holy shit it works

gb-vst/src/lib.rs

@@ -6,16 +6,13 @@ use gb_emu_lib::{
 };
 use nih_plug::prelude::*;
 use std::sync::{
-    mpsc::{channel, Sender},
-    Arc,
+    mpsc::{channel, Receiver, Sender},
+    Arc, Mutex,
 };
 use ui::{Emulator, EmulatorRenderer};
 
 mod ui;
 
-const WIDTH: u32 = 320;
-const HEIGHT: u32 = 240;
-
 #[derive(Params, Default)]
 struct EmuParams {}
 
@@ -28,6 +25,7 @@ struct EmuVars {
 #[derive(Default)]
 pub struct GameboyEmu {
     vars: Option<EmuVars>,
+    frame_receiver: Arc<Mutex<Option<Receiver<Vec<u32>>>>>,
 }
 
 const ROM: &[u8; 32768] = include_bytes!("../../test-roms/Tetris.gb");
@@ -89,7 +87,7 @@ impl Plugin for GameboyEmu {
     }
 
     fn editor(&self, _: AsyncExecutor<Self>) -> Option<Box<dyn Editor>> {
-        Some(Box::new(Emulator::new()))
+        Some(Box::new(Emulator::new(self.frame_receiver.clone())))
     }
 
     fn initialize(
@@ -111,9 +109,12 @@ impl Plugin for GameboyEmu {
 
         let (output, rx) = AudioOutput::new_unfilled(buffer_config.sample_rate);
 
-        let renderer = Box::<EmulatorRenderer>::default();
+        let (renderer, frame_receiver) = EmulatorRenderer::new();
 
-        let mut emulator_core = EmulatorCore::init(receiver, options, renderer, output, None);
+        *self.frame_receiver.lock().unwrap() = Some(frame_receiver);
+
+        let mut emulator_core =
+            EmulatorCore::init(receiver, options, Box::new(renderer), output, None);
         emulator_core.run_until_buffer_full();
 
         self.vars = Some(EmuVars {

gb-vst/src/ui.rs

@@ -1,20 +1,25 @@
-use std::sync::Arc;
+use std::sync::{
+    mpsc::{self, Receiver, Sender},
+    Arc, Mutex,
+};
 
 use baseview::{
-    Event, EventStatus, MouseButton, MouseEvent, Size, Window, WindowEvent, WindowHandler,
-    WindowInfo, WindowOpenOptions,
+    Event, EventStatus, Size, Window, WindowEvent, WindowHandler, WindowInfo, WindowOpenOptions,
+};
+use gb_emu_lib::{
+    connect::{Renderer, HEIGHT, WIDTH},
+    util::scale_buffer,
 };
-use gb_emu_lib::connect::Renderer;
 use nih_plug::prelude::*;
 use pixels::{Pixels, SurfaceTexture};
 
-use crate::{HEIGHT, WIDTH};
-
-pub struct Emulator {}
+pub struct Emulator {
+    frame_receiver: Arc<Mutex<Option<Receiver<Vec<u32>>>>>,
+}
 
 impl Emulator {
-    pub fn new() -> Self {
-        Self {}
+    pub fn new(frame_receiver: Arc<Mutex<Option<Receiver<Vec<u32>>>>>) -> Self {
+        Self { frame_receiver }
     }
 }
 
@@ -24,6 +29,7 @@ impl Editor for Emulator {
         parent: ParentWindowHandle,
         _context: Arc<dyn GuiContext>,
     ) -> Box<dyn std::any::Any + Send> {
+        let cloned = self.frame_receiver.clone();
         Window::open_parented(
             &parent,
             WindowOpenOptions {
@@ -32,13 +38,13 @@ impl Editor for Emulator {
                 scale: baseview::WindowScalePolicy::SystemScaleFactor,
                 gl_config: None,
             },
-            EmulatorWindow::new,
+            |w| EmulatorWindow::new(w, cloned),
         );
-        Box::new(Self::new())
+        Box::new(Self::new(self.frame_receiver.clone()))
     }
 
     fn size(&self) -> (u32, u32) {
-        (WIDTH, HEIGHT)
+        (WIDTH as u32, HEIGHT as u32)
     }
 
     fn set_scale_factor(&self, _factor: f32) -> bool {
@@ -54,84 +60,87 @@ impl Editor for Emulator {
 
 pub struct EmulatorWindow {
     pix: Pixels,
-    current_colour: [u8; 4],
+    scale: usize,
+    frame_receiver: Arc<Mutex<Option<Receiver<Vec<u32>>>>>,
 }
 
 impl EmulatorWindow {
-    fn new(window: &mut Window) -> Self {
+    fn new(window: &mut Window, frame_receiver: Arc<Mutex<Option<Receiver<Vec<u32>>>>>) -> Self {
         let info = WindowInfo::from_logical_size(Size::new(WIDTH as f64, HEIGHT as f64), 1.);
 
