AGENTS.md: web bundle size

client/AGENTS.md

@@ -239,7 +239,9 @@ the markup colors). Fields refuse `<` and `&`. Measuring (`ui.text_width`,
   components.
 - `mmwindow/`: our native extension, `mmwindow.set_fullscreen(on)` / `is_fullscreen()`
   (the engine's GLFW window to its monitor and back; Defold has no runtime fullscreen).
-  Changing it rebuilds the engine on the build server.
+  Changing it rebuilds the engine on the build server. On the web it builds as stubs; the
+  browser's Fullscreen API is used instead (`modules/screen.lua`).
+- `web/index.html`: the web build's page (`[html5] htmlfile`; see Web build).
 - `screens/game/`: the game screen (above). Also `market.lua` (`ticker.lua` (pauses on hover; items not in the Tab order: `test.register(..., no_focus)`), `sale.lua` (the sell power-down, kept
   by time on g and rebound every build; fx.lua asks `g.on_sale` for the coins' origin),
   `chart.lua`
@@ -298,12 +300,42 @@ file),
 - `scripts/`: `shot.sh` (headless screenshot), `views.sh` (every section, any build),
   `fixture.py` (a test player), `drive.py` + `scenarios/` (test driver), `dev.py` (hot
   reload), `check.py` (make check), `refinery-play.sh`, `moon-check.mjs`,
-  `zzfx-render.mjs`.
+  `zzfx-render.mjs`, `serve-web.py` and `web-shots.mjs` (Web build).
+
+## Web build
+`make web` bundles for the browser (`wasm-web`, release; `WEB_VARIANT=debug` keeps logs
+and the test hook) into `dist/web/MoonMiners/` (release ~4.3 MB, ~2.4 MB gzipped: engine wasm 2.9 MB,
+archive 1.1 MB, page and loader).
+`make serve-web` (`scripts/serve-web.py`, `UPSTREAM=` default http://localhost:3000,
+`WEB_PORT=` 8080) serves it and proxies `/api/*` and `/static/*` (everything the client
+fetches) to the server, so the game talks to its own origin; the server stays unchanged.
+- The page (`web/index.html`): the canvas fills the window in device pixels and follows
+  its size (the layout is native-pixel like desktop); dark loading screen; "WebGL 2
+  needed" without WebGL 2 (the moon's shaders don't build for WebGL 1). `[html5]` in
+  game.project: `stretch`, no Defold buttons or banner, heap 256 MB.
+- On html5 (`if html5 then`): `api.base` is the page's origin (`?api=<url>` picks another
+  server, which must allow CORS); the player id and settings are saved with sys.save
+  (IndexedDB), X-MM-User sent as on desktop (the cookie works too, same origin).
+  Fullscreen (F11, display dialog) through the browser's Fullscreen API, not saved or
+  restored (the browser allows it only after a click or key). Moon generation is plain
+  Lua there (no LuaJIT): grid capped at 96 (`WEB_RESOLUTION`) and 12 ms a frame, a few
+  seconds per moon. Moon targets fall back to 8 bits without EXT_color_buffer_float.
+- WebGL: every sampler of a bound program must not be the framebuffer being drawn
+  ("feedback loop", the draw is dropped), and Firefox aborts on resizing a target with a
+  depth buffer: the render script binds every bloom sampler and makes targets again at a
+  new size. Check the console after render changes.
+- Test: `make web WEB_VARIANT=debug`, `scripts/serve-web.py --port 8161 --upstream <dev
+  server>`, then `node scripts/web-shots.mjs http://127.0.0.1:8161/ fx.json <out>
+  [chromium|firefox] [WxH]` (Playwright; fx.json from `scripts/fixture.py`): every section
+  by real mouse clicks (element rects from the test hook: the page pushes commands onto
+  `window.mmTestQueue`, replies are `mm-test` console lines), the fullscreen button, a
+  claim; fails on console errors.
 
 ## Commands
 - `make build`: `bob build bundle` (debug) into `dist/x86_64-linux/MoonMiners/` (`build/` is
   bob's output; `build/x86_64-linux/dmengine` is the engine with our extension).
 - `make run ARGS="--config=mm.api_base=http://localhost:3001"`: build and start.
+- `make web`, `make serve-web`: the browser build (Web build).
 - `make shot`: run under `xvfb-run` at 1280x800, save `dist/shot.png`, quit. `SHOT=`,
   `POPUP=1` (a dialog open), `SETTLE=5`, `SCREEN=1920x1080 make shot
   ARGS="--config=mm.window=1920x1080"`. Log in `dist/shot.log`. Give 2560x1600
@@ -429,7 +461,7 @@ against `MM_API` (default http://localhost:3000) when it answers; otherwise the
 `dist/drive/*/game.log` is checked. `scripts/check.py --static` skips it.
 
