bool is_supported(const string &ext)
{
static set<string> extensions;
- static bool init_done=false;
+ static bool init_done = false;
if(!init_done)
{
- if(const char *gl_ext=reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
+ if(const char *gl_ext = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
{
- vector<string> exts=split(gl_ext);
+ vector<string> exts = split(gl_ext);
extensions.insert(exts.begin(), exts.end());
}
if(extensions.count("GL_ARB_vertex_buffer_object"))
init_arb_vertex_buffer_object();
- init_done=true;
+ init_done = true;
}
return extensions.count(ext);
}
+void require_extension(const string &ext)
+{
+ if(!is_supported(ext))
+ throw UnsupportedExtension(ext);
+}
+
const Version &get_gl_version()
{
static Version version;
- static bool init_done=false;
+ static bool init_done = false;
if(!init_done)
{
- string gl_ver=reinterpret_cast<const char *>(glGetString(GL_VERSION));
- vector<string> parts=split(gl_ver.substr(0, gl_ver.find(' ')), '.');
- version.major=lexical_cast<unsigned>(parts[0]);
- version.minor=lexical_cast<unsigned>(parts[1]);
+ string gl_ver = reinterpret_cast<const char *>(glGetString(GL_VERSION));
+ vector<string> parts = split(gl_ver.substr(0, gl_ver.find(' ')), '.');
+ version.major = lexical_cast<unsigned>(parts[0]);
+ version.minor = lexical_cast<unsigned>(parts[1]);
- unsigned combined=version.major*0x100+version.minor;
+ unsigned combined = version.major*0x100+version.minor;
if(combined>=0x102)
init_version_1_2();
if(combined>=0x103)
return version;
}
-void require_extension(const string &ext)
+bool is_version_at_least(unsigned a, unsigned b)
{
- if(!is_supported(ext))
- throw UnsupportedExtension(ext);
+ const Version &ver = get_gl_version();
+ return (ver.major>a || (ver.major==a && ver.minor>=b));
}
void require_version(unsigned a, unsigned b)
{
- const Version &ver=get_gl_version();
- if(ver.major<a || (ver.major==a && ver.minor<b))
+ if(!is_version_at_least(a, b))
throw UnsupportedExtension(format("OpenGL %d.%d", a, b));
}