use cuneus::compute::*;
use cuneus::prelude::*;
cuneus::uniform_params! {
struct BuddhabrotParams {
max_iterations: u32,
escape_radius: f32,
zoom: f32,
offset_x: f32,
offset_y: f32,
rotation: f32,
exposure: f32,
sample_density: f32,
motion_speed: f32,
dithering: f32,
wavelength_min: f32,
wavelength_max: f32,
gamma: f32,
saturation: f32,
color_shift: f32,
intensity_scale: f32,
white_balance_r: f32,
white_balance_g: f32,
white_balance_b: f32,
min_trajectory_len: u32,
}
}
struct BuddhabrotShader {
base: RenderKit,
compute_shader: ComputeShader,
frame_count: u32,
accumulated_rendering: bool,
current_params: BuddhabrotParams,
}
impl BuddhabrotShader {
fn clear_buffers(&mut self, core: &Core) {
self.compute_shader.clear_atomic_buffer(core);
self.compute_shader.current_frame = 0;
self.frame_count = 0;
self.accumulated_rendering = false;
}
}
impl ShaderManager for BuddhabrotShader {
fn init(core: &Core) -> Self {
let base = RenderKit::new(core);
let initial_params = BuddhabrotParams {
max_iterations: 500,
escape_radius: 4.0,
zoom: 0.5,
offset_x: -0.5,
offset_y: 0.0,
rotation: 1.55,
exposure: 6.5,
sample_density: 0.5,
motion_speed: 0.0,
dithering: 0.2,
wavelength_min: 485.0,
wavelength_max: 660.0,
gamma: 0.6,
saturation: 1.2,
color_shift: 1.1,
intensity_scale: 5.0,
white_balance_r: 1.2,
white_balance_g: 1.0,
white_balance_b: 1.08,
min_trajectory_len: 20,
};
let mut config = ComputeShader::builder()
.with_entry_point("Splat")
.with_custom_uniforms::<BuddhabrotParams>()
.with_atomic_buffer(3)
.with_workgroup_size([16, 16, 1])
.with_texture_format(COMPUTE_TEXTURE_FORMAT_RGBA16)
.with_label("Spectral Buddhabrot")
.build();
config.entry_points.push("main_image".to_string());
let compute_shader = cuneus::compute_shader!(core, "shaders/buddhabrot.wgsl", config);
compute_shader.set_custom_params(initial_params, &core.queue);
Self {
base,
compute_shader,
frame_count: 0,
accumulated_rendering: false,
current_params: initial_params,
}
}
fn update(&mut self, core: &Core) {
self.compute_shader.handle_export_dispatch(
core,
&mut self.base,
|shader, encoder, core| {
shader.dispatch_stage_with_workgroups(encoder, 0, [2048, 1, 1]);
shader.dispatch_stage(encoder, core, 1);
},
);
}
fn resize(&mut self, core: &Core) {
self.base.default_resize(core, &mut self.compute_shader);
}
fn render(&mut self, core: &Core) -> Result<(), cuneus::SurfaceError> {
let mut frame = self.base.begin_frame(core)?;
let mut params = self.current_params;
let mut changed = false;
let mut should_start_export = false;
let mut export_request = self.base.export_manager.get_ui_request();
let mut controls_request = self
.base
.controls
.get_ui_request(&self.base.start_time, &core.size, self.base.fps_tracker.fps());
let full_output = if self.base.key_handler.show_ui {
self.base.render_ui(core, |ctx| {
RenderKit::apply_default_style(ctx);
egui::Window::new("Spectral Buddhabrot")
.collapsible(true)
.resizable(true)
.default_width(300.0)
.min_width(250.0)
.max_width(500.0)
.show(ctx, |ui| {
egui::CollapsingHeader::new("Fractal")
.default_open(false)
.show(ui, |ui| {
changed |= ui
.add(egui::Slider::new(&mut params.max_iterations, 100..=2000).text("Max Iterations"))
.changed();
changed |= ui
.add(egui::Slider::new(&mut params.escape_radius, 2.0..=20.0).text("Escape Radius"))
.changed();
changed |= ui
.add(egui::Slider::new(&mut params.min_trajectory_len, 5..=200).text("Min Trajectory"))
.changed();
changed |= ui
.add(egui::Slider::new(&mut params.sample_density, 0.1..=2.0).text("Sample Density"))
.changed();
});
egui::CollapsingHeader::new("View")
.default_open(false)
.show(ui, |ui| {
changed |= ui
.add(egui::Slider::new(&mut params.zoom, 0.1..=10.0).logarithmic(true).text("Zoom"))
.changed();
changed |= ui