 ## Config (`[mm]` in game.project, or `--config=mm.<key>=<value>` at launch)
-- `api_base`: server URL (default `http://localhost:3000`). The player id is saved per
+- `api_base`: server URL (default `http://localhost:3000`; on the web the page's origin). The player id is saved per
   server.
 - `new_player`: `1` forgets the saved player on start. `player`: play as this id.
 - `autoplay`: `1` runs the scripted play-through (`make play`); `autoplay_script=refinery`.

client/Makefile

@@ -11,7 +11,7 @@ SHOT      ?= dist/shot.png
 # Extra engine args, e.g. ARGS="--config=mm.api_base=http://localhost:3001"
 ARGS      ?=
 
-.PHONY: build run shot play clean resolve dev reload dev-stop drive check
+.PHONY: build run shot play clean resolve dev reload dev-stop drive check web serve-web
 
 $(BOB):
 	mkdir -p tools
@@ -29,6 +29,19 @@ build: $(BOB) .internal/lib/dependencies.json
 	java -jar $(BOB) --platform $(PLATFORM) --architectures $(PLATFORM) --variant $(VARIANT) \
 		--archive --bundle-output dist/$(PLATFORM) build bundle
 
+# Web build (WebAssembly) into dist/web/MoonMiners/ (index.html + engine + archive). Release
+# by default; WEB_VARIANT=debug keeps logs and the test hook (window.mmTestQueue).
+# `make serve-web` serves it on :8080 with /api and /static proxied to UPSTREAM.
+WEB_VARIANT ?= release
+UPSTREAM    ?= http://localhost:3000
+WEB_PORT    ?= 8080
+web: $(BOB) .internal/lib/dependencies.json
+	java -jar $(BOB) --platform wasm-web --architectures wasm-web --variant $(WEB_VARIANT) \
+		--archive --bundle-output dist/web build bundle
+
+serve-web:
+	scripts/serve-web.py --port $(WEB_PORT) --upstream $(UPSTREAM)
+
 # Hot reload loop: `make dev` starts the game from build/default (once), `make reload`
 # rebuilds (no bundle) and posts what changed to the running engine. HEADLESS=1 make dev
 # runs it under Xvfb. See AGENTS.md "Fast iteration".

client/game.project

@@ -56,3 +56,11 @@ view =
 
 [sound]
 max_component_count = 64
+
+[html5]
+htmlfile = /web/index.html
+scale_mode = stretch
+show_fullscreen_button = 0
+show_made_with_defold = 0
+show_console_banner = 0
+heap_size = 256

client/modules/api.lua

@@ -8,11 +8,21 @@
 -- visit; it is kept with sys.save so the same player comes back.
 --
 -- Base URL: game.project [mm] api_base (default http://localhost:3000), overridable at
--- launch with --config=mm.api_base=http://host:port.
+-- launch with --config=mm.api_base=http://host:port. In a browser: the page's origin.
 
 local M = {}
 
 M.base = sys.get_config_string("mm.api_base", "http://localhost:3000"):gsub("/+$", "")
+-- In a browser (the web build) the page's own origin: the browser only lets the game talk
+-- to it (scripts/serve-web.py serves the game there and proxies the server's paths). A
+-- page URL with ?api=<url> picks another server (it must allow cross-origin requests).
+if html5 then
+	local ok, origin = pcall(html5.run,
+		"(new URLSearchParams(location.search).get('api') || location.origin).replace(/\\/+$/, '')")
+	if ok and type(origin) == "string" and origin:match("^https?://") then
+		M.base = origin
+	end
+end
 M.timeout = 10
 
 -- Debug: mm.fake_latency_ms delays every request by half of it and its response by the

client/modules/screen.lua

@@ -9,7 +9,8 @@
 -- screen, window.get_display_scale(); high_dpi is on, so window sizes are physical pixels;
 -- --config=mm.display_scale=2 pretends one). screens pick changes up on their next update.
 --
--- Fullscreen: the mmwindow native extension (mmwindow/), saved with the UI scale; F11 and
+-- Fullscreen: the mmwindow native extension (mmwindow/), saved with the UI scale (in a
+-- browser: the Fullscreen API, not saved); F11 and
 -- the display settings (screens/game/settings.lua) toggle it.
 --
 -- A screen's "root" node keeps adjust FIT against 1280x800 (display.width/height); M.fit(root)
@@ -81,16 +82,39 @@ end
 
