From 665d81017a795eaa18cbaa6a06d1c258c553bbf1 Mon Sep 17 00:00:00 2001
From: Chinmay Garde <chinmaygarde@google.com>
Date: Tue, 4 May 2021 12:21:49 -0700
Subject: [PATCH] Add build rules for inja and libtess2.

Mirrors for [inja](https://github.com/flutter/flutter/issues/94824) and [libtess2](https://github.com/flutter/flutter/issues/94823) are being setup.

Inja is a template engine used to generate headers from reflected shader information. This dependency will not be used any targets shipping as engine artifacts.

libtess2 is used for triangulation.

Impeller needs one more dependency in [sqlite3](https://github.com/flutter/flutter/issues/94773) which will only be used in debug and profile modes to capture a sequence of scenes and instrumentation information. This file can then be exported from the device and used to playback those animations for debugging and instrumentation. There are no build rules in this patch for sqlite3 because those are part of the mirrored repo itself.
---
 build/secondary/third_party/inja/BUILD.gn     | 44 +++++++++++++++++++
 build/secondary/third_party/libtess2/BUILD.gn | 26 +++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 build/secondary/third_party/inja/BUILD.gn
 create mode 100644 build/secondary/third_party/libtess2/BUILD.gn

diff --git a/build/secondary/third_party/inja/BUILD.gn b/build/secondary/third_party/inja/BUILD.gn
new file mode 100644
index 0000000000..798ed7654a
--- /dev/null
+++ b/build/secondary/third_party/inja/BUILD.gn
@@ -0,0 +1,44 @@
+# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_root = "//third_party/inja"
+
+config("inja_public_config") {
+  include_dirs = [
+    "$source_root/include",
+    "$source_root/third_party/include",
+  ]
+
+  if (is_clang) {
+    cflags_cc = [
+      "-Wno-unused-variable",
+      "-Wno-newline-eof",
+    ]
+  }
+
+  defines = [ "INJA_NOEXCEPTION=1" ]
+}
+
+source_set("inja") {
+  public_configs = [ ":inja_public_config" ]
+
+  public = [ "$source_root/include/inja/inja.hpp" ]
+
+  sources = [
+    "$source_root/include/inja/config.hpp",
+    "$source_root/include/inja/environment.hpp",
+    "$source_root/include/inja/exceptions.hpp",
+    "$source_root/include/inja/function_storage.hpp",
+    "$source_root/include/inja/inja.hpp",
+    "$source_root/include/inja/lexer.hpp",
+    "$source_root/include/inja/node.hpp",
+    "$source_root/include/inja/parser.hpp",
+    "$source_root/include/inja/renderer.hpp",
+    "$source_root/include/inja/statistics.hpp",
+    "$source_root/include/inja/string_view.hpp",
+    "$source_root/include/inja/template.hpp",
+    "$source_root/include/inja/token.hpp",
+    "$source_root/include/inja/utils.hpp",
+  ]
+}
diff --git a/build/secondary/third_party/libtess2/BUILD.gn b/build/secondary/third_party/libtess2/BUILD.gn
new file mode 100644
index 0000000000..cc4f5119b8
--- /dev/null
+++ b/build/secondary/third_party/libtess2/BUILD.gn
@@ -0,0 +1,26 @@
+# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("libtess2") {
+  public = [ "//third_party/libtess2/Include/tesselator.h" ]
+
+  include_dirs = [ "//third_party/libtess2/Include/" ]
+
+  sources = [
+    "//third_party/libtess2/Source/bucketalloc.c",
+    "//third_party/libtess2/Source/bucketalloc.h",
+    "//third_party/libtess2/Source/dict.c",
+    "//third_party/libtess2/Source/dict.h",
+    "//third_party/libtess2/Source/geom.c",
+    "//third_party/libtess2/Source/geom.h",
+    "//third_party/libtess2/Source/mesh.c",
+    "//third_party/libtess2/Source/mesh.h",
+    "//third_party/libtess2/Source/priorityq.c",
+    "//third_party/libtess2/Source/priorityq.h",
+    "//third_party/libtess2/Source/sweep.c",
+    "//third_party/libtess2/Source/sweep.h",
+    "//third_party/libtess2/Source/tess.c",
+    "//third_party/libtess2/Source/tess.h",
+  ]
+}