[Mesa-dev] [PATCH] r600: Only set context streamout strides info from the shader that has outputs

[Gert Wollny]

From: Gert Wollny <gert.wollny at collabora.com>

With 5d517a streamout info is only attached to the shader for which the 
transform feedback is actually recorded, but the driver set the context info 
with each state submitted, thereby always using the info data that was 
attached to the vertex shader.

Pass the streamout stride info to the context only from the shader that 
actually has outputs. (Thanks to Marek Olšák for pointing me in the right 
direction) 

Fixes regresion with: dEQP-GLES31.functional.tessellation.invariance.*
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108734
Fixes: 5d517a599b1eabd1d5696bf31e26f16568d35770
  st/mesa: Don't record garbage streamout information in the non-SSO case.

Signed-off-by: Gert Wollny <gert.wollny at collabora.com>
---
 src/gallium/drivers/r600/r600_state_common.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/gallium/drivers/r600/r600_state_common.c b/src/gallium/drivers/r600/r600_state_common.c
index 2d36541787..f886a27170 100644
--- a/src/gallium/drivers/r600/r600_state_common.c
+++ b/src/gallium/drivers/r600/r600_state_common.c
@@ -1020,7 +1020,9 @@ static void r600_bind_vs_state(struct pipe_context *ctx, void *state)
 
 	rctx->vs_shader = (struct r600_pipe_shader_selector *)state;
 	r600_update_vs_writes_viewport_index(&rctx->b, r600_get_vs_info(rctx));
-	rctx->b.streamout.stride_in_dw = rctx->vs_shader->so.stride;
+
+        if (rctx->vs_shader->so.num_outputs)
+           rctx->b.streamout.stride_in_dw = rctx->vs_shader->so.stride;
 }
 
 static void r600_bind_gs_state(struct pipe_context *ctx, void *state)
@@ -1035,7 +1037,9 @@ static void r600_bind_gs_state(struct pipe_context *ctx, void *state)
 
 	if (!state)
 		return;
-	rctx->b.streamout.stride_in_dw = rctx->gs_shader->so.stride;
+
+        if (rctx->gs_shader->so.num_outputs)
+           rctx->b.streamout.stride_in_dw = rctx->gs_shader->so.stride;
 }
 
 static void r600_bind_tcs_state(struct pipe_context *ctx, void *state)
@@ -1057,7 +1061,9 @@ static void r600_bind_tes_state(struct pipe_context *ctx, void *state)
 
 	if (!state)
 		return;
-	rctx->b.streamout.stride_in_dw = rctx->tes_shader->so.stride;
+
+        if (rctx->tes_shader->so.num_outputs)
+           rctx->b.streamout.stride_in_dw = rctx->tes_shader->so.stride;
 }
 
 void r600_delete_shader_selector(struct pipe_context *ctx,
-- 
2.18.1