X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fextension.cpp;h=fdbefb5336407e402ba0985985804ba4d527c241;hb=72efb2325bcac4ba2bfc243fe4766357681868a5;hp=56f96d4ecee2136dcde2d42f5fbdfa7bbf8b421b;hpb=710418caebcbcb9ed22bb828cb1dcd88d6b99aa1;p=libs%2Fgl.git

diff --git a/source/extension.cpp b/source/extension.cpp
index 56f96d4e..fdbefb53 100644
--- a/source/extension.cpp
+++ b/source/extension.cpp
@@ -14,6 +14,31 @@ using namespace std;
 namespace Msp {
 namespace GL {
 
+Version::Version()
+{
+	major = 0;
+	minor = 0;
+}
+
+Version::Version(unsigned short a, unsigned short i)
+{
+	major = a;
+	minor = i;
+}
+
+Version::Version(const string &s)
+{
+	vector<string> parts = split(s, '.');
+	major = lexical_cast<unsigned>(parts[0]);
+	minor = lexical_cast<unsigned>(parts[1]);
+}
+
+bool Version::operator>=(const Version &other) const
+{
+	return major>other.major || (major==other.major && minor>=other.minor);
+}
+
+
 Extension::Extension(const char *n, InitFunc f):
 	name(n),
 	init_func(f),
@@ -60,34 +85,64 @@ bool is_supported(const string &ext)
 			buffer. */
 			extensions.erase("GL_NV_primitive_restart");
 
+		if(const char *disable_ptr = getenv("MSPGL_DISABLE_EXTENSIONS"))
+		{
+			vector<string> disable = split(disable_ptr);
+			for(vector<string>::const_iterator i=disable.begin(); i!=disable.end(); ++i)
+				extensions.erase(*i);
+		}
+
 		init_done = true;
 	}
 
 	return extensions.count(ext);
 }
 
-const Version &get_gl_version()
+inline Version _get_gl_version()
 {
-	static Version version;
-	static bool init_done = false;
+	string gl_ver = reinterpret_cast<const char *>(glGetString(GL_VERSION));
+	Version ver(gl_ver.substr(0, gl_ver.find(' ')));
 
-	if(!init_done)
+	if(const char *force_ver_ptr = getenv("MSPGL_FORCE_VERSION"))
 	{
-		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]);
+		Version force_ver(force_ver_ptr);
+		if(!(force_ver>=ver))
+			ver = force_ver;
+	}
 
-		init_done = true;
+	return ver;
+}
+
+const Version &get_gl_version()
+{
+	static Version version = _get_gl_version();
+	return version;
+}
+
+inline Version _get_glsl_version()
+{
+	string glsl_ver = reinterpret_cast<const char *>(glGetString(GL_SHADING_LANGUAGE_VERSION));
+	Version ver(glsl_ver.substr(0, glsl_ver.find(' ')));
+
+	if(const char *force_ver_ptr = getenv("MSPGL_FORCE_GLSL_VERSION"))
+	{
+		Version force_ver(force_ver_ptr);
+		if(!(force_ver>=ver))
+			ver = force_ver;
 	}
 
+	return ver;
+}
+
+const Version &get_glsl_version()
+{
+	static Version version = _get_glsl_version();
 	return version;
 }
 
 bool is_version_at_least(unsigned a, unsigned b)
 {
-	const Version &ver = get_gl_version();
-	return (ver.major>a || (ver.major==a && ver.minor>=b));
+	return get_gl_version()>=Version(a, b);
 }
 
 ExtFunc *get_proc_address(const string &name)