
  static inline SupportRequirement NeverSupported()
  {
      SupportRequirement requirement;
      requirement.version.major = std::numeric_limits<GLuint>::max();
      requirement.version.minor = std::numeric_limits<GLuint>::max();
      return requirement;
  }
  
  struct InternalFormatInfo
  {
      InternalFormat glesInfo;
      InternalFormat glInfo;
  };
  
  typedef std::pair<GLenum, InternalFormatInfo> InternalFormatInfoPair;
  typedef std::map<GLenum, InternalFormatInfo> InternalFormatInfoMap;
  
  // A helper function to insert data into the format map with fewer characters.
  static inline void InsertFormatMapping(InternalFormatInfoMap *map, GLenum internalFormat,
                                         const SupportRequirement &desktopTexture, const SupportRequirement &desktopFilter, const SupportRequirement &desktopRender,
                                         const SupportRequirement &esTexture, const SupportRequirement &esFilter, const SupportRequirement &esRender)
  {
      InternalFormatInfo formatInfo;
      formatInfo.glInfo.texture = desktopTexture;
      formatInfo.glInfo.filter = desktopFilter;
      formatInfo.glInfo.renderbuffer = desktopRender;
      formatInfo.glInfo.framebufferAttachment = desktopRender;
      formatInfo.glesInfo.texture = esTexture;
      formatInfo.glesInfo.filter = esTexture;
      formatInfo.glesInfo.renderbuffer = esFilter;
      formatInfo.glesInfo.framebufferAttachment = esRender;
      map->insert(std::make_pair(internalFormat, formatInfo));
  }
  
  static InternalFormatInfoMap BuildInternalFormatInfoMap()
  {
      InternalFormatInfoMap map;
  