 ---------------------------------------------------------------- fullscreen
 
-function M.can_fullscreen()
-	return mmwindow ~= nil
+-- In a browser (html5) the page's Fullscreen API instead: the browser only allows it
+-- shortly after a click or key press (fine from an input handler), so the saved state isn't
+-- applied at start and isn't saved; the browser's own F11 works too (the canvas fills the
+-- window either way).
+local function js(code)
+	local ok, r = pcall(html5.run, code)
+	return ok and r or ""
 end
 
+function M.can_fullscreen()
+	return html5 ~= nil or mmwindow ~= nil
+end
+
+local web_wanted, web_wanted_at -- the last request (the browser answers a moment later)
+
 function M.fullscreen()
+	if html5 then
+		if web_wanted ~= nil and socket.gettime() - web_wanted_at < 1 then
+			return web_wanted
+		end
+		return js("document.fullscreenElement ? '1' : ''") == "1"
+	end
 	return mmwindow ~= nil and mmwindow.is_fullscreen()
 end
 
--- Fullscreen on or off; saved.
+-- Fullscreen on or off; saved (not in a browser).
 function M.set_fullscreen(on)
+	if html5 then
+		web_wanted, web_wanted_at = on, socket.gettime()
+		js(on and "document.documentElement.requestFullscreen && document.documentElement.requestFullscreen().catch(function(){})"
+			or "document.fullscreenElement && document.exitFullscreen().catch(function(){})")
+		return
+	end
 	if mmwindow then
 		mmwindow.set_fullscreen(on)
 	end
@@ -105,7 +129,7 @@ end
 -- At start (main.script): the saved fullscreen, unless the window size is forced
 -- (--config=mm.window, tests and shots).
 function M.apply_saved()
-	if M.want_fullscreen and mmwindow and sys.get_config_string("mm.window", "") == "" then
+	if M.want_fullscreen and mmwindow and not html5 and sys.get_config_string("mm.window", "") == "" then
 		mmwindow.set_fullscreen(true)
 	end
 end

client/modules/test.lua

@@ -451,6 +451,18 @@ function M.update(g, input, api)
 		end
 		return
 	end
+	-- In a browser (debug web build) there's no engine service: the page pushes commands
+	-- ({id, cmd, args}) onto window.mmTestQueue; replies are the same console lines.
+	if html5 then
+		local ok, s = pcall(html5.run, "window.mmTestQueue && window.mmTestQueue.length ? JSON.stringify(window.mmTestQueue.splice(0)) : ''")
+		if ok and s ~= "" then
+			local dok, list = pcall(json.decode, s)
+			for _, c in ipairs(dok and list or {}) do
+				c.args = c.args or {}
+				table.insert(_G.mm_test_queue, c)
+			end
+		end
+	end
 	local q = _G.mm_test_queue
 	if #q == 0 then
 		return

client/moon/moon.script

@@ -24,7 +24,8 @@ local FOV = math.rad(35)
 local RESUME = 1.5 -- seconds before auto-rotation resumes after a drag
 local ROTATE_SPEED = 0.6
 local DAMPING = 0.05
-local BUDGET = 0.006 -- seconds of generation work per frame
+local BUDGET = html5 and 0.012 or 0.006 -- seconds of generation work per frame (the web runs
+-- plain Lua, no LuaJIT: several times slower, so it gets more of each frame)
 local CACHE_SIZE = 6
 local SUPERSAMPLE = 2 -- the scene renders at 2x and is averaged down (antialiasing)
 local CHARGE = 1.1 -- reveal: charge-up before the burst (s)
@@ -183,7 +184,12 @@ end
 
 -- A job: a coroutine that generates the moon and fills a buffer, yielding when the
 -- frame's budget is spent.
+local WEB_RESOLUTION = 96 -- the web's cap on the grid (plain Lua: a quarter of the work of 180)
+
 local function start_job(self, id, key, params)
+	if html5 and params.resolution and params.resolution > WEB_RESOLUTION then
+		params.resolution = WEB_RESOLUTION
+	end
 	local job = { id = id, key = key, params = params, started = now(), frames = 0, work = 0 }
 	job.co = coroutine.create(function()
 		local function checkpoint()

