Hi All,
Building on my recent JavaScript project, I’ve been working toward my main goal of having access to a bare WebGL API.
Though this could simply be done in JavaScript, WebAssembly provides some performance benefits. This is where AssemblyScript comes in; it’s a TypeScript-like language that compiles to WebAssembly and even better still the compiler can run entirely within a browser environment!
The WebGL AS project is a work-in-progress and currently only serves as a proof of concept & example of more advanced usage of the AssemblyScript Codea library.
Here are a few demos of the API in action:
Simple script
local webview = WebView()
local asc = ASCompiler()
-- Compile a simple script
local bin = asc:compile([[
export function main(): u32 {
print("[demo_simple] Hello Codea!");
return 5;
}
]])
print("[demo_simple] compiled")
-- Load it into the webview
local module = bin:load(webview)
-- Call the exported main() function
print("[demo_simple] returned: " .. module:call("main"))
Multiple sources
local webview = WebView()
local asc = ASCompiler()
-- Sources
local src_lib1 = ASSource(
'lib1', -- Source name
"export const DEMO_VAL: u32 = 32;" -- Source
)
local src_lib2 = ASSource('lib2', [[
export function Times4(val: u32): u32 {
return val * 4;
}
]])
local src_main = ASSource('main', [[
import { DEMO_VAL } from 'lib1';
import { Times4 } from 'lib2';
export function main(): u32 {
return Times4(DEMO_VAL);
}
]],
nil, -- No imports
{ src_lib1, src_lib2 }) -- 2 dependencies
-- Compile a the main script
local bin = asc:compile(src_main)
print("[demo_multi_source] compiled")
-- Load it into the webview
local module = bin:load(webview)
-- Call the exported main() function
print("[demo_multi_source] returned: " .. module:call("main"))
Imports
local webview = WebView()
local asc = ASCompiler()
-- Source
local src_main = ASSource('main', [[
declare function getLuaVersion(): string;
declare const LUA_VERSION: string;
declare const IMPORT_VAL: u32;
export function main(): void {
print(`[demo_imports] Lua: ${getLuaVersion()}`);
print(`[demo_imports] Imported val: ${IMPORT_VAL}`);
print(`[demo_imports] Lua string: ${LUA_VERSION}`);
}
]],
{
-- Imports, these map values declared in AssemblyScript
-- to values provided by JavaScript.
--
-- These can provide functions
["getLuaVersion(): string"] = [[
() => codea.lua_version // Read JS imported value
]],
-- Or values directly
["IMPORT_VAL: u32"] = 970932,
-- String values are NOT currently supported
-- and will always evaluate to 'undefined'
["LUA_VERSION: string"] = "codea.lua_version"
})
-- Import the Lua version into JS
webview:import("codea", {
lua_version = _VERSION
})
-- Compile a the main script
local bin = asc:compile(src_main)
print("[demo_imports] compiled")
-- Load it into the webview
local module = bin:load(webview)
-- Call the exported main() function
module:call("main")
