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, 6 insertions, 6 deletions

diff --git a/src/gallium/drivers/llvmpipe/lp_state_so.c b/src/gallium/drivers/llvmpipe/lp_state_so.c
index fa58f79c9c1..2af04cdf1c3 100644
--- a/src/gallium/drivers/llvmpipe/lp_state_so.c
+++ b/src/gallium/drivers/llvmpipe/lp_state_so.c
@@ -64,17 +64,17 @@ static void
 llvmpipe_set_so_targets(struct pipe_context *pipe,
                         unsigned num_targets,
                         struct pipe_stream_output_target **targets,
-                        unsigned append_bitmask)
+                        const unsigned *offsets)
 {
    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
    int i;
    for (i = 0; i < num_targets; i++) {
+      const boolean append = (offsets[i] == (unsigned)-1);
       pipe_so_target_reference((struct pipe_stream_output_target **)&llvmpipe->so_targets[i], targets[i]);
-      /* if we're not appending then lets reset the internal
-         data of our so target */
-      if (!(append_bitmask & (1 << i)) && llvmpipe->so_targets[i]) {
-         llvmpipe->so_targets[i]->internal_offset = 0;
-         llvmpipe->so_targets[i]->emitted_vertices = 0;
+      /* If we're not appending then lets set the internal
+         offset to what was requested */
+      if (!append && llvmpipe->so_targets[i]) {
+         llvmpipe->so_targets[i]->internal_offset = offsets[i];
       }
    }