Add devshell for nix under macOs

.envrc

@@ -0,0 +1,5 @@
+if ! has nix_direnv_version || ! nix_direnv_version 3.0.6; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.6/direnvrc" "sha256-RYcUJaRMf8oF5LznDrlCXbkOQrywm0HDv1VjYGaJGdM="
+fi
+
+use flake . --impure

CMakeLists.txt

@@ -21,6 +21,12 @@ option ( ENABLE_CLANG_ANALYSIS "When building with clang, enable the static anal
 option ( CHECK_CCACHE "Check if ccache is installed and use it" OFF )
 set ( MSVC_WARNING_LEVEL 3 CACHE STRING "Visual Studio warning levels" )
 option ( FORCE_INSTALL_DATA_TO_BIN "Force installation of data to binary directory" OFF )
+if ( APPLE )
+  # Use by default since brew doesn't have legacy SDL1, sdl12-compat avalaible
+  option ( USE_SDL2 "Using SDL2 via SDL12 compatible layer" ON )
+else ()
+  option ( USE_SDL2 "Using SDL2 via SDL12 compatible layer" OFF )
+endif ()
 set ( DATADIR "" CACHE STRING "Where to search for datafiles" )
 
 if ( CHECK_CCACHE )
@@ -91,17 +97,30 @@ if(NOT UNIX AND IS_DIRECTORY ${DEPS_DIR})
    else ( )
      link_directories ( ${DEPS_DIR}/lib/Win32 )
    endif()
-   set( SDL_LIBRARY SDL )
+   set ( SDL_LIBRARY SDL )
+   if ( USE_SDL2 )
+     # explicitly added SDL2 as dependency since needed for runtime work
+     set ( SDL2_LIBRARY SDL2 )
+     message ( STATUS "Using SDL2 via SDL12 compatible layer" )
+   else ( )
+     set ( SDL2_LIBRARY "")
+   endif ()
    set ( SDLGFX_LIBRARY SDL_gfx )
    set ( SDLMIXER_LIBRARY SDL_mixer )
    set ( SDLIMAGE_LIBRARY SDL_image )
-   set ( PKG_DEPS_LDFLAGS ${SDLIMAGE_LIBRARY} ${SDLMIXER_LIBRARY} ${SDLGFX_LIBRARY} ${SDL_LIBRARY} ${OPENGL_LIBRARIES} )
+   set ( PKG_DEPS_LDFLAGS ${SDLIMAGE_LIBRARY} ${SDLMIXER_LIBRARY} ${SDLGFX_LIBRARY} ${SDL_LIBRARY} ${SDL2_LIBRARY} ${OPENGL_LIBRARIES} )
 elseif(UNIX OR MINGW OR CYGWIN)
   if(IS_DIRECTORY ${DEPS_DIR})
      set(ENV{PKG_CONFIG_PATH} "${DEPS_DIR}/lib/pkgconfig/")
   endif()
 
   include(FindPkgConfig)
+  if ( USE_SDL2 )
+    # explicitly added SDL2 as dependency since needed for runtime work
+    pkg_check_modules(PKG_SDL2 REQUIRED sdl2)
+  else ( )
+    set ( PKG_SDLG2_LDFLAGS "" )
+  endif ()
   pkg_check_modules(PKG_SDL REQUIRED sdl)
   pkg_check_modules(PKG_ZLIB REQUIRED zlib)
   pkg_check_modules(PKG_SDLIMAGE REQUIRED SDL_image)
@@ -110,7 +129,7 @@ elseif(UNIX OR MINGW OR CYGWIN)
 
   include_directories(${PKG_SDL_INCLUDE_DIRS} ${PKG_ZLIB_INCLUDE_DIRS} ${PKG_SDLIMAGE_INCLUDE_DIRS})
   include_directories(${PKG_SDLGFX_INCLUDE_DIRS} ${PKG_SDLMIXER_INCLUDE_DIRS})
-  set(PKG_DEPS_LDFLAGS ${PKG_SDL_LDFLAGS} ${PKG_ZLIB_LDFLAGS} ${PKG_SDLIMAGE_LDFLAGS} ${PKG_SDLGFX_LDFLAGS} ${PKG_SDLMIXER_LDFLAGS} ${OPENGL_LIBRARIES})
+  set(PKG_DEPS_LDFLAGS ${PKG_SDL_LDFLAGS} ${PKG_SDL2_LDFLAGS} ${PKG_ZLIB_LDFLAGS} ${PKG_SDLIMAGE_LDFLAGS} ${PKG_SDLGFX_LDFLAGS} ${PKG_SDLMIXER_LDFLAGS} ${OPENGL_LIBRARIES})
 
