radeon: don't emit streamout state if there are no streamout buffers

This could happen if set_stream_output_targets is called twice
in a row without a draw call in between.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

diff --git a/src/gallium/drivers/radeon/r600_streamout.c b/src/gallium/drivers/radeon/r600_streamout.c
index 313d737..18f7d88 100644 (file)
--- a/src/gallium/drivers/radeon/r600_streamout.c
+++ b/src/gallium/drivers/radeon/r600_streamout.c
@@ -137,6 +137,8 @@ void r600_set_streamout_targets(struct pipe_context *ctx,
 
        if (num_targets) {
                r600_streamout_buffers_dirty(rctx);
+       } else {
+               rctx->streamout.begin_atom.dirty = false;
        }
 }