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//! Canvas rendering.
use crate::{canvas::*, gpu::*, Options, Result, World};
use glium::{glutin::EventsLoop, texture::texture2d_multisample::Texture2dMultisample, Frame};
use image::{ImageBuffer, Rgba};
use palette::{
encoding::{srgb::Srgb, TransferFn},
Component,
};
use rand::{random, rngs::StdRng};
use rayon::prelude::*;
use std::{path::PathBuf, time::Duration};
/// The context of the current render frame.
#[derive(Debug)]
pub struct Context<'a> {
/// A random number generator. This is shared between frames.
///
/// To branch the rng, keep a clone.
pub rng: &'a mut StdRng,
/// The world in which painting takes place.
pub world: World,
/// The current frame in the composition.
pub frame: usize,
/// The elapsed time in the composition.
pub time: Duration,
}
pub enum Rebuild {
NewSeed(u64),
}
pub struct RenderReport {
/// Whether the user explicitly quit.
pub explicit_quit: bool,
/// An instruction to rebuild the render.
pub rebuild: Option<Rebuild>,
}
#[derive(Debug)]
struct FrameUpdates {
new_seed: Option<u64>,
wait: Option<Duration>,
should_quit: bool,
}
pub enum RenderStrategy<F1, F2> {
Screen {
get_frame: F1,
events_loop: EventsLoop,
wait: Duration,
},
File {
output_path: F2,
buffer: Texture2dMultisample,
},
}
/// A render gate renders frames.
pub struct Renderer<'a, F1, F2> {
pub strategy: &'a mut RenderStrategy<F1, F2>,
pub gpu: &'a Gpu,
pub options: Options,
pub rng: &'a mut StdRng,
pub output_width: u32,
pub output_height: u32,
}
impl<'a, F1: Fn() -> Frame + 'a, F2: Fn(usize, u64) -> PathBuf> Renderer<'a, F1, F2> {
/// Render all of the frames for the composition. This will not return until until all frames of
/// the composition have been rendered.
pub fn render_frames(
&mut self,
mut f: impl FnMut(Context, &mut Canvas),
) -> Result<RenderReport> {
let default_shader = self.gpu.default_shader();
let end_frame = self.options.world.frames.map(|f| f + self.options.delay);
for frame in std::iter::successors(Some(0), move |last| {
if let Some(end_frame) = end_frame {
if last + 1 <= end_frame {
Some(last + 1)
} else {
None
}
} else {
Some(last + 1)
}
}) {
let mut canvas = Canvas::new(default_shader.clone(), self.options.world.scale);
f(
Context {
rng: self.rng,
world: self.options.world,
frame,
time: Duration::from_secs_f32(
frame as f32 / self.options.world.framerate as f32,
),
},
&mut canvas,
);
let updates = self.render_frame(self.options.world.seed, frame, canvas)?;
if updates.should_quit {
return Ok(RenderReport {
explicit_quit: true,
rebuild: None,
});
}
if let Some(wait) = updates.wait {
std::thread::sleep(wait);
}
if let Some(new_seed) = updates.new_seed {
return Ok(RenderReport {
explicit_quit: false,
rebuild: Some(Rebuild::NewSeed(new_seed)),
});
}
}
Ok(RenderReport {
explicit_quit: false,
rebuild: None,
})
}
fn render_frame(
&mut self,
current_seed: u64,
frame_number: usize,
canvas: Canvas,
) -> Result<FrameUpdates> {
match self.strategy {
RenderStrategy::Screen {
get_frame,
events_loop,
wait,
} => {
let mut frame = get_frame();
frame.set_finish()?;
self.gpu
.render(self.output_width, self.output_height, canvas, &mut frame)?;
let mut new_seed = None;
let mut should_quit = false;
events_loop.poll_events(|event| {
use glutin::{DeviceEvent, ElementState, Event, KeyboardInput, VirtualKeyCode};
match event {
Event::DeviceEvent {
event:
DeviceEvent::Key(KeyboardInput {
virtual_keycode: Some(VirtualKeyCode::Escape),
..
}),
..
} => {
should_quit = true;
}
Event::DeviceEvent {
event:
DeviceEvent::Key(KeyboardInput {
state: ElementState::Released,
virtual_keycode: Some(VirtualKeyCode::R),
..
}),
..
} => {
new_seed = Some(random());
}
_ => {}
}
});
Ok(FrameUpdates {
new_seed,
wait: Some(*wait),
should_quit,
})
}
RenderStrategy::File {
output_path,
buffer,
} => {
self.gpu.render(
self.output_width,
self.output_height,
canvas,
&mut buffer.as_surface(),
)?;
if frame_number > self.options.delay {
let raw: glium::texture::RawImage2d<u8> = self.gpu.read_to_ram(&buffer)?;
let image: ImageBuffer<Rgba<u8>, Vec<u8>> = ImageBuffer::from_raw(
self.output_width,
self.output_height,
raw.data
.into_par_iter()
.map(|v| v.convert::<f32>())
.map(|v: f32| <Srgb as TransferFn>::from_linear(v))
.map(|v| v.convert::<u8>())
.collect(),
)
.unwrap();
image.save(output_path(frame_number, current_seed))?;
}
Ok(FrameUpdates {
new_seed: None,
wait: None,
should_quit: false,
})
}
}
}
}