Replace add_newer_entrypoints (src/mesa/main/context.c) with

device-specific code.  A new Python script
(src/mesa/glapi/extension_helper.py) generates a list of all
entry-points for all known extensions.  Each driver the selects only
the extensions that it needs and enables the via either
driInitExtensions or driInitSingleExtension.

This code has been compile-tested on a drivers, but has only been
run-tested on mga and i915 (on i830 hardware).

These changes were discussed at length on the mesa3d-dev mailing list.

http://marc.theaimsgroup.com/?t=111947074700001&r=1&w=2

src/mesa/drivers/dri/common/utils.h

@@ -32,12 +32,52 @@
 #include "context.h"
 #include "dri_util.h"
 
-struct dri_debug_control
-{
+struct dri_debug_control {
     const char * string;
     unsigned     flag;
 };
 
+/**
+ * Description of the entry-points and parameters for an OpenGL function.
+ */
+struct dri_extension_function {
+    /**
+     * \brief
+     * Packed string describing the parameter signature and the entry-point
+     * names.
+     * 
+     * The parameter signature and the names of the entry-points for this
+     * function are packed into a single string.  The substrings are
+     * separated by NUL characters.  The whole string is terminated by
+     * two consecutive NUL characters.
+     */
+    const char * strings;
+
+
+    /**
+     * Offset of the function in the dispatch table.
+     */
+    unsigned     offset;
+};
+
+/**
+ * Description of the API for an extension to OpenGL.
+ */
+struct dri_extension {
+    /**
+     * Name of the extension.
+     */
+    const char * name;
+    
+
+    /**
+     * Pointer to a list of \c dri_extension_function structures.  The list
+     * is terminated by a structure with a \c NULL
+     * \c dri_extension_function::strings pointer.
+     */
+    const struct dri_extension_function * functions;
+};
+
 extern unsigned driParseDebugString( const char * debug,
     const struct dri_debug_control * control );
 
@@ -45,7 +85,10 @@ extern unsigned driGetRendererString( char * buffer,
     const char * hardware_name, const char * driver_date, GLuint agp_mode );
 
 extern void driInitExtensions( GLcontext * ctx, 
-    const char * const card_extensions[], GLboolean enable_imaging );
+    const struct dri_extension * card_extensions, GLboolean enable_imaging );
+
+extern void driInitSingleExtension( GLcontext * ctx,
+    const struct dri_extension * ext );
 
 #ifndef DRI_NEW_INTERFACE_ONLY
 extern GLboolean driCheckDriDdxDrmVersions( __DRIscreenPrivate *sPriv,