From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 25 Nov 2013 15:22:12 +0000 (+0200)
Subject: Add function to check GLSL version
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=f92c10f969a02e707a236cb364332bf079cdf4fc

Add function to check GLSL version
---

diff --git a/source/extension.cpp b/source/extension.cpp
index 41b06b21..d0361665 100644
--- a/source/extension.cpp
+++ b/source/extension.cpp
@@ -103,6 +103,18 @@ const Version &get_gl_version()
 	return version;
 }
 
+inline Version _get_glsl_version()
+{
+	string glsl_ver = reinterpret_cast<const char *>(glGetString(GL_SHADING_LANGUAGE_VERSION));
+	return Version(glsl_ver.substr(0, glsl_ver.find(' ')));
+}
+
+const Version &get_glsl_version()
+{
+	static Version version = _get_glsl_version();
+	return version;
+}
+
 bool is_version_at_least(unsigned a, unsigned b)
 {
 	return get_gl_version()>=Version(a, b);
diff --git a/source/extension.h b/source/extension.h
index df6bd78d..e0fe3eff 100644
--- a/source/extension.h
+++ b/source/extension.h
@@ -59,6 +59,9 @@ bool is_supported(const std::string &);
 /** Returns the OpenGL version number, as reported by the implementation. */
 const Version &get_gl_version();
 
+/** Returns the GLSL version number, as reported by the implementation. */
+const Version &get_glsl_version();
+
 /** Indicates whether the OpenGL version is at least a.b. */
 bool is_version_at_least(unsigned a, unsigned b);