zink: emit blend-target index

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3689>

3 files changed, 11 insertions, 0 deletions

diff --git a/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c b/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
index 455bb562a47..fa2c7b0bf94 100644
--- a/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
+++ b/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
@@ -331,6 +331,7 @@ emit_output(struct ntv_context *ctx, struct nir_variable *var)
          switch (var->data.location) {
          case FRAG_RESULT_COLOR:
             spirv_builder_emit_location(&ctx->builder, var_id, 0);
+            spirv_builder_emit_index(&ctx->builder, var_id, var->data.index);
             break;
 
          case FRAG_RESULT_DEPTH:
diff --git a/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.c b/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.c
index bdb8b8a1179..9fb447611f3 100644
--- a/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.c
+++ b/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.c
@@ -222,6 +222,13 @@ spirv_builder_emit_array_stride(struct spirv_builder *b, SpvId target,
    emit_decoration(b, target, SpvDecorationArrayStride, args, ARRAY_SIZE(args));
 }
 
+void
+spirv_builder_emit_index(struct spirv_builder *b, SpvId target, int index)
+{
+   uint32_t args[] = { index };
+   emit_decoration(b, target, SpvDecorationIndex, args, ARRAY_SIZE(args));
+}
+
 static void
 emit_member_decoration(struct spirv_builder *b, SpvId target, uint32_t member,
                        SpvDecoration decoration, const uint32_t extra_operands[],
diff --git a/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.h b/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.h
index bd19e74822c..d0843b8ff79 100644
--- a/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.h
+++ b/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.h
@@ -94,6 +94,9 @@ spirv_builder_emit_builtin(struct spirv_builder *b, SpvId target,
                            SpvBuiltIn builtin);
 
 void
+spirv_builder_emit_index(struct spirv_builder *b, SpvId target, int index);
+
+void
 spirv_builder_emit_descriptor_set(struct spirv_builder *b, SpvId target,
                                   uint32_t descriptor_set);