Misc Go interop fixes

.cargo/config.toml

@@ -0,0 +1,2 @@
+[alias]
+run-wasm = "run --release --package run-wasm --"

.vscode/settings.json

@@ -0,0 +1,7 @@
+{
+    // "go.lintTool": "golint"
+    "go.toolsEnvVars": {
+        "GOOS": "wasip1",
+        "GOARCH": "wasm"
+    }
+}

Cargo.toml

@@ -10,7 +10,9 @@ anyhow = "1.0.82"
 
 [workspace]
 members = [
+    "run-wasm",
     "crates/editor",
     "crates/minifb_host",
-    "crates/player"
+    "crates/player",
+    "crates/web_runner"
 ]

README.md

@@ -4,3 +4,12 @@ To launch the editor:
 $ cargo run --manifest-path crates\editor\Cargo.toml
 ```
 
+To run the web runner:
+```
+$ cargo run-wasm --manifest-path crates\web_runner\Cargo.toml --release --package web_runner
+```
+
+To build the web runner:
+```
+$ wasm-pack build crates\web_runner
+```

crates/editor/Cargo.toml

@@ -7,5 +7,6 @@ edition = "2021"
 
 [dependencies]
 anyhow = "1.0.82"
+minifb_host = { path = "../minifb_host" } 
 player = { path = "../player" } 
 viperid = { path = "../.." }

crates/editor/src/go_builder.rs

@@ -3,8 +3,7 @@ use std::{fs::File, io::Read, path::{Path, PathBuf}, process::Command};
 use viperid::VResult;
 
 pub struct GoBuilder {
-    project_directory: PathBuf,
-    entry_point: PathBuf
+    project_directory: PathBuf
 }
 
 impl GoBuilder {
@@ -27,15 +26,9 @@ impl GoBuilder {
             anyhow::bail!("project directory must exist: {}", project_directory.to_string_lossy())
         }
 
-        let entry_point = project_directory.join("main.go");
-        if !entry_point.exists() {
-            anyhow::bail!("entry point must exist: {}", entry_point.to_string_lossy())
-        }
-
         // OK, we should be able to do things with Go without any errors
         Ok(GoBuilder {
             project_directory: PathBuf::from(project_directory),
-            entry_point
         })
     }
 
@@ -47,24 +40,17 @@ impl GoBuilder {
                 self.project_directory.to_string_lossy()
             );
         }
-        if !self.entry_point.exists() {
-            anyhow::bail!(
-                "entry point disappeared: {}", 
-                self.entry_point.to_string_lossy()
-            );
-        }
 
-        let project_directory = &self.project_directory;
-        let entry_point = &self.entry_point;
-        let build_directory = project_directory.join("build");
+        let build_directory = self.project_directory.join("build");
         let wasm_name = build_directory.join("game.wasm");
 
         let mut child = Command::new("go")
-            .args(["build", "-o"]).arg(&wasm_name)
+            .arg("-C").arg(self.project_directory.clone())
+            .args(["build", "-o"]).arg("build/game.wasm")
             .env("GOOS", "wasip1")
             .env("GOARCH", "wasm")
             .arg("-trimpath")
-            .arg(entry_point)
+            .arg(".")
             .spawn()?;
         let status = child.wait()?;
         if !status.success() {

crates/editor/src/main.rs

@@ -1,5 +1,6 @@
 use std::path::PathBuf;
 
+use player::HOSTED_DEVICE;
 use viperid::VResult;
 
 use crate::go_builder::GoBuilder;
@@ -10,14 +11,14 @@ fn main() -> VResult<()> {
     let builder = GoBuilder::new(
         &PathBuf::from("example_project"))?;
     let wasm = builder.build()?;
+
     let mut executor = player::Executor::new(&wasm)?;
 
-    while executor.is_running() {
-        println!("update started");
+    minifb_host::host(HOSTED_DEVICE.with(|d| d.share()), || {
         executor.update();
-        println!("update completed");
         executor.get_error()?;
-    }
+        Ok(())
+    })?;
 
     Ok(())
 }

crates/minifb_host/Cargo.toml

@@ -6,3 +6,5 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+minifb = "0.25.0"
+viperid = { path = "../.." }

crates/minifb_host/src/lib.rs

@@ -0,0 +1,27 @@
+use minifb::{Window, WindowOptions};
+use viperid::{Device, VResult, SCREEN_H, SCREEN_W};
+
+pub fn host(
