readme: add osx build instructions

README.md

@@ -35,7 +35,7 @@ There are minor graphics- and gameplay-related issues, and possibly occasional c
   * in practice the game will have issues running faster than ~165 FPS, so use VSync or `Video.FramerateLimit` to cap it.
 * emulate the Transfer Pak functionality the game has on the Nintendo 64 to unlock some cheats automatically.
 
-The following platforms are officially supported and tested:
+**The following platforms are officially supported and tested:**
 * Windows 7+: i686, x86_64
 * Linux: i686, x86_64
 * MacOS: x86_64 (OS 10.9+), arm64 (OS 11.0+)
@@ -136,6 +136,32 @@ Controls can be rebound in `pd.ini`. Default control scheme is as follows:
 4. Run `cmake --build build -j4`.
 5. The resulting executable will be at `build/pd.<arch>` (for example `build/pd.x86_64`).
 
+### MacOS
+
+1. Set up Homebrew.
+2. Install dependencies:
+   * Execute command: `brew install cmake gcc python3 zlib git`
+3. Install SDL2:
+   * Execute commands:
+     ```
+     wget http://libsdl.org/release/SDL2-2.30.9.dmg -O SDL2.dmg
+     hdiutil mount SDL2.dmg
+     sudo cp -vr /Volumes/SDL2/SDL2.framework /Library/Frameworks
+     hdiutil detach /Volumes/SDL2
+     ```
+   * This installs SDL2 system-wide and this is how the automatic builds are done. The game will also look for it in the executable path, so you could
+     download it locally instead.
+4. Get the source code:  
+   `git clone --recursive https://github.com/fgsfdsfgs/perfect_dark.git && cd perfect_dark`
+5. Configure:
+   * Execute command: `cmake -G"Unix Makefiles" -Bbuild -DCMAKE_OSX_ARCHITECTURES=x86_64 .`
+   * Replace `x86_64` with `arm64` if building for an ARM64 Mac.
+   * Add ` -DROMID=pal-final` or ` -DROMID=jpn-final` at the end of the command if you want to build a PAL or JPN executable respectively.
+6. Build:
+   * Execute command: `cmake --build build --target pd -j4 --clean-first`
+7. The resulting executable will be at `build/pd.<arch>` (for example `build/pd.x86_64`).
+   * You might need to execute `chmod +x build/pd.x86-64` before you can run it.
+
 ### Nintendo Switch
 
 1. Set up the [devkitA64 environment](https://devkitpro.org/wiki/Getting_Started).
@@ -151,15 +177,17 @@ Controls can be rebound in `pd.ini`. Default control scheme is as follows:
      dkp-pacman -S devkitA64 libnx switch-zlib switch-sdl2 switch-cmake dkp-toolchain-vars
      ```
    * If in MSYS2 or `dkp-pacman` doesn't work, replace it with just `pacman`.
-4. Ensure devkitA64 environment variables are set:
+4. Get the source code:  
+   `git clone --recursive https://github.com/fgsfdsfgs/perfect_dark.git && cd perfect_dark`
+5. Ensure devkitA64 environment variables are set:
    * Execute command: `source /opt/devkitpro/switchvars.sh`
    * If your `$DEVKITPRO` path is different, substitute that instead or set the variables manually.
-5. Configure:
+6. Configure:
    * Execute command: `aarch64-none-elf-cmake -G"Unix Makefiles" -Bbuild .`
    * Add ` -DROMID=pal-final` or ` -DROMID=jpn-final` at the end of the command if you want to build a PAL or JPN executable respectively.
-6. Build:
+7. Build:
    * Execute command: `make -C build -j4`
-7. The resulting executable will be at `build/pd.arm64.nro`.
+8. The resulting executable will be at `build/pd.arm64.nro`.
 
 ### Notes