mesa: initialize OutsideBeginEnd directly instead of through Exec

Exec is just a mutable pointer to one of the dispatch tables.
OutsideBeginEnd is what we are actually initializing here. This makes
the original intention clear.

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18828>

src/mapi/glapi/gen/api_exec_init.py

@@ -22,7 +22,7 @@
 
 # This script generates the file api_exec_init.c, which contains
 # _mesa_initialize_exec_table().  It is responsible for populating all
-# entries in the "exec" dispatch table that aren't dynamic.
+# entries in the "OutsideBeginEnd" dispatch table.
 
 import argparse
 import collections
@@ -53,21 +53,19 @@ header = """/**
 
 
 /**
- * Initialize a context's exec table with pointers to Mesa's supported
+ * Initialize a context's OutsideBeginEnd table with pointers to Mesa's supported
  * GL functions.
  *
  * This function depends on ctx->Version.
  *
- * \param ctx  GL context to which \c exec belongs.
+ * \param ctx  GL context
  */
 void
 _mesa_initialize_exec_table(struct gl_context *ctx)
 {
-   struct _glapi_table *exec;
-
-   exec = ctx->Exec;
-   assert(exec != NULL);
+   struct _glapi_table *table = ctx->OutsideBeginEnd;
 
+   assert(table != NULL);
    assert(ctx->Version > 0);
 """
 
@@ -113,12 +111,12 @@ class PrintCode(gl_XML.gl_print_base):
                 no_error_condition = '_mesa_is_no_error_enabled(ctx) && ({0})'.format(condition)
                 error_condition = '!_mesa_is_no_error_enabled(ctx) && ({0})'.format(condition)
                 settings_by_condition[no_error_condition].append(
-                    'SET_{0}(exec, {1}{0}_no_error);'.format(f.name, prefix, f.name))
+                    'SET_{0}(table, {1}{0}_no_error);'.format(f.name, prefix, f.name))
                 settings_by_condition[error_condition].append(
-                    'SET_{0}(exec, {1}{0});'.format(f.name, prefix, f.name))
+                    'SET_{0}(table, {1}{0});'.format(f.name, prefix, f.name))
             else:
                 settings_by_condition[condition].append(
-                    'SET_{0}(exec, {1}{0});'.format(f.name, prefix, f.name))
+                    'SET_{0}(table, {1}{0});'.format(f.name, prefix, f.name))
         # Print out an if statement for each unique condition, with
         # the SET_* calls nested inside it.
         for condition in sorted(settings_by_condition.keys()):

src/mesa/main/dlist.c

@@ -13615,7 +13615,7 @@ _mesa_initialize_save_table(const struct gl_context *ctx)
     * normal-execution dispatch table.  This lets us skip populating functions
     * that should be called directly instead of compiled into display lists.
     */
-   memcpy(table, ctx->Exec, numEntries * sizeof(_glapi_proc));
+   memcpy(table, ctx->OutsideBeginEnd, numEntries * sizeof(_glapi_proc));
 
 #include "api_save_init.h"
 }

src/mesa/vbo/vbo_exec_api.c

@@ -1076,7 +1076,7 @@ vbo_install_exec_vtxfmt(struct gl_context *ctx)
 #define NAME(x) _mesa_##x
 #define NAME_ES(x) _es_##x
 
-   struct _glapi_table *tab = ctx->Exec;
+   struct _glapi_table *tab = ctx->OutsideBeginEnd;
    #include "api_vtxfmt_init.h"
 
    if (ctx->BeginEnd) {