https://shinylasers.com/zh-cn/playground
// MIT License
// Copyright (c) 2022 shinylasers.com
// Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all // copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE // SOFTWARE.
struct VertexOutput { @builtin(position) pos: vec4, };
struct DefaultInput { resolution: vec2, time: f32, };
fn sdCircle(p: vec2, r: f32) -> f32 { return length(p) - r; }
fn sdBox(p: vec2, b: vec2) -> f32 { let d = abs(p) - b; return length(max(d, vec2(0.0, 0.0))) + min(max(d.x, d.y), 0.0); }
fn sdBoxRadius(p: vec2, b: vec2, r: f32) -> f32 { let d = abs(p) - b + r; return length(max(d, vec2(0.0, 0.0))) + min(max(d.x, d.y), 0.0) - r; }
@group(0) @binding(0) var si: DefaultInput;
@fragment fn fs_main(in: VertexOutput) -> @location(0) vec4 { // 窗口坐标调整为[-1, 1]，坐标[0, 0]在屏幕中心 let st = (in.pos.xy * 2 - si.resolution) / si.resolution.y; let lineColor = vec3(1.0, 1.0, 1.0); let bgColor = vec3(0.6, 0.6, 0.6);
// let pct = sdCircle(st, 0.5);
// let color = mix(bgColor, lineColor, pct);
// let color = mix(bgColor, lineColor, 1.0 - smoothstep(0.0, 0.01, pct));
// let pct = sdBox(st, vec2<f32>(0.3));
// let color = mix(bgColor, lineColor, 1.0 - smoothstep(0.0, 0.01, pct));
let pct = sdBoxRadius(st, vec2<f32>(0.3), 0.02);
let color = mix(bgColor, lineColor, 1.0 - smoothstep(0.0, 0.01, pct));
return vec4(color, 1.0);
}