      // clang-format off
      //                       | Format              | OpenGL texture support                          | Filter           | OpenGL render support                        | OpenGL ES texture support                 | Filter           | OpenGL ES render support                 |
      InsertFormatMapping(&map, GL_R8,                VersionOrExts(3, 0, "GL_ARB_texture_rg"),         AlwaysSupported(), VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOrExts(3, 0, "GL_EXT_texture_rg"),   AlwaysSupported(), VersionOrExts(3, 0, "GL_EXT_texture_rg")  );
      InsertFormatMapping(&map, GL_R8_SNORM,          VersionOnly(3, 1),                                AlwaysSupported(), NeverSupported(),                              VersionOnly(3, 0),                          AlwaysSupported(), NeverSupported()                          );
      InsertFormatMapping(&map, GL_RG8,               VersionOrExts(3, 0, "GL_ARB_texture_rg"),         AlwaysSupported(), VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOrExts(3, 0, "GL_EXT_texture_rg"),   AlwaysSupported(), VersionOrExts(3, 0, "GL_ARB_texture_rg")  );
      InsertFormatMapping(&map, GL_RG8_SNORM,         VersionOnly(3, 1),                                AlwaysSupported(), NeverSupported(),                              VersionOnly(3, 0),                          AlwaysSupported(), NeverSupported()                          );
      InsertFormatMapping(&map, GL_RGB8,              AlwaysSupported(),                                AlwaysSupported(), AlwaysSupported(),                             VersionOrExts(3, 0, "GL_OES_rgb8_rgba8"),   AlwaysSupported(), AlwaysSupported()                         );
      InsertFormatMapping(&map, GL_RGB8_SNORM,        VersionOnly(3, 1),                                AlwaysSupported(), NeverSupported(),                              VersionOnly(3, 0),                          AlwaysSupported(), NeverSupported()                          );
      InsertFormatMapping(&map, GL_RGB565,            AlwaysSupported(),                                AlwaysSupported(), AlwaysSupported(),                             AlwaysSupported(),                          AlwaysSupported(), AlwaysSupported()                         );
      InsertFormatMapping(&map, GL_RGBA4,             AlwaysSupported(),                                AlwaysSupported(), AlwaysSupported(),                             AlwaysSupported(),                          AlwaysSupported(), AlwaysSupported()                         );
      InsertFormatMapping(&map, GL_RGB5_A1,           AlwaysSupported(),                                AlwaysSupported(), AlwaysSupported(),                             AlwaysSupported(),                          AlwaysSupported(), AlwaysSupported()                         );
      InsertFormatMapping(&map, GL_RGBA8,             AlwaysSupported(),                                AlwaysSupported(), AlwaysSupported(),                             VersionOrExts(3, 0, "GL_OES_rgb8_rgba8"),   AlwaysSupported(), VersionOrExts(3, 0, "GL_OES_rgb8_rgba8")  );
      InsertFormatMapping(&map, GL_RGBA8_SNORM,       VersionOnly(3, 1),                                AlwaysSupported(), NeverSupported(),                              VersionOnly(3, 0),                          AlwaysSupported(), NeverSupported()                          );
      InsertFormatMapping(&map, GL_RGB10_A2,          AlwaysSupported(),                                AlwaysSupported(), AlwaysSupported(),                             VersionOnly(3, 0),                          AlwaysSupported(), VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_RGB10_A2UI,        VersionOrExts(3, 3, "GL_ARB_texture_rgb10_a2ui"), NeverSupported(),  AlwaysSupported(),                             VersionOnly(3, 0),                          NeverSupported(),  AlwaysSupported()                         );
      InsertFormatMapping(&map, GL_SRGB8,             VersionOrExts(2, 1, "GL_EXT_texture_sRGB"),       AlwaysSupported(), VersionOrExts(2, 1, "GL_EXT_texture_sRGB"),    VersionOnly(3, 0),                          AlwaysSupported(), NeverSupported()                          );
      InsertFormatMapping(&map, GL_SRGB8_ALPHA8,      VersionOrExts(2, 1, "GL_EXT_texture_sRGB"),       AlwaysSupported(), VersionOrExts(2, 1, "GL_EXT_texture_sRGB"),    VersionOnly(3, 0),                          AlwaysSupported(), VersionOrExts(3, 0, "GL_EXT_sRGB")        );
      InsertFormatMapping(&map, GL_R8I,               VersionOrExts(3, 0, "GL_ARB_texture_rg"),         NeverSupported(),  VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_R8UI,              VersionOrExts(3, 0, "GL_ARB_texture_rg"),         NeverSupported(),  VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_R16I,              VersionOrExts(3, 0, "GL_ARB_texture_rg"),         NeverSupported(),  VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_R16UI,             VersionOrExts(3, 0, "GL_ARB_texture_rg"),         NeverSupported(),  VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_R32I,              VersionOrExts(3, 0, "GL_ARB_texture_rg"),         NeverSupported(),  VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_R32UI,             VersionOrExts(3, 0, "GL_ARB_texture_rg"),         NeverSupported(),  VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_RG8I,              VersionOrExts(3, 0, "GL_ARB_texture_rg"),         NeverSupported(),  VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_RG8UI,             VersionOrExts(3, 0, "GL_ARB_texture_rg"),         NeverSupported(),  VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_RG16I,             VersionOrExts(3, 0, "GL_ARB_texture_rg"),         NeverSupported(),  VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_RG16UI,            VersionOrExts(3, 0, "GL_ARB_texture_rg"),         NeverSupported(),  VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_RG32I,             VersionOrExts(3, 0, "GL_ARB_texture_rg"),         NeverSupported(),  VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_RG32UI,            VersionOrExts(3, 0, "GL_ARB_texture_rg"),         NeverSupported(),  VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_RGB8I,             VersionOrExts(3, 0, "GL_EXT_texture_integer"),    NeverSupported(),  NeverSupported(),                              VersionOnly(3, 0),                          NeverSupported(),  NeverSupported()                          );
      InsertFormatMapping(&map, GL_RGB8UI,            VersionOrExts(3, 0, "GL_EXT_texture_integer"),    NeverSupported(),  NeverSupported(),                              VersionOnly(3, 0),                          NeverSupported(),  NeverSupported()                          );
      InsertFormatMapping(&map, GL_RGB16I,            VersionOrExts(3, 0, "GL_EXT_texture_integer"),    NeverSupported(),  NeverSupported(),                              VersionOnly(3, 0),                          NeverSupported(),  NeverSupported()                          );
      InsertFormatMapping(&map, GL_RGB16UI,           VersionOrExts(3, 0, "GL_EXT_texture_integer"),    NeverSupported(),  NeverSupported(),                              VersionOnly(3, 0),                          NeverSupported(),  NeverSupported()                          );
      InsertFormatMapping(&map, GL_RGB32I,            VersionOrExts(3, 0, "GL_EXT_texture_integer"),    NeverSupported(),  NeverSupported(),                              VersionOnly(3, 0),                          NeverSupported(),  NeverSupported()                          );
      InsertFormatMapping(&map, GL_RGB32UI,           VersionOrExts(3, 0, "GL_EXT_texture_integer"),    NeverSupported(),  NeverSupported(),                              VersionOnly(3, 0),                          NeverSupported(),  NeverSupported()                          );
      InsertFormatMapping(&map, GL_RGBA8I,            VersionOrExts(3, 0, "GL_EXT_texture_integer"),    NeverSupported(),  VersionOrExts(3, 0, "GL_EXT_texture_integer"), VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_RGBA8UI,           VersionOrExts(3, 0, "GL_EXT_texture_integer"),    NeverSupported(),  VersionOrExts(3, 0, "GL_EXT_texture_integer"), VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_RGBA16I,           VersionOrExts(3, 0, "GL_EXT_texture_integer"),    NeverSupported(),  VersionOrExts(3, 0, "GL_EXT_texture_integer"), VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_RGBA16UI,          VersionOrExts(3, 0, "GL_EXT_texture_integer"),    NeverSupported(),  VersionOrExts(3, 0, "GL_EXT_texture_integer"), VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_RGBA32I,           VersionOrExts(3, 0, "GL_EXT_texture_integer"),    NeverSupported(),  VersionOrExts(3, 0, "GL_EXT_texture_integer"), VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_RGBA32UI,          VersionOrExts(3, 0, "GL_EXT_texture_integer"),    NeverSupported(),  VersionOrExts(3, 0, "GL_EXT_texture_integer"), VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
  