+    device: Device,
+    mut update: impl FnMut() -> VResult<()>
+) -> VResult<()> {
+    let mut window = Window::new(
+        "viperid",
+        SCREEN_W,
+        SCREEN_H,
+        WindowOptions::default()
+    )?;
+
+    // limit to 60FPS
+    window.limit_update_rate(Some(std::time::Duration::from_micros(16600)));
+
+    let mut buffer: Vec<u32> = vec![0; SCREEN_W * SCREEN_H];
+    while window.is_open() {
+        update()?;
+        device.shared.screen.to_bitmap(&mut buffer);
+
+        window.update_with_buffer(&buffer, SCREEN_W, SCREEN_H)?;
+    }
+
+    Ok(())
+}

crates/player/Cargo.toml

@@ -8,4 +8,5 @@ edition = "2021"
 [dependencies]
 anyhow = "1.0.82"
 viperid = { path = "../.." }
+wasm-timer = "0.2.5"
 wasmi = "0.31.2"

crates/player/src/engine_api.rs

@@ -3,15 +3,24 @@ use std::fmt::Display;
 use viperid::VResult;
 use wasmi::{core::{HostError, Trap}, Caller, Linker};
 
-use crate::executor::ExecutorState;
+use crate::{executor::ExecutorState, HOSTED_DEVICE};
 
 pub(crate) fn integrate(linker: &mut Linker<ExecutorState>) -> VResult<()> {
+    linker.func_wrap("viperid", "Pset", pset)?;
+
     linker.func_wrap("viperid", "YieldFrame", yield_frame)?;
 
     Ok(())
 }
 
-fn yield_frame(caller: Caller<ExecutorState>) -> Result<(), Trap> {
+fn pset(mut _caller: Caller<ExecutorState>, x: i32, y: i32, color: i32) -> Result<(), Trap> {
+    HOSTED_DEVICE.with(|dev| {
+        dev.shared.screen.pset(x, y, (color & 0xff) as u8);
+        Ok(())
+    })
+}
+
+fn yield_frame(_caller: Caller<ExecutorState>) -> Result<(), Trap> {
     Err(Trap::from(YieldFrame {}))
 }
 

crates/player/src/executor.rs

@@ -1,7 +1,7 @@
-use std::{fmt::Display, mem};
+use std::mem;
 
 use viperid::VResult;
-use wasmi::{core::{HostError, Trap}, Engine, Linker, Module, Store, TypedFunc, TypedResumableCall, TypedResumableInvocation};
+use wasmi::{core::Trap, Engine, Linker, Module, Store, TypedFunc, TypedResumableCall, TypedResumableInvocation};
 
 use crate::{engine_api::{self, YieldFrame}, wasi::{self, StockWasi}};
 
@@ -11,13 +11,13 @@ pub struct Executor {
 }
 
 pub(crate) struct ExecutorState {
-    wasi: wasi::StockWasi
+    wasi: wasi::StockWasi,
 }
 
 impl ExecutorState {
     fn new() -> Self {
         ExecutorState {
-            wasi: StockWasi::new()
+            wasi: StockWasi::new(),
         }
 
     }
@@ -34,7 +34,7 @@ impl Executor {
 
         let mut linker = <Linker<ExecutorState>>::new(&engine);
         wasi::integrate(&mut linker, |hs| &mut hs.wasi)?;
-        engine_api::integrate(&mut linker);
+        engine_api::integrate(&mut linker)?;
 
         let instance = linker
             .instantiate(&mut store, &module)?

crates/player/src/hosted_device.rs

@@ -0,0 +1,7 @@
+use std::thread_local;
+
+use viperid::Device;
+
+thread_local! {
+    pub static HOSTED_DEVICE: Device = Device::new();
+}

crates/player/src/lib.rs

@@ -1,5 +1,7 @@
 mod engine_api;
 mod executor;
 mod wasi;
+mod hosted_device;
 
-pub use executor::Executor;
+pub use executor::Executor;
+pub use hosted_device::HOSTED_DEVICE;

crates/player/src/wasi/implementation.rs

@@ -1,5 +1,3 @@
-use std::time::SystemTime;
-
 use wasmi::core::Trap;
 
 use super::MinimalPreview1;
@@ -50,7 +48,7 @@ impl MinimalPreview1 for StockWasi {
         println!("clock_time_get: {} {} {}", id, precision, outptr);
         // TODO: Actually fetch time
         let duration = 
-            SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)
+            wasm_timer::SystemTime::now().duration_since(wasm_timer::SystemTime::UNIX_EPOCH)
             .expect("time must be post-epoch");
 
         write_u64(memory, outptr, duration.as_nanos() as u64);

crates/web_runner/Cargo.toml

@@ -0,0 +1,30 @@
+[package]
+name = "web_runner"
+version = "0.1.0"
+edition = "2021"
+
+[build]
+target = "wasm32-unknown-unknown"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[features]
+optimize = ["log/release_max_level_warn"]
