vst works (but not really)

gb-vst/src/lib.rs

@@ -1,6 +1,15 @@
+use async_ringbuf::AsyncHeapConsumer;
+use futures::executor;
+use gb_emu_lib::{
+    connect::{AudioOutput, EmulatorMessage, RomFile},
+    EmulatorCore,
+};
 use nih_plug::prelude::*;
-use std::sync::Arc;
-use ui::Emulator;
+use std::sync::{
+    mpsc::{channel, Sender},
+    Arc,
+};
+use ui::{Emulator, EmulatorRenderer};
 
 mod ui;
 
@@ -10,8 +19,18 @@ const HEIGHT: u32 = 240;
 #[derive(Params, Default)]
 struct EmuParams {}
 
+struct EmuVars {
+    rx: AsyncHeapConsumer<[f32; 2]>,
+    sender: Sender<EmulatorMessage>,
+    emulator_core: EmulatorCore,
+}
+
 #[derive(Default)]
-struct GameboyEmu {}
+pub struct GameboyEmu {
+    vars: Option<EmuVars>,
+}
+
+const ROM: &[u8; 32768] = include_bytes!("../../test-roms/Tetris.gb");
 
 impl Plugin for GameboyEmu {
     const NAME: &'static str = "Gameboy";
@@ -47,11 +66,40 @@ impl Plugin for GameboyEmu {
 
     fn process(
         &mut self,
-        _buffer: &mut Buffer,
+        buffer: &mut Buffer,
         _: &mut AuxiliaryBuffers,
         _: &mut impl ProcessContext<Self>,
     ) -> ProcessStatus {
-        ProcessStatus::Normal
+        nih_log!("processing");
+        if let Some(ref mut vars) = self.vars {
+            vars.emulator_core.run_until_buffer_full();
+            if buffer.channels() != 2 {
+                panic!()
+            }
+            let mut got_any = false;
+            let mut got_nonzero = false;
+            for sample in buffer.iter_samples() {
+                if let Some(a) = executor::block_on(vars.rx.pop()) {
+                    got_any = true;
+                    if (a[0] != 0.) || (a[1] != 0.) {
+                        got_nonzero = true;
+                    }
+                    for (source, dest) in a.iter().zip(sample) {
+                        *dest = *source;
+                    }
+                }
+            }
+            if got_any {
+                if got_nonzero {
+                    nih_log!("got some real data");
+                } else {
+                    nih_log!("got some 0's");
+                }
+            }
+        } else {
+            nih_log!("vars not initialised");
+        }
+        ProcessStatus::KeepAlive
     }
 
     fn editor(&self, _: AsyncExecutor<Self>) -> Option<Box<dyn Editor>> {
@@ -61,11 +109,45 @@ impl Plugin for GameboyEmu {
     fn initialize(
         &mut self,
         _audio_io_layout: &AudioIOLayout,
-        _buffer_config: &BufferConfig,
+        buffer_config: &BufferConfig,
         _context: &mut impl InitContext<Self>,
     ) -> bool {
+        let options = gb_emu_lib::Options {
+            rom: RomFile::Raw(ROM.to_vec()),
+            save_path: None,
+            no_save: true,
+            bootrom_path: None,
+            connect_serial: false,
+            verbose: true,
+            cycle_count: false,
+        };
+        let (sender, receiver) = channel::<EmulatorMessage>();
+
+        let (output, rx) = AudioOutput::new_unfilled(buffer_config.sample_rate);
+
+        let renderer = Box::<EmulatorRenderer>::default();
+
+        let mut emulator_core = EmulatorCore::init(receiver, options, renderer, output, None);
+        emulator_core.run_until_buffer_full();
+
+        self.vars = Some(EmuVars {
+            rx,
+            sender,
+            emulator_core,
+        });
+
         true
     }
+
+    fn deactivate(&mut self) {
+        nih_log!("deactivating");
+        if let Some(ref mut vars) = self.vars {
+            match vars.sender.send(EmulatorMessage::Stop) {
+                Ok(_) => self.vars = None,
+                Err(e) => nih_log!("error {e} sending message to emulator"),
+            }
+        }
+    }
 }
 
 impl Vst3Plugin for GameboyEmu {

lib/src/connect/mod.rs

@@ -11,7 +11,7 @@ pub enum RomFile {
     Raw(Vec<u8>),
 }
 
-pub trait Renderer {
+pub trait Renderer: Send + Sync {
     fn prepare(&mut self, width: usize, height: usize);
 
     fn display(&mut self, buffer: &[u32]);
@@ -30,12 +30,23 @@ pub struct AudioOutput {
 
 impl AudioOutput {
     pub fn new(sample_rate: f32) -> (Self, AsyncHeapConsumer<[f32; 2]>) {
+        let (mut output, rx) = Self::new_unfilled(sample_rate);
+
+        executor::block_on(
+            output
+                .send_rb
+                .push_iter(vec![[0.; 2]; output.send_rb.len() - 1].into_iter()),
+        )
+        .unwrap();
+
+        (output, rx)
+    }
+
+    pub fn new_unfilled(sample_rate: f32) -> (Self, AsyncHeapConsumer<[f32; 2]>) {
         let rb_len = sample_rate as usize / (60 * 2);
 
         let rb = AsyncHeapRb::<[f32; 2]>::new(rb_len);
-        let (mut send_rb, rx) = rb.split();
-
-        executor::block_on(send_rb.push_iter(vec![[0.; 2]; rb_len - 1].into_iter())).unwrap();
+        let (send_rb, rx) = rb.split();
 
         (
             Self {

lib/src/lib.rs

@@ -154,6 +154,7 @@ impl EmulatorCore {
     }
 
     pub fn run_until_buffer_full(&mut self) {
+        println!("running until buffer full!!");
         while !self.cpu.memory.is_audio_buffer_full() {
             loop {
                 self.run();

lib/src/processor/memory/mmio/apu.rs

@@ -111,6 +111,7 @@ impl Apu {
                 .map(|v| v.mixed(&self.mixer))
                 .collect::<Vec<[f32; 2]>>(),
         );
+        println!("pushing {} samples to queue", converted.len());
         executor::block_on(self.output.send_rb.push_slice(&converted)).unwrap();
     }
 

lib/src/processor/memory/rom/mbcs.rs

@@ -15,7 +15,7 @@ pub(super) const KB: usize = 1024;
 const ROM_BANK_SIZE: usize = 16 * KB;
 const RAM_BANK_SIZE: usize = 8 * KB;
 
-pub(super) trait Mbc {
+pub(super) trait Mbc: Send + Sync {
     // addresses 0x0000 - 0x7FFF
     fn get(&self, address: Address) -> u8;
     // addresses 0xA000 - 0xBFFF