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add macOS support #1

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7 changes: 7 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ etc2native/
build_etc2native_windows.cmd <- Windows x64 / x86 / arm64
build_etc2native_linux.sh <- Linux x64 / arm64 / riscv64
build_etc2native_android.sh <- Android arm64-v8a / armeabi-v7a / x86 / x86_64
build_etc2native_macos.sh <- macOS Universal (arm64 + x64)
Dockerfile.etc2native-linux
Dockerfile.etc2native-android
compose.etc2native.yaml
Expand Down Expand Up @@ -47,6 +48,12 @@ docker compose -f compose.etc2native.yaml run --rm etc2native-linux
# -> prebuilt_linux_etc2native/{x64,arm64,riscv64}/libetc2native.so
```

## macOS
```
sh ./build_etc2native_macos.sh
:: -> prebuilt_macos_etc2native/universal/libetc2native.dylib
```

## Android (Docker)
```
docker compose -f compose.etc2native.yaml run --rm etc2native-android
Expand Down
75 changes: 75 additions & 0 deletions build_etc2native_macos.sh
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@@ -0,0 +1,75 @@
#!/bin/sh
# Builds libetc2native.dylib for macOS: Apple Silicon + x86_64.
#
# etc2comp is pure C++ (no x86 intrinsics), so cross-compiling needs nothing
# special.
#
# Outputs (loose .so per arch):
# prebuilt_macos_etc2native/libetc2native.dylib

SCRIPT_DIR=$(CDPATH= cd -- "$(dirname -- '$0')" && pwd)

ETC2_SRC="$SCRIPT_DIR/etc2native" # project: CMakeLists.txt + EtcCApi.cpp/.h
ETC2_FORK="${ETC2_FORK:-https://github.com/Shivansps/etc2comp.git}"
ETC2_REF="${ETC2_REF:-master}"
TARGET_PREBUILT_FOLDER="$SCRIPT_DIR/prebuilt_macos_etc2native"
TEMP_FOLDER="$TARGET_PREBUILT_FOLDER/etc2_temp"

if [ ! -f "$ETC2_SRC/CMakeLists.txt" ]; then
echo "Error: expected the etc2native project at $ETC2_SRC (CMakeLists.txt, EtcCApi.cpp/.h)." >&2
exit 1
fi

rm -rf "$TARGET_PREBUILT_FOLDER" && mkdir -p "$TARGET_PREBUILT_FOLDER" && mkdir -p "$TEMP_FOLDER"

#############################################################################
# --- Get etc2comp fork source ----------------------------------------------
#############################################################################
ETC2_DIR="$TEMP_FOLDER/etc2comp"
echo "Cloning etc2comp fork (ref: $ETC2_REF) ..."
git clone --depth 1 --branch "$ETC2_REF" "$ETC2_FORK" "$ETC2_DIR" \
|| git clone "$ETC2_FORK" "$ETC2_DIR"


#############################################################################
# Build helper: configures+builds libetc2native.
#############################################################################
build() {
label="universal"
build_dir="$TEMP_FOLDER/build-$label"

echo ""
echo "=== Building libetc2native for macOS ==="

# shellcheck disable=SC2086
cmake -S "$ETC2_SRC" -B "$build_dir" -G Ninja \
-DCMAKE_OSX_ARCHITECTURES="x86_64;arm64" \
-DCMAKE_OSX_DEPLOYMENT_TARGET="11.0" \
-DCMAKE_BUILD_TYPE=Release \
-DETC2_ROOT="$ETC2_DIR"
cmake --build "$build_dir"

out_dir="$TARGET_PREBUILT_FOLDER/$label"
mkdir -p "$out_dir"
cp "$build_dir"/libetc2native.dylib "$out_dir"/ 2>/dev/null

if [ ! -f "$out_dir/libetc2native.dylib" ]; then
echo "Error: libetc2native.dylib was not produced" >&2
exit 1
fi

codesign --force --timestamp --deep --sign - "$out_dir/libetc2native.dylib" 2>/dev/null

echo "-> $out_dir/libetc2native.dylib"
}

build

#############################################################################
# Cleanup (keep the per-arch .so folders)
#############################################################################
rm -rf "$TEMP_FOLDER"

echo ""
echo "Done. Output in $TARGET_PREBUILT_FOLDER:"
find "$TARGET_PREBUILT_FOLDER" -name '*.dylib'