+default = ["optimize"]
+
+[dependencies]
+error-iter = "0.4"
+log = "0.4"
+pixels = "0.13.0"
+player = { path = "../player" } 
+viperid = { path = "../.." }
+
+winit = "0.28"
+winit_input_helper = "0.14"
+console_error_panic_hook = "0.1"
+console_log = "1"
+wasm-bindgen = "0.2"
+wasm-bindgen-futures = "0.4"
+web-sys = { version = "0.3", features = ["GpuTextureFormat"] }
+anyhow = "1.0.82"
+

crates/web_runner/src/main.rs

@@ -0,0 +1,128 @@
+use std::rc::Rc;
+
+use error_iter::ErrorIter as _;
+use log::error;
+use pixels::{Pixels, SurfaceTexture};
+use player::HOSTED_DEVICE;
+use viperid::{Device, VResult, SCREEN_H, SCREEN_W};
+// https://github.com/parasyte/pixels/blob/main/examples/minimal-web/src/main.rs
+use winit::{dpi::LogicalSize, event::Event, event_loop::{ControlFlow, EventLoop}, window::WindowBuilder};
+
+fn main() {
+    std::panic::set_hook(Box::new(console_error_panic_hook::hook));
+    console_log::init_with_level(log::Level::Trace).expect("error initializing logger");
+    wasm_bindgen_futures::spawn_local(run());
+}
+
+async fn run() {
+    let wasm = include_bytes!("../../../example_project/build/game.wasm");
+    let mut executor = 
+        player::Executor::new(wasm)
+        .expect("should have been able to create executor");
+
+    host(HOSTED_DEVICE.with(|d| d.share()), move || {
+        executor.update();
+        executor.get_error()?;
+        Ok(())
+    }).await.expect("error while hosting");
+}
+
+async fn host(
+    device: Device,
+    mut update: impl FnMut() -> VResult<()> + 'static
+) -> VResult<()> {
+    let event_loop = EventLoop::new();
+
+    let size = LogicalSize::new(SCREEN_W as f64, SCREEN_H as f64);
+    let window = WindowBuilder::new()
+        .with_title("viperid")
+        .with_inner_size(size)
+        .with_min_inner_size(size)
+        .build(&event_loop)
+        .expect("WindowBuilder error");
+    let window = Rc::new(window);
+
+    #[cfg(target_arch = "wasm32")]
+    {
+        use wasm_bindgen::JsCast;
+        use winit::platform::web::WindowExtWebSys;
+
+        // Retrieve current width and height dimensions of browser client window
+        let get_window_size = || {
+            let client_window = web_sys::window().unwrap();
+            LogicalSize::new(
+                client_window.inner_width().unwrap().as_f64().unwrap(),
+                client_window.inner_height().unwrap().as_f64().unwrap(),
+            )
+        };
+
+        let window = Rc::clone(&window);
+
+        // Initialize winit window with current dimensions of browser client
+        // window.set_inner_size(get_window_size());
+
+        let client_window = web_sys::window().unwrap();
+
+        // Attach winit canvas to body element
+        web_sys::window()
+            .and_then(|win| win.document())
+            .and_then(|doc| doc.body())
+            .and_then(|body| {
+                body.append_child(&web_sys::Element::from(window.canvas()))
+                    .ok()
+            })
+            .expect("couldn't append canvas to document body");
+
+            /*
+        // Listen for resize event on browser client. Adjust winit window dimensions
+        // on event trigger
+        let closure = wasm_bindgen::closure::Closure::wrap(Box::new(move |_e: web_sys::Event| {
+            let size = get_window_size();
+            window.set_inner_size(size)
+        }) as Box<dyn FnMut(_)>);
+        client_window
+            .add_event_listener_with_callback("resize", closure.as_ref().unchecked_ref())
+            .unwrap();
+        closure.forget();
+        */
+    }
+
+    // let mut input = WinitInputHelper::new();
+    let mut pixels = {
+        let window_size = window.inner_size();
+        let surface_texture = 
+            SurfaceTexture::new(window_size.width, window_size.height, window.as_ref());
+        Pixels::new_async(SCREEN_W as u32, SCREEN_H as u32, surface_texture).await.expect("Pixels error")
