+ /**
+ * Generate a string representing the GLSL version currently being compiled
+ * (useful for error messages).
+ */
+ const char *get_version_string()
+ {
+ return glsl_compute_version_string(this, this->es_shader,
+ this->language_version);
+ }
+
+ /**
+ * Determine whether the current GLSL version is sufficiently high to
+ * support a certain feature.
+ *
+ * \param required_glsl_version is the desktop GLSL version that is
+ * required to support the feature, or 0 if no version of desktop GLSL
+ * supports the feature.
+ *
+ * \param required_glsl_es_version is the GLSL ES version that is required
+ * to support the feature, or 0 if no version of GLSL ES suports the
+ * feature.
+ */
+ bool is_version(unsigned required_glsl_version,
+ unsigned required_glsl_es_version)
+ {
+ unsigned required_version = this->es_shader ?
+ required_glsl_es_version : required_glsl_version;
+ return required_version != 0
+ && this->language_version >= required_version;
+ }
+
+ bool check_version(unsigned required_glsl_version,
+ unsigned required_glsl_es_version,
+ YYLTYPE *locp, const char *fmt, ...) PRINTFLIKE(5, 6);
+
+ bool check_precision_qualifiers_allowed(YYLTYPE *locp)
+ {
+ return check_version(130, 100, locp,
+ "precision qualifiers are forbidden");
+ }
+
+ bool check_bitwise_operations_allowed(YYLTYPE *locp)
+ {
+ return check_version(130, 300, locp, "bit-wise operations are forbidden");
+ }
+
+ void process_version_directive(YYLTYPE *locp, int version,
+ const char *ident);
+
+ struct gl_context *const ctx;