textured_quad
A procedurally generated checkerboard texture sampled onto a quad. The vertex stage declares
no bindless resources at all; only the fragment stage takes tex and smp, and Goldy binds
them by pipeline name.
cargo run --features examples --example textured_quad
What it demonstrates
- Stage-local resource declarations
- Named draw bindings (
tex,smp) - Automatic payload linking of
FullscreenVaryingbetween stages - Texture upload through a deposit transaction
Source
examples/textured_quad.rs:
//! Textured quad example — stage-local resources, automatic payload linking, named draw bindings.
//!
//! The vertex stage has no bindless resources; the fragment stage declares `tex` and `smp`.
//! Goldy links `FullscreenVarying` and binds resources by pipeline name.
//!
//! Run with: cargo run --example textured_quad
use goldy::{
types::{AddressMode, FilterMode, SamplerDesc, TextureFlags, TextureFormat, TextureKind},
Buffer, BufferKind, Color, Instance, Lease, LeaseRenderTarget, MemoryExchange, NodeAccess, Parcel, RenderPipeline,
RenderPipelineDesc, RequestAdapterOptions, RuntimeDescriptor, Sampler, Scheme, ShaderBinding, ShaderModule,
SurfaceConfig, SurfaceExchange, TargetLoad, Texture, Transaction, Vertex2DUv,
};
use std::ops::Shr;
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;
use common::CaptureDump;
const TEXTURED_SHADER: &str = r#"
import goldy_exp;
[goldy_vertex]
FullscreenVarying vs_main(FullscreenVertex input) {
return vs_fullscreen(input);
}
[goldy_fragment]
float4 fs_main(Interpolated<float4> tex, Filter smp, FullscreenVarying input) : SV_Target {
return tex.Sample(smp, input.uv);
}
"#;
/// Generate a checkerboard texture in RGBA8 format
fn generate_checkerboard(width: u32, height: u32, checker_size: u32) -> Vec<u8> {
let mut data = Vec::with_capacity((width * height * 4) as usize);
for y in 0..height {
for x in 0..width {
let checker_x = (x / checker_size) % 2;
let checker_y = (y / checker_size) % 2;
let is_white = (checker_x + checker_y).is_multiple_of(2);
if is_white {
data.extend_from_slice(&[255, 255, 255, 255]);
} else {
data.extend_from_slice(&[50, 100, 200, 255]);
}
}
}
data
}
const QUAD_VERTICES: [Vertex2DUv; 6] = [
Vertex2DUv {
position: [-1.0, -1.0],
uv: [0.0, 1.0],
},
Vertex2DUv {
position: [1.0, -1.0],
uv: [1.0, 1.0],
},
Vertex2DUv {
position: [1.0, 1.0],
uv: [1.0, 0.0],
},
Vertex2DUv {
position: [-1.0, -1.0],
uv: [0.0, 1.0],
},
Vertex2DUv {
position: [1.0, 1.0],
uv: [1.0, 0.0],
},
Vertex2DUv {
position: [-1.0, 1.0],
uv: [0.0, 0.0],
},
];
struct App {
instance: Instance,
ctx: Option<goldy::Context>,
device: Option<Arc<goldy::Runtime>>,
pipeline: Option<RenderPipeline>,
shader: Option<ShaderModule>,
window: Option<Arc<Window>>,
surface: Option<SurfaceExchange>,
present: Option<Transaction>,
capture: Option<CaptureDump>,
readback: Option<Texture>,
scene_rt: Option<Lease<LeaseRenderTarget>>,
scheme: Option<Scheme>,
vertex_buffer: Option<Buffer>,
texture: Option<Texture>,
sampler: Option<Sampler>,
start_time: Instant,
frame_count: u64,
}
impl App {
fn new() -> anyhow::Result<Self> {
Ok(Self {
instance: Instance::new()?,
ctx: None,
device: None,
pipeline: None,
shader: None,
window: None,
surface: None,
present: None,
capture: None,
readback: None,
scene_rt: None,
scheme: None,
vertex_buffer: None,
texture: None,
sampler: None,
start_time: Instant::now(),
frame_count: 0,
})
}
fn create_pipeline(
device: &goldy::Runtime,
shader: &ShaderModule,
format: TextureFormat,
) -> anyhow::Result<RenderPipeline> {
common::render_pipeline(
device,
shader,
format,
RenderPipelineDesc {
vertex_layout: Vertex2DUv::layout(),
..Default::default()
},
)
}
fn record_pass(
scheme: &mut Scheme,
pipeline: &RenderPipeline,
vertex_buffer: &Buffer,
texture: &Parcel,
sampler: &Sampler,
scene_rt: &Lease<LeaseRenderTarget>,
) {
let bindings = [
ShaderBinding::read("tex", texture),
ShaderBinding::sampler("smp", sampler),
];
let mut pass = scheme.render_pass(
"textured_quad",
scene_rt,
TargetLoad::Clear(Color {
r: 0.1,
g: 0.1,
b: 0.15,
a: 1.0,
}),
);
pass.with_shader_bindings(&bindings);
pass.with_parcel(vertex_buffer, NodeAccess::Read);
pass.set_pipeline(pipeline);
pass.set_vertex_buffer(0, vertex_buffer);
pass.draw(0..6, 0..1);
pass.finish();
}
fn bind_frame(
scheme: &mut Scheme,
scene_rt: &Lease<LeaseRenderTarget>,
surface: Option<&SurfaceExchange>,
readback: Option<&Texture>,
) -> anyhow::Result<Option<Transaction>> {
if let Some(surface) = surface {
let present = surface.bind_render_target(scheme, scene_rt)?;
Ok(Some(present))
} else {
let readback = readback.expect("capture readback");
scheme.copy_to_texture(scene_rt, readback)?;
Ok(None)
}
}
fn init_gpu(&mut self, window: Option<&Window>) -> anyhow::Result<()> {
let device = Arc::new(
self.instance
.request_adapter(&RequestAdapterOptions::default())?
