unnieversal/crates/baseplug/doc/plugin_api_notes.md at a09d9f83a40535bbccc8cda48785050ff1d0353d

dispatch(opcode: i32, index: i32, value: isize, ptr: *mut c_void, opt: f32) -> isize - Dispatch an event with an opcode.

Get VST API Version - Return the VST API version.
Shutdown - Shut down the plugin.
SetSampleRate - Set the sample rate to opt.
StateChanged - (Is this a call to reset the plugin I assume?)
GetParameterName - Store the name of the parameter at index into `ptr. Return 0 for success.
GetParameterLabel - Store the label of the parameter at index into `ptr. Return 0 for success.
GetParameterDisplay - (Not sure what this does)
CanBeAutomated - (Not sure what this does)
GetEffectName - Store the effect name into ptr. Return 1 for success.
GetProductName - Store the product name into ptr. Return 1 for success.
GetVendorName - Store the vendor name into ptr. Return 1 for success.
GetCurrentPresetName - (Incomplete I assume?)
ProcessEvent - (Not sure what this does)
GetData - (Not sure what this does)
SetData - (Not sure what this does)
EditorGetRect - Store initial plugin window size into ptr. The host may call this before opening the plugin editor window. Returning the correct size based on DPI scaling can be acheived by first a VST extension, second from a user-supplied config-file, and third from guessing the DPI scaling of the system.
EditorOpen - Open the editor window. (Is ptr a handle to the window?)
EditorClose - Close the editor window.
UnhandledOpCode - Print the unhandled opcode.

get_parameter(index: i32) -> f32 - Retreive the current value of the parameter at index.

set_parameter(index: i32, val: f32) - Set the value of the parameter at index.

get_musical_time() -> MusicalTime { bmp: f64, beat: f64 } - Retreive musical time information.

process_replacing(in_buffers: *const *const f32, out_buffers: *mut *mut f32, nframes: i32) - Process buffers.

VST2