If we capture transform feedback from n stream in (n-1) buffers we face a
NULL buffer, use the buffer (n-1) to capture the output of stream n.
This fixes one piglit test with nvc0:
arb_gpu_shader5-xfb-streams-without-invocations
Signed-off-by: Tobias Klausmann <tobias.johannes.klausm...@mni.thm.de>
---
src/mesa/state_tracker/st_cb_xformfb.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/src/mesa/state_tracker/st_cb_xformfb.c
b/src/mesa/state_tracker/st_cb_xformfb.c
index 8f75eda..5a12da4 100644
--- a/src/mesa/state_tracker/st_cb_xformfb.c
+++ b/src/mesa/state_tracker/st_cb_xformfb.c
@@ -123,6 +123,11 @@ st_begin_transform_feedback(struct gl_context *ctx, GLenum
mode,
struct st_buffer_object *bo = st_buffer_object(sobj->base.Buffers[i]);
if (bo) {
+ if (!bo->buffer)
+ /* If we capture transform feedback from n streams into (n-1)
+ * buffers we have to write to buffer (n-1) for stream n.
+ */
+ bo = st_buffer_object(sobj->base.Buffers[i-1]);
/* Check whether we need to recreate the target. */
if (!sobj->targets[i] ||
sobj->targets[i] == sobj->draw_count ||
--
2.2.1
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