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

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• Hash : dab84368
  Author :
  Date : 2015-03-02T15:43:57
  

  Add texture format utilities for GL and generate GL texture caps.
  
  BUG=angleproject:884
  
  Change-Id: Ib1b13f59a6b21399c4b35695c704c369f572914e
  Reviewed-on: https://chromium-review.googlesource.com/264399
  Tested-by: Geoff Lang <geofflang@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 <map>
  
  namespace rx
  {
  
  namespace nativegl
  {
  
  // Information about internal formats
  static bool AlwaysSupported(GLuint, GLuint, const std::vector<std::string> &)
  {
      return true;
  }
  
  static bool UnimplementedSupport(GLuint, GLuint, const std::vector<std::string> &)
  {
      return false;
  }
  
  static bool NeverSupported(GLuint, GLuint, const std::vector<std::string> &)
  {
      return false;
  }
  
  template <GLuint minMajorVersion, GLuint minMinorVersion>
  static bool RequireGL(GLuint major, GLuint minor, const std::vector<std::string> &)
  {
      return major > minMajorVersion || (major == minMajorVersion && minor >= minMinorVersion);
  }
  
  
  InternalFormat::InternalFormat()
      : textureSupport(NeverSupported),
        renderSupport(NeverSupported),
        filterSupport(NeverSupported)
  {
  }
  
  typedef std::pair<GLenum, InternalFormat> InternalFormatInfoPair;
  typedef std::map<GLenum, InternalFormat> InternalFormatInfoMap;
  
  // A helper function to insert data into the format map with fewer characters.
  static inline void InsertFormatMapping(InternalFormatInfoMap *map, GLenum internalFormat,
                                         InternalFormat::SupportCheckFunction textureSupport,
                                         InternalFormat::SupportCheckFunction renderSupport,
                                         InternalFormat::SupportCheckFunction filterSupport)
  {
      InternalFormat formatInfo;
      formatInfo.textureSupport = textureSupport;
      formatInfo.renderSupport = renderSupport;
      formatInfo.filterSupport = filterSupport;
      map->insert(std::make_pair(internalFormat, formatInfo));
  }
  
  static InternalFormatInfoMap BuildInternalFormatInfoMap()
  {
      InternalFormatInfoMap map;
  
      // From ES 3.0.1 spec, table 3.12
      InsertFormatMapping(&map, GL_NONE,              NeverSupported,       NeverSupported,       NeverSupported);
  
      //                       | Internal format     | Texture support     | Render support     | Filter support      |
      InsertFormatMapping(&map, GL_R8,                UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_R8_SNORM,          UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RG8,               UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RG8_SNORM,         UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGB8,              AlwaysSupported,      AlwaysSupported,      AlwaysSupported     );
      InsertFormatMapping(&map, GL_RGB8_SNORM,        UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGB565,            AlwaysSupported,      AlwaysSupported,      AlwaysSupported     );
      InsertFormatMapping(&map, GL_RGBA4,             AlwaysSupported,      AlwaysSupported,      AlwaysSupported     );
      InsertFormatMapping(&map, GL_RGB5_A1,           UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGBA8,             AlwaysSupported,      AlwaysSupported,      AlwaysSupported     );
      InsertFormatMapping(&map, GL_RGBA8_SNORM,       UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGB10_A2,          UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGB10_A2UI,        UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_SRGB8,             UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_SRGB8_ALPHA8,      UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_R11F_G11F_B10F,    UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGB9_E5,           UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_R8I,               UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_R8UI,              UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_R16I,              UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_R16UI,             UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_R32I,              UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_R32UI,             UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RG8I,              UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RG8UI,             UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RG16I,             UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RG16UI,            UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RG32I,             UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RG32UI,            UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGB8I,             UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGB8UI,            UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGB16I,            UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGB16UI,           UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGB32I,            UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGB32UI,           UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGBA8I,            UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGBA8UI,           UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGBA16I,           UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGBA16UI,          UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGBA32I,           UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGBA32UI,          UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
  
      InsertFormatMapping(&map, GL_BGRA8_EXT,         UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
  
