vc4: Don't throw out the index offset in the shadow index buffer path.

When we upload shadow indices at draw time, we need the source offset.
Fixes the piglit draw-elements test.

diff --git a/src/gallium/drivers/vc4/vc4_state.c b/src/gallium/drivers/vc4/vc4_state.c
index bbbb73d..630ac4d 100644 (file)
--- a/src/gallium/drivers/vc4/vc4_state.c
+++ b/src/gallium/drivers/vc4/vc4_state.c
@@ -300,12 +300,11 @@ vc4_set_index_buffer(struct pipe_context *pctx,
                         pipe_resource_reference(&vc4->indexbuf.buffer, NULL);
                         vc4->indexbuf.buffer = pshadow;
                         vc4->indexbuf.index_size = 2;
-                        vc4->indexbuf.offset = 0;
                 } else {
                         pipe_resource_reference(&vc4->indexbuf.buffer, ib->buffer);
                         vc4->indexbuf.index_size = ib->index_size;
-                        vc4->indexbuf.offset = ib->offset;
                 }
+                vc4->indexbuf.offset = ib->offset;
         } else {
                 pipe_resource_reference(&vc4->indexbuf.buffer, NULL);
         }