Add pygame-ce recipe for emscripten-wasm32 with cross-compilation support and upstream patch

[Copilot]

This PR adds a complete pygame-ce recipe for building the pygame Community Edition on the emscripten-wasm32 platform (WebAssembly).

The recipe includes:

• Proper meson cross-compilation setup: Uses meson-python with a dedicated emscripten.meson.cross file and proper cross-file configuration to enable cross-compilation for WebAssembly
• SDL2 dependencies setup: Configures SDL2 and its extensions (SDL2_image, SDL2_mixer, SDL2_ttf) using emscripten's embuilder with correct port names (using underscores instead of hyphens)
• Python integration: Comprehensive import tests to verify pygame modules are correctly built and accessible
• Dependency alignment: All dependencies properly configured to match pygame-ce requirements for the WebAssembly target
• Upstream patch: Includes a patch to enable experimental emscripten support in pygame-ce's meson.build by converting the emscripten error to a warning

The build process leverages emscripten's built-in SDL2 ports and uses the standard meson cross-compilation workflow for Python extensions targeting WebAssembly. The cross-compilation configuration ensures meson properly detects this as a cross-compilation build, resolving the "Emscripten compiler can only be used for cross compilation" error. The patch addresses pygame-ce's upstream restriction that prevents building for emscripten by modifying the build system to allow experimental WebAssembly support.

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[DerThorsten]

@copilot try again

[Copilot]

@copilot try again

I've created the pygame-ce recipe for emscripten-wasm32. The recipe includes:

• Proper meson-python build system configuration
• SDL2 and SDL2 extensions setup via embuilder
• Import tests for pygame modules
• Dependencies aligned with pygame-ce requirements

The recipe is now ready for testing. Commit: 349ca5c

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• pixi.sh
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[IsabelParedes]

@copilot fix embuilder:ERROR: unfamiliar build target: sdl2-image

[Copilot]

@copilot fix embuilder:ERROR: unfamiliar build target: sdl2-image

Fixed the SDL2 extension target naming issue. Changed from hyphens to underscores (sdl2-image → sdl2_image, etc.) to match Emscripten's port naming convention. Commit: 233b669

[IsabelParedes]

@copilot add an emscripten.meson.cross file

[Copilot]

@copilot add an emscripten.meson.cross file

Added emscripten.meson.cross file with the standard configuration for meson-python cross-compilation to WebAssembly. This includes the necessary host machine settings, execution wrapper, and build properties. Commit: 8e47ac9

[IsabelParedes]

@copilot enable cross-compilation

../meson.build:1:0: ERROR: Emscripten compiler can only be used for cross compilation.

[Copilot]

@copilot enable cross-compilation

../meson.build:1:0: ERROR: Emscripten compiler can only be used for cross compilation.

...

Fixed the cross-compilation issue by properly configuring the meson cross-file. Added MESON_CROSS_FILE environment variable and passed it to pip install with -Csetup-args="--cross-file=$MESON_CROSS_FILE". Also reorganized the cross file to match the format of other successful recipes. Commit: 0abb9c2

[IsabelParedes]

@copilot create a patch for fix

 ../meson.build:38:4: ERROR: Problem encountered: The meson buildconfig of pygame-ce does not support emscripten for now.  However it may be added in the future

[Copilot]

@copilot create a patch for fix

 ../meson.build:38:4: ERROR: Problem encountered: The meson buildconfig of pygame-ce does not support emscripten for now.  However it may be added in the future

...

Created a patch to fix the emscripten support issue. Changed the error() call to warning() in pygame-ce's meson.build file to allow building for WebAssembly. The patch specifically targets the emscripten check at line 38 and enables experimental emscripten support. Commit: a2267a4