use goldy::{
shaders, Buffer, BufferFlags, BufferKind, Color, DepositTransaction, DeviceDescriptor, Instance, LayoutCheckable,
Lease, LeaseRenderTarget, MemoryExchange, NodeAccess, RenderPipeline, RenderPipelineDesc, RequestAdapterOptions,
RetainedPool, Scheme, ShaderModule, SurfaceConfig, SurfaceExchange, TargetLoad, Transaction, VertexBufferLayout,
};
use std::sync::Arc;
use std::time::Instant;
use winit::{
application::ApplicationHandler,
event::WindowEvent,
event_loop::{ActiveEventLoop, ControlFlow, EventLoop},
keyboard::{Key, NamedKey},
window::{Window, WindowId},
};
mod common;
#[repr(C)]
#[derive(Clone, Copy, bytemuck::Pod, bytemuck::Zeroable, LayoutCheckable)]
struct TimeUniforms {
time: f32,
}
impl goldy::StructuredBufferElement for TimeUniforms {}
struct App {
instance: Instance,
ctx: Option<goldy::Context>,
device: Option<Arc<goldy::Device>>,
pipeline: Option<RenderPipeline>,
shader: Option<ShaderModule>,
_retained_pool: Option<RetainedPool>,
uniform: Option<Buffer>,
window: Option<Arc<Window>>,
surface: Option<SurfaceExchange>,
present: Option<Transaction>,
scene_rt: Option<Lease<LeaseRenderTarget>>,
scheme: Option<Scheme>,
upload_scheme: Option<Scheme>,
uniform_deposit: Option<DepositTransaction>,
start_time: Instant,
frame_count: u32,
}
impl App {
fn new() -> anyhow::Result<Self> {
Ok(Self {
instance: Instance::new()?,
ctx: None,
device: None,
pipeline: None,
shader: None,
_retained_pool: None,
uniform: None,
window: None,
surface: None,
present: None,
scene_rt: None,
scheme: None,
upload_scheme: None,
uniform_deposit: None,
start_time: Instant::now(),
frame_count: 0,
})
}
fn create_pipeline(
device: &goldy::Device,
shader: &ShaderModule,
surface: &SurfaceExchange,
) -> anyhow::Result<RenderPipeline> {
common::render_pipeline_for_surface(
device,
shader,
surface,
RenderPipelineDesc {
vertex_layout: VertexBufferLayout::empty(),
..Default::default()
},
)
}
fn record_scheme(
scheme: &mut Scheme,
surface: &SurfaceExchange,
pipeline: &RenderPipeline,
uniform: &Buffer,
scene_rt: &Lease<LeaseRenderTarget>,
) -> anyhow::Result<Transaction> {
let mut pass = scheme.render_pass("gradient", scene_rt, TargetLoad::Clear(Color::BLACK));
pass.with_parcel(uniform, NodeAccess::Read);
pass.set_pipeline(pipeline);
pass.draw_fullscreen();
pass.finish();
surface.bind_render_target(scheme, scene_rt).map_err(Into::into)
}
fn init_gpu(&mut self, window: &Arc<Window>) -> anyhow::Result<()> {
let device = Arc::new(
self.instance
.request_adapter(&RequestAdapterOptions::default())?
