std::set<GLextension> ContextInfo::extensions(std::set<std::string> * const unknown)
{
const auto v = version();
if (v <= Version(1, 0)) // OpenGL 1.0 doesn't support extensions
{
return std::set<GLextension>{};
}
auto extensions = std::set<GLextension>{};
if (v < Version(3, 0))
{
const auto extensionString = glGetString(GL_EXTENSIONS);
if (extensionString)
{
std::istringstream stream{reinterpret_cast<const char *>(extensionString)};
auto extensionName = std::string{};
while (std::getline(stream, extensionName, ' '))
{
insertExtension(extensionName, &extensions, unknown);
}
}
}
else
{
auto numExtensions = 0;
glGetIntegerv(GL_NUM_EXTENSIONS, &numExtensions);
for (GLuint i = 0; i < static_cast<GLuint>(numExtensions); ++i)
{
const auto name = glGetStringi(GL_EXTENSIONS, i);
if (name)
{
insertExtension(reinterpret_cast<const char*>(name), &extensions, unknown);
}
}
}
return extensions;
}
bool QXmppClient::addExtension(QXmppClientExtension* extension)
{
return insertExtension(d->extensions.size(), extension);
}