vello_shaders 0.8.0

Vello infrastructure to preprocess and cross-compile shaders at compile time.
Documentation 
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// Copyright 2023 the Vello Authors
// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense

use vello_encoding::{BumpAllocators, IndirectCount};

use super::CpuBinding;

const WG_SIZE: usize = 256;

fn path_tiling_setup_main(bump: &BumpAllocators, indirect: &mut IndirectCount) {
    let segments = bump.seg_counts;
    indirect.count_x = segments.div_ceil(WG_SIZE as u32);
    indirect.count_y = 1;
    indirect.count_z = 1;
}

pub fn path_tiling_setup(_n_wg: u32, resources: &[CpuBinding<'_>]) {
    let bump = resources[0].as_typed();
    let mut indirect = resources[1].as_typed_mut();
    // binding 2 is ptcl, which we would need if we propagate failure
    path_tiling_setup_main(&bump, &mut indirect);
}