nouveau: Add initial headers and meson for the new compoiler

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24998>

src/nouveau/compiler/meson.build

@@ -0,0 +1,22 @@
+libnak_c_files = files(
+  'nak.h',
+)
+
+libnak_deps = [
+  idep_mesautil,
+  idep_nir_headers,
+]
+
+_libnak = static_library(
+  'nak',
+  libnak_c_files,
+  include_directories : [inc_include, inc_src, inc_mapi, inc_mesa, inc_gallium],
+  dependencies : libnak_deps,
+  c_args : [no_override_init_args],
+  gnu_symbol_visibility : 'hidden',
+)
+
+idep_nak = declare_dependency(
+  include_directories : include_directories('.'),
+  link_with : _libnak,
+)

src/nouveau/compiler/nak.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright © 2022 Collabora, Ltd.
+ * SPDX-License-Identifier: MIT
+ */
+
+#ifndef NAK_H
+#define NAK_H
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct nir_shader_compiler_options;
+typedef struct nir_shader nir_shader;
+
+struct nak_compiler {
+};
+
+void nak_optimize_nir(nir_shader *nir, const struct nak_compiler *nak);
+void nak_preprocess_nir(nir_shader *nir, const struct nak_compiler *nak);
+void nak_postprocess_nir(nir_shader *nir, const struct nak_compiler *nak);
+
+struct nak_shader_info {
+   /** Number of GPRs used */
+   uint8_t num_gprs;
+
+   /** Size of thread-local storage */
+   uint32_t tls_size;
+
+   struct {
+      /* Local workgroup size */
+      uint16_t local_size[3];
+
+      /* Shared memory size */
+      uint16_t smem_size;
+   } cs;
+
+   /** Shader header for 3D stages */
+   uint32_t hdr[32];
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NAK_H */

src/nouveau/meson.build

@@ -19,7 +19,9 @@
 # SOFTWARE.
 
 subdir('nvidia-headers')
-subdir('compiler')
+if with_nouveau_vk
+  subdir('compiler')
+endif
 subdir('winsys')
 if with_tools.contains('drm-shim')
   subdir('drm-shim')