diff options
Diffstat (limited to 'mesalib/src/mesa/main/bufferobj.c')
| -rw-r--r-- | mesalib/src/mesa/main/bufferobj.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/mesalib/src/mesa/main/bufferobj.c b/mesalib/src/mesa/main/bufferobj.c index 67241eb1e..f2e8f568c 100644 --- a/mesalib/src/mesa/main/bufferobj.c +++ b/mesalib/src/mesa/main/bufferobj.c @@ -571,7 +571,7 @@ bind_buffer_object(struct gl_context *ctx, GLenum target, GLuint buffer) /* Get pointer to old buffer object (to be unbound) */ oldBufObj = *bindTarget; - if (oldBufObj && oldBufObj->Name == buffer) + if (oldBufObj && oldBufObj->Name == buffer && !oldBufObj->DeletePending) return; /* rebinding the same buffer object- no change */ /* @@ -773,6 +773,17 @@ _mesa_DeleteBuffersARB(GLsizei n, const GLuint *ids) /* The ID is immediately freed for re-use */ _mesa_HashRemove(ctx->Shared->BufferObjects, ids[i]); + /* Make sure we do not run into the classic ABA problem on bind. + * We don't want to allow re-binding a buffer object that's been + * "deleted" by glDeleteBuffers(). + * + * The explicit rebinding to the default object in the current context + * prevents the above in the current context, but another context + * sharing the same objects might suffer from this problem. + * The alternative would be to do the hash lookup in any case on bind + * which would introduce more runtime overhead than this. + */ + bufObj->DeletePending = GL_TRUE; _mesa_reference_buffer_object(ctx, &bufObj, NULL); } } |