-        let mut pix = init_pixbuf(info, window);
-
-        let current_colour: [u8; 4] = [0xFF, 0x0, 0x0, 0xFF];
-
-        for pixel in pix.get_frame_mut().chunks_exact_mut(4) {
-            pixel.copy_from_slice(&current_colour);
-        }
+        let (pix, scale) = init_pixbuf(info, window);
 
         Self {
             pix,
-            current_colour,
-        }
-    }
-
-    fn update_pixbuf(&mut self) {
-        self.current_colour = rotate_colour(&self.current_colour);
-        self.render_pixbuf();
-    }
-
-    fn render_pixbuf(&mut self) {
-        for pixel in self.pix.get_frame_mut().chunks_exact_mut(4) {
-            pixel.copy_from_slice(&self.current_colour);
+            scale,
+            frame_receiver,
         }
     }
 }
 
-fn init_pixbuf(info: WindowInfo, window: &mut Window) -> Pixels {
+fn init_pixbuf(info: WindowInfo, window: &mut Window) -> (Pixels, usize) {
     let physical_size = info.physical_size();
+    let scale = (physical_size.width as usize / WIDTH).min(physical_size.height as usize / HEIGHT);
+    (
         pixels::Pixels::new(
             physical_size.width,
             physical_size.height,
             SurfaceTexture::new(physical_size.width, physical_size.height, window),
         )
-    .unwrap()
-}
-
-fn rotate_colour(current: &[u8; 4]) -> [u8; 4] {
-    [current[1], current[2], current[0], current[3]]
+        .unwrap(),
+        scale,
+    )
 }
 
 impl WindowHandler for EmulatorWindow {
     fn on_frame(&mut self, _window: &mut Window) {
+        if let Some(ref mut receiver) = *self.frame_receiver.lock().expect("failed to lock mutex") {
+            match receiver.recv() {
+                Ok(buf) => {
+                    let scaled_buf = if self.scale != 1 {
+                        scale_buffer(&buf, WIDTH, HEIGHT, self.scale)
+                    } else {
+                        buf
+                    };
+                    for (pixel, source) in
+                        self.pix.get_frame_mut().chunks_exact_mut(4).zip(scaled_buf)
+                    {
+                        pixel.copy_from_slice(&source.to_be_bytes());
+                    }
                     self.pix.render().unwrap();
                 }
+                Err(e) => nih_log!("recv error: {e}"),
+            }
+        }
+    }
 
     fn on_event(&mut self, window: &mut Window, event: baseview::Event) -> EventStatus {
         if let Event::Window(WindowEvent::Resized(info)) = event {
-            self.pix = init_pixbuf(info, window);
-            self.update_pixbuf();
-            return EventStatus::Captured;
-        }
-        if let Event::Mouse(MouseEvent::ButtonPressed {
-            button: MouseButton::Left,
-            ..
-        }) = event
-        {
-            nih_log!("nih click!");
-            self.update_pixbuf();
+            (self.pix, self.scale) = init_pixbuf(info, window);
             return EventStatus::Captured;
         }
         EventStatus::Ignored
     }
 }
 
-#[derive(Default)]
-pub struct EmulatorRenderer {}
+pub struct EmulatorRenderer {
+    tx: Sender<Vec<u32>>,
+}
+
+impl EmulatorRenderer {
+    pub(super) fn new() -> (Self, Receiver<Vec<u32>>) {
+        let (tx, rx) = mpsc::channel::<Vec<u32>>();
+        (Self { tx }, rx)
+    }
+}
 
 impl Renderer for EmulatorRenderer {
     fn prepare(&mut self, _width: usize, _height: usize) {}
 
-    fn display(&mut self, _buffer: &[u32]) {}
+    #[allow(unused_must_use)]
+    fn display(&mut self, buffer: &[u32]) {
+        self.tx.send(buffer.to_vec());
+    }
 
     fn latest_joypad_state(&mut self) -> gb_emu_lib::connect::JoypadState {
         gb_emu_lib::connect::JoypadState::default()