      // Floating point formats
      //                       | Internal format     | Texture support     | Render support     | Filter support      |
      InsertFormatMapping(&map, GL_R16F,              UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RG16F,             UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGB16F,            UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGBA16F,           UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_R32F,              UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RG32F,             UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGB32F,            UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGBA32F,           UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
  
      // Depth stencil formats
      //                       | Internal format         | Texture support     | Render support     | Filter support      |
      InsertFormatMapping(&map, GL_DEPTH_COMPONENT16,     AlwaysSupported,      AlwaysSupported,      NeverSupported      );
      InsertFormatMapping(&map, GL_DEPTH_COMPONENT24,     UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_DEPTH_COMPONENT32F,    UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_DEPTH_COMPONENT32_OES, UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_DEPTH24_STENCIL8,      UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_DEPTH32F_STENCIL8,     UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_STENCIL_INDEX8,        AlwaysSupported,      AlwaysSupported,      NeverSupported      );
  
      // Luminance alpha formats
      //                       | Internal format          | Texture support     | Render support     | Filter support      |
      InsertFormatMapping(&map, GL_ALPHA8_EXT,             UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_LUMINANCE8_EXT,         UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_ALPHA32F_EXT,           UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_LUMINANCE32F_EXT,       UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_ALPHA16F_EXT,           UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_LUMINANCE16F_EXT,       UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_LUMINANCE8_ALPHA8_EXT,  UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_LUMINANCE_ALPHA32F_EXT, UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_LUMINANCE_ALPHA16F_EXT, UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
  
      // Unsized formats
      //                       | Internal format   | Texture support     | Render support     | Filter support      |
      InsertFormatMapping(&map, GL_ALPHA,           UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_LUMINANCE,       UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_LUMINANCE_ALPHA, UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RED,             UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RG,              UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGB,             UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGBA,            UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RED_INTEGER,     UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RG_INTEGER,      UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGB_INTEGER,     UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_RGBA_INTEGER,    UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_BGRA_EXT,        UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_DEPTH_COMPONENT, UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_DEPTH_STENCIL,   UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_SRGB_EXT,        UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_SRGB_ALPHA_EXT,  UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
  
      // Compressed formats, From ES 3.0.1 spec, table 3.16
      //                       | Internal format                             | Texture support     | Render support     | Filter support      |
      InsertFormatMapping(&map, GL_COMPRESSED_R11_EAC,                        UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_COMPRESSED_SIGNED_R11_EAC,                 UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_COMPRESSED_RG11_EAC,                       UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_COMPRESSED_SIGNED_RG11_EAC,                UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_COMPRESSED_RGB8_ETC2,                      UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_COMPRESSED_SRGB8_ETC2,                     UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2,  UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2, UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_COMPRESSED_RGBA8_ETC2_EAC,                 UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC,          UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
  
      // From GL_EXT_texture_compression_dxt1
      //                       | Internal format                   | Texture support     | Render support     | Filter support      |
      InsertFormatMapping(&map, GL_COMPRESSED_RGB_S3TC_DXT1_EXT,    UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
      InsertFormatMapping(&map, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT,   UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
  
      // From GL_ANGLE_texture_compression_dxt3
      InsertFormatMapping(&map, GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE, UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
  
      // From GL_ANGLE_texture_compression_dxt5
      InsertFormatMapping(&map, GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE, UnimplementedSupport, UnimplementedSupport, UnimplementedSupport);
  
      return map;
  }
  
  static const InternalFormatInfoMap &GetInternalFormatMap()
  {
      static const InternalFormatInfoMap formatMap = BuildInternalFormatInfoMap();
      return formatMap;
  }
  
  const InternalFormat &GetInternalFormatInfo(GLenum internalFormat)
  {
      const InternalFormatInfoMap &formatMap = GetInternalFormatMap();
      InternalFormatInfoMap::const_iterator iter = formatMap.find(internalFormat);
      if (iter != formatMap.end())
      {
          return iter->second;
      }
      else
      {
          static const InternalFormat defaultInternalFormat;
          return defaultInternalFormat;
      }
  }
  
  }
  
  }
  

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