.request_runtime(&RuntimeDescriptor::default())?,
);
let ctx = device.create_context()?;
let (surface, capture, readback, format, width, height) = if let Some(window) = window {
let surface = SurfaceExchange::new(&ctx, window, SurfaceConfig::default())?;
let format = surface.format();
let (width, height) = surface.size();
(Some(surface), None, None, format, width, height)
} else {
let capture = CaptureDump::from_env()?;
let (width, height) = capture.size();
let readback = common::capture_readback(&device, width, height)?;
(
None,
Some(capture),
Some(readback),
CaptureDump::format(),
width,
height,
)
};
let shader = ShaderModule::from_slang(&device, TEXTURED_SHADER)?;
let tex_width = 256u32;
let tex_height = 256u32;
let checker_data = generate_checkerboard(tex_width, tex_height, 32);
let texture = device.acquire_texture(
tex_width,
tex_height,
TextureFormat::Rgba8Unorm,
TextureKind::Interpolated,
TextureFlags::COPY_DST,
Some(&checker_data),
)?;
let sampler = Sampler::new(
&device,
&SamplerDesc {
mag_filter: FilterMode::Linear,
min_filter: FilterMode::Linear,
mipmap_filter: FilterMode::Nearest,
address_mode_u: AddressMode::Repeat,
address_mode_v: AddressMode::Repeat,
address_mode_w: AddressMode::Repeat,
max_anisotropy: 1.0,
compare: None,
lod_min_clamp: 0.0,
lod_max_clamp: 32.0,
},
)?;
let pipeline = Self::create_pipeline(&device, &shader, format)?;
let vertex_buffer = device.acquire_buffer_with_data(&QUAD_VERTICES, BufferKind::Scattered)?;
let mut scheme = Scheme::new(&ctx);
let scene_rt = ctx.lease_render_target(width.max(1), height.max(1), format, None)?;
Self::record_pass(&mut scheme, &pipeline, &vertex_buffer, &texture, &sampler, &scene_rt);
let present = Self::bind_frame(&mut scheme, &scene_rt, surface.as_ref(), readback.as_ref())?;
self.ctx = Some(ctx);
self.device = Some(device);
self.shader = Some(shader);
self.pipeline = Some(pipeline);
self.surface = surface;
self.present = present;
self.capture = capture;
self.readback = readback;
self.scene_rt = Some(scene_rt);
self.scheme = Some(scheme);
self.vertex_buffer = Some(vertex_buffer);
self.texture = Some(texture);
self.sampler = Some(sampler);
Ok(())
}
fn render_frame(&mut self) -> anyhow::Result<()> {
if let Some(window) = self.window.as_ref() {
let size = window.inner_size();
if size.width == 0 || size.height == 0 {
return Ok(());
}
}
let scheme = self.scheme.as_mut().unwrap();
let mut submission = scheme.submit()?;
if let Some(present) = &self.present {
(&mut submission >> present).take()?;
} else {
let pixels = (&mut submission >> self.readback.as_ref().unwrap())
.take::<u8>()?
.to_vec();
self.capture.as_mut().unwrap().write_rgba(&pixels)?;
}
self.frame_count += 1;
Ok(())
}
fn capture_done(&self) -> bool {
self.capture.as_ref().is_none_or(CaptureDump::finished)
}
fn handle_resize(&mut self, new_size: winit::dpi::PhysicalSize<u32>) {
if new_size.width == 0 || new_size.height == 0 {
return;
}
let Some(surface) = self.surface.as_mut() else {
return;
};
let _ = surface.resize(new_size.width, new_size.height);
let format = surface.format();
let (width, height) = surface.size();
if let (Some(ctx), Some(device), Some(shader), Some(vertex_buffer), Some(texture), Some(sampler)) = (
self.ctx.as_ref(),
self.device.as_ref(),
self.shader.as_ref(),
self.vertex_buffer.as_ref(),
self.texture.as_ref(),
self.sampler.as_ref(),
) {
if let Ok(pipeline) = Self::create_pipeline(device, shader, format) {
self.pipeline = Some(pipeline);
if let Some(pipeline) = self.pipeline.as_ref() {
let mut scheme = Scheme::new(ctx);
if let Ok(rt) = ctx.lease_render_target(width.max(1), height.max(1), format, None) {
Self::record_pass(&mut scheme, pipeline, vertex_buffer, texture, sampler, &rt);
if let Ok(present) =
Self::bind_frame(&mut scheme, &rt, self.surface.as_ref(), self.readback.as_ref())
{
self.present = present;
self.scheme = Some(scheme);
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(common::hidden_window(
"Goldy - Textured Quad (Scheme + Present)",
800,
800,
))
.unwrap(),
);
self.window = Some(window.clone());
self.init_gpu(Some(window.as_ref())).unwrap();
if let Err(e) = self.render_frame() {
tracing::error!("First frame error: {e}");
}
common::reveal_window(&window);
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();
if common::capture_requested() {
let mut app = App::new()?;
app.init_gpu(None)?;
while !app.capture_done() {
app.render_frame()?;
}
return Ok(());
}
println!("Goldy Textured Quad Example (Scheme + Present)");
println!("Press Escape to exit");
let event_loop = EventLoop::new()?;
event_loop.set_control_flow(ControlFlow::Poll);
event_loop.run_app(&mut App::new()?)?;
Ok(())
}The example pulls in examples/common.rs — see Shared Helpers.
The Slang source is inline in the example above.