.add(egui::Slider::new(&mut params.offset_x, -2.0..=1.0).text("Offset X"))
.changed();
changed |= ui
.add(egui::Slider::new(&mut params.offset_y, -1.5..=1.5).text("Offset Y"))
.changed();
changed |= ui
.add(egui::Slider::new(&mut params.rotation, -3.14159..=3.14159).text("Rotation"))
.changed();
});
egui::CollapsingHeader::new("Spectral")
.default_open(true)
.show(ui, |ui| {
ui.label("Wavelength range (nm)");
changed |= ui
.add(egui::Slider::new(&mut params.wavelength_min, 390.0..=700.0).text("Min"))
.changed();
changed |= ui
.add(egui::Slider::new(&mut params.wavelength_max, 390.0..=700.0).text("Max"))
.changed();
ui.separator();
changed |= ui
.add(egui::Slider::new(&mut params.color_shift, 0.0..=2.0).text("Color Curve"))
.changed();
changed |= ui
.add(egui::Slider::new(&mut params.saturation, 0.0..=3.0).text("Saturation"))
.changed();
changed |= ui
.add(egui::Slider::new(&mut params.intensity_scale, 0.1..=10.0).logarithmic(true).text("Intensity"))
.changed();
});
egui::CollapsingHeader::new("Tone Mapping")
.default_open(false)
.show(ui, |ui| {
changed |= ui
.add(egui::Slider::new(&mut params.exposure, 0.5..=10.0).text("Exposure"))
.changed();
changed |= ui
.add(egui::Slider::new(&mut params.gamma, 0.2..=2.2).text("Gamma"))
.changed();
changed |= ui
.add(egui::Slider::new(&mut params.dithering, 0.0..=1.0).text("Dithering"))
.changed();
ui.separator();
ui.label("White Balance");
changed |= ui
.add(egui::Slider::new(&mut params.white_balance_r, 0.5..=2.0).text("R"))
.changed();
changed |= ui
.add(egui::Slider::new(&mut params.white_balance_g, 0.5..=2.0).text("G"))
.changed();
changed |= ui
.add(egui::Slider::new(&mut params.white_balance_b, 0.5..=2.0).text("B"))
.changed();
});
egui::CollapsingHeader::new("Rendering")
.default_open(false)
.show(ui, |ui| {
changed |= ui
.add(egui::Slider::new(&mut params.motion_speed, 0.0..=1.0).text("Motion (clears buf)"))
.changed();
ui.horizontal(|ui| {
ui.label("Accumulate:");
ui.checkbox(&mut self.accumulated_rendering, "");
});
});
ui.separator();
ShaderControls::render_controls_widget(ui, &mut controls_request);
ui.separator();
should_start_export =
ExportManager::render_export_ui_widget(ui, &mut export_request);
});
})
} else {
self.base.render_ui(core, |_ctx| {})
};
self.base.export_manager.apply_ui_request(export_request);
if controls_request.should_clear_buffers {
self.clear_buffers(core);
}
self.base.apply_control_request(controls_request);
let current_time = self.base.controls.get_time(&self.base.start_time);
let delta = 1.0 / 60.0;
self.compute_shader
.set_time(current_time, delta, &core.queue);
if changed {
self.current_params = params;
self.compute_shader.set_custom_params(params, &core.queue);
if !self.accumulated_rendering {
self.clear_buffers(core);
}
}
if should_start_export {
self.base.export_manager.start_export();
}
let should_generate_samples =
!self.accumulated_rendering || self.compute_shader.current_frame < 500;
if should_generate_samples {
self.compute_shader
.dispatch_stage_with_workgroups(&mut frame.encoder, 0, [2048, 1, 1]);
}
self.compute_shader
.dispatch_stage(&mut frame.encoder, core, 1);
self.compute_shader.current_frame += 1;
self.base
.renderer
.render_to_view(&mut frame.encoder, &frame.view, &self.compute_shader.get_output_texture().bind_group);
self.base.end_frame(core, frame, full_output);
self.frame_count = self.frame_count.wrapping_add(1);
Ok(())
}
fn handle_input(&mut self, core: &Core, event: &WindowEvent) -> bool {
self.base.default_handle_input(core, event)
}
}
fn main() -> Result<(), Box<dyn std::error::Error>> {
env_logger::init();
let (app, event_loop) = cuneus::ShaderApp::new("Spectral Buddhabrot", 800, 600);
app.run(event_loop, BuddhabrotShader::init)
}