X-Git-Url: https://git.ralfj.de/gltest.git/blobdiff_plain/b4dc0596570275aa9def5ff63af951beb8473d58..b0ce9e768aed86e894dcffae75e69a80c51e7b5d:/glutil.h

diff --git a/glutil.h b/glutil.h
index e7a39ad..dd1051e 100644
--- a/glutil.h
+++ b/glutil.h
@@ -23,5 +23,24 @@
 #include <GL/gl.h>
 #endif
 
+/**
+ * GNUC has the ability to check format strings that follow the syntax used in printf and others.
+Hide the differences between different compilers in this GNUC_FORMAT_CHECK macro.
+Copied from Wireshark sources.
+*/
+#if __GNUC__ >= 2
+	#define GNUC_FORMAT_CHECK(archetype, string_index, first_to_check) __attribute__((format (archetype, string_index, first_to_check)))
+#else
+	#define GNUC_FORMAT_CHECK(archetype, string_index, first_to_check)
+#endif
+
+/* Function name resolving: Call this after initialising the context, but before any utility function is called */
+typedef void (*T_proc)(void);
+typedef T_proc (*T_glGetProcAddress)(char const *  procname);
+void resolveFunctionPointers(T_glGetProcAddress p_glGetProcAddress);
+
+/* The actual utility functions */
+void die(const char *msg, ...) GNUC_FORMAT_CHECK(printf, 1, 2);
+void checkGlError(const char *what);
 void initialise2dProjection();
 void drawQuad(GLfloat red, GLfloat green, GLfloat blue, GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2);