      // Unsized formats
      InsertFormatMapping(&map, GL_ALPHA,             NeverSupported(),                                 NeverSupported(),  NeverSupported(),                              NeverSupported(),                           NeverSupported(),  NeverSupported()                          );
      InsertFormatMapping(&map, GL_LUMINANCE,         NeverSupported(),                                 NeverSupported(),  NeverSupported(),                              NeverSupported(),                           NeverSupported(),  NeverSupported()                          );
      InsertFormatMapping(&map, GL_LUMINANCE_ALPHA,   NeverSupported(),                                 NeverSupported(),  NeverSupported(),                              NeverSupported(),                           NeverSupported(),  NeverSupported()                          );
      InsertFormatMapping(&map, GL_RED,               VersionOrExts(3, 0, "GL_ARB_texture_rg"),         AlwaysSupported(), VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOrExts(3, 0, "GL_EXT_texture_rg"),   AlwaysSupported(), VersionOrExts(3, 0, "GL_ARB_texture_rg")  );
      InsertFormatMapping(&map, GL_RG,                VersionOrExts(3, 0, "GL_ARB_texture_rg"),         AlwaysSupported(), VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOrExts(3, 0, "GL_EXT_texture_rg"),   AlwaysSupported(), VersionOrExts(3, 0, "GL_ARB_texture_rg")  );
      InsertFormatMapping(&map, GL_RGB,               AlwaysSupported(),                                AlwaysSupported(), AlwaysSupported(),                             AlwaysSupported(),                          AlwaysSupported(), AlwaysSupported()                         );
      InsertFormatMapping(&map, GL_RGBA,              AlwaysSupported(),                                AlwaysSupported(), AlwaysSupported(),                             AlwaysSupported(),                          AlwaysSupported(), AlwaysSupported()                         );
      InsertFormatMapping(&map, GL_RED_INTEGER,       VersionOrExts(3, 0, "GL_ARB_texture_rg"),         NeverSupported(),  VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_RG_INTEGER,        VersionOrExts(3, 0, "GL_ARB_texture_rg"),         NeverSupported(),  VersionOrExts(3, 0, "GL_ARB_texture_rg"),      VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_RGB_INTEGER,       VersionOrExts(3, 0, "GL_EXT_texture_integer"),    NeverSupported(),  NeverSupported(),                              VersionOnly(3, 0),                          NeverSupported(),  NeverSupported()                          );
      InsertFormatMapping(&map, GL_RGBA_INTEGER,      VersionOrExts(3, 0, "GL_EXT_texture_integer"),    NeverSupported(),  VersionOrExts(3, 0, "GL_EXT_texture_integer"), VersionOnly(3, 0),                          NeverSupported(),  VersionOnly(3, 0)                         );
      InsertFormatMapping(&map, GL_SRGB,              VersionOrExts(2, 1, "GL_EXT_texture_sRGB"),       AlwaysSupported(), VersionOrExts(2, 1, "GL_EXT_texture_sRGB"),    ExtsOnly("GL_EXT_sRGB"),                    AlwaysSupported(), NeverSupported()                          );
      InsertFormatMapping(&map, GL_SRGB_ALPHA,        VersionOrExts(2, 1, "GL_EXT_texture_sRGB"),       AlwaysSupported(), VersionOrExts(2, 1, "GL_EXT_texture_sRGB"),    ExtsOnly("GL_EXT_sRGB"),                    AlwaysSupported(), NeverSupported()                          );
  
      // From GL_EXT_texture_format_BGRA8888
      InsertFormatMapping(&map, GL_BGRA8_EXT,         VersionOrExts(1, 2, "GL_EXT_bgra"),               AlwaysSupported(), VersionOrExts(1, 2, "GL_EXT_bgra"),            ExtsOnly("GL_EXT_texture_format_BGRA8888"), AlwaysSupported(), NeverSupported()                          );
      InsertFormatMapping(&map, GL_BGRA_EXT,          VersionOrExts(1, 2, "GL_EXT_bgra"),               AlwaysSupported(), VersionOrExts(1, 2, "GL_EXT_bgra"),            ExtsOnly("GL_EXT_texture_format_BGRA8888"), AlwaysSupported(), NeverSupported()                          );
  
