piet-wgpu 0.3.0

A hardware-accelerated 2D graphics backend for piet using wgpu
Documentation 
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// SPDX-License-Identifier: LGPL-3.0-or-later OR MPL-2.0
// This file is a part of `piet-hardware`.
//
// `piet-hardware` is free software: you can redistribute it and/or modify it under the
// terms of either:
//
// * GNU Lesser General Public License as published by the Free Software Foundation, either
//   version 3 of the License, or (at your option) any later version.
// * Mozilla Public License as published by the Mozilla Foundation, version 2.
//
// `piet-hardware` is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
// PURPOSE. See the GNU Lesser General Public License or the Mozilla Public License for more
// details.
//
// You should have received a copy of the GNU Lesser General Public License and the Mozilla
// Public License along with `piet-hardware`. If not, see <https://www.gnu.org/licenses/>.

const VERTS = array<vec4<f32>, 6>(
    vec4<f32>(-1.0, -1.0, 0.0, 1.0),
    vec4<f32>(1.0, -1.0, 0.0, 1.0),
    vec4<f32>(-1.0, 1.0, 0.0, 1.0),

    vec4<f32>(1.0, -1.0, 0.0, 1.0),
    vec4<f32>(1.0, 1.0, 0.0, 1.0),
    vec4<f32>(-1.0, 1.0, 0.0, 1.0),
);

@group(0) @binding(0) var<uniform> clearColor: u32;

fn unpack_color(color: u32) -> vec4<f32> {
    return vec4<f32>(
        f32((color >> 0u) & 255u),
        f32((color >> 8u) & 255u),
        f32((color >> 16u) & 255u),
        f32((color >> 24u) & 255u),
    ) / 255.0;
}

@vertex
fn vertex_main(@builtin(vertex_index) in_vertex_index: u32) -> @builtin(position) vec4<f32> {
    var verts: array<vec4<f32>, 6> = VERTS;
    return verts[in_vertex_index];

}

@fragment
fn fragment_main() -> @location(0) vec4<f32> {
    return unpack_color(clearColor);
}