[Mesa-dev] [PATCH 05/18] glsl: Fail to link if inter-stage input/outputs are not assigned to stream 0

[Iago Toral Quiroga]

Outputs that are linked to inputs in the next stage must be output to stream 0,
otherwise we should fail to link.
---
 src/glsl/link_varyings.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/glsl/link_varyings.cpp b/src/glsl/link_varyings.cpp
index 9883c0b..0066b4e 100644
--- a/src/glsl/link_varyings.cpp
+++ b/src/glsl/link_varyings.cpp
@@ -1343,6 +1343,13 @@ assign_varying_locations(struct gl_context *ctx,
           * consumer stage, add the output.
           */
          if (input_var || (prog->SeparateShader && consumer == NULL)) {
+            /* Only stream 0 outputs can be consumed in the next stage */
+            if (input_var && output_var->data.streamId != 0) {
+               linker_error(prog, "output %s is assigned to stream=%d but "
+                            "is linked to an input, which requires stream=0",
+                            output_var->name, output_var->data.streamId);
+               return false;
+            }
             matches.record(output_var, input_var);
          }
       }
-- 
1.9.1