      // Floating point formats
      // Note that GL_EXT_texture_shared_exponent and GL_ARB_color_buffer_float suggest that RGB9_E5
      // would be renderable, but once support for renderable float textures got rolled into core GL
      // spec it wasn't intended to be renderable. In practice it's not reliably renderable even
      // with the extensions, there's a known bug in at least NVIDIA driver version 370.
      //                       | Format              | OpenGL texture support                                       | Filter           | OpenGL render support                                                                  | OpenGL ES texture support                                         | Filter                                                 | OpenGL ES render support                                                        |
      InsertFormatMapping(&map, GL_R11F_G11F_B10F,    VersionOrExts(3, 0, "GL_EXT_packed_float"),                    AlwaysSupported(), VersionOrExts(3, 0, "GL_EXT_packed_float GL_ARB_color_buffer_float"),                    VersionOnly(3, 0),                                                  AlwaysSupported(),                                       ExtsOnly("GL_EXT_color_buffer_float")                                            );
      InsertFormatMapping(&map, GL_RGB9_E5,           VersionOrExts(3, 0, "GL_EXT_texture_shared_exponent"),         AlwaysSupported(), NeverSupported(),                                                                        VersionOnly(3, 0),                                                  AlwaysSupported(),                                       NeverSupported()                                                                 );
      InsertFormatMapping(&map, GL_R16F,              VersionOrExts(3, 0, "GL_ARB_texture_rg ARB_texture_float"),    AlwaysSupported(), VersionOrExts(3, 0, "GL_ARB_texture_rg GL_ARB_texture_float GL_ARB_color_buffer_float"), VersionOrExts(3, 0, "GL_OES_texture_half_float GL_EXT_texture_rg"), VersionOrExts(3, 0, "GL_OES_texture_half_float_linear"), VersionOrExtsAndExts(3, 0, "GL_EXT_texture_rg", "GL_EXT_color_buffer_half_float"));
      InsertFormatMapping(&map, GL_RG16F,             VersionOrExts(3, 0, "GL_ARB_texture_rg ARB_texture_float"),    AlwaysSupported(), VersionOrExts(3, 0, "GL_ARB_texture_rg GL_ARB_texture_float GL_ARB_color_buffer_float"), VersionOrExts(3, 0, "GL_OES_texture_half_float GL_EXT_texture_rg"), VersionOrExts(3, 0, "GL_OES_texture_half_float_linear"), VersionOrExtsAndExts(3, 0, "GL_EXT_texture_rg", "GL_EXT_color_buffer_half_float"));
      InsertFormatMapping(&map, GL_RGB16F,            VersionOrExts(3, 0, "GL_ARB_texture_float"),                   AlwaysSupported(), VersionOrExts(3, 0, "GL_ARB_texture_float GL_ARB_color_buffer_float"),                   VersionOrExts(3, 0, "GL_OES_texture_half_float"),                   VersionOrExts(3, 0, "GL_OES_texture_half_float_linear"), ExtsOnly("GL_EXT_color_buffer_half_float")                                       );
      InsertFormatMapping(&map, GL_RGBA16F,           VersionOrExts(3, 0, "GL_ARB_texture_float"),                   AlwaysSupported(), VersionOrExts(3, 0, "GL_ARB_texture_float GL_ARB_color_buffer_float"),                   VersionOrExts(3, 0, "GL_OES_texture_half_float"),                   VersionOrExts(3, 0, "GL_OES_texture_half_float_linear"), ExtsOnly("GL_EXT_color_buffer_half_float")                                       );
      InsertFormatMapping(&map, GL_R32F,              VersionOrExts(3, 0, "GL_ARB_texture_rg GL_ARB_texture_float"), AlwaysSupported(), VersionOrExts(3, 0, "GL_ARB_texture_rg GL_ARB_texture_float GL_ARB_color_buffer_float"), VersionOrExts(3, 0, "GL_OES_texture_float GL_EXT_texture_rg"),      ExtsOnly("GL_OES_texture_float_linear"),                 ExtsOnly("GL_EXT_color_buffer_float")                                            );
      InsertFormatMapping(&map, GL_RG32F,             VersionOrExts(3, 0, "GL_ARB_texture_rg GL_ARB_texture_float"), AlwaysSupported(), VersionOrExts(3, 0, "GL_ARB_texture_rg GL_ARB_texture_float GL_ARB_color_buffer_float"), VersionOrExts(3, 0, "GL_OES_texture_float GL_EXT_texture_rg"),      ExtsOnly("GL_OES_texture_float_linear"),                 ExtsOnly("GL_EXT_color_buffer_float")                                            );
      InsertFormatMapping(&map, GL_RGB32F,            VersionOrExts(3, 0, "GL_ARB_texture_float"),                   AlwaysSupported(), VersionOrExts(3, 0, "GL_ARB_texture_float GL_ARB_color_buffer_float"),                   VersionOrExts(3, 0, "GL_OES_texture_float"),                        ExtsOnly("GL_OES_texture_float_linear"),                 NeverSupported()                                                                 );
      InsertFormatMapping(&map, GL_RGBA32F,           VersionOrExts(3, 0, "GL_ARB_texture_float"),                   AlwaysSupported(), VersionOrExts(3, 0, "GL_ARB_texture_float GL_ARB_color_buffer_float"),                   VersionOrExts(3, 0, "GL_OES_texture_float"),                        ExtsOnly("GL_OES_texture_float_linear"),                 ExtsOnly("GL_EXT_color_buffer_float")                                            );
  
