Build Pyodide wheel

Disable link flags to let Emscripten take over for SDL3

Disable Py_LIMITED_API definition to workaround issue with cffi

Related to #123

Author: HexDecimal

.github/workflows/python-package.yml

@@ -321,6 +321,30 @@ jobs:
           retention-days: 7
           compression-level: 0
 
+  pyodide:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: ${{ env.git-depth }}
+      - name: Checkout submodules
+        run: git submodule update --init --recursive --depth 1
+      - uses: libsdl-org/setup-sdl@6574e20ac65ce362cd12f9c26b3a5e4d3cd31dee
+        with:
+          install-linux-dependencies: true
+          build-type: "Debug"
+          version: ${{ env.sdl-version }}
+      - uses: pypa/cibuildwheel@v3.0.0
+        env:
+          CIBW_PLATFORM: pyodide
+      - name: Archive wheel
+        uses: actions/upload-artifact@v4
+        with:
+          name: wheels-pyodide
+          path: wheelhouse/*.whl
+          retention-days: 30
+          compression-level: 0
+
   publish:
     needs: [sdist, build, build-macos, linux-wheels]
     runs-on: ubuntu-latest

.vscode/settings.json

@@ -350,6 +350,7 @@
         "pycall",
         "pycparser",
         "pyinstaller",
+        "pyodide",
         "pypa",
         "PYPI",
         "pypiwin",

build_libtcod.py

@@ -162,7 +162,12 @@ def walk_sources(directory: str) -> Iterator[str]:
 
 libraries: list[str] = [*build_sdl.libraries]
 library_dirs: list[str] = [*build_sdl.library_dirs]
-define_macros: list[tuple[str, Any]] = [("Py_LIMITED_API", Py_LIMITED_API)]
+define_macros: list[tuple[str, Any]] = []
+
+if "PYODIDE" not in os.environ:
+    # Unable to apply Py_LIMITED_API to Pyodide in cffi<=1.17.1
+    # https://github.com/python-cffi/cffi/issues/179
+    define_macros.append(("Py_LIMITED_API", Py_LIMITED_API))
 
 sources += walk_sources("tcod/")
 sources += walk_sources("libtcod/src/libtcod/")

build_sdl.py

@@ -350,8 +350,9 @@ def get_cdef() -> tuple[str, dict[str, str]]:
 libraries: list[str] = []
 library_dirs: list[str] = []
 
-
-if sys.platform == "darwin":
+if "PYODIDE" in os.environ:
+    pass
+elif sys.platform == "darwin":
     extra_link_args += ["-framework", "SDL3"]
 else:
     libraries += ["SDL3"]
@@ -382,6 +383,7 @@ def get_cdef() -> tuple[str, dict[str, str]]:
     extra_compile_args += (
         subprocess.check_output(["pkg-config", "sdl3", "--cflags"], universal_newlines=True).strip().split()
     )
-    extra_link_args += (
-        subprocess.check_output(["pkg-config", "sdl3", "--libs"], universal_newlines=True).strip().split()
-    )
+    if "PYODIDE" not in os.environ:
+        extra_link_args += (
+            subprocess.check_output(["pkg-config", "sdl3", "--libs"], universal_newlines=True).strip().split()
+        )