Generate VST3 entry point functions

Cargo.lock

@@ -13,6 +13,9 @@ dependencies = [
 [[package]]
 name = "nih_plug"
 version = "0.1.0"
+dependencies = [
+ "vst3-sys",
+]
 
 [[package]]
 name = "nih_plug_derive"
@@ -56,3 +59,40 @@ name = "unicode-xid"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
+
+[[package]]
+name = "vst3-com"
+version = "0.1.0"
+source = "git+https://github.com/RustAudio/vst3-sys.git#6ab2b43928588cdedcf499eecfc5a022e007dd76"
+dependencies = [
+ "vst3-com-macros",
+]
+
+[[package]]
+name = "vst3-com-macros"
+version = "0.2.0"
+source = "git+https://github.com/RustAudio/vst3-sys.git#6ab2b43928588cdedcf499eecfc5a022e007dd76"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "vst3-com-macros-support",
+]
+
+[[package]]
+name = "vst3-com-macros-support"
+version = "0.2.0"
+source = "git+https://github.com/RustAudio/vst3-sys.git#6ab2b43928588cdedcf499eecfc5a022e007dd76"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "vst3-sys"
+version = "0.1.0"
+source = "git+https://github.com/RustAudio/vst3-sys.git#6ab2b43928588cdedcf499eecfc5a022e007dd76"
+dependencies = [
+ "vst3-com",
+]

nih_plug/Cargo.toml

@@ -6,3 +6,4 @@ authors = ["Robbert van der Helm <mail@robbertvanderhelm.nl>"]
 license = "GPL-3.0-or-later"
 
 [dependencies]
+vst3-sys = { git = "https://github.com/RustAudio/vst3-sys.git" }

nih_plug/src/lib.rs

@@ -18,3 +18,4 @@ pub mod debug;
 pub mod params;
 pub mod plugin;
 pub mod util;
+pub mod wrapper;

nih_plug/src/wrapper.rs

@@ -0,0 +1,20 @@
+// nih-plug: plugins, but rewritten in Rust
+// Copyright (C) 2022 Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+//! Wrappers for different plugin types. Each wrapper has an entry point macro that you can pass the
+//! name of a type that implements `Plugin` to. The macro will handle the rest.
+
+pub mod vst3;

nih_plug/src/wrapper/vst3.rs

@@ -0,0 +1,76 @@
+// nih-plug: plugins, but rewritten in Rust
+// Copyright (C) 2022 Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+//! Wrappers for different plugin types. Each wrapper has an entry point macro that you can pass the
+//! name of a type that implements `Plugin` to. The macro will handle the rest.
+
+use std::pin::Pin;
+
+use crate::plugin::Plugin;
+
+pub struct Vst3Wrapper<P: Plugin> {
+    plugin: Pin<Box<P>>,
+}
+
+// TODO: Come up with some way to hae Cargo spit out a VST3 module. Is that possible without a
+//       custom per-plugin build script?
+#[macro_export]
+macro_rules! nih_export_vst3 {
+    ($plugin_ty:ty) => {
+        // These two entry points are used on Linux, and they would theoretically also be used on
+        // the BSDs:
+        // https://github.com/steinbergmedia/vst3_public_sdk/blob/c3948deb407bdbff89de8fb6ab8500ea4df9d6d9/source/main/linuxmain.cpp#L47-L52
+        #[no_mangle]
+        #[cfg(all(target_family = "unix", not(target_os = "macos")))]
+        pub extern "C" fn ModuleEntry(_lib_handle: *mut std::ffi::c_void) -> bool {
+            true
+        }
+
+        #[no_mangle]
+        #[cfg(all(target_family = "unix", not(target_os = "macos")))]
+        pub extern "C" fn ModuleExit() -> bool {
+            true
+        }
+
+        // These two entry points are used on macOS:
+        // https://github.com/steinbergmedia/vst3_public_sdk/blob/bc459feee68803346737901471441fd4829ec3f9/source/main/macmain.cpp#L60-L61
+        #[no_mangle]
+        #[cfg(target_os = "macos")]
+        pub extern "C" fn bundleEntry(_lib_handle: *mut std::ffi::c_void) -> bool {
+            true
+        }
+
+        #[no_mangle]
+        #[cfg(target_os = "macos")]
+        pub extern "C" fn bundleExit() -> bool {
+            true
+        }
+
+        // And these two entry points are used on Windows:
+        // https://github.com/steinbergmedia/vst3_public_sdk/blob/bc459feee68803346737901471441fd4829ec3f9/source/main/dllmain.cpp#L59-L60
+        #[no_mangle]
+        #[cfg(target_os = "windows")]
+        pub extern "system" fn InitModule() -> bool {
+            true
+        }
+
+        #[no_mangle]
+        #[cfg(target_os = "windows")]
+        pub extern "system" fn DeinitModule() -> bool {
+            true
+        }
+    };
+}

plugins/gain/src/lib.rs

@@ -111,3 +111,5 @@ impl Plugin for Gain {
         }
     }
 }
+
+nih_export_vst3!(Gain);