+    };
+
+    event_loop.run(move |event, _, control_flow| {
+        if let Event::RedrawRequested(_) = event {
+            let frame = pixels.frame_mut();
+            if let Err(err) = update() {
+                log_anyhow_error("update", err);
+                *control_flow = ControlFlow::Exit;
+                return;
+            }
+            device.shared.screen.to_bitmap_slice(frame).expect("to_bitmap_slice error");
+            if let Err(err) = pixels.render() {
+                log_error("pixels.render", err);
+                *control_flow = ControlFlow::Exit;
+                return;
+            }
+        }
+
+        window.request_redraw();
+    })
+}
+
+fn log_error<E: std::error::Error + 'static>(method_name: &str, err: E) {
+    error!("{method_name}() failed: {err}");
+    for source in err.sources().skip(1) {
+        error!("  Caused by: {source}");
+    }
+}
+
+
+fn log_anyhow_error(method_name: &str, err: anyhow::Error) {
+    error!("{method_name}() failed: {err}");
+}

example_project/go.work

@@ -1 +1,3 @@
 go 1.21.5
+
+use .

example_project/main.go

@@ -1,21 +1,25 @@
 package main
 
-import (
-	"fmt"
-)
+import "example_project/viperid"
 
 func main() {
-	count := 0
+	t := 0
 	for {
-		fmt.Printf("Hello! %d", count)
-		count++
+		for y := 0; y < 120; y++ {
+			for x := 0; x < 160; x++ {
+				viperid.Pset(
+					x,
+					y,
+					(x+y+t)%64,
+				)
+			}
+		}
+		// fmt.Printf("Hello! %d", count)
+		// count++
 		/*
 			debug.PrintStack()
 		*/
-		YieldFrame()
+		viperid.YieldFrame()
+		t += 1
 	}
 }
-
-//go:wasmimport viperid YieldFrame
-//go:noescape
-func YieldFrame()

example_project/viperid/exports.go

@@ -0,0 +1,13 @@
+package viperid
+
+func YieldFrame() {
+	yieldFrame()
+}
+
+func Pset(x int, y int, color int) {
+	pset(int32(x), int32(y), int32(color))
+}
+
+func Pget(x int, y int) int {
+	return int(pget(int32(x), int32(y)))
+}

example_project/viperid/imports.go

@@ -0,0 +1,15 @@
+//lint:file-ignore U1000 Ignore all unused code, it's generated
+
+package viperid
+
+//go:wasmimport viperid YieldFrame
+//go:noescape
+func yieldFrame()
+
+//go:wasmimport viperid Pset
+//go:noescape
+func pset(x int32, y int32, color int32)
+
+//go:wasmimport viperid Pget
+//go:noescape
+func pget(x int32, y int32) int32

run-wasm/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "run-wasm"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+cargo-run-wasm = "0.3"

run-wasm/src/main.rs

@@ -0,0 +1,9 @@
+fn main() {
+    let css = r#"body {
+        background-color: #000;
+        margin: 0;
+        overflow: hidden;
+    }"#;
+
+    cargo_run_wasm::run_wasm_with_css(css);
+}

slop/palette/index.mjs

@@ -149,6 +149,11 @@ function generateColors() {
     return colors;
 }
 
+function clamp(x) {
+    if (x < 0.0) { return 0.0; }
+    if (x > 255.0) { return 255.0; }
+    return Math.round(x);
+}
 
 function dump(fname, colors, width, height, scalar) {
     if (colors.length != width * height) {
@@ -156,12 +161,6 @@ function dump(fname, colors, width, height, scalar) {
     }
     let pngdata = [];
 
-    let clamp = function(x) {
-        if (x < 0.0) { return 0.0; }
-        if (x > 255.0) { return 255.0; }
-        return Math.round(x);
-    }
-
     for (var y = 0; y < height * scalar; y++) {
         for (var x = 0; x < width * scalar; x++) {
             let i = Math.floor(y / scalar) * width + Math.floor(x / scalar);
@@ -181,4 +180,25 @@ function dump(fname, colors, width, height, scalar) {
     png.pack().pipe(fs.createWriteStream(fname));
 }
 
-dump("palette.png", generateColors(), 8, 8, 64);
+function dumpRust(fname, colors) {
+    var paletteString = "";
+    paletteString += "pub const PALETTE: [u32; " + palette.length + "] = [\n"
+    for (var i = 0; i < colors.length; i++) {
+        var c = colors[i];
+        paletteString += (
+            "    " +
+            (
