mesa: do not use _glapi_new_nop_table() for DRI builds

Commit 4bdbb588a9 introduced new _glapi_new_nop_table() and
_glapi_set_nop_handler() functions in the glapi dispatcher (which
live in libGL.so).  The calls to those functions from context.c
would be undefined (i.e. an ABI break) if the libGL used at runtime
was older.

For the time being, use the old single generic_nop() function for
non-Windows builds to avoid this problem.  At some point in the future
it should be safe to remove this work-around.  See comments for more
details.

v2: Incorporate feedback from Emil.  Use _WIN32 instead of
GLX_DIRECT_RENDERING to control behavior, move comments.

Cc: 10.6 <mesa-stable@lists.freedesktop.org>
Reviewed-and-tested-by: Ian Romanick <ian.d.romanick@intel.com>
(cherry picked from commit be71bbfaa2)

Squashed with commit

glapi: Encapsulate nop table knowledge in new _mesa_new_nop_table function

Encapsulate the knowledge about how to build the nop table in a new
_mesa_new_nop_table function.  This makes it easier for dispatch_sanity
to keep working now and in the future.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Tested-by: Mark Janes <mark.a.janes@intel.com>
Cc: 10.6 <mesa-stable@lists.freedesktop.org>
(cherry picked from commit 2b8c51834b)

src/mesa/main/api_exec.h

@@ -38,6 +38,9 @@ _mesa_initialize_exec_table(struct gl_context *ctx);
 extern void
 _mesa_initialize_dispatch_tables(struct gl_context *ctx);
 
+extern struct _glapi_table *
+_mesa_new_nop_table(unsigned numEntries);
+
 #ifdef __cplusplus
 } // extern "C"
 #endif

src/mesa/main/context.c

@@ -883,6 +883,19 @@ update_default_objects(struct gl_context *ctx)
 }
 
 
+/* XXX this is temporary and should be removed at some point in the
+ * future when there's a reasonable expectation that the libGL library
+ * contains the _glapi_new_nop_table() and _glapi_set_nop_handler()
+ * functions which were added in Mesa 10.6.
+ */
+#if !defined(_WIN32)
+/* Avoid libGL / driver ABI break */
+#define USE_GLAPI_NOP_FEATURES 0
+#else
+#define USE_GLAPI_NOP_FEATURES 1
+#endif
+
+
 /**
  * This function is called by the glapi no-op functions.  For each OpenGL
  * function/entrypoint there's a simple no-op function.  These "no-op"
@@ -898,6 +911,7 @@ update_default_objects(struct gl_context *ctx)
  *
  * \param name  the name of the OpenGL function
  */
+#if USE_GLAPI_NOP_FEATURES
 static void
 nop_handler(const char *name)
 {
@@ -914,6 +928,7 @@ nop_handler(const char *name)
    }
 #endif
 }
+#endif
 
 
 /**
@@ -923,11 +938,51 @@ nop_handler(const char *name)
 static void GLAPIENTRY
 nop_glFlush(void)
 {
-   /* don't record an error like we do in _mesa_generic_nop() */
+   /* don't record an error like we do in nop_handler() */
 }
 #endif
 
 
+#if !USE_GLAPI_NOP_FEATURES
+static int
+generic_nop(void)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   _mesa_error(ctx, GL_INVALID_OPERATION,
+               "unsupported function called "
+               "(unsupported extension or deprecated function?)");
+   return 0;
+}
+#endif
+
+
+/**
+ * Create a new API dispatch table in which all entries point to the
+ * generic_nop() function.  This will not work on Windows because of
+ * the __stdcall convention which requires the callee to clean up the
+ * call stack.  That's impossible with one generic no-op function.
+ */
+struct _glapi_table *
+_mesa_new_nop_table(unsigned numEntries)
+{
+   struct _glapi_table *table;
+
+#if !USE_GLAPI_NOP_FEATURES
+   table = malloc(numEntries * sizeof(_glapi_proc));
+   if (table) {
+      _glapi_proc *entry = (_glapi_proc *) table;
+      unsigned i;
+      for (i = 0; i < numEntries; i++) {
+         entry[i] = (_glapi_proc) generic_nop;
+      }
+   }
+#else
+   table = _glapi_new_nop_table(numEntries);
+#endif
+   return table;
+}
+
+
 /**
  * Allocate and initialize a new dispatch table.  The table will be
  * populated with pointers to "no-op" functions.  In turn, the no-op
@@ -941,8 +996,9 @@ alloc_dispatch_table(void)
     * Mesa we do this to accommodate different versions of libGL and various
     * DRI drivers.
     */
-   GLint numEntries = MAX2(_glapi_get_dispatch_table_size(), _gloffset_COUNT);
-   struct _glapi_table *table = _glapi_new_nop_table(numEntries);
+   int numEntries = MAX2(_glapi_get_dispatch_table_size(), _gloffset_COUNT);
+
+   struct _glapi_table *table = _mesa_new_nop_table(numEntries);
 
 #if defined(_WIN32)
    if (table) {
@@ -966,7 +1022,9 @@ alloc_dispatch_table(void)
    }
 #endif
 
+#if USE_GLAPI_NOP_FEATURES
    _glapi_set_nop_handler(nop_handler);
+#endif
 
    return table;
 }

src/mesa/main/tests/dispatch_sanity.cpp

@@ -96,7 +96,7 @@ DispatchSanity_test::SetUp()
    _mesa_init_driver_functions(&driver_functions);
 
    const unsigned size = _glapi_get_dispatch_table_size();
-   nop_table = (_glapi_proc *) _glapi_new_nop_table(size);
+   nop_table = (_glapi_proc *) _mesa_new_nop_table(size);
 }
 
 void