Major rip-up of internal function insertion interface. The old

_glapi_add_entrypoint has been replaced by a new routine called
_glapi_add_dispatch.  This new routine dynamically assignes dispatch offsets
to functions added.  This allows IHVs to add support for extension functions
that do not have assigned dispatch offsets.

It also means that a driver has no idea what offset will be assigned to a
function.  The vast majority of the changes in this commit account for that.
An additional table, driDispatchRemapTable, is added.  Functions not in the
Linux OpenGL ABI (i.e., anything not in GL 1.2 + ARB_multitexture) has a
fixed offset in this new table.  The entry in this table specifies the
offset in of the function in the real dispatch table.

The internal interface was also bumped from version 20050725 to 20050727.

This has been tested with various programs in progs/demos on:

radeon (Radeon Mobility M6)
r128 (Rage 128 Pro)
mga (G400)

2 files changed, 14 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/r128/r128_context.c b/src/mesa/drivers/dri/r128/r128_context.c
index c0036c1490..f071bbecbf 100644
--- a/src/mesa/drivers/dri/r128/r128_context.c
+++ b/src/mesa/drivers/dri/r128/r128_context.c
@@ -71,7 +71,7 @@ int R128_DEBUG = 0;
 #define need_GL_EXT_blend_minmax
 #include "extension_helper.h"
 
-static const struct dri_extension card_extensions[] =
+const struct dri_extension card_extensions[] =
 {
     { "GL_ARB_multisample",                GL_ARB_multisample_functions },
     { "GL_ARB_multitexture",               NULL },
diff --git a/src/mesa/drivers/dri/r128/r128_screen.c b/src/mesa/drivers/dri/r128/r128_screen.c
index f5d0287ed9..b6177bf691 100644
--- a/src/mesa/drivers/dri/r128/r128_screen.c
+++ b/src/mesa/drivers/dri/r128/r128_screen.c
@@ -75,6 +75,8 @@ static const GLuint __driNConfigOptions = 4;
 static const GLuint __driNConfigOptions = 3;
 #endif
 
+extern const struct dri_extension card_extensions[];
+
 #if 1
 /* Including xf86PciInfo.h introduces a bunch of errors...
  */
@@ -482,7 +484,7 @@ r128FillInModes( unsigned pixel_bits, unsigned depth_bits,
  *         failure.
  */
 PUBLIC
-void * __driCreateNewScreen_20050725( __DRInativeDisplay *dpy, int scrn, __DRIscreen *psc,
+void * __driCreateNewScreen_20050727( __DRInativeDisplay *dpy, int scrn, __DRIscreen *psc,
 			     const __GLcontextModes * modes,
 			     const __DRIversion * ddx_version,
 			     const __DRIversion * dri_version,
@@ -519,6 +521,16 @@ void * __driCreateNewScreen_20050725( __DRInativeDisplay *dpy, int scrn, __DRIsc
 				       (dri_priv->bpp == 16) ? 16 : 24,
 				       (dri_priv->bpp == 16) ? 0  : 8,
 				       (dri_priv->backOffset != dri_priv->depthOffset) );
+
+      /* Calling driInitExtensions here, with a NULL context pointer, does not actually
+       * enable the extensions.  It just makes sure that all the dispatch offsets for all
+       * the extensions that *might* be enables are known.  This is needed because the
+       * dispatch offsets need to be known when _mesa_context_create is called, but we can't
+       * enable the extensions until we have a context pointer.
+       *
+       * Hello chicken.  Hello egg.  How are you two today?
+       */
+      driInitExtensions( NULL, card_extensions, GL_FALSE );
    }
 
    return (void *) psp;