From 79c410929590e20a1f556df08c8b714f5a44237c Mon Sep 17 00:00:00 2001 From: silvanshade Date: Sun, 27 Aug 2023 14:56:12 -0600 Subject: [PATCH] Refactoring --- crates/header-translator/src/output.rs | 1 + crates/icrate/examples/metal.rs | 342 +++++++++++++++---------- 2 files changed, 209 insertions(+), 134 deletions(-) diff --git a/crates/header-translator/src/output.rs b/crates/header-translator/src/output.rs index f274a56fc..bb33e8f36 100644 --- a/crates/header-translator/src/output.rs +++ b/crates/header-translator/src/output.rs @@ -39,6 +39,7 @@ impl Output { let mut macos_10_13_features: BTreeSet = vec![ "unstable-frameworks-macos-10-7".into(), "unstable-example-delegate".into(), + "unstable-example-metal".into(), "unstable-example-nspasteboard".into(), "unstable-example-speech_synthesis".into(), ] diff --git a/crates/icrate/examples/metal.rs b/crates/icrate/examples/metal.rs index a694df873..a574a0635 100644 --- a/crates/icrate/examples/metal.rs +++ b/crates/icrate/examples/metal.rs @@ -1,22 +1,20 @@ #![deny(unsafe_op_in_unsafe_fn)] -use core::ptr::NonNull; +use core::{cell::RefCell, ptr::NonNull}; use icrate::{ - ns_string, AppKit::{ NSApplication, NSApplicationActivationPolicyRegular, NSApplicationDelegate, NSBackingStoreBuffered, NSWindow, NSWindowStyleMaskClosable, NSWindowStyleMaskResizable, NSWindowStyleMaskTitled, }, Foundation::{ - NSDate, NSNotification, NSObject, NSObjectProtocol, NSPoint, NSRect, NSSize, NSString, + ns_string, NSDate, NSNotification, NSObject, NSObjectProtocol, NSPoint, NSRect, NSSize, }, Metal::{ - MTLArgumentEncoder, MTLCommandBuffer, MTLCommandEncoder, MTLCommandQueue, - MTLCreateSystemDefaultDevice, MTLDevice, MTLDrawable, MTLFunction, MTLLibrary, - MTLPrimitiveTypeTriangle, MTLRenderCommandEncoder, MTLRenderPipelineDescriptor, - MTLRenderPipelineState, + MTLCommandBuffer, MTLCommandEncoder, MTLCommandQueue, MTLCreateSystemDefaultDevice, + MTLDevice, MTLDrawable, MTLLibrary, MTLPrimitiveTypeTriangle, MTLRenderCommandEncoder, + MTLRenderPipelineDescriptor, MTLRenderPipelineState, }, MetalKit::{MTKView, MTKViewDelegate}, }; @@ -29,17 +27,87 @@ use objc2::{ ClassType, }; +#[rustfmt::skip] +const SHADERS: &str = r#" + #include + + struct SceneProperties { + float time; + }; + + struct VertexInput { + metal::packed_float3 position; + metal::packed_float3 color; + }; + + struct VertexOutput { + metal::float4 position [[position]]; + metal::float4 color; + }; + + vertex VertexOutput vertex_main( + device const SceneProperties& properties [[buffer(0)]], + device const VertexInput* vertices [[buffer(1)]], + uint vertex_idx [[vertex_id]] + ) { + VertexOutput out; + VertexInput in = vertices[vertex_idx]; + out.position = + metal::float4( + metal::float2x2( + metal::cos(properties.time), -metal::sin(properties.time), + metal::sin(properties.time), metal::cos(properties.time) + ) * in.position.xy, + in.position.z, + 1); + out.color = metal::float4(in.color, 1); + return out; + } + + fragment metal::float4 fragment_main(VertexOutput in [[stage_in]]) { + return in.color; + } +"#; + +#[repr(C)] +pub struct SceneProperties { + pub time: f32, +} + +#[repr(C)] +pub struct VertexInput { + pub position: Position, + pub color: Color, +} + +// NOTE: this has the same ABI as `MTLPackedFloat3` +#[repr(C)] +pub struct Position { + pub x: f32, + pub y: f32, + pub z: f32, +} + +// NOTE: this has the same ABI as `MTLPackedFloat3` +#[repr(C)] +pub struct Color { + pub r: f32, + pub g: f32, + pub b: f32, +} + +pub type IdCell = Box>>>; + // declare the Objective-C class machinery declare_class!