feat: meson build

Author: superstructor

deno.json

@@ -17,15 +17,15 @@
     "demo": "deno run --allow-read --allow-write demo-deno-fixed.ts",
     "test": "deno test --allow-read --no-check tests/deno/",
     "test:basic": "deno test --allow-read --no-check tests/deno/basic.test.ts",
-    "build": "deno task build:wasm",
-    "build:wasm": "./build-dual.sh all",
-    "build:side": "./build-dual.sh side",
-    "build:main": "./build-dual.sh main",
+    "build": "deno task build:wasm:meson",
+    "build:main:meson": "meson setup build-main --cross-file=scripts/emscripten.cross --prefix=$PWD/install -Dlibdir=wasm -Dbindir=wasm && meson compile -C build-main libpng-main && meson install -C build-main",
+    "build:side:meson": "meson setup build-side --cross-file=scripts/emscripten.cross --prefix=$PWD/install -Dlibdir=wasm -Dbindir=wasm && meson compile -C build-side libpng-side && meson install -C build-side",
+    "build:wasm:meson": "deno task build:main:meson && deno task build:side:meson",
     "build:npm": "deno run --allow-all _build_npm.ts",
     "build:all": "deno task build:wasm && deno task build:npm",
     "publish:npm": "deno task build:all && cd npm && npm publish",
     "publish:dry": "deno task build:all && cd npm && npm publish --dry-run",
-    "clean": "rm -rf build-dual/ install/ dist/ npm/",
+    "clean": "rm -rf build-* install/ dist/ npm/",
     "check": "deno check src/lib/index.ts",
     "check:all": "deno check src/lib/index.ts && deno check demo-deno-fixed.ts"
   },
@@ -47,4 +47,4 @@
     "include": ["tests/deno/"],
     "exclude": ["tests/unit/"]
   }
-}
+}

meson.build

@@ -0,0 +1,39 @@
+project('libpng.wasm', 'c', version: '1.6.44', meson_version: '>=1.3.0')
+
+simd = get_option('simd')
+
+incs = include_directories('.')
+
+png_sources = files(
+  'png.c','pngerror.c','pngget.c','pngmem.c','pngpread.c','pngread.c','pngrio.c','pngrtran.c','pngrutil.c','pngset.c','pngtrans.c','pngwio.c','pngwrite.c','pngwtran.c','pngwutil.c'
+)
+
+cargs = []
+if simd
+  cargs += ['-msimd128']
+endif
+
+# MAIN links to Emscripten zlib
+executable('libpng-main',
+  files('wasm/libpng_wasm_module.c') + png_sources,
+  include_directories: incs,
+  c_args: cargs,
+  link_args: [
+    '-sUSE_ZLIB=1','-sWASM=1','-sMODULARIZE=1','-sEXPORT_ES6=1','-sEXPORT_NAME=LibpngModule',
+    '-sALLOW_MEMORY_GROWTH=1','-sNO_FILESYSTEM=1','-sEXPORTED_RUNTIME_METHODS=["cwrap","ccall","UTF8ToString"]','-O3','-flto'
+  ],
+  install: true,
+  install_dir: get_option('bindir')
+)
+
+# SIDE relies on host to provide zlib; allow unresolved symbols
+shared_module('libpng-side',
+  files('wasm/libpng_wasm_side.c') + png_sources,
+  include_directories: incs,
+  name_prefix: '',
+  c_args: cargs,
+  link_args: ['-sSIDE_MODULE=2','-fPIC','-O3','-flto','-sERROR_ON_UNDEFINED_SYMBOLS=0','-sEXPORTED_FUNCTIONS=["_libpng_wasm_version"]'],
+  install: true,
+  install_dir: get_option('libdir')
+)
+

meson.options

@@ -0,0 +1,3 @@
+option('main_module', type: 'boolean', value: true)
+option('side_module', type: 'boolean', value: true)
+option('simd', type: 'boolean', value: true)

scripts/emscripten.cross

@@ -0,0 +1,17 @@
+[binaries]
+c = 'emcc'
+cpp = 'em++'
+ar = 'emar'
+ranlib = 'emranlib'
+strip = 'llvm-strip'
+pkgconfig = 'em-pkg-config'
+
+[built-in options]
+c_args = []
+c_link_args = []
+
+[host_machine]
+system = 'emscripten'
+cpu_family = 'wasm32'
+cpu = 'wasm32'
+endian = 'little'

scripts/postinstall.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python3
+import os, sys, shutil
+
+def main():
+    prefix = os.environ.get('MESON_INSTALL_DESTDIR_PREFIX') or (sys.argv[1] if len(sys.argv) > 1 else None)
+    if not prefix:
+        prefix = os.getcwd()
+    wasm_dir = os.path.join(prefix, 'wasm')
+    if not os.path.isdir(wasm_dir):
+        return 0
+    target = os.path.join(wasm_dir, 'libpng-side.wasm')
+    if os.path.exists(target):
+        return 0
+    for f in os.listdir(wasm_dir):
+        if f.endswith('.wasm'):
+            shutil.copy2(os.path.join(wasm_dir,f), target)
+            break
+    return 0
+
+if __name__ == '__main__':
+    raise SystemExit(main())
+

wasm/libpng_wasm_module.c

@@ -0,0 +1,8 @@
+#include <emscripten.h>
+#include "png.h"
+
+EMSCRIPTEN_KEEPALIVE
+const char* libpng_wasm_version(void) {
+  return png_get_libpng_ver(NULL);
+}
+

wasm/libpng_wasm_side.c

@@ -0,0 +1,6 @@
+#include "png.h"
+
+const char* libpng_wasm_version(void) {
+  return png_get_libpng_ver(NULL);
+}
+