glsl/linker: Fix unmatched TCS outputs being reduced to local variable

Always match TCS outputs since they are shared by all invocations
within the patch and should not be converted to local variables.

This is one of the issues found in Downward.

Signed-off-by: Danylo Piliaiev <danylo.piliaiev@globallogic.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104297

diff --git a/src/compiler/glsl/linker.cpp b/src/compiler/glsl/linker.cpp
index 08e9fb7..d9b9f60 100644 (file)
--- a/src/compiler/glsl/linker.cpp
+++ b/src/compiler/glsl/linker.cpp
@@ -3185,6 +3185,12 @@ match_explicit_outputs_to_inputs(gl_linked_shader *producer,
          const unsigned idx = var->data.location - VARYING_SLOT_VAR0;
          if (explicit_locations[idx][var->data.location_frac] == NULL)
             explicit_locations[idx][var->data.location_frac] = var;
+
+         /* Always match TCS outputs. They are shared by all invocations
+          * within a patch and can be used as shared memory.
+          */
+         if (producer->Stage == MESA_SHADER_TESS_CTRL)
+            var->data.is_unmatched_generic_inout = 0;
       }
    }