( // declare the delegate class with our instance variables + #[rustfmt::skip] // FIXME: rustfmt breaks the macro parsing apparently struct Delegate { - device: IvarDrop>, "_device">, - command_queue: IvarDrop>, "_command_queue">, - pipeline_state: IvarDrop>, "_pipeline_state">, - pipeline_descriptor: IvarDrop, "_pipeline_descriptor">, - window: IvarDrop, "_window">, - mtk_view: IvarDrop, "_mtk_view">, start_date: IvarDrop, "_start_date">, + command_queue: IvarDrop>, "_command_queue">, + pipeline_state: IvarDrop>, "_pipeline_state">, + window: IvarDrop, "_window">, + mtk_view: IvarDrop, "_mtk_view">, } mod ivars; @@ -50,45 +118,28 @@ declare_class!( const NAME: &'static str = "Delegate"; } - // define the delegate methods for the `NSApplicationDelegate` protocol - unsafe impl NSApplicationDelegate for Delegate { - #[method(applicationDidFinishLaunching:)] - #[allow(non_snake_case)] - unsafe fn applicationDidFinishLaunching(&self, _notification: &NSNotification) { - // configure the metal view delegate - unsafe { - let object = ProtocolObject::from_ref(self); - self.mtk_view.setDelegate(Some(object)); - } - - // configure the window - unsafe { - self.window.setContentView(Some(&self.mtk_view)); - self.window.center(); - self.window.setTitle(ns_string!("metal example")); - self.window.makeKeyAndOrderFront(None); - } - } - } - // define the Delegate methods (e.g., initializer) unsafe impl Delegate { - #[method(initWithShaders:)] + #[method(init)] #[allow(non_snake_case)] - unsafe fn __initWithShaders(this: *mut Self, shaders: &NSString) -> Option> { + unsafe fn init(this: *mut Self) -> Option> { let this: Option<&mut Self> = msg_send![super(this), init]; + this.map(|this| { + Ivar::write(&mut this.start_date, unsafe { NSDate::now() }); + Ivar::write(&mut this.command_queue, IdCell::default()); + Ivar::write(&mut this.pipeline_state, IdCell::default()); + Ivar::write(&mut this.window, IdCell::default()); + Ivar::write(&mut this.mtk_view, IdCell::default()); + NonNull::from(this) + }) + } + } - // get the default device - let device = { - let ptr = unsafe { MTLCreateSystemDefaultDevice() }; - unsafe { Id::retain(ptr) }.expect("Failed to get default system device.") - }; - - // create the command queue - let command_queue = device - .newCommandQueue() - .expect("Failed to create a command queue."); - + // define the delegate methods for the `NSApplicationDelegate` protocol + unsafe impl NSApplicationDelegate for Delegate { + #[method(applicationDidFinishLaunching:)] + #[allow(non_snake_case)] + unsafe fn applicationDidFinishLaunching(&self, _notification: &NSNotification) { // create the app window let window = { let this = NSWindow::alloc(); @@ -109,6 +160,17 @@ declare_class!( } }; + // get the default device + let device = { + let ptr = unsafe { MTLCreateSystemDefaultDevice() }; + unsafe { Id::retain(ptr) }.expect("Failed to get default system device.") + }; + + // create the command queue + let command_queue = device + .newCommandQueue() + .expect("Failed to create a command queue."); + // create the metal view let mtk_view = { let this = MTKView::alloc(); @@ -126,31 +188,43 @@ declare_class!( .setPixelFormat(mtk_view.colorPixelFormat()); } - // create the pipeline state + // compile the shaders let library = device - .newLibraryWithSource_options_error(shaders, None) + .newLibraryWithSource_options_error(ns_string!