rutabaga_gfx/ffi: add meson build

This is somewhat more modern than the Makefile.  Both just invoke
cargo under the hood.  The proper solution may come when Meson
starts supporting external crates:

mesonbuild/meson#2173

Right now, this is a just a minimal version for developers.  A known
issue is modifying dependent crates (rutabaga_gfx) doesn't cause
a rebuild.  A solution is just `touch src/lib.rs` in ffi.

Also, `ninja -C build/ clean` isn't recommended.  Just do cargo
clean.

BUG=344998548
TEST=meson setup build
     ninja -C build/ install

Change-Id: Id5a142cc5cb5a8001198afc4d1cdbe800ec2ec23
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/5599139
Reviewed-by: Daniel Verkamp <[email protected]>
Commit-Queue: Gurchetan Singh <[email protected]>

rutabaga_gfx/ffi/meson.build

@@ -0,0 +1,46 @@
+# Copyright 2024 The ChromiumOS Authors
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+project('rutabaga_gfx_ffi', ['rust', 'c'],
+         version: '0.1.3')
+
+target_os = host_machine.system()
+
+# By default cargo would generate rutabaga_gfx_ffi.dll (without the lib
+# prefix) for a Windows cdylib
+if target_os == 'windows'
+  shared_lib = 'rutabaga_gfx_ffi.dll'
+endif
+if target_os == 'darwin'
+  shared_lib = 'librutabaga_gfx_ffi.dylib'
+endif
+if target_os == 'linux'
+  shared_lib = 'librutabaga_gfx_ffi.so'
+endif
+
+cargo = find_program('cargo')
+cmd = [cargo, 'build']
+with_gfxstream = get_option('gfxstream')
+if with_gfxstream
+  cmd += '--features=gfxstream'
+endif
+
+rutabaga_gfx_ffi_ct = custom_target(
+  'rutabaga_gfx_ffi_build',
+  output: shared_lib,
+  input: ['src/lib.rs', 'Cargo.toml', 'build.rs'],
+  command: cmd,
+)
+
+rutabaga_gfx_ffi_h = files('src/include/rutabaga_gfx_ffi.h')
+
+rutabaga_gfx_ffi = library(
+  'rutabaga_gfx_ffi',
+  sources: [rutabaga_gfx_ffi_h, rutabaga_gfx_ffi_ct],
+  version: '0.1.3',
+  install: true,
+)
+
+install_headers(rutabaga_gfx_ffi_h,
+                subdir: 'rutabaga_gfx')

rutabaga_gfx/ffi/meson_options.txt

@@ -0,0 +1,8 @@
+# 2024 Android Open Source Project
+# SPDX-License-Identifier: MIT
+option(
+  'gfxstream',
+  type : 'boolean',
+  value : false,
+  description : 'Build gfxstream in rutabaga_gfx_ffi',
+)