      // Depth stencil formats
      //                       | Format                  | OpenGL texture support                            | Filter                                     | OpenGL render support                             | OpenGL ES texture support                  | Filter                                     | OpenGL ES render support                                              |
      InsertFormatMapping(&map, GL_DEPTH_COMPONENT16,     VersionOnly(1, 5),                                  VersionOrExts(1, 5, "GL_ARB_depth_texture"), VersionOnly(1, 5),                                  VersionOnly(2, 0),                           VersionOrExts(3, 0, "GL_OES_depth_texture"), VersionOnly(2, 0)                                                      );
      InsertFormatMapping(&map, GL_DEPTH_COMPONENT24,     VersionOnly(1, 5),                                  VersionOrExts(1, 5, "GL_ARB_depth_texture"), VersionOnly(1, 5),                                  VersionOnly(2, 0),                           VersionOrExts(3, 0, "GL_OES_depth_texture"), VersionOnly(2, 0)                                                      );
      InsertFormatMapping(&map, GL_DEPTH_COMPONENT32_OES, VersionOnly(1, 5),                                  VersionOrExts(1, 5, "GL_ARB_depth_texture"), VersionOnly(1, 5),                                  ExtsOnly("GL_OES_depth_texture"),            AlwaysSupported(),                           ExtsOnly("GL_OES_depth32")                                             );
      InsertFormatMapping(&map, GL_DEPTH_COMPONENT32F,    VersionOrExts(3, 0, "GL_ARB_depth_buffer_float"),   AlwaysSupported(),                           VersionOrExts(3, 0, "GL_ARB_depth_buffer_float"),   VersionOnly(3, 0),                           VersionOrExts(3, 0, "GL_OES_depth_texture"), VersionOnly(3, 0)                                                      );
      InsertFormatMapping(&map, GL_STENCIL_INDEX8,        VersionOrExts(3, 0, "GL_EXT_packed_depth_stencil"), NeverSupported(),                            VersionOrExts(3, 0, "GL_EXT_packed_depth_stencil"), VersionOnly(2, 0),                           NeverSupported(),                            VersionOnly(2, 0)                                                      );
      InsertFormatMapping(&map, GL_DEPTH24_STENCIL8,      VersionOrExts(3, 0, "GL_ARB_framebuffer_object"),   VersionOrExts(3, 0, "GL_ARB_depth_texture"), VersionOrExts(3, 0, "GL_ARB_framebuffer_object"),   VersionOrExts(3, 0, "GL_OES_depth_texture"), AlwaysSupported(),                           VersionOrExts(3, 0, "GL_OES_depth_texture GL_OES_packed_depth_stencil"));
      InsertFormatMapping(&map, GL_DEPTH32F_STENCIL8,     VersionOrExts(3, 0, "GL_ARB_depth_buffer_float"),   AlwaysSupported(),                           VersionOrExts(3, 0, "GL_ARB_depth_buffer_float"),   VersionOnly(3, 0),                           AlwaysSupported(),                           VersionOnly(3, 0)                                                      );
      InsertFormatMapping(&map, GL_DEPTH_COMPONENT,       VersionOnly(1, 5),                                  VersionOrExts(1, 5, "GL_ARB_depth_texture"), VersionOnly(1, 5),                                  VersionOnly(2, 0),                           VersionOrExts(3, 0, "GL_OES_depth_texture"), VersionOnly(2, 0)                                                      );
      InsertFormatMapping(&map, GL_DEPTH_STENCIL,         VersionOnly(1, 5),                                  VersionOrExts(1, 5, "GL_ARB_depth_texture"), VersionOnly(1, 5),                                  VersionOnly(2, 0),                           VersionOrExts(3, 0, "GL_OES_depth_texture"), VersionOnly(2, 0)                                                      );
  
      // Luminance alpha formats
      //                       | Format                  | OpenGL texture support                      | Filter           | Render          | OpenGL ES texture support                                | Filter                                                 | Render          |
      InsertFormatMapping(&map, GL_ALPHA8_EXT,             AlwaysSupported(),                           AlwaysSupported(), NeverSupported(), ExtsOnly("GL_EXT_texture_storage"),                        AlwaysSupported(),                                       NeverSupported());
      InsertFormatMapping(&map, GL_LUMINANCE8_EXT,         AlwaysSupported(),                           AlwaysSupported(), NeverSupported(), ExtsOnly("GL_EXT_texture_storage"),                        AlwaysSupported(),                                       NeverSupported());
      InsertFormatMapping(&map, GL_LUMINANCE8_ALPHA8_EXT,  AlwaysSupported(),                           AlwaysSupported(), NeverSupported(), ExtsOnly("GL_EXT_texture_storage"),                        AlwaysSupported(),                                       NeverSupported());
      InsertFormatMapping(&map, GL_ALPHA16F_EXT,           VersionOrExts(3, 0, "GL_ARB_texture_float"), AlwaysSupported(), NeverSupported(), ExtsOnly("GL_EXT_texture_storage OES_texture_half_float"), VersionOrExts(3, 0, "GL_OES_texture_half_float_linear"), NeverSupported());
      InsertFormatMapping(&map, GL_LUMINANCE16F_EXT,       VersionOrExts(3, 0, "GL_ARB_texture_float"), AlwaysSupported(), NeverSupported(), ExtsOnly("GL_EXT_texture_storage OES_texture_half_float"), VersionOrExts(3, 0, "GL_OES_texture_half_float_linear"), NeverSupported());
      InsertFormatMapping(&map, GL_LUMINANCE_ALPHA16F_EXT, VersionOrExts(3, 0, "GL_ARB_texture_float"), AlwaysSupported(), NeverSupported(), ExtsOnly("GL_EXT_texture_storage OES_texture_half_float"), VersionOrExts(3, 0, "GL_OES_texture_half_float_linear"), NeverSupported());
      InsertFormatMapping(&map, GL_ALPHA32F_EXT,           VersionOrExts(3, 0, "GL_ARB_texture_float"), AlwaysSupported(), NeverSupported(), ExtsOnly("GL_EXT_texture_storage OES_texture_float"),      ExtsOnly("GL_OES_texture_float_linear"),                 NeverSupported());
      InsertFormatMapping(&map, GL_LUMINANCE32F_EXT,       VersionOrExts(3, 0, "GL_ARB_texture_float"), AlwaysSupported(), NeverSupported(), ExtsOnly("GL_EXT_texture_storage OES_texture_float"),      ExtsOnly("GL_OES_texture_float_linear"),                 NeverSupported());
      InsertFormatMapping(&map, GL_LUMINANCE_ALPHA32F_EXT, VersionOrExts(3, 0, "GL_ARB_texture_float"), AlwaysSupported(), NeverSupported(), ExtsOnly("GL_EXT_texture_storage OES_texture_float"),      ExtsOnly("GL_OES_texture_float_linear"),                 NeverSupported());
  
