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Diffstat (limited to 'mesalib/src/mesa/main/bufferobj.c')
-rw-r--r--mesalib/src/mesa/main/bufferobj.c13
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);
}
}