Add epoxy_glsl_version()

Epoxy should provide a function that returns the version of the GL
shading language in use, in the same vein as it allows to get the
version of GL.

Closes: #145

1 files changed, 1 insertions, 0 deletions

diff --git a/include/epoxy/gl.h b/include/epoxy/gl.h
index ce4763f..1fef4ba 100644
--- a/include/epoxy/gl.h
+++ b/include/epoxy/gl.h
@@ -91,6 +91,7 @@ EPOXY_BEGIN_DECLS
 EPOXY_PUBLIC bool epoxy_has_gl_extension(const char *extension);
 EPOXY_PUBLIC bool epoxy_is_desktop_gl(void);
 EPOXY_PUBLIC int epoxy_gl_version(void);
+EPOXY_PUBLIC int epoxy_glsl_version(void);
 
 /*
  * the type of the stub function that the failure handler must return;