This loop is trying to see if all the buffers to be uploaded happen to
be the same increment from the start of the 3DSTATE_VERTEX_BUFFERS
currently loaded in the hardware. However, we might be at a smaller
offset than the previous set of VERTEX_BUFFERS, so we can't reuse
because that packet made the first entry be its starting offset (you
can't access outside the given bounds).
Fixes piglit ARB_vertex_buffer_object/elements-negative-offset.
---
src/mesa/drivers/dri/i965/brw_draw_upload.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/src/mesa/drivers/dri/i965/brw_draw_upload.c
b/src/mesa/drivers/dri/i965/brw_draw_upload.c
index 13d3aa7..32a1d29 100644
--- a/src/mesa/drivers/dri/i965/brw_draw_upload.c
+++ b/src/mesa/drivers/dri/i965/brw_draw_upload.c
@@ -500,6 +500,8 @@ static void brw_prepare_vertices(struct brw_context *brw)
break;
d = brw->vb.buffers[i].offset - brw->vb.current_buffers[i].offset;
+ if (d < 0)
+ break;
if (i == 0)
delta = d / brw->vb.current_buffers[i].stride;
if (delta * brw->vb.current_buffers[i].stride != d)
--
1.7.5.3
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