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mesa: do not use _glapi_new_nop_table() for DRI builds

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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>
This commit is contained in:
Brian Paul 2015-05-15 09:08:14 -06:00
parent 2ab0ca36c1
commit be71bbfaa2
1 changed files with 60 additions and 2 deletions
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62
src/mesa/main/context.c
View file

@ -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
/**
@ -923,7 +938,45 @@ 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.
*/
#if !USE_GLAPI_NOP_FEATURES
static struct _glapi_table *
new_nop_table(unsigned numEntries)
{
struct _glapi_table *table;
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;
}
}
return table;
}
#endif
@ -941,7 +994,11 @@ 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);
int numEntries = MAX2(_glapi_get_dispatch_table_size(), _gloffset_COUNT);
#if !USE_GLAPI_NOP_FEATURES
struct _glapi_table *table = new_nop_table(numEntries);
#else
struct _glapi_table *table = _glapi_new_nop_table(numEntries);
#if defined(_WIN32)
@ -967,6 +1024,7 @@ alloc_dispatch_table(void)
#endif
_glapi_set_nop_handler(nop_handler);
#endif
return table;
}