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hook up logging to wasm, example uses new zig-js package

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This commit is contained in:
Mitchell Hashimoto 2022-12-04 13:16:54 -08:00
parent 437f1772f1
commit c48d8cd151
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9 changed files with 4547 additions and 48 deletions
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4
example/.gitignore vendored Normal file
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@ -0,0 +1,4 @@
.parcel-cache/
dist/
node_modules/
example.wasm*

49
example/app.ts Normal file
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@ -0,0 +1,49 @@
import { ZigJS } from 'zig-js';
const zjs = new ZigJS();
const importObject = {
module: {},
env: {
log: (ptr: number, len: number) => {
const view = new DataView(zjs.memory.buffer, ptr, Number(len));
const str = new TextDecoder('utf-8').decode(view);
console.log(str);
},
},
...zjs.importObject(),
};
const url = new URL('ghostty-wasm.wasm', import.meta.url);
fetch(url.href).then(response =>
response.arrayBuffer()
).then(bytes =>
WebAssembly.instantiate(bytes, importObject)
).then(results => {
const {
memory,
malloc,
free,
face_new,
face_free,
} = results.instance.exports;
// Give us access to the zjs value for debugging.
globalThis.zjs = zjs;
console.log(zjs);
// Initialize our zig-js memory
zjs.memory = memory;
// Create some memory for our string
const font = new TextEncoder().encode("monospace");
const font_ptr = malloc(font.byteLength);
try {
new Uint8Array(memory.buffer, font_ptr).set(font);
// Call whatever example you want:
const face = face_new(font_ptr, font.byteLength);
face_free(face);
} finally {
free(font_ptr);
}
});

45
example/index.html
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@ -1,36 +1,11 @@
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WASM Example</title>
</head>
<body>
<script>
const importObject = {
module: {},
env: {
// memory: new WebAssembly.Memory({ initial: 256 }),
}
};
fetch('ghostty-wasm.wasm').then(response =>
response.arrayBuffer()
).then(bytes =>
WebAssembly.instantiate(bytes, importObject)
).then(results => {
const {
atlas_new,
atlas_free,
atlas_reserve,
free,
memory,
} = results.instance.exports;
const atlas = atlas_new(512, 0);
const reg = atlas_reserve(atlas, 10, 10);
free(reg);
atlas_free(atlas);
});
</script>
</body>
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<title>Ghostty Example</title>
<script type="module" src="app.ts"></script>
</head>
<body>
Open your console, we are just debugging here.
</body>
</html>

4436
example/package-lock.json generated Normal file
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22
example/package.json Normal file
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@ -0,0 +1,22 @@
{
"name": "ghostty example",
"version": "0.1.0",
"description": "Example showing ghostty and wasm.",
"source": "index.html",
"browserslist": "> 0.5%, last 2 versions, not dead",
"scripts": {
"start": "parcel",
"build": "parcel build",
"check": "tsc --noEmit"
},
"author": "Mitchell Hashimoto",
"license": "MIT",
"devDependencies": {
"@parcel/transformer-inline-string": "^2.8.0",
"parcel": "^2.8.0",
"typescript": "^4.9.3"
},
"dependencies": {
"zig-js": "file:../vendor/zig-js/js"
}
}

2
src/font/face/web_canvas.zig
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@ -49,6 +49,8 @@ pub const Face = struct {
const canvas = try doc.call(js.Object, "createElement", .{js.string("canvas")});
errdefer canvas.deinit();
log.debug("face initialized: {s}", .{raw});
return Face{
.alloc = alloc,
.font_str = font_str,

11
src/main_wasm.zig
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@ -1,6 +1,17 @@
// This is the main file for the WASM module. The WASM module has to
// export a C ABI compatible API.
const std = @import("std");
const builtin = @import("builtin");
pub usingnamespace @import("os/wasm.zig");
pub usingnamespace @import("os/wasm/log.zig");
pub usingnamespace @import("font/main.zig");
// Set our log level. We try to get as much logging as possible but in
// ReleaseSmall mode where we're optimizing for space, we elevate the
// log level.
pub const log_level: std.log.Level = switch (builtin.mode) {
.Debug => .debug,
.ReleaseSmall => .warn,
else => .info,
};

24
src/os/wasm.zig
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@ -37,6 +37,18 @@ pub export fn malloc(len: usize) ?[*]u8 {
return alloc_(len) catch return null;
}
fn alloc_(len: usize) ![*]u8 {
// Create the allocation
const slice = try alloc.alloc(u8, len);
errdefer alloc.free(slice);
// Store the size so we can deallocate later
try allocs.putNoClobber(alloc, slice.ptr, slice.len);
errdefer _ = allocs.remove(slice.ptr);
return slice.ptr;
}
/// Free an allocation from malloc.
pub export fn free(ptr: ?[*]u8) void {
if (ptr) |v| {
@ -79,18 +91,6 @@ pub fn toModuleOwned(ptr: anytype) void {
_ = allocs.remove(casted);
}
fn alloc_(len: usize) ![*]u8 {
// Create the allocation
const slice = try alloc.alloc(u8, len);
errdefer alloc.free(slice);
// Store the size so we can deallocate later
try allocs.putNoClobber(alloc, slice.ptr, slice.len);
errdefer _ = allocs.remove(slice.ptr);
return slice.ptr;
}
test "basics" {
const testing = std.testing;
var buf = malloc(32).?;

2
vendor/zig-js vendored

@ -1 +1 @@
Subproject commit a6d0b5a0c421925409f1bce542f64b9e5f6b96df
Subproject commit faa353da8aca78269bc7d2afaf481b755007e849