From ef62f0bb3c6f02e194ec35c36e922ae9210ad81a Mon Sep 17 00:00:00 2001
From: Taylor Richards <taylor@notimaginative.com>
Date: Tue, 7 Jul 2026 14:15:15 -0400
Subject: [PATCH] add macOS support

---
 README.md                 |  7 ++++
 build_etc2native_macos.sh | 75 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 82 insertions(+)
 create mode 100644 build_etc2native_macos.sh

diff --git a/README.md b/README.md
index ebe07ad..7445e02 100644
--- a/README.md
+++ b/README.md
@@ -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
@@ -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
diff --git a/build_etc2native_macos.sh b/build_etc2native_macos.sh
new file mode 100644
index 0000000..6d6c10d
--- /dev/null
+++ b/build_etc2native_macos.sh
@@ -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'