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Copy pathmask.rs
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174 lines (166 loc) · 7.68 KB
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Copy pathmask.rs
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174 lines (166 loc) · 7.68 KB
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//! GPU mask coverage and masked-effect mixing (WGSL compute), the counterpart of
//! [`filmcraft_render::mask`]. Tested for parity with the CPU path.
use filmcraft_render::mask::FlatMask;
pub struct GpuMask {
device: wgpu::Device,
queue: wgpu::Queue,
pipeline: wgpu::ComputePipeline,
bgl: wgpu::BindGroupLayout,
}
fn storage(binding: u32, read_only: bool) -> wgpu::BindGroupLayoutEntry {
wgpu::BindGroupLayoutEntry {
binding,
visibility: wgpu::ShaderStages::COMPUTE,
ty: wgpu::BindingType::Buffer { ty: wgpu::BufferBindingType::Storage { read_only }, has_dynamic_offset: false, min_binding_size: None },
count: None,
}
}
fn f32_bytes(v: &[f32]) -> Vec<u8> {
v.iter().flat_map(|x| x.to_le_bytes()).collect()
}
impl GpuMask {
pub fn new(device: &wgpu::Device, queue: &wgpu::Queue) -> Self {
let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
label: Some("filmcraft-mask"),
source: wgpu::ShaderSource::Wgsl(include_str!("mask.wgsl").into()),
});
let bgl = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
label: Some("mask"),
entries: &[
wgpu::BindGroupLayoutEntry {
binding: 0,
visibility: wgpu::ShaderStages::COMPUTE,
ty: wgpu::BindingType::Buffer { ty: wgpu::BufferBindingType::Uniform, has_dynamic_offset: false, min_binding_size: None },
count: None,
},
storage(1, true),
storage(2, true),
storage(3, true),
storage(4, true),
storage(5, false),
storage(6, false),
],
});
let pl = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor { label: Some("mask"), bind_group_layouts: &[Some(&bgl)], immediate_size: 0 });
let pipeline = device.create_compute_pipeline(&wgpu::ComputePipelineDescriptor {
label: Some("mask"),
layout: Some(&pl),
module: &shader,
entry_point: Some("main"),
compilation_options: Default::default(),
cache: None,
});
GpuMask { device: device.clone(), queue: queue.clone(), pipeline, bgl }
}
/// Combined coverage of `masks` over `w`×`h` pixels (`None` without active masks).
pub fn coverage(&self, masks: &[FlatMask], w: usize, h: usize) -> Option<Vec<f32>> {
self.run(masks, w, h, None).map(|(cov, _)| cov)
}
/// `lerp(original, effected, coverage)` on premultiplied RGBA f32 pixels (a masked effect).
pub fn mix(&self, masks: &[FlatMask], w: usize, h: usize, original: &[f32], effected: &[f32]) -> Option<Vec<f32>> {
self.run(masks, w, h, Some((original, effected))).map(|(_, px)| px)
}
fn run(&self, masks: &[FlatMask], w: usize, h: usize, mix: Option<(&[f32], &[f32])>) -> Option<(Vec<f32>, Vec<f32>)> {
use wgpu::util::DeviceExt;
let active: Vec<&FlatMask> = masks.iter().filter(|m| m.mode.index() != 0).collect();
if active.is_empty() || w == 0 || h == 0 {
return None;
}
let n = w * h;
if let Some((o, e)) = mix
&& (o.len() != n * 4 || e.len() != n * 4)
{
return None;
}
let mut params = Vec::with_capacity(16);
for v in [w as u32, h as u32, active.len() as u32, u32::from(mix.is_some())] {
params.extend_from_slice(&v.to_le_bytes());
}
let mut infos = Vec::new();
let mut pts: Vec<f32> = Vec::new();
