Partially implement clap_plugin

src/wrapper/clap/plugin.rs

@@ -1,13 +1,14 @@
 use clap_sys::host::clap_host;
 use clap_sys::plugin::clap_plugin;
 use clap_sys::process::{clap_process, clap_process_status};
+use crossbeam::atomic::AtomicCell;
 use parking_lot::RwLock;
 use std::ffi::c_void;
 use std::os::raw::c_char;
 use std::ptr;
 
 use super::descriptor::PluginDescriptor;
-use crate::plugin::ClapPlugin;
+use crate::plugin::{BufferConfig, BusConfig, ClapPlugin};
 
 #[repr(C)]
 pub struct Plugin<P: ClapPlugin> {
@@ -17,6 +18,13 @@ pub struct Plugin<P: ClapPlugin> {
     /// The wrapped plugin instance.
     plugin: RwLock<P>,
 
+    /// The current IO configuration, modified through the `clap_plugin_audio_ports_config`
+    /// extension.
+    current_bus_config: AtomicCell<BusConfig>,
+    /// The current buffer configuration, containing the sample rate and the maximum block size.
+    /// Will be set in `clap_plugin::activate()`.
+    pub current_buffer_config: AtomicCell<Option<BufferConfig>>,
+
     host_callback: *const clap_host,
     /// Needs to be boxed because the plugin object is supposed to contain a static reference to
     /// this.
@@ -49,6 +57,11 @@ impl<P: ClapPlugin> Plugin<P> {
             },
 
             plugin: RwLock::new(P::default()),
+            current_bus_config: AtomicCell::new(BusConfig {
+                num_input_channels: P::DEFAULT_NUM_INPUTS,
+                num_output_channels: P::DEFAULT_NUM_OUTPUTS,
+            }),
+            current_buffer_config: AtomicCell::new(None),
 
             host_callback,
             plugin_descriptor,
@@ -57,41 +70,82 @@ impl<P: ClapPlugin> Plugin<P> {
 }
 
 impl<P: ClapPlugin> Plugin<P> {
-    unsafe extern "C" fn init(plugin: *const clap_plugin) -> bool {
+    // pub fn make_process_context(&self) -> WrapperProcessContext<'_, P> {
-        todo!();
+    //     WrapperProcessContext {
+    //         plugin: self,
+    //         input_events_guard: self.input_events.write(),
+    //     }
+    // }
+
+    unsafe extern "C" fn init(_plugin: *const clap_plugin) -> bool {
+        // We don't need any special initialization
+        true
     }
+
     unsafe extern "C" fn destroy(plugin: *const clap_plugin) {
-        todo!();
+        Box::from_raw(plugin as *mut Self);
     }
+
     unsafe extern "C" fn activate(
         plugin: *const clap_plugin,
         sample_rate: f64,
         min_frames_count: u32,
         max_frames_count: u32,
     ) -> bool {
+        let plugin = &*(plugin as *const Self);
+
+        let bus_config = plugin.current_bus_config.load();
+        let buffer_config = BufferConfig {
+            sample_rate: sample_rate as f32,
+            max_buffer_size: max_frames_count,
+        };
+
+        // TODO: Reset smoothers
+
         todo!();
+        // if plugin.plugin.write().initialize(
+        //     &bus_config,
+        //     &buffer_config,
+        //     plugin.make_process_context(),
+        // ) {
+        //     // TODO: Allocate buffer slices
+
+        //     // Also store this for later, so we can reinitialize the plugin after restoring state
+        //     plugin.current_buffer_config.store(Some(buffer_config));
+
+        //     true
+        // } else {
+        //     false
+        // }
     }
-    unsafe extern "C" fn deactivate(plugin: *const clap_plugin) {
+
-        todo!();
+    unsafe extern "C" fn deactivate(_plugin: *const clap_plugin) {
+        // We currently don't do anything here
     }
-    unsafe extern "C" fn start_processing(plugin: *const clap_plugin) -> bool {
+
-        todo!();
+    unsafe extern "C" fn start_processing(_plugin: *const clap_plugin) -> bool {
+        // We currently don't do anything here
+        true
     }
-    unsafe extern "C" fn stop_processing(plugin: *const clap_plugin) {
+
-        todo!();
+    unsafe extern "C" fn stop_processing(_plugin: *const clap_plugin) {
+        // We currently don't do anything here
     }
+
     unsafe extern "C" fn process(
         plugin: *const clap_plugin,
         process: *const clap_process,
     ) -> clap_process_status {
         todo!();
     }
+
     unsafe extern "C" fn get_extension(
         plugin: *const clap_plugin,
         id: *const c_char,
     ) -> *const c_void {
         todo!();
     }
+
     unsafe extern "C" fn on_main_thread(plugin: *const clap_plugin) {
         todo!();
     }