client/render/mm.render_script

@@ -10,16 +10,36 @@ local moon = require("modules.moon.moon")
 --
 -- moon pass
 --
--- An HDR (half float) render target, kept and resized as needed; `depth` adds a depth buffer.
+-- An HDR (half float) render target, kept and made again at a new size; `depth` adds a depth buffer.
+-- Without half float targets (graphics leaves the constant out; in a browser WebGL 2 can
+-- sample them but draws into them only with EXT_color_buffer_float) an 8-bit one: the moon
+-- still shows, with less bloom range.
+local HDR_FORMAT = graphics.TEXTURE_FORMAT_RGBA16F
+if HDR_FORMAT and html5 then
+    local ok, has = pcall(html5.run, "(function(){var c=document.createElement('canvas').getContext('webgl2');"
+        .. "return c&&c.getExtension('EXT_color_buffer_float')?'1':''})()")
+    if not (ok and has == "1") then
+        HDR_FORMAT = nil
+    end
+end
+HDR_FORMAT = HDR_FORMAT or graphics.TEXTURE_FORMAT_RGBA
+if HDR_FORMAT == graphics.TEXTURE_FORMAT_RGBA then
+    print("render: no half float render targets, the moon renders in 8 bits")
+end
 local function hdr_target(self, name, w, h, depth)
     local t = self.targets[name]
     if t and t.w == w and t.h == h then
         return t.rt
     end
+    -- A new size makes a new target: resizing one with a depth buffer in place
+    -- (set_render_target_size) leaves it incomplete for a moment, which WebGL in Firefox
+    -- reports as an error, and the engine aborts.
     if t then
-        render.set_render_target_size(t.rt, w, h)
-    else
-        local params = { [graphics.BUFFER_TYPE_COLOR0_BIT] = { format = graphics.TEXTURE_FORMAT_RGBA16F,
+        render.delete_render_target(t.rt)
+        t = nil
+    end
+    do
+        local params = { [graphics.BUFFER_TYPE_COLOR0_BIT] = { format = HDR_FORMAT,
             width = w, height = h, min_filter = graphics.TEXTURE_FILTER_LINEAR, mag_filter = graphics.TEXTURE_FILTER_LINEAR,
             u_wrap = graphics.TEXTURE_WRAP_CLAMP_TO_EDGE, v_wrap = graphics.TEXTURE_WRAP_CLAMP_TO_EDGE } }
         if depth then
@@ -53,6 +73,12 @@ local function draw_bloom(self, f, scene_rt)
     local bright = hdr_target(self, "bloom_bright", w, h)
     c.post = vmath.vector4(0, 0, 0, 0)
     c.post2 = vmath.vector4(0, 0, b.z, 0)
+    -- Every sampler of moon_post gets a texture that no bloom pass draws into: the units
+    -- otherwise keep the targets bound last frame, and WebGL refuses a draw whose program
+    -- samples its own framebuffer ("feedback loop"), even from an unused sampler.
+    for i = 1, #BLOOM_KERNELS - 1 do
+        render.enable_texture("tex" .. i, scene_rt, graphics.BUFFER_TYPE_COLOR0_BIT)
+    end
     render.enable_texture("tex0", scene_rt, graphics.BUFFER_TYPE_COLOR0_BIT)
     pass(bright, w, h)
     local input = bright