for m in &active {
let start = (pts.len() / 2) as u32;
pts.extend(m.pts.iter().flatten());
for v in [start, m.pts.len() as u32, m.mode.index(), u32::from(m.inverted)] {
infos.extend_from_slice(&v.to_le_bytes());
}
for v in [m.feather, m.expansion, m.opacity, 0.0] {
infos.extend_from_slice(&v.to_le_bytes());
}
}
if pts.is_empty() {
pts.extend([0.0, 0.0]);
}
let d = &self.device;
let init = |label: &str, contents: &[u8], usage| d.create_buffer_init(&wgpu::util::BufferInitDescriptor { label: Some(label), contents, usage });
let ub = init("mask-params", ¶ms, wgpu::BufferUsages::UNIFORM);
let mb = init("mask-infos", &infos, wgpu::BufferUsages::STORAGE);
let pb = init("mask-pts", &f32_bytes(&pts), wgpu::BufferUsages::STORAGE);
let dummy = [0.0f32; 4];
let (o, e) = mix.unwrap_or((&dummy, &dummy));
let ob = init("mask-original", &f32_bytes(o), wgpu::BufferUsages::STORAGE);
let eb = init("mask-effected", &f32_bytes(e), wgpu::BufferUsages::STORAGE);
let px_size = if mix.is_some() { (n * 16) as u64 } else { 16 };
let cov_size = (n * 4) as u64;
let out = |label: &str, size: u64| {
d.create_buffer(&wgpu::BufferDescriptor {
label: Some(label),
size,
usage: wgpu::BufferUsages::STORAGE | wgpu::BufferUsages::COPY_SRC,
mapped_at_creation: false,
})
};
let px_b = out("mask-out-px", px_size);
let cov_b = out("mask-out-cov", cov_size);
let bg = d.create_bind_group(&wgpu::BindGroupDescriptor {
label: Some("mask"),
layout: &self.bgl,
entries: &[
wgpu::BindGroupEntry { binding: 0, resource: ub.as_entire_binding() },
wgpu::BindGroupEntry { binding: 1, resource: mb.as_entire_binding() },
wgpu::BindGroupEntry { binding: 2, resource: pb.as_entire_binding() },
wgpu::BindGroupEntry { binding: 3, resource: ob.as_entire_binding() },
wgpu::BindGroupEntry { binding: 4, resource: eb.as_entire_binding() },
wgpu::BindGroupEntry { binding: 5, resource: px_b.as_entire_binding() },
wgpu::BindGroupEntry { binding: 6, resource: cov_b.as_entire_binding() },
],
});
let read = |size: u64| {
d.create_buffer(&wgpu::BufferDescriptor {
label: Some("mask-read"),
size,
usage: wgpu::BufferUsages::COPY_DST | wgpu::BufferUsages::MAP_READ,
mapped_at_creation: false,
})
};
let rc = read(cov_size);
let rp = read(px_size);
let mut enc = d.create_command_encoder(&wgpu::CommandEncoderDescriptor { label: Some("mask") });
{
let mut pass = enc.begin_compute_pass(&wgpu::ComputePassDescriptor { label: Some("mask"), timestamp_writes: None });
pass.set_pipeline(&self.pipeline);
pass.set_bind_group(0, &bg, &[]);
pass.dispatch_workgroups((w as u32).div_ceil(8), (h as u32).div_ceil(8), 1);
}
enc.copy_buffer_to_buffer(&cov_b, 0, &rc, 0, cov_size);
enc.copy_buffer_to_buffer(&px_b, 0, &rp, 0, px_size);
self.queue.submit([enc.finish()]);
let fetch = |b: &wgpu::Buffer| -> Option<Vec<f32>> {
let slice = b.slice(..);
let (tx, rx) = std::sync::mpsc::channel();
slice.map_async(wgpu::MapMode::Read, move |r| {
let _ = tx.send(r);
});
let _ = d.poll(wgpu::PollType::wait_indefinitely());
rx.recv().ok()?.ok()?;
let data = slice.get_mapped_range().ok()?;
let v = data.as_chunks::<4>().0.iter().map(|b| f32::from_le_bytes([b[0], b[1], b[2], b[3]])).collect();
drop(data);
b.unmap();
Some(v)
};
let cov = fetch(&rc)?;
let px = if mix.is_some() { fetch(&rp)? } else { Vec::new() };
Some((cov, px))
}
}