[Mesa-dev] [PATCH 03/13] nir: do not remove varyings used for transform feedback

[Jason Ekstrand]

From: Samuel Pitoiset <samuel.pitoiset at gmail.com>

When a xfb buffer is explicitely declared on a varying
variable, we shouldn't remove it at link time.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
---
 src/compiler/nir/nir_linking_helpers.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/compiler/nir/nir_linking_helpers.c b/src/compiler/nir/nir_linking_helpers.c
index 85712a7cb1c..a710ba3da25 100644
--- a/src/compiler/nir/nir_linking_helpers.c
+++ b/src/compiler/nir/nir_linking_helpers.c
@@ -112,6 +112,9 @@ remove_unused_io_vars(nir_shader *shader, struct exec_list *var_list,
       if (var->data.always_active_io)
          continue;
 
+      if (var->data.explicit_xfb_buffer)
+         continue;
+
       uint64_t other_stage = used[var->data.location_frac];
 
       if (!(other_stage & get_variable_io_mask(var, shader->info.stage))) {
-- 
2.19.1