box2d: add build script and MacOS libraries

vendor/box2d/box2d.odin

@@ -3,16 +3,30 @@ package vendor_box2d
 import "base:intrinsics"
 import "core:c"
 
+@(private) VECTOR_EXT :: "avx2" when #config(VENDOR_BOX2D_ENABLE_AVX2, intrinsics.has_target_feature("avx2")) else "sse2"
+
 when ODIN_OS == .Windows {
-	@(private) VECTOR_EXT :: "avx2" when #config(VENDOR_BOX2D_ENABLE_AVX2, intrinsics.has_target_feature("avx2")) else "sse2"
-	@(private) LIB_PATH   :: "lib/box2d_windows_amd64_" + VECTOR_EXT + ".lib"
+	@(private) LIB_PATH :: "lib/box2d_windows_amd64_" + VECTOR_EXT + ".lib"
 
 	foreign import lib {
 		LIB_PATH,
 	}
 } else {
+	when ODIN_ARCH == .amd64 {
+		@(private) OS       :: "darwin" when ODIN_OS == .Darwin else "other"
+		@(private) LIB_PATH :: "lib/box2d_" + OS + "_amd64_" + VECTOR_EXT + ".a"
+	} else when ODIN_OS == .Darwin && ODIN_ARCH == .arm64 {
+		@(private) LIB_PATH :: "lib/box2d_darwin_arm64.a"
+	} else {
+		@(private) LIB_PATH :: "lib/box2d_other.a"
+	}
+
+	when !#exists(LIB_PATH) {
+		#panic("Could not find the compiled box2d libraries at \"" + LIB_PATH + "\", they can be compiled by running the `build.sh` script at `" + ODIN_ROOT + "vendor/box2d/build_box2d.sh\"`")
+	}
+
 	foreign import lib {
-		"box2d",
+		LIB_PATH,
 	}
 }
 

vendor/box2d/build_box2d.sh

@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+set -eu
+
+VERSION="3.0.0"
+RELEASE="https://github.com/erincatto/box2d/archive/refs/tags/v$VERSION.tar.gz"
+
+cd "$(odin root)"/vendor/box2d
+
+curl -O -L "$RELEASE"
+tar -xzvf "v$VERSION.tar.gz"
+
+cd "box2d-$VERSION"
+
+DISABLE_FLAGS="-DBOX2D_SAMPLES=OFF -DBOX2D_VALIDATE=OFF -DBOX2D_UNIT_TESTS=OFF"
+
+case "$(uname -s)" in
+Darwin)
+	export MACOSX_DEPLOYMENT_TARGET="11" 
+
+	case "$(uname -m)" in
+	"x86_64" | "amd64")
+		rm -rf build
+		mkdir build
+		cmake $DISABLE_FLAGS -DBOX2D_AVX2=ON -DCMAKE_OSX_ARCHITECTURES=x86_64 -S . -B build
+		cmake --build build
+		cp build/src/libbox2d.a ../lib/box2d_darwin_amd64_avx2.a
+
+		rm -rf build
+		mkdir build
+		cmake $DISABLE_FLAGS -DBOX2D_AVX2=OFF -DCMAKE_OSX_ARCHITECTURES=x86_64 -S . -B build
+		cmake --build build
+		cp build/src/libbox2d.a ../lib/box2d_darwin_amd64_sse2.a
+		;;
+	*)
+		rm -rf build
+		mkdir build
+		cmake $DISABLE_FLAGS -DCMAKE_OSX_ARCHITECTURES=arm64 -S . -B build
+		cmake --build build
+		cp build/src/libbox2d.a ../lib/box2d_darwin_arm64.a
+		;;
+	esac
+	;;
+*)
+	case "$(uname -m)" in
+	"x86_64" | "amd64")
+		rm -rf build
+		mkdir build
+		cmake $DISABLE_FLAGS -DBOX2D_AVX2=ON -S . -B build
+		cmake --build build
+		cp build/src/libbox2d.a ../lib/box2d_other_amd64_avx2.a
+
+		rm -rf build
+		mkdir build
+		cmake $DISABLE_FLAGS -DBOX2D_AVX2=OFF -S . -B build
+		cmake --build build
+		cp build/src/libbox2d.a ../lib/box2d_other_amd64_sse2.a
+		;;
+	*)
+		rm -rf build
+		mkdir build
+		cmake $DISABLE_FLAGS -DCMAKE_OSX_ARCHITECTURES=arm64 -S . -B build
+		cmake --build build
+		cp build/src/libbox2d.a ../lib/box2d_other.a
+		;;
+	esac
+	;;
+esac
+
+cd ..
+
+rm -rf v3.0.0.tar.gz
+rm -rf box2d-3.0.0