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_glapi_add_entrypoint has been replaced by a new routine called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, 12 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/r300/r300_context.c b/src/mesa/drivers/dri/r300/r300_context.c
index 9100ac2565..b3017372fe 100644
--- a/src/mesa/drivers/dri/r300/r300_context.c
+++ b/src/mesa/drivers/dri/r300/r300_context.c
@@ -73,7 +73,7 @@ int hw_tcl_on=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},
   {"GL_ARB_texture_border_clamp",	NULL},
diff --git a/src/mesa/drivers/dri/r300/radeon_screen.c b/src/mesa/drivers/dri/r300/radeon_screen.c
index bc65dd81b8..18919ddeb1 100644
--- a/src/mesa/drivers/dri/r300/radeon_screen.c
+++ b/src/mesa/drivers/dri/r300/radeon_screen.c
@@ -132,6 +132,7 @@ DRI_CONF_BEGIN
 DRI_CONF_END;
 static const GLuint __driR300NConfigOptions = 13;
 
+extern const struct dri_extension card_extensions[];
 
 #ifndef RADEON_DEBUG
 int RADEON_DEBUG = 0;
@@ -789,7 +790,7 @@ static const struct __DriverAPIRec radeonAPI = {
  * \return A pointer to a \c __DRIscreenPrivate on success, or \c NULL on
  *         failure.
  */
-void *__driCreateNewScreen_20050725(__DRInativeDisplay * dpy, int scrn,
+void *__driCreateNewScreen_20050727(__DRInativeDisplay * dpy, int scrn,
 			   __DRIscreen * psc, const __GLcontextModes * modes,
 			   const __DRIversion * ddx_version,
 			   const __DRIversion * dri_version,
@@ -826,6 +827,15 @@ void *__driCreateNewScreen_20050725(__DRInativeDisplay * dpy, int scrn,
 						   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;