ui/gl/gl_version_info.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/gl/gl_version_info.h"
   6
   7 #include "base/strings/string_number_conversions.h"
   8 #include "base/strings/string_tokenizer.h"
   9 #include "base/strings/string_util.h"
  10
  11 namespace {
  12
  13 bool DesktopCoreCommonCheck(
  14     bool is_es, unsigned major_version, unsigned minor_version) {
  15   return (!is_es &&
  16           ((major_version == 3 && minor_version >= 2) ||
  17            major_version > 3));
  18 }
  19
  20 }
  21
  22
  23 namespace gfx {
  24
  25 GLVersionInfo::GLVersionInfo(const char* version_str, const char* renderer_str,
  26                              const char* extensions_str)
  27     : GLVersionInfo(version_str, renderer_str) {
  28   is_desktop_core_profile =
  29       DesktopCoreCommonCheck(is_es, major_version, minor_version) &&
  30       !strstr(extensions_str, "GL_ARB_compatibility");
  31 }
  32
  33 GLVersionInfo::GLVersionInfo(const char* version_str, const char* renderer_str,
  34                              const std::set<std::string>& extensions)
  35     : GLVersionInfo(version_str, renderer_str) {
  36   is_desktop_core_profile =
  37       DesktopCoreCommonCheck(is_es, major_version, minor_version) &&
  38       extensions.find("GL_ARB_compatibility") == extensions.end();
  39 }
  40
  41 GLVersionInfo::GLVersionInfo(const char* version_str, const char* renderer_str)
  42     : is_es(false),
  43       is_angle(false),
  44       major_version(0),
  45       minor_version(0),
  46       is_es3(false),
  47       is_desktop_core_profile(false) {
  48   if (version_str) {
  49     ParseVersionString(version_str, &major_version, &minor_version,
  50                        &is_es, &is_es3);
  51   }
  52   if (renderer_str) {
  53     is_angle = base::StartsWith(renderer_str, "ANGLE",
  54                                 base::CompareCase::SENSITIVE);
  55   }
  56 }
  57
  58 void GLVersionInfo::ParseVersionString(const char* version_str,
  59                                        unsigned* major_version,
  60                                        unsigned* minor_version,
  61                                        bool* is_es,
  62                                        bool* is_es3) {
  63   // Make sure the outputs are always initialized.
  64   *major_version = 0;
  65   *minor_version = 0;
  66   *is_es = false;
  67   *is_es3 = false;
  68   if (!version_str)
  69     return;
  70   std::string lstr(base::StringToLowerASCII(std::string(version_str)));
  71   *is_es = (lstr.length() > 12) && (lstr.substr(0, 9) == "opengl es");
  72   if (*is_es)
  73     lstr = lstr.substr(10, 3);
  74   base::StringTokenizer tokenizer(lstr.begin(), lstr.end(), ".");
  75   unsigned major, minor;
  76   if (tokenizer.GetNext() &&
  77       base::StringToUint(tokenizer.token_piece(), &major)) {
  78     *major_version = major;
  79     if (tokenizer.GetNext() &&
  80         base::StringToUint(tokenizer.token_piece(), &minor)) {
  81       *minor_version = minor;
  82     }
  83   }
  84   if (*is_es && *major_version == 3)
  85     *is_es3 = true;
  86 }
  87
  88 }  // namespace gfx