      // Compressed formats, From ES 3.0.1 spec, table 3.16
      InsertFormatMapping(&map, GL_COMPRESSED_R11_EAC,                        VersionOrExts(4, 3, "GL_ARB_ES3_compatibility"), AlwaysSupported(), NeverSupported(), VersionOnly(3, 0), AlwaysSupported(), NeverSupported());
      InsertFormatMapping(&map, GL_COMPRESSED_SIGNED_R11_EAC,                 VersionOrExts(4, 3, "GL_ARB_ES3_compatibility"), AlwaysSupported(), NeverSupported(), VersionOnly(3, 0), AlwaysSupported(), NeverSupported());
      InsertFormatMapping(&map, GL_COMPRESSED_RG11_EAC,                       VersionOrExts(4, 3, "GL_ARB_ES3_compatibility"), AlwaysSupported(), NeverSupported(), VersionOnly(3, 0), AlwaysSupported(), NeverSupported());
      InsertFormatMapping(&map, GL_COMPRESSED_SIGNED_RG11_EAC,                VersionOrExts(4, 3, "GL_ARB_ES3_compatibility"), AlwaysSupported(), NeverSupported(), VersionOnly(3, 0), AlwaysSupported(), NeverSupported());
      InsertFormatMapping(&map, GL_COMPRESSED_RGB8_ETC2,                      VersionOrExts(4, 3, "GL_ARB_ES3_compatibility"), AlwaysSupported(), NeverSupported(), VersionOnly(3, 0), AlwaysSupported(), NeverSupported());
      InsertFormatMapping(&map, GL_COMPRESSED_SRGB8_ETC2,                     VersionOrExts(4, 3, "GL_ARB_ES3_compatibility"), AlwaysSupported(), NeverSupported(), VersionOnly(3, 0), AlwaysSupported(), NeverSupported());
      InsertFormatMapping(&map, GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2,  VersionOrExts(4, 3, "GL_ARB_ES3_compatibility"), AlwaysSupported(), NeverSupported(), VersionOnly(3, 0), AlwaysSupported(), NeverSupported());
      InsertFormatMapping(&map, GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2, VersionOrExts(4, 3, "GL_ARB_ES3_compatibility"), AlwaysSupported(), NeverSupported(), VersionOnly(3, 0), AlwaysSupported(), NeverSupported());
      InsertFormatMapping(&map, GL_COMPRESSED_RGBA8_ETC2_EAC,                 VersionOrExts(4, 3, "GL_ARB_ES3_compatibility"), AlwaysSupported(), NeverSupported(), VersionOnly(3, 0), AlwaysSupported(), NeverSupported());
      InsertFormatMapping(&map, GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC,          VersionOrExts(4, 3, "GL_ARB_ES3_compatibility"), AlwaysSupported(), NeverSupported(), VersionOnly(3, 0), AlwaysSupported(), NeverSupported());
  
      // From GL_EXT_texture_compression_dxt1
      //                       | Format                            | OpenGL texture support                         | Filter           | Render          | OpenGL ES texture support                    | Filter           | Render           |
      InsertFormatMapping(&map, GL_COMPRESSED_RGB_S3TC_DXT1_EXT,    ExtsOnly("GL_EXT_texture_compression_s3tc"),     AlwaysSupported(), NeverSupported(), ExtsOnly("GL_EXT_texture_compression_dxt1"),   AlwaysSupported(), NeverSupported());
      InsertFormatMapping(&map, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT,   ExtsOnly("GL_EXT_texture_compression_s3tc"),     AlwaysSupported(), NeverSupported(), ExtsOnly("GL_EXT_texture_compression_dxt1"),   AlwaysSupported(), NeverSupported());
  
      // From GL_ANGLE_texture_compression_dxt3
      InsertFormatMapping(&map, GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE, ExtsOnly("GL_EXT_texture_compression_s3tc"),     AlwaysSupported(), NeverSupported(), ExtsOnly("GL_ANGLE_texture_compression_dxt3"), AlwaysSupported(), NeverSupported());
  
      // From GL_ANGLE_texture_compression_dxt5
      InsertFormatMapping(&map, GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE, ExtsOnly("GL_EXT_texture_compression_s3tc"),     AlwaysSupported(), NeverSupported(), ExtsOnly("GL_ANGLE_texture_compression_dxt5"), AlwaysSupported(), NeverSupported());
  
      // From GL_ETC1_RGB8_OES
      InsertFormatMapping(&map, GL_ETC1_RGB8_OES,                   VersionOrExts(4, 3, "GL_ARB_ES3_compatibility"), AlwaysSupported(), NeverSupported(), VersionOrExts(3, 0, "GL_ETC1_RGB8_OES"),       AlwaysSupported(), NeverSupported());
  
