gen_bindings.sh

#!/bin/bash
set -eoux pipefail

# Usage example: `./gen_bindings.sh src/sys/pregenerated.rs`
OUTPUT_PATH="$1"

# Need to disable all these lints or clippy will complain.
PREPEND="#![allow(unused)]
#![allow(non_upper_case_globals)]
#![allow(non_camel_case_types)]
#![allow(non_snake_case)]
#![allow(rustdoc::invalid_codeblock_attributes)]
#![allow(rustdoc::invalid_rust_codeblocks)]
#![allow(rustdoc::broken_intra_doc_links)]"

HEADER_PATH="./glfw/include/GLFW/glfw3.h"
if [ ! -f $HEADER_PATH ]; then
    echo "cannot find $HEADER_PATH"
fi
# GLFW_INCLUDE_VULKAN to vulkan convenience functions. requires vulkan headers.
CLANG_ARGS="-DGLFW_INCLUDE_VULKAN -DGLFW_INCLUDE_NONE"

# append vulkan include path, if VULKAN_SDK is set. ${VAR_IF_EXISTS:+EXPAND_TO_THIS}
CLANG_ARGS="$CLANG_ARGS ${VULKAN_SDK:+-I${VULKAN_SDK}/include}"

# irrelevant because we don't pre-generate bindings for glfw3native.h
# https://github.com/rust-lang/rust-bindgen/issues/1226#issuecomment-565029052
# on mac, for glfw3native.h, add frameworks path for bindgen to correctly find ApplicationServices.h
# case "$OSTYPE" in
#   darwin*)  CLANG_ARGS="$CLANG_ARGS -F/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/" ;;
#   *)         ;;
# esac


# merge-extern-blocks to keep bindings together.
# signed macro-constant-type, as the default is to use u32, but glfw uses i32 for its API. 
# allowlist-file to only include what we actually need (skip most items from other headers like vulkan)
# no-layout-tests to avoid erroring on platforms with different pointer width (eg: wasm32-unknown-emscripten).
bindgen --merge-extern-blocks --default-macro-constant-type signed --no-layout-tests --raw-line="$PREPEND" --allowlist-file=".*glfw3\.h" -o "$OUTPUT_PATH" "$HEADER_PATH" -- $CLANG_ARGS