[PATCH v6 4/5] vkd3d-shader/spirv: Make output varyings not consumed by the next stage private variables.

[Zebediah Figura]

From: Zebediah Figura

---
 libs/vkd3d-shader/ir.c                   | 3 +--
 libs/vkd3d-shader/spirv.c                | 6 ++++++
 libs/vkd3d-shader/vkd3d_shader_private.h | 5 ++++-
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/libs/vkd3d-shader/ir.c b/libs/vkd3d-shader/ir.c
index 2af01403..baec2631 100644
--- a/libs/vkd3d-shader/ir.c
+++ b/libs/vkd3d-shader/ir.c
@@ -138,8 +138,7 @@ static enum vkd3d_result remap_output_signature(struct shader_signature *signatu
         }
         else
         {
-            FIXME("This stage outputs varyings not consumed by the next stage.\n");
-            return VKD3D_ERROR_NOT_IMPLEMENTED;
+            e->target_location = SIGNATURE_TARGET_LOCATION_UNUSED;
         }
     }

diff --git a/libs/vkd3d-shader/spirv.c b/libs/vkd3d-shader/spirv.c
index 28825256..2725ed80 100644
--- a/libs/vkd3d-shader/spirv.c
+++ b/libs/vkd3d-shader/spirv.c
@@ -4978,6 +4978,12 @@ static void spirv_compiler_emit_output(struct spirv_compiler *compiler,

spirv_compiler_emit_register_execution_mode(compiler, &dst->reg);
     }
+    else if (signature_element->target_location == SIGNATURE_TARGET_LOCATION_UNUSED)
+    {
+        storage_class = SpvStorageClassPrivate;
+        id = spirv_compiler_emit_array_variable(compiler, &builder->global_stream,
+                storage_class, component_type, output_component_count, array_sizes, 2);
+    }
     else
     {
         unsigned int location = signature_element->target_location;
diff --git a/libs/vkd3d-shader/vkd3d_shader_private.h b/libs/vkd3d-shader/vkd3d_shader_private.h
index ed344332..9ebb2a92 100644
--- a/libs/vkd3d-shader/vkd3d_shader_private.h
+++ b/libs/vkd3d-shader/vkd3d_shader_private.h
@@ -807,6 +807,8 @@ enum vkd3d_shader_input_sysval_semantic
     VKD3D_SIV_LINE_DENSITY_TESS_FACTOR     = 22,
 };

+#define SIGNATURE_TARGET_LOCATION_UNUSED (~0u)
+
 struct signature_element
 {
     unsigned int sort_index;
@@ -821,7 +823,8 @@ struct signature_element
     unsigned int mask;
     unsigned int used_mask;
     enum vkd3d_shader_minimum_precision min_precision;
-    /* Register index / location in the target shader. */
+    /* Register index / location in the target shader.
+     * If SIGNATURE_TARGET_LOCATION_UNUSED, this element should not be written. */
     unsigned int target_location;
 };