client/scripts/serve-web.py

@@ -0,0 +1,123 @@
+#!/usr/bin/env python3
+"""Serve the web build (make web) and proxy the game server's paths to it, so the game
+talks to its own origin (the browser allows nothing else without CORS).
+
+    scripts/serve-web.py [--port 8080] [--upstream http://localhost:3000] [--dir dist/web/MoonMiners]
+
+/api/* (the JSON API) and /static/* (catalog images, moon settings) go to the upstream
+with their method, headers and body; responses come back as they are (status, body,
+X-MM-User, Set-Cookie). Everything else is a file from --dir. Ctrl-C stops it.
+"""
+
+import argparse
+import http.client
+import os
+import sys
+import urllib.parse
+from http.server import SimpleHTTPRequestHandler, ThreadingHTTPServer
+
+PROXIED = ("/api/", "/static/")
+# Hop-by-hop headers (and ones the proxy sets itself) aren't forwarded.
+SKIP_REQ = {"host", "connection", "keep-alive", "proxy-connection", "te", "trailer",
+            "transfer-encoding", "upgrade", "accept-encoding", "content-length"}
+SKIP_RESP = {"connection", "keep-alive", "transfer-encoding", "upgrade", "content-length",
+             "server", "date"}
+
+
+def make_handler(root, upstream):
+    up = urllib.parse.urlsplit(upstream)
+    conn_cls = http.client.HTTPSConnection if up.scheme == "https" else http.client.HTTPConnection
+    up_host = up.netloc
+
+    class Handler(SimpleHTTPRequestHandler):
+        protocol_version = "HTTP/1.1"
+        extensions_map = {**SimpleHTTPRequestHandler.extensions_map,
+                          ".wasm": "application/wasm", ".js": "text/javascript",
+                          ".json": "application/json", "": "application/octet-stream"}
+
+        def __init__(self, *a, **kw):
+            super().__init__(*a, directory=root, **kw)
+
+        def log_message(self, fmt, *args):
+            sys.stderr.write("%s %s\n" % (self.address_string(), fmt % args))
+
+        def proxied(self):
+            return self.path.startswith(PROXIED)
+
+        def end_headers(self):
+            if not self.proxied():
+                # Always the newest build (no stale engine after make web).
+                self.send_header("Cache-Control", "no-cache")
+            super().end_headers()
+
+        def proxy(self):
+            length = int(self.headers.get("Content-Length") or 0)
+            body = self.rfile.read(length) if length else None
+            headers = {k: v for k, v in self.headers.items() if k.lower() not in SKIP_REQ}
+            headers["Host"] = up_host
+            headers["X-Forwarded-For"] = self.client_address[0]
+            path = (up.path.rstrip("/") + self.path) if up.path else self.path
+            try:
+                conn = conn_cls(up_host, timeout=30)
+                conn.request(self.command, path, body=body, headers=headers)
+                resp = conn.getresponse()
+                data = resp.read()
+            except OSError as e:
+                msg = ('{"error": "upstream %s unreachable: %s"}' % (upstream, e)).encode()
+                self.send_response(502)
+                self.send_header("Content-Type", "application/json")
+                self.send_header("Content-Length", str(len(msg)))
+                self.end_headers()
+                self.wfile.write(msg)
+                return
+            self.send_response(resp.status, resp.reason)
+            for k, v in resp.getheaders():
+                if k.lower() not in SKIP_RESP:
+                    self.send_header(k, v)
+            self.send_header("Content-Length", str(len(data)))
+            self.end_headers()
+            if self.command != "HEAD":
+                self.wfile.write(data)
+            conn.close()
+
+        def do_GET(self):
+            if self.proxied():
+                return self.proxy()
+            super().do_GET()
+
+        def do_HEAD(self):
+            if self.proxied():
+                return self.proxy()
+            super().do_HEAD()
+
+        def do_POST(self):
+            if self.proxied():
+                return self.proxy()
+            self.send_error(405)
+
+        do_PUT = do_DELETE = do_PATCH = do_POST
+
+    return Handler
+
+
+def main():
+    here = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+    p = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
+    p.add_argument("--port", type=int, default=8080)
+    p.add_argument("--bind", default="127.0.0.1")
+    p.add_argument("--upstream", default="http://localhost:3000")
+    p.add_argument("--dir", default=os.path.join(here, "dist", "web", "MoonMiners"))
+    a = p.parse_args()
+    if not os.path.isfile(os.path.join(a.dir, "index.html")):
+        sys.exit("serve-web: no build in %s (make web)" % a.dir)
+    srv = ThreadingHTTPServer((a.bind, a.port), make_handler(a.dir, a.upstream.rstrip("/")))
+    srv.daemon_threads = True
+    print("serve-web: http://%s:%d (game from %s, /api and /static from %s)" % (a.bind, a.port, a.dir, a.upstream), flush=True)
+    try:
+        srv.serve_forever()
+    except KeyboardInterrupt:
+        pass
+
+
+if __name__ == "__main__":
+    main()

