gallium: allow setting of the internal stream output offset

D3D10 allows setting of the internal offset of a buffer, which is
in general only incremented via actual stream output writes. By
allowing setting of the internal offset draw_auto is capable
of rendering from buffers which have not been actually streamed
out to. Our interface didn't allow. This change functionally
shouldn't make any difference to OpenGL where instead of an
append_bitmask you just get a real array where -1 means append
(like in D3D) and 0 means do not append.

Signed-off-by: Zack Rusin <[email protected]>
Reviewed-by: Roland Scheidegger <[email protected]>
Reviewed-by: Jose Fonseca <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>

1 files changed, 4 insertions, 3 deletions

diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_state.c b/src/gallium/drivers/nouveau/nvc0/nvc0_state.c
index dec535532d8..88dbaa1113e 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_state.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_state.c
@@ -1031,7 +1031,7 @@ static void
 nvc0_set_transform_feedback_targets(struct pipe_context *pipe,
                                     unsigned num_targets,
                                     struct pipe_stream_output_target **targets,
-                                    unsigned append_mask)
+                                    unsigned *offsets)
 {
    struct nvc0_context *nvc0 = nvc0_context(pipe);
    unsigned i;
@@ -1040,14 +1040,15 @@ nvc0_set_transform_feedback_targets(struct pipe_context *pipe,
    assert(num_targets <= 4);
 
    for (i = 0; i < num_targets; ++i) {
-      if (nvc0->tfbbuf[i] == targets[i] && (append_mask & (1 << i)))
+      boolean append = (offsets[i] == ((unsigned)-1));
+      if (nvc0->tfbbuf[i] == targets[i] && append)
          continue;
       nvc0->tfbbuf_dirty |= 1 << i;
 
       if (nvc0->tfbbuf[i] && nvc0->tfbbuf[i] != targets[i])
          nvc0_so_target_save_offset(pipe, nvc0->tfbbuf[i], i, &serialize);
 
-      if (targets[i] && !(append_mask & (1 << i)))
+      if (targets[i] && !append)
          nvc0_so_target(targets[i])->clean = TRUE;
 
       pipe_so_target_reference(&nvc0->tfbbuf[i], targets[i]);