.request_device(&DeviceDescriptor::default())?,
);
let ctx = device.create_context()?;
let surface = SurfaceExchange::new(&ctx, window.as_ref(), SurfaceConfig::default())?;
let shader = ShaderModule::from_slang_with_options(
&device,
shaders::GRADIENT,
&[],
&[],
Default::default(),
&[TimeUniforms::LAYOUT_CHECK],
)?;
let pipeline = Self::create_pipeline(&device, &shader, &surface)?;
let mut retained_pool = RetainedPool::new(device.clone());
let uniform =
retained_pool.acquire_buffer_sized::<TimeUniforms>(1, BufferKind::Broadcast, BufferFlags::empty())?;
let mut scheme = Scheme::new(&ctx);
let (width, height) = surface.size();
let scene_rt = scheme.lease_render_target(width.max(1), height.max(1), surface.format(), None)?;
let present = Self::record_scheme(&mut scheme, &surface, &pipeline, &uniform, &scene_rt)?;
let mut upload_scheme = Scheme::new(&ctx);
let uniform_deposit = MemoryExchange::new(&ctx).bind_deposit_buffer(
&mut upload_scheme,
&uniform,
std::mem::size_of::<TimeUniforms>() as u64,
)?;
self.ctx = Some(ctx);
self.device = Some(device);
self.shader = Some(shader);
self.pipeline = Some(pipeline);
self._retained_pool = Some(retained_pool);
self.uniform = Some(uniform);
self.surface = Some(surface);
self.present = Some(present);
self.scene_rt = Some(scene_rt);
self.scheme = Some(scheme);
self.upload_scheme = Some(upload_scheme);
self.uniform_deposit = Some(uniform_deposit);
Ok(())
}
fn render_frame(&mut self) -> anyhow::Result<()> {
self.frame_count += 1;
let window = self.window.as_ref().unwrap();
let size = window.inner_size();
if size.width == 0 || size.height == 0 {
return Ok(());
}
let scheme = self.scheme.as_mut().unwrap();
let time = self.start_time.elapsed().as_secs_f32();
let uniforms = TimeUniforms { time };
let upload = self.upload_scheme.as_mut().unwrap();
self.uniform_deposit
.unwrap()
.write(upload, 0, bytemuck::bytes_of(&uniforms))?;
upload.submit()?;
let present = self.present.as_ref().unwrap();
let mut submission = scheme.submit()?;
present.claim(&mut submission)?.consume()?;
Ok(())
}
fn handle_resize(&mut self, new_size: winit::dpi::PhysicalSize<u32>) {
if new_size.width > 0 && new_size.height > 0 {
if let Some(surface) = &self.surface {
let _ = surface.resize(new_size.width, new_size.height);
}
if let (Some(device), Some(surface), Some(shader)) = (&self.device, &self.surface, &self.shader) {
if let Ok(pipeline) = Self::create_pipeline(device, shader, surface) {
self.pipeline = Some(pipeline);
if let (Some(ctx), Some(pipeline), Some(uniform), Some(surface)) = (
self.ctx.as_ref(),
self.pipeline.as_ref(),
self.uniform.as_ref(),
self.surface.as_ref(),
) {
let mut scheme = Scheme::new(ctx);
let (width, height) = surface.size();
if let Ok(rt) = scheme.lease_render_target(width.max(1), height.max(1), surface.format(), None)
{
if let Ok(present) = Self::record_scheme(&mut scheme, surface, pipeline, uniform, &rt) {
self.scheme = Some(scheme);
self.present = Some(present);
self.scene_rt = Some(rt);
}
}
}
}
}
}
}
}
impl Drop for App {
fn drop(&mut self) {
let elapsed = self.start_time.elapsed().as_secs_f64();
let fps = if elapsed > 0.0 {
self.frame_count as f64 / elapsed
} else {
0.0
};
println!(
"GOLDY_PERF: frames={} elapsed={elapsed:.2}s avg_fps={fps:.1}",
self.frame_count
);
}
}
impl ApplicationHandler for App {
fn resumed(&mut self, event_loop: &ActiveEventLoop) {
if self.window.is_none() {
let window = Arc::new(
event_loop
.create_window(
Window::default_attributes()
.with_title("Goldy - Animated Gradient (Scheme + Present)")
.with_inner_size(winit::dpi::LogicalSize::new(800, 600)),
)
.unwrap(),
);
self.window = Some(window.clone());
self.init_gpu(&window).unwrap();
window.request_redraw();
}
}
fn about_to_wait(&mut self, event_loop: &ActiveEventLoop) {
common::exit_if_timed_out(event_loop, self.start_time);
}
fn window_event(&mut self, event_loop: &ActiveEventLoop, _: WindowId, event: WindowEvent) {
match event {
WindowEvent::CloseRequested => event_loop.exit(),
WindowEvent::KeyboardInput { event, .. } if event.state.is_pressed() => {
if matches!(event.logical_key, Key::Named(NamedKey::Escape)) {
event_loop.exit();
}
}
WindowEvent::RedrawRequested => {
if let Err(e) = self.render_frame() {
tracing::error!("Render error: {}", e);
}
self.window.as_ref().unwrap().request_redraw();
}
WindowEvent::Resized(new_size) => {
self.handle_resize(new_size);
if let Some(window) = &self.window {
window.request_redraw();
}
}
_ => {}
}
}
}
fn main() -> anyhow::Result<()> {
tracing_subscriber::fmt()
.with_env_filter(
tracing_subscriber::EnvFilter::try_from_default_env()
.unwrap_or_else(|_| tracing_subscriber::EnvFilter::new("warn")),
)
.init();
println!("Goldy Gradient Example - Press Escape to exit");
let event_loop = EventLoop::new()?;
event_loop.set_control_flow(ControlFlow::Poll);
event_loop.run_app(&mut App::new()?)?;
Ok(())
}