client/scripts/web-shots.mjs

@@ -0,0 +1,169 @@
+// Headless browser check of the web build (make web WEB_VARIANT=debug, served by
+// scripts/serve-web.py): loads the game as a fixture player, clicks through every section
+// with the browser's own mouse (element rects from the test hook, window.mmTestQueue),
+// saves a screenshot of each and fails on console errors.
+//
+//   node scripts/web-shots.mjs <page url> <fixture.json> <out dir> [chromium|firefox] [WxH]
+//
+// Needs Playwright and its browsers (npm i playwright; PLAYWRIGHT=<its folder> if it's
+// installed elsewhere).
+// WebGL runs on SwiftShader (Chromium) or software WebRender (Firefox). Silent.
+
+import { createRequire } from "node:module";
+import fs from "node:fs";
+
+const require = createRequire(import.meta.url);
+const { chromium, firefox } = require(process.env.PLAYWRIGHT || "playwright");
+
+const [url, fixtureFile, out, browserName = "chromium", size = "1280x800"] = process.argv.slice(2);
+const [W, H] = size.split("x").map(Number);
+const fx = JSON.parse(fs.readFileSync(fixtureFile, "utf8"));
+fs.mkdirSync(out, { recursive: true });
+
+const browser = browserName === "firefox"
+	? await firefox.launch({ firefoxUserPrefs: { "webgl.force-enabled": true, "media.volume_scale": "0.0", "media.autoplay.default": 0 } })
+	: await chromium.launch({ args: ["--use-angle=swiftshader", "--enable-unsafe-swiftshader", "--ignore-gpu-blocklist", "--mute-audio", "--autoplay-policy=no-user-gesture-required"] });
+const context = await browser.newContext({ viewport: { width: W, height: H }, deviceScaleFactor: 1 });
+const origin = new URL(url).origin;
+// The player: the server's cookie (the first response echoes it as X-MM-User, which the
+// game saves like on desktop).
+await context.addCookies([{ name: "mm_user", value: fx.player, url: origin }]);
+const page = await context.newPage();
+
+const errors = [];
+const replies = new Map();
+let parts = [];
+const log = [];
+page.on("console", (m) => {
+	const t = m.text().replace(/\n$/, ""); // (engine log lines end in a newline)
+	log.push(m.type() + ": " + t);
+	if (m.type() === "error") errors.push(t);
+	if (/ERROR:/.test(t)) errors.push(t);
+	let r;
+	if ((r = t.match(/(?:^|: )mm-test-part \d+ (.*)$/s))) parts.push(r[1]);
+	else if ((r = t.match(/(?:^|: )mm-test (\d+) (.*)$/s))) {
+		replies.set(Number(r[1]), parts.join("") + r[2]);
+		parts = [];
+	}
+});
+page.on("pageerror", (e) => errors.push("pageerror: " + e.message));
+
+let nextId = 1;
+async function cmd(name, ...args) {
+	const id = nextId++;
+	await page.evaluate((c) => { (window.mmTestQueue = window.mmTestQueue || []).push(c); }, { id, cmd: name, args });
+	const t0 = Date.now();
+	while (!replies.has(id)) {
+		if (Date.now() - t0 > 60000) throw new Error("no reply to " + name + " " + args.join(" "));
+		await page.waitForTimeout(50);
+	}
+	const res = JSON.parse(replies.get(id));
+	if (!res.ok) throw new Error(name + " " + args.join(" ") + ": " + res.error);
+	return res;
+}
+const idle = () => cmd("wait_for", "st and not g.busy and not g.dirty", "40");
+
+// A real click (the browser's mouse) on a registered element's center.
+async function click(id) {
+	await cmd("scroll_to", id).catch(() => {}); // (only elements in a scroll area)
+	await page.waitForTimeout(300);
+	const { elements } = await cmd("list");
+	const e = elements.find((x) => (x.id === id || x.id.startsWith(id)) && x.rect && x.visible);
+	if (!e) throw new Error("no visible element " + id);
+	const dpr = await page.evaluate(() => window.devicePixelRatio || 1);
+	const ch = await page.evaluate(() => document.getElementById("canvas").height);
+	const x = e.rect.x / dpr, y = (ch - e.rect.y) / dpr;
+	await page.mouse.move(x, y);
