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// Copyright 2015 Brendan Zabarauskas and the gl-rs developers
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This build script is used to discover all of the accepted extensions
// described in the Khronos WebGL repository, and construct a static slice
// containing the XML specifications for all of them.
use std::env;
use std::fs::File;
use std::io::Write;
use std::path::*;
fn main() {
// Create and open a file in the output directory to contain our generated rust code
let dest = env::var("OUT_DIR").unwrap();
let mut file = File::create(&Path::new(&dest).join("webgl_exts.rs")).unwrap();
// Find the absolute path to the folder containing the WebGL extensions.
// The absolute path is needed, because we don't know where the output
// directory will be, and `include_bytes!(..)` resolves paths relative to the
// containing file.
let root = env::current_dir().unwrap().join("api_webgl/extensions");
// Generate a slice literal, looking like this:
// `&[&*include_bytes!(..), &*include_bytes!(..), ..]`
writeln!(file, "&[").unwrap();
// The slice will have one entry for each WebGL extension. To find the
// extensions we mirror the behaviour of the `api_webgl/extensions/find-exts`
// shell script.
for entry in root.read_dir().unwrap() {
let entry = entry.unwrap();
let path = entry.path();
let ext_name = path.file_name().unwrap().to_str().unwrap();
// Each item which is a directory, and is not named `template`, may be
// an extension.
if path.is_dir() && ext_name != "template" {
// If the directory contains a file named `extension.xml`, then this
// really is an extension.
let ext_path = path.join("extension.xml");
if ext_path.is_file() {
// Include the XML file, making sure to use an absolute path.
writeln!(file, "&*include_bytes!({:?}),", ext_path.to_str().unwrap()).unwrap();
}
}
}
// Close the slice
writeln!(file, "]").unwrap();
}
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