(SHADERS), None) .expect("Failed to create a library."); + // configure the vertex shader let vertex_function = library.newFunctionWithName(ns_string!("vertex_main")); pipeline_descriptor.setVertexFunction(vertex_function.as_deref()); + // configure the fragment shader let fragment_function = library.newFunctionWithName(ns_string!("fragment_main")); pipeline_descriptor.setFragmentFunction(fragment_function.as_deref()); + // create the pipeline state let pipeline_state = device .newRenderPipelineStateWithDescriptor_error(&pipeline_descriptor) .expect("Failed to create a pipeline state."); - this.map(|this| { - Ivar::write(&mut this.device, device); - Ivar::write(&mut this.command_queue, command_queue); - Ivar::write(&mut this.pipeline_state, pipeline_state); - Ivar::write(&mut this.pipeline_descriptor, pipeline_descriptor); - Ivar::write(&mut this.window, window); - Ivar::write(&mut this.mtk_view, mtk_view); - Ivar::write(&mut this.start_date, unsafe { NSDate::now() }); - NonNull::from(this) - }) + // configure the metal view delegate + unsafe { + let object = ProtocolObject::from_ref(self); + mtk_view.setDelegate(Some(object)); + } + + // configure the window + unsafe { + window.setContentView(Some(&mtk_view)); + window.center(); + window.setTitle(ns_string!("metal example")); + window.makeKeyAndOrderFront(None); + } + + // initialize the delegate state + self.command_queue.borrow_mut().replace(command_queue); + self.pipeline_state.borrow_mut().replace(pipeline_state); + self.window.borrow_mut().replace(window); + self.mtk_view.borrow_mut().replace(mtk_view); } } @@ -159,66 +233,99 @@ declare_class!( #[method(drawInMTKView:)] #[allow(non_snake_case)] unsafe fn drawInMTKView(&self, _view: &MTKView) { + let command_queue = self.command_queue.borrow(); + let Some(command_queue) = command_queue.as_ref() else { return; }; + + let mtk_view = self.mtk_view.borrow(); + let Some(mtk_view) = mtk_view.as_ref() else { return; }; + + let pipeline_state = self.pipeline_state.borrow(); + let Some(pipeline_state) = pipeline_state.as_ref() else { return; }; + // FIXME: icrate `MTKView` doesn't have a generated binding for `currentDrawable` yet // (because it needs a definition of `CAMetalDrawable`, which we don't support yet) so // we have to use a raw `msg_send_id` call here instead. let current_drawable: Option>> = - msg_send_id![&*self.mtk_view, currentDrawable]; + msg_send_id![mtk_view, currentDrawable]; + // prepare for drawing let Some(current_drawable) = current_drawable else { return; }; - let Some(command_buffer) = self.command_queue.commandBuffer() else { return; }; - let Some(pass_descriptor) = (unsafe { self.mtk_view.currentRenderPassDescriptor() }) else { return; }; + let Some(command_buffer) = command_queue.commandBuffer() else { return; }; + let Some(pass_descriptor) = (unsafe { mtk_view.currentRenderPassDescriptor() }) else { return; }; let Some(encoder) = command_buffer.renderCommandEncoderWithDescriptor(&pass_descriptor) else { return; }; - #[rustfmt::skip] - let vertex_data: &mut [f32] = &mut [ - -f32::sqrt(3.0) / 4.0, -0.25, 0. , 1. , 0. , 0. , - f32::sqrt(3.0) / 4.0, -0.25, 0. , 0. , 1. , 0. , - 0. , 0.5, 0. , 0. , 0. , 1. , - ]; - - let vertex_bytes = unsafe { - NonNull::new_unchecked(vertex_data.as_mut_ptr().cast::()) + // compute the scene properties + let mut scene_properties_data = SceneProperties { + time: unsafe { self.start_date.timeIntervalSinceNow() } as f32, }; + // write the scene properties to the vertex shader argument buffer at index 0 + let scene_properties_bytes = + unsafe { NonNull::new_unchecked(&mut