      // clang-format on
  
      return map;
  }
  
  static const InternalFormatInfoMap &GetInternalFormatMap()
  {
      static const InternalFormatInfoMap formatMap = BuildInternalFormatInfoMap();
      return formatMap;
  }
  
  const InternalFormat &GetInternalFormatInfo(GLenum internalFormat, StandardGL standard)
  {
      const InternalFormatInfoMap &formatMap = GetInternalFormatMap();
      InternalFormatInfoMap::const_iterator iter = formatMap.find(internalFormat);
      if (iter != formatMap.end())
      {
          const InternalFormatInfo &info = iter->second;
          switch (standard)
          {
            case STANDARD_GL_ES:      return info.glesInfo;
            case STANDARD_GL_DESKTOP: return info.glInfo;
            default: UNREACHABLE();   break;
          }
      }
  
      static const InternalFormat defaultInternalFormat;
      return defaultInternalFormat;
  }
  
  static GLenum GetNativeInternalFormat(const FunctionsGL *functions,
                                        const WorkaroundsGL &workarounds,
                                        const gl::InternalFormat &internalFormat)
  {
      GLenum result = internalFormat.internalFormat;
  
      if (functions->standard == STANDARD_GL_DESKTOP)
      {
          // Use sized internal formats whenever possible to guarantee the requested precision.
          // On Desktop GL, passing an internal format of GL_RGBA will generate a GL_RGBA8 texture
          // even if the provided type is GL_FLOAT.
          result = internalFormat.sizedInternalFormat;
  
          if (workarounds.avoid1BitAlphaTextureFormats && internalFormat.alphaBits == 1)
          {
              // Use an 8-bit format instead
              result = GL_RGBA8;
          }
  
          if (workarounds.rgba4IsNotSupportedForColorRendering &&
              internalFormat.sizedInternalFormat == GL_RGBA4)
          {
              // Use an 8-bit format instead
              result = GL_RGBA8;
          }
  
          if (internalFormat.sizedInternalFormat == GL_RGB565 &&
              !functions->isAtLeastGL(gl::Version(4, 1)) &&
              !functions->hasGLExtension("GL_ARB_ES2_compatibility"))
          {
              // GL_RGB565 is required for basic ES2 functionality but was not added to desktop GL
              // until 4.1.
              // Work around this by using an 8-bit format instead.
              result = GL_RGB8;
          }
  
          if (internalFormat.sizedInternalFormat == GL_BGRA8_EXT)
          {
              // GLES accepts GL_BGRA as an internal format but desktop GL only accepts it as a type.
              // Update the internal format to GL_RGBA.
              result = GL_RGBA8;
          }
  
          if ((functions->profile & GL_CONTEXT_CORE_PROFILE_BIT) != 0)
          {
              // Work around deprecated luminance alpha formats in the OpenGL core profile by backing
              // them with R or RG textures.
              if (internalFormat.format == GL_LUMINANCE || internalFormat.format == GL_ALPHA)
              {
                  result = gl::GetInternalFormatInfo(GL_RED, internalFormat.type).sizedInternalFormat;
              }
  
              if (internalFormat.format == GL_LUMINANCE_ALPHA)
              {
                  result = gl::GetInternalFormatInfo(GL_RG, internalFormat.type).sizedInternalFormat;
              }
          }
      }
      else if (functions->isAtLeastGLES(gl::Version(3, 0)))
      {
          if (internalFormat.componentType == GL_FLOAT && !internalFormat.isLUMA())
          {
              // Use sized internal formats for floating point textures.  Extensions such as
              // EXT_color_buffer_float require the sized formats to be renderable.
              result = internalFormat.sizedInternalFormat;
          }
      }
  
      return result;
  }
  
  static GLenum GetNativeFormat(const FunctionsGL *functions,
                                const WorkaroundsGL &workarounds,
                                GLenum format)
  {
      GLenum result = format;
  
      if (functions->standard == STANDARD_GL_DESKTOP)
      {
          // The ES SRGB extensions require that the provided format is GL_SRGB or SRGB_ALPHA but
          // the desktop GL extensions only accept GL_RGB or GL_RGBA.  Convert them.
          if (format == GL_SRGB)
          {
              result = GL_RGB;
          }
  
          if (format == GL_SRGB_ALPHA)
          {
              result = GL_RGBA;
          }
  
          if ((functions->profile & GL_CONTEXT_CORE_PROFILE_BIT) != 0)
          {
              // Work around deprecated luminance alpha formats in the OpenGL core profile by backing
              // them with R or RG textures.
              if (format == GL_LUMINANCE || format == GL_ALPHA)
              {
                  result = GL_RED;
              }
  
              if (format == GL_LUMINANCE_ALPHA)
              {
                  result = GL_RG;
              }
          }
      }
  
      return result;
  }
  
  static GLenum GetNativeCompressedFormat(const FunctionsGL *functions,
                                          const WorkaroundsGL &workarounds,
                                          GLenum format)
  {
      GLenum result = format;
  
      if (functions->standard == STANDARD_GL_DESKTOP)
      {
          if (format == GL_ETC1_RGB8_OES)
          {
              // GL_ETC1_RGB8_OES is not available in any desktop GL extension but the compression
              // format is forwards compatible so just use the ETC2 format.
              result = GL_COMPRESSED_RGB8_ETC2;
          }
      }
  
