r600g, radeonsi: fix primitives-generated query with disabled streamout

Buffers are disabled by VGT_STRMOUT_BUFFER_CONFIG, but the query only works
if VGT_STRMOUT_CONFIG.STREAMOUT_0_EN is enabled.

This moves VGT_STRMOUT_CONFIG to its own state. The register is set to 1
if either streamout or the primitives-generated query is enabled.

However, the primitives-emitted query is also incremented, so it's disabled
by setting VGT_STRMOUT_BUFFER_SIZE to 0 when there is no buffer bound.

This fixes piglit:
  ARB_transform_feedback2/counting with pause
  EXT_transform_feedback/primgen-query transform-feedback-disabled

Reviewed-by: Michel Dänzer <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gallium/drivers/radeonsi/si_pipe.h b/src/gallium/drivers/radeonsi/si_pipe.h
index e8aa13e2df8..47dc8e754ee 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.h
+++ b/src/gallium/drivers/radeonsi/si_pipe.h
@@ -108,6 +108,7 @@ struct si_context {
 			 * updated in memory. */
 			struct r600_atom *cache_flush;
 			struct r600_atom *streamout_begin;
+			struct r600_atom *streamout_enable; /* must be after streamout_begin */
 			struct r600_atom *framebuffer;
 		};
 		struct r600_atom *array[0];