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::StartsWithASCII(renderer_str, "ANGLE", true);
  54   }
  55 }
  56
  57 void GLVersionInfo::ParseVersionString(const char* version_str,
  58                                        unsigned* major_version,
  59                                        unsigned* minor_version,
  60                                        bool* is_es,
  61                                        bool* is_es3) {
  62   // Make sure the outputs are always initialized.
  63   *major_version = 0;
  64   *minor_version = 0;
  65   *is_es = false;
  66   *is_es3 = false;
  67   if (!version_str)
  68     return;
  69   std::string lstr(base::StringToLowerASCII(std::string(version_str)));
  70   *is_es = (lstr.length() > 12) && (lstr.substr(0, 9) == "opengl es");
  71   if (*is_es)
  72     lstr = lstr.substr(10, 3);
  73   base::StringTokenizer tokenizer(lstr.begin(), lstr.end(), ".");
  74   unsigned major, minor;
  75   if (tokenizer.GetNext() &&
  76       base::StringToUint(tokenizer.token_piece(), &major)) {
  77     *major_version = major;
  78     if (tokenizer.GetNext() &&
  79         base::StringToUint(tokenizer.token_piece(), &minor)) {
  80       *minor_version = minor;
  81     }
  82   }
  83   if (*is_es && *major_version == 3)
  84     *is_es3 = true;
  85 }
  86
  87 }  // namespace gfx