   if (UNIX)
     set(PKG_DEPS_LDFLAGS "${PKG_DEPS_LDFLAGS};dl")

README-OSX.md

@@ -1,6 +1,8 @@
 # Building for MacOS
 
-## Dependencies
+## Using brew
+
+### Dependencies
 To successfully build an OpenXcom OSX bundle you will need to ensure all the relevant dependencies installed in /usr/local/.
 
 The dependencies you require are following:
@@ -16,6 +18,17 @@ $ brew install cmake sdl sdl_gfx sdl_image sdl_mixer --with-flac --with-libmikmo
 ```
 This should install all of these necessary dependencies to their appropriate place under /usr/local.
 
+
+## Using Nix
+
+All needed stuff related to installing and configure shell already described at flake.nix, just execute
+
+```
+$ nix develop -c $SHELL
+```
+
+Note: After it all below building command are applicable
+
 ## Building
 This project has two ways to build: one with make and the other with Xcode.  The make way is typically used for CI builds and produces a similar artifact as the Linux build.  If you're just looking to get a quick build, this is a good way to do so.  The Xcode way is useful if you're developing features (or bug fixes) and require the need for a debugger or an IDE experience.
 

flake.nix

@@ -0,0 +1,83 @@
+{
+  inputs = {
+    systems.url = "github:nix-systems/default";
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      systems,
+    }:
+    let
+      forEachSystem =
+        f: nixpkgs.lib.genAttrs (import systems) (system: f { pkgs = import nixpkgs { inherit system; }; });
+    in
+    {
+      devShells = forEachSystem (
+        { pkgs }:
+        {
+          default =
+            pkgs.mkShell.override
+              {
+                # override clang 16 runtime
+                stdenv = pkgs.lowPrio pkgs.llvmPackages_16.stdenv;
+              }
+              {
+                propagatedBuildInputs = [
+                  pkgs.SDL_compat
+                  pkgs.SDL_image
+                  pkgs.libwebp
+                ];
+
+                buildInputs = with pkgs; [
+                  git
+                  pkg-config
+                  apple-sdk_15
+
+                  # Need to use brew cmake since nix use old one 3.30.5
+                  # which has issues with copy libraries to macOs app
+                  cmake
+                  # use clang explicitly since don't use cmake
+                  clang_16
+                  # OpenXcom dependecies
+                  rapidyaml
+                  zlib
+                  #SDL_mixer
+                  # SDL_image
+                  # SDL_gfx
+                  # Try to build using SDL12_compat
+                  (SDL_compat.overrideAttrs (old: {
+                    postInstall = ''
+                      ln -s $out/lib/pkgconfig/sdl12_compat.pc $out/lib/pkgconfig/sdl.pc
+                    '';
+                  }))
+                  (SDL_mixer.override (old: {
+                    SDL = SDL_compat;
+                    smpeg = old.smpeg.override {
+                      SDL = SDL_compat;
+                    };
+                  }))
+                  (SDL_gfx.override (old: {
+                    SDL = SDL_compat;
+                  }))
+                  (
+                    (SDL_image.override (old: {
+                      SDL = SDL_compat;
+                    })).overrideAttrs
+                    (old: {
+                      propagatedBuildInputs = [ SDL_compat ];
+                      src = pkgs.fetchurl {
+                        url = "https://github.com/libsdl-org/SDL_image/archive/refs/heads/SDL-1.2.tar.gz";
+                        hash = "sha256-ytt87YL2zrvLun7bi5Jd4m5N7/UR09Y3I1kRDAqf6nQ=";
+                      };
+                      patches = [ ];
+                    })
+                  )
+                ];
+              };
+        }
+      );
+    };
+}