+	await page.waitForTimeout(80);
+	await page.mouse.down();
+	await page.waitForTimeout(80);
+	await page.mouse.up();
+	console.log("  click", e.id, Math.round(x), Math.round(y));
+}
+async function shot(name) {
+	await page.waitForTimeout(1500);
+	await page.screenshot({ path: `${out}/${browserName}-${size}-${name}.png` });
+	console.log("  shot", name);
+}
+async function run() {
+const t0 = Date.now();
+await page.goto(url);
+await page.waitForFunction(() => document.getElementById("loading").classList.contains("done"), null, { timeout: 120000 });
+await idle();
+console.log("loaded in", (Date.now() - t0) / 1000, "s");
+// The moon's mesh (generated in Lua over frames, slower on the web).
+await cmd("wait_for", "require('modules.moon.moon').frame.has_mesh", "90");
+console.log("moon shown after", (Date.now() - t0) / 1000, "s");
+const info = await page.evaluate(() => {
+	const gl = document.createElement("canvas").getContext("webgl2");
+	return { webgl2: !!gl, colorBufferFloat: !!(gl && gl.getExtension("EXT_color_buffer_float")), heapMB: Math.round(((window.Module && Module.HEAP8 && Module.HEAP8.length) || 0) / 1048576) };
+});
+console.log("browser", info);
+
+await cmd("navigate", `{section='moons', moon='${fx.moon}'}`);
+await idle();
+await shot("moons");
+await click(`well:${fx.well}`);
+await idle();
+await shot("well");
+for (const s of ["equipment", "store", "market", "refinery", "advisors", "leaderboard", "help"]) {
+	await click(`tab:${s}`);
+	await idle();
+	await shot(s);
+}
+await click("tab:equipment");
+await idle();
+await click(`drill:${fx.drill_mining}`);
+await idle();
+await shot("drill");
+await click("nav:new-moon");
+await idle();
+await shot("new-moon");
+// The display dialog: its fullscreen button goes through the browser's Fullscreen API.
+await cmd("navigate", `{section='moons', moon='${fx.moon}'}`);
+await idle();
+await click("display");
+await shot("display");
+await click("dialog:fullscreen");
+await page.waitForTimeout(1000);
+info.fullscreen = await page.evaluate(() => !!document.fullscreenElement);
+info.fullscreenSize = await page.evaluate(() => [innerWidth, innerHeight, document.getElementById("canvas").width, document.getElementById("canvas").height]);
+console.log("fullscreen after click:", info.fullscreen, info.fullscreenSize);
+await shot("fullscreen");
+await click("dialog:fullscreen");
+await page.waitForTimeout(1000);
+info.fullscreenAfterLeave = await page.evaluate(() => !!document.fullscreenElement);
+console.log("fullscreen after second click:", info.fullscreenAfterLeave);
+await page.keyboard.press("Escape");
+// A predicted action through a real click: claim a ready drill on the moon.
+await idle();
+const before = (await cmd("state")).state;
+const { elements } = await cmd("list");
+const claim = elements.find((e) => e.id.startsWith("act:claim") && e.visible);
+if (claim) {
+	await click(claim.id);
+	await idle();
+	await page.waitForTimeout(1500);
+	const after = (await cmd("state")).state;
+	info.claim = { id: claim.id, before: before.resources, after: after.resources };
+	console.log("claim", JSON.stringify(info.claim));
+	await shot("claimed");
+}
+const wallet0 = (await cmd("state")).state;
+fs.writeFileSync(`${out}/${browserName}-${size}-state.json`, JSON.stringify({ wallet0, info }, null, 1));
+}
+
+try {
+	await run();
+} catch (e) {
+	errors.push("FAILED: " + e.message);
+	await page.screenshot({ path: `${out}/${browserName}-${size}-failed.png` }).catch(() => {});
+}
+fs.writeFileSync(`${out}/${browserName}-${size}-console.log`, log.join("\n"));
+
+await browser.close();
+if (errors.length) {
+	console.log("CONSOLE ERRORS:\n" + errors.join("\n"));
+	process.exit(1);
+}
+console.log("ok, no console errors");

