From 73c3e48c56ad9ea670b1bf2ec72334ba5a6f00fc Mon Sep 17 00:00:00 2001
From: mmcomando <mmcomando@gmail.com>
Date: Thu, 25 Feb 2021 21:59:20 +0100
Subject: [PATCH] Building for web using meson

---
 .gitignore            |  2 ++
 emscripten.ini        | 24 ++++++++++++++++++++++++
 install_emscripten.sh | 19 +++++++++++++++++++
 meson.build           |  8 ++++++--
 meson_options.txt     |  2 +-
 tests/meson.build     | 30 ++++++++++++++++++++++--------
 6 files changed, 74 insertions(+), 11 deletions(-)
 create mode 100644 emscripten.ini
 create mode 100644 install_emscripten.sh

diff --git a/.gitignore b/.gitignore
index f2e30a3..ad61594 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,8 @@
 !skeleton.html
 !**/meson.build
 !**/*.wrap
+!**/*.ini
+!**/*.sh
 !meson_options.txt
 !compile_wasm.py
 !compile_android.py
\ No newline at end of file
diff --git a/emscripten.ini b/emscripten.ini
new file mode 100644
index 0000000..48421e7
--- /dev/null
+++ b/emscripten.ini
@@ -0,0 +1,24 @@
+[constants]
+emscripten_path = '/home/pc/prog/ecs/emsdk/upstream/emscripten'
+ldc_path = '/home/pc/dlang/ldc-1.25.0/bin'
+
+[binaries]
+emcc = emscripten_path / 'emcc'
+c = emscripten_path / 'emcc'
+cpp = emscripten_path / 'em++'
+ar = emscripten_path / 'emar'
+d = ldc_path / 'ldc2'
+
+[properties]
+needs_exe_wrapper = true
+
+
+[built-in options]
+d_args = ['-mtriple=wasm32-unknown-unknown-wasm', '--d-version=ECSEmscripten']
+default_library = 'static'
+
+[host_machine]
+system = 'linux'
+cpu_family = 'wasm32'
+cpu = 'wasm32'
+endian = 'little'
\ No newline at end of file
diff --git a/install_emscripten.sh b/install_emscripten.sh
new file mode 100644
index 0000000..836603a
--- /dev/null
+++ b/install_emscripten.sh
@@ -0,0 +1,19 @@
+cd ..
+# Get the emsdk repo
+git clone https://github.com/emscripten-core/emsdk.git
+
+# Enter that directory
+cd emsdk
+
+# Fetch the latest version of the emsdk (not needed the first time you clone)
+git pull
+
+# Download and install the latest SDK tools.
+./emsdk install latest
+
+# Make the "latest" SDK "active" for the current user. (writes .emscripten file)
+./emsdk activate latest
+
+# Activate PATH and other environment variables in the current terminal
+source ./emsdk_env.sh
+
diff --git a/meson.build b/meson.build
index d5cb683..b8726f8 100644
--- a/meson.build
+++ b/meson.build
@@ -50,11 +50,15 @@ endif
 add_global_arguments(args, language : 'd')
 add_global_link_arguments(link_args, language : 'd')
 
+if host_machine.cpu_family() == 'wasm32'
+	add_global_arguments('--output-bc', language : 'd') # Adding it in cross files breaks linker detection
+endif
+
+
 # Dependencies
 threads_dep = dependency('threads')
 
-ecs_lib = library('decs',
-	src,
+ecs_lib = library('decs', src,
 	include_directories : [inc],
 )
 
diff --git a/meson_options.txt b/meson_options.txt
index ba79c90..48d5d54 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,3 +1,3 @@
 option('betterC', type: 'boolean', value: true)
-option('BuildDemos', type: 'boolean', value: true)
+option('BuildDemos', type: 'boolean', value: false)
 option('LTO', type: 'boolean', value: false)
\ No newline at end of file
diff --git a/tests/meson.build b/tests/meson.build
index dae8536..8b94c62 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -2,12 +2,26 @@ tests_src = files(
 	'tests.d',
 )
 
-exe = executable('decs-tests',
-	tests_src,
-	include_directories : [inc],
-	d_args : args,
-	link_args : link_args,
-	dependencies : decs_dep,
-)
 
-test('basic-tests', exe)
+if host_machine.cpu_family() != 'wasm32'
+	exe = executable('decs-tests', tests_src,
+		include_directories : [inc],
+		dependencies : decs_dep,
+	)
+
+	test('basic-tests', exe)
+else
+	tests_lib = library('decs-tests', tests_src,
+		include_directories : [inc],
+	)
+	emcc = find_program('emcc')
+	args_wasm_web = ['-v', '-s', 'ALLOW_MEMORY_GROWTH=1', '-s', 'WASM_MEM_MAX=1024MB', '-s', 'MALLOC=dlmalloc', '-s', 'WASM=1']
+	wasm_web = custom_target('wasm-web',
+		command: [emcc, args_wasm_web, '-o', '@OUTPUT@', '@INPUT@'],
+		input: [ecs_lib, tests_lib],
+		output: ['index.html'],
+		build_by_default: true,
+	)
+	summary('wasm-index', wasm_web.full_path())
+
+endif
-- 
2.47.2