scene_properties_data) }; unsafe { encoder.setVertexBytes_length_atIndex( - vertex_bytes, - vertex_data.len() * core::mem::size_of::(), + scene_properties_bytes.cast::(), + core::mem::size_of::(), 0, ) }; - let argument_encoder = unsafe { - self.pipeline_descriptor - .vertexFunction() - .unwrap() - .newArgumentEncoderWithBufferIndex(1) - }; - - let argument_buffer = self - .device - .newBufferWithLength_options(argument_encoder.encodedLength(), 0) - .unwrap(); - + // compute the triangle geometry + let vertex_input_data: &mut [VertexInput] = &mut [ + VertexInput { + position: Position { + x: -f32::sqrt(3.0) / 4.0, + y: -0.25, + z: 0., + }, + color: Color { + r: 1., + g: 0., + b: 0., + }, + }, + VertexInput { + position: Position { + x: f32::sqrt(3.0) / 4.0, + y: -0.25, + z: 0., + }, + color: Color { + r: 0., + g: 1., + b: 0., + }, + }, + VertexInput { + position: Position { + x: 0., + y: 0.5, + z: 0., + }, + color: Color { + r: 0., + g: 0., + b: 1., + }, + }, + ]; + // write the triangle geometry to the vertex shader argument buffer at index 1 + let vertex_input_bytes = unsafe { NonNull::new_unchecked(vertex_input_data) }; unsafe { - argument_encoder.setArgumentBuffer_offset(Some(&*argument_buffer), 0); - }; - - let time = unsafe { - (argument_encoder.constantDataAtIndex(0).as_ptr() as *mut f32) - .as_mut() - .unwrap() + encoder.setVertexBytes_length_atIndex( + vertex_input_bytes.cast::(), + vertex_input_data.len() * core::mem::size_of::(), + 1, + ) }; - - *time = unsafe { self.start_date.timeIntervalSinceNow() as f32 }; - unsafe { encoder.setVertexBuffer_offset_atIndex(Some(&*argument_buffer), 0, 1) }; - - encoder.setRenderPipelineState(&self.pipeline_state); + // configure the encoder with the pipeline and draw the triangle + encoder.setRenderPipelineState(pipeline_state); unsafe { encoder.drawPrimitives_vertexStart_vertexCount(MTLPrimitiveTypeTriangle, 0, 3) }; encoder.endEncoding(); + + // schedule the command buffer for display and commit command_buffer.presentDrawable(¤t_drawable); command_buffer.commit(); } @@ -233,52 +340,19 @@ declare_class!( unsafe impl NSObjectProtocol for Delegate {} -#[cfg(target_os = "macos")] impl Delegate { - pub fn init_with_shaders(shaders: &NSString) -> Id { - unsafe { msg_send_id![Self::alloc(), initWithShaders: shaders] } + pub fn new() -> Id { + unsafe { msg_send_id![Self::alloc(), init] } } } fn main() { + // configure the app let app = unsafe { NSApplication::sharedApplication() }; unsafe { app.setActivationPolicy(NSApplicationActivationPolicyRegular) }; - let shaders = ns_string!( - r#" - #include - using namespace metal; - struct FragmentShaderArguments { - float time [[id(0)]]; - }; - struct VertexIn { - packed_float3 position; - packed_float3 color; - }; - - struct VertexOut { - float4 position [[position]]; - float4 color; - }; - vertex VertexOut vertex_main( - device const VertexIn *vertices [[buffer(0)]], - device const FragmentShaderArguments & arg [[buffer(1)]], - uint vertexId [[vertex_id]] - ) { - VertexOut out; - VertexIn vert = vertices[vertexId]; - out.position = float4(float2x2(cos(arg.time), -sin(arg.time), sin(arg.time), cos(arg.time))*vert.position.xy, vert.position.z, 1); - out.color = float4(vert.color, 1); - return out; - } - fragment float4 fragment_main(VertexOut in [[stage_in]]) { - return in.color; - } - "# - ); - // initialize the delegate - let delegate = Delegate::init_with_shaders(shaders); + let delegate = Delegate::new(); // configure the application delegate unsafe {