client/web/index.html

@@ -0,0 +1,168 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+	<meta charset="utf-8">
+	<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0, minimal-ui, shrink-to-fit=no, viewport-fit=cover">
+	<meta name="mobile-web-app-capable" content="yes">
+	<!-- Moon Miners web build (game.project [html5] htmlfile). Based on the pinned Defold
+	     engine_template.html: the canvas fills the window (device pixels, high_dpi) and
+	     follows its size; a dark loading screen in the theme's colors; a clear message
+	     when WebGL 2 is missing (the moon's shaders don't build for WebGL 1). -->
+	<link rel="icon" href="data:,">
+	<link rel="preload" as="fetch" crossorigin href="{{DEFOLD_ARCHIVE_LOCATION_PREFIX}}/archive_files.json{{DEFOLD_ARCHIVE_LOCATION_SUFFIX}}">
+{{#DEFOLD_HAS_WASM_ENGINE}}
+{{^DEFOLD_HAS_WASM_PTHREAD_ENGINE}}
+	<link rel="preload" as="fetch" crossorigin href="{{exe-name}}_wasm.js">
+	<link rel="preload" as="fetch" crossorigin href="{{exe-name}}.wasm">
+{{/DEFOLD_HAS_WASM_PTHREAD_ENGINE}}
+{{/DEFOLD_HAS_WASM_ENGINE}}
+	<title>{{project.title}}</title>
+	<style type="text/css">
+	html, body {
+		margin: 0;
+		padding: 0;
+		width: 100%;
+		height: 100%;
+		overflow: hidden;
+		background: #040a16;
+		color: #e6f1ff;
+		font-family: "Rajdhani", "Segoe UI", system-ui, sans-serif;
+	}
+	body {
+		position: fixed; /* no overscroll */
+		inset: 0;
+		-webkit-user-select: none;
+		user-select: none;
+		-webkit-tap-highlight-color: transparent;
+		-webkit-touch-callout: none;
+	}
+	#app-container, #canvas-container {
+		position: absolute;
+		inset: 0;
+		overflow: hidden;
+	}
+	#canvas {
+		display: block;
+		width: 100%;
+		height: 100%;
+		outline: none;
+		border: 0;
+	}
+	#loading, .notice {
+		position: absolute;
+		inset: 0;
+		display: flex;
+		flex-direction: column;
+		align-items: center;
+		justify-content: center;
+		gap: 18px;
+		background: #040a16;
+		transition: opacity .35s ease;
+	}
+	#loading.done { opacity: 0; pointer-events: none; }
+	.title {
+		font-size: 15px;
+		letter-spacing: .32em;
+		text-transform: uppercase;
+		color: #5fd4ff;
+	}
+	.track {
+		width: 220px;
+		height: 3px;
+		background: #12233d;
+		overflow: hidden;
+	}
+	.fill {
+		width: 100%;
+		height: 100%;
+		background: #5fd4ff;
+		box-shadow: 0 0 10px #5fd4ff;
+		transform-origin: left;
+		transform: scaleX(0);
+		transition: transform .25s ease;
+	}
+	.notice { display: none; text-align: center; padding: 0 24px; }
+	.notice h1 { margin: 0; font-size: 22px; letter-spacing: .12em; text-transform: uppercase; color: #ffb454; }
+	.notice p { margin: 0; max-width: 460px; line-height: 1.5; color: #9bb3cf; }
+	.notice a { color: #5fd4ff; }
+	</style>
+</head>
+<body>
+	<div id="app-container">
+		<div id="canvas-container">
+			<canvas id="canvas" tabindex="1" width="{{display.width}}" height="{{display.height}}"></canvas>
+		</div>
+		<div id="loading">
+			<div class="title">Moon Miners</div>
+			<div class="track"><div class="fill" id="loading-fill"></div></div>
+		</div>
+		<div class="notice" id="webgl-not-supported">
+			<h1>WebGL 2 needed</h1>
+			<p>Moon Miners needs WebGL 2, which this browser doesn't offer (or has turned off).
+			Try a current Chrome, Firefox, Edge or Safari, with hardware acceleration on.</p>
+		</div>
+		<div class="notice" id="start-error">
+			<h1>Couldn't start</h1>
+			<p id="start-error-text">The game failed to load. Reload the page to try again.</p>
+		</div>
+		<div class="notice" id="running-from-file-warning">
+			<h1>Open it from a server</h1>
+			<p>This page has to be served over HTTP (make serve-web), not opened as a file.</p>
+		</div>
+	</div>
+	<script>
+		if (typeof globalThis === 'undefined') { window.globalThis = window; }
+	</script>
+	<script id="engine-loader" type="text/javascript" src="dmloader.js"></script>
+	<script id="engine-setup" type="text/javascript">
+		(function() {
+			var loading = document.getElementById("loading");
+			var fill = document.getElementById("loading-fill");
+			function show(id) {
+				loading.classList.add("done");
+				document.getElementById(id).style.display = "flex";
+			}
+			// Our own loading screen instead of Defold's progress bar under the canvas.
+			ProgressView.addProgress = function() {};
+			ProgressView.updateProgress = function(p) {
+				fill.style.transform = "scaleX(" + Math.min(p, 100) / 100 + ")";
+			};
+			// Called when the engine starts (dmloader postRun / _callMain).
+			ProgressView.removeProgress = function() {
+				fill.style.transform = "scaleX(1)";
+				setTimeout(function() { loading.classList.add("done"); }, 150);
+			};
+			CUSTOM_PARAMETERS.start_error = function(error) {
+				if (error && error.message) {
+					document.getElementById("start-error-text").textContent = "The game failed to load (" + error.message + "). Reload the page to try again.";
+				}
+				show("start-error");
+			};
+			CUSTOM_PARAMETERS.unsupported_webgl_callback = function() { show("webgl-not-supported"); };
+			// Full window: the canvas takes the whole viewport, in device pixels; the game
+			// lays itself out at native pixel size (modules/screen.lua) like on desktop.
+			CUSTOM_PARAMETERS.resize_window_callback = function() {
+				var canvas = document.getElementById("canvas");
+				var dpi = window.devicePixelRatio || 1;
+				var w = Math.max(1, Math.floor(window.innerWidth * dpi));
+				var h = Math.max(1, Math.floor(window.innerHeight * dpi));
+				if (canvas.width !== w) canvas.width = w;
+				if (canvas.height !== h) canvas.height = h;
+			};
+			// Zoom (Ctrl +/-) changes devicePixelRatio without a resize on some browsers.
+			window.addEventListener("resize", function() { CUSTOM_PARAMETERS.resize_window_callback(); });
+			document.addEventListener("fullscreenchange", function() { CUSTOM_PARAMETERS.resize_window_callback(); });
+		})();
+	</script>
+	<script id="engine-start" type="text/javascript">
+		if (window.location.href.startsWith("file://")) {
+			document.getElementById("loading").classList.add("done");
+			document.getElementById("running-from-file-warning").style.display = "flex";
+		} else if (!document.createElement("canvas").getContext("webgl2")) {
+			CUSTOM_PARAMETERS.unsupported_webgl_callback();
+		} else {
+			EngineLoader.load("canvas", "{{exe-name}}");
+		}
+	</script>
+</body>
+</html>