+                clamp(255 * c.srgb.r) * 256 * 256 + 
+                clamp(255 * c.srgb.g) * 256 + 
+                clamp(255 * c.srgb.b) 
+            ) +
+            ",\n"
+        );
+    }
+    paletteString += "];\n"
+    fs.writeFileSync(fname, paletteString);
+}
+
+var palette = generateColors();
+dump("palette.png", palette, 8, 8, 64);
+dumpRust("../../src/palette.rs", palette)

src/device.rs

@@ -0,0 +1,35 @@
+use std::rc::Rc;
+
+use crate::screen::Screen;
+
+pub struct DeviceT {
+    pub screen: Screen
+}
+
+impl DeviceT {
+    fn new() -> Self {
+        let screen = Screen::new();
+
+        DeviceT {
+            screen
+        }
+    }
+}
+
+pub struct Device {
+    pub shared: Rc<DeviceT>
+}
+
+impl Device {
+    pub fn new() -> Self {
+        return Device {
+            shared: Rc::new(DeviceT::new())
+        }
+    }
+
+    pub fn share(&self) -> Self {
+        return Device {
+            shared: self.shared.clone()
+        }
+    }
+}

src/lib.rs

@@ -1 +1,9 @@
+mod device;
+mod palette;
+mod screen;
+
+pub use device::Device;
+pub use palette::PALETTE;
+pub use screen::{Screen, SCREEN_W, SCREEN_H};
+
 pub type VResult<T> = Result<T, anyhow::Error>;

src/palette.rs

@@ -0,0 +1,66 @@
+pub const PALETTE: [u32; 64] = [
+    0,
+    255,
+    65280,
+    65535,
+    16711680,
+    16711935,
+    16776960,
+    16777215,
+    2108716,
+    2702403,
+    1185312,
+    2630193,
+    1773853,
+    3549743,
+    3023127,
+    4340779,
+    2579604,
+    3625835,
+    7220570,
+    5190218,
+    8546100,
+    6575428,
+    5277013,
+    5794384,
+    3896270,
+    5008537,
+    10827122,
+    8144483,
+    12360982,
+    10127705,
+    3785353,
+    7184769,
+    2604031,
+    8078320,
+    12206769,
+    15678544,
+    16755248,
+    12254976,
+    4587379,
+    192996,
+    9879295,
+    12153314,
+    14448303,
+    16352853,
+    15912050,
+    12779380,
+    6619053,
+    6943484,
+    13216248,
+    14533092,
+    16424079,
+    15779252,
+    15134089,
+    15332289,
+    7667178,
+    11991026,
+    15982318,
+    15590636,
+    16706528,
+    16118256,
+    16121569,
+    16449014,
+    13892346,
+    15136756,
+];

src/screen.rs

@@ -0,0 +1,62 @@
+use std::cell::RefCell;
+
+use crate::{VResult, PALETTE};
+
+pub const SCREEN_W: usize = 640;
+pub const SCREEN_H: usize = 480;
+
+const PIXEL_SCALAR: usize = 4;
+// const CURSES_SNAP: usize = 8;
+
+pub struct Screen {
+    // NOTE: There are better data structures we could use than this
+    pixels: RefCell<Vec<u8>>
+}
+
+impl Screen {
+    pub fn new() -> Screen {
+        Screen {
+            pixels: RefCell::new(vec![0; SCREEN_W * SCREEN_H])
+        }
+    }
+
+    pub fn to_bitmap(&self, bitmap: &mut Vec<u32>) {
+        bitmap.resize(SCREEN_W * SCREEN_H, 0);
+
+        let pxl = self.pixels.borrow();
+        for i in 0..pxl.len() {
+            bitmap[i] = PALETTE[pxl[i] as usize];
+        }
+    }
+
+    pub fn to_bitmap_slice(&self, slice: &mut [u8]) -> VResult<()> {
+        if slice.len() != SCREEN_W * SCREEN_H * 4 {
+            anyhow::bail!("slice should be {} x {} in length", SCREEN_W, SCREEN_H);
+        }
+
+        let pxl = self.pixels.borrow();
+        for i in 0..pxl.len() {
+            slice[i * 4..i * 4 + 4].copy_from_slice(&(0xff000000 | PALETTE[pxl[i] as usize]).to_le_bytes());
+        }
+        Ok(())
+    }
+
+    pub fn pset(&self, x: i32, y: i32, color: u8) {
+        let px0 = x * PIXEL_SCALAR as i32;
+        let py0 = y * PIXEL_SCALAR as i32;
+
+        if px0 < 0 || py0 < 0 || px0 >= SCREEN_W as i32 || py0 >= SCREEN_H as i32 {
+            return;
+        }
+
+        let px0 = px0 as usize;
+        let py0 = py0 as usize;
+
+        let mut pxl = self.pixels.borrow_mut();
+        for py in py0..py0 + PIXEL_SCALAR {
+            for px in px0..px0 + PIXEL_SCALAR {
+                pxl[py * SCREEN_W + px] = color;
+            } 
+        }
+    }
+}