X-Git-Url: https://git.cworth.org/git?p=fips;a=blobdiff_plain;f=glwrap.h;h=6acf3fcdb98cc00c86f690d217a070ddc1d0a96e;hp=81e1e34c9f0ccc11980de3e70caf42366dd501c2;hb=79edc7574c353a7ae8d2455ecc3a94aa956b3c8e;hpb=b8b9a79e315bf3a030c3b0840ad1490746b5a8e0

diff --git a/glwrap.h b/glwrap.h
index 81e1e34..6acf3fc 100644
--- a/glwrap.h
+++ b/glwrap.h
@@ -22,10 +22,31 @@
 #ifndef GLWRAP_H
 #define GLWRAP_H
 
-/* Should be called at the end of ever function wrapper for an OpenGL
- * function that ends a frame, (glXSwapBuffers and similar).
- */
+/* Lookup a function named 'name' in the underlying, real, libGL.so */
+void *
+glwrap_lookup (char *name);
+
+/* Register a dlopened handle to be used by glwrap. */
 void
-glwrap_end_frame (void);
+glwrap_set_gl_handle (void *handle);
+
+/* Defer to the real 'function' (from libGL.so) to do the real work.
+ * The symbol is looked up once and cached in a static variable for
+ * future uses.
+ */
+#define GLWRAP_DEFER(function,...) do {				\
+	static typeof(&function) real_ ## function;		\
+	if (! real_ ## function)				\
+		real_ ## function = glwrap_lookup (#function);	\
+	real_ ## function(__VA_ARGS__); 			\
+} while (0);
+
+/* As GLWRAP_DEFER, but also set 'ret' to the return value */
+#define GLWRAP_DEFER_WITH_RETURN(ret, function,...) do {	\
+	static typeof(&function) real_ ## function;		\
+	if (! real_ ## function)				\
+		real_ ## function = glwrap_lookup (#function);	\
+	(ret) = real_ ## function(__VA_ARGS__); 		\
+} while (0);
 
 #endif