      if (functions->isAtLeastGLES(gl::Version(3, 0)))
      {
          if (format == GL_ETC1_RGB8_OES)
          {
              // Pass GL_COMPRESSED_RGB8_ETC2 as the target format in ES3 and higher because it
              // becomes a core format.
              result = GL_COMPRESSED_RGB8_ETC2;
          }
      }
  
      return result;
  }
  
  static GLenum GetNativeType(const FunctionsGL *functions,
                              const WorkaroundsGL &workarounds,
                              GLenum format,
                              GLenum type)
  {
      GLenum result = type;
  
      if (functions->standard == STANDARD_GL_DESKTOP)
      {
          if (type == GL_HALF_FLOAT_OES)
          {
              // The enums differ for the OES half float extensions and desktop GL spec.
              // Update it.
              result = GL_HALF_FLOAT;
          }
      }
      else if (functions->isAtLeastGLES(gl::Version(3, 0)))
      {
          if (type == GL_HALF_FLOAT_OES)
          {
              switch (format)
              {
                  case GL_LUMINANCE_ALPHA:
                  case GL_LUMINANCE:
                  case GL_ALPHA:
                      // In ES3, these formats come from EXT_texture_storage, which uses
                      // HALF_FLOAT_OES. Other formats (like RGBA) use HALF_FLOAT (non-OES) in ES3.
                      break;
  
                  default:
                      result = GL_HALF_FLOAT;
                      break;
              }
          }
      }
  
      return result;
  }
  
  static GLenum GetNativeReadType(const FunctionsGL *functions,
                                  const WorkaroundsGL &workarounds,
                                  GLenum type)
  {
      GLenum result = type;
  
      if (functions->standard == STANDARD_GL_DESKTOP || functions->isAtLeastGLES(gl::Version(3, 0)))
      {
          if (type == GL_HALF_FLOAT_OES)
          {
              // The enums differ for the OES half float extensions and desktop GL spec. Update it.
              result = GL_HALF_FLOAT;
          }
      }
  
      return result;
  }
  
  static GLenum GetNativeReadFormat(const FunctionsGL *functions,
                                    const WorkaroundsGL &workarounds,
                                    GLenum format)
  {
      GLenum result = format;
      return result;
  }
  
  TexImageFormat GetTexImageFormat(const FunctionsGL *functions,
                                   const WorkaroundsGL &workarounds,
                                   GLenum internalFormat,
                                   GLenum format,
                                   GLenum type)
  {
      TexImageFormat result;
      result.internalFormat = GetNativeInternalFormat(
          functions, workarounds, gl::GetInternalFormatInfo(internalFormat, type));
      result.format = GetNativeFormat(functions, workarounds, format);
      result.type   = GetNativeType(functions, workarounds, format, type);
      return result;
  }
  
  TexSubImageFormat GetTexSubImageFormat(const FunctionsGL *functions,
                                         const WorkaroundsGL &workarounds,
                                         GLenum format,
                                         GLenum type)
  {
      TexSubImageFormat result;
      result.format = GetNativeFormat(functions, workarounds, format);
      result.type   = GetNativeType(functions, workarounds, format, type);
      return result;
  }
  
  CompressedTexImageFormat GetCompressedTexImageFormat(const FunctionsGL *functions,
                                                       const WorkaroundsGL &workarounds,
                                                       GLenum internalFormat)
  {
      CompressedTexImageFormat result;
      result.internalFormat = GetNativeCompressedFormat(functions, workarounds, internalFormat);
      return result;
  }
  
  CompressedTexSubImageFormat GetCompressedSubTexImageFormat(const FunctionsGL *functions,
                                                             const WorkaroundsGL &workarounds,
                                                             GLenum format)
  {
      CompressedTexSubImageFormat result;
      result.format = GetNativeCompressedFormat(functions, workarounds, format);
      return result;
  }
  
  CopyTexImageImageFormat GetCopyTexImageImageFormat(const FunctionsGL *functions,
                                                     const WorkaroundsGL &workarounds,
                                                     GLenum internalFormat,
                                                     GLenum framebufferType)
  {
      CopyTexImageImageFormat result;
      result.internalFormat = GetNativeInternalFormat(
          functions, workarounds, gl::GetInternalFormatInfo(internalFormat, framebufferType));
      return result;
  }
  
  TexStorageFormat GetTexStorageFormat(const FunctionsGL *functions,
                                       const WorkaroundsGL &workarounds,
                                       GLenum internalFormat)
  {
      TexStorageFormat result;
      result.internalFormat = GetNativeInternalFormat(functions, workarounds,
                                                      gl::GetSizedInternalFormatInfo(internalFormat));
      return result;
  }
  
  RenderbufferFormat GetRenderbufferFormat(const FunctionsGL *functions,
                                           const WorkaroundsGL &workarounds,
                                           GLenum internalFormat)
  {
      RenderbufferFormat result;
      result.internalFormat = GetNativeInternalFormat(functions, workarounds,
                                                      gl::GetSizedInternalFormatInfo(internalFormat));
      return result;
  }
  ReadPixelsFormat GetReadPixelsFormat(const FunctionsGL *functions,
                                       const WorkaroundsGL &workarounds,
                                       GLenum format,
                                       GLenum type)
  {
      ReadPixelsFormat result;
      result.format = GetNativeReadFormat(functions, workarounds, format);
      result.type   = GetNativeReadType(functions, workarounds, type);
      return result;
  }
  }
  
  }
  

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