From: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Date: Fri, 11 May 2018 08:29:17 +0000 (+0200)
Subject: nir: do not remove varyings used for transform feedback
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9f4e0aa7c1f9d71e6716295a1ee5b78e70ed6f37;p=mesa.git

nir: do not remove varyings used for transform feedback

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@gmail.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
---

diff --git a/src/compiler/nir/nir_linking_helpers.c b/src/compiler/nir/nir_linking_helpers.c
index 8e67e84b588..aaa4204cce9 100644
--- a/src/compiler/nir/nir_linking_helpers.c
+++ b/src/compiler/nir/nir_linking_helpers.c
@@ -128,6 +128,9 @@ nir_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))) {