void ensureExtensionsInit()
{
#if !defined(SFML_OPENGL_ES)
static bool initialized = false;
if (!initialized)
{
initialized = true;
sfogl_LoadFunctions();
// Retrieve the context version number
int majorVersion = 0;
int minorVersion = 0;
// Try the new way first
glGetIntegerv(GL_MAJOR_VERSION, &majorVersion);
glGetIntegerv(GL_MINOR_VERSION, &minorVersion);
if (glGetError() == GL_INVALID_ENUM)
{
// Try the old way
const GLubyte* version = glGetString(GL_VERSION);
if (version)
{
// The beginning of the returned string is "major.minor" (this is standard)
majorVersion = version[0] - '0';
minorVersion = version[2] - '0';
}
else
{
// Can't get the version number, assume 1.1
majorVersion = 1;
minorVersion = 1;
}
}
if ((majorVersion < 1) || ((majorVersion == 1) && (minorVersion < 1)))
{
err() << "sfml-graphics requires support for OpenGL 1.1 or greater" << std::endl;
err() << "Ensure that hardware acceleration is enabled if available" << std::endl;
}
}
#endif
}
void ensureExtensionsInit()
{
#if !defined(SFML_OPENGL_ES)
static bool initialized = false;
if (!initialized)
{
int loaded = sfogl_LoadFunctions();
if (!sfogl_IsVersionGEQ(1, 2))
{
err() << "sfml-graphics requires support for OpenGL 1.2 or greater" << std::endl;
err() << "Ensure that hardware acceleration is enabled if available" << std::endl;
return;
}
if (loaded == sfogl_LOAD_FAILED)
{
err() << "Failed to initialize OpenGL 1.2 entry points, ";
err() << "number of functions that failed to load: " << loaded - sfogl_LOAD_SUCCEEDED << std::endl;
return;
}
bool missing = false;
if (sfogl_ext_EXT_blend_minmax == sfogl_LOAD_FAILED)
{
err() << "Required extension EXT_blend_minmax unavailable" << std::endl;
missing = true;
}
if (sfogl_ext_EXT_blend_subtract == sfogl_LOAD_FAILED)
{
err() << "Required extension EXT_blend_subtract unavailable" << std::endl;
missing = true;
}
if (!missing)
{
initialized = true;
}
}
#endif
}
