codecraft 0.2.0

A minimalist 3D game engine built on parts of Bevy (ECS, color) with wgpu and winit: OpenPBR materials, clustered lighting, a yakui-drawn UI, audio and gamepad haptics; its binary maps any folder, and the symbols of its Rust files, as a 3D wall of boxes
Documentation 
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// What yakui painted, put on the frame.
//
// yakui hands over vertices with positions already in its own frame space --
// (0, 0) top-left to (1, 1) bottom-right -- and colours in linear light. Two
// fragment paths: `fs_main` for geometry and images, whose texture is a
// colour (a flat quad samples a white texel); `fs_text` for lettering, whose
// texture is coverage in one channel. Both write premultiplied alpha, which
// is what the pipelines blend with.

struct VertexInput {
    @location(0) position: vec2<f32>,
    @location(1) texcoord: vec2<f32>,
    @location(2) color: vec4<f32>,
};

struct VertexOutput {
    @builtin(position) position: vec4<f32>,
    @location(0) texcoord: vec2<f32>,
    @location(1) color: vec4<f32>,
};

@group(0) @binding(0) var color_texture: texture_2d<f32>;
@group(0) @binding(1) var color_sampler: sampler;

@vertex
fn vs_main(in: VertexInput) -> VertexOutput {
    var out: VertexOutput;
    // yakui's (0, 0) top-left to (1, 1) bottom-right becomes clip space's
    // (-1, 1) top-left to (1, -1) bottom-right.
    let adjusted = in.position * vec2<f32>(2.0, -2.0) + vec2<f32>(-1.0, 1.0);
    out.position = vec4<f32>(adjusted, 0.0, 1.0);
    out.texcoord = in.texcoord;
    out.color = in.color;
    return out;
}

@fragment
fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
    // The texture is premultiplied on upload; the vertex colour is not, so
    // its alpha is applied here.
    var color = textureSample(color_texture, color_sampler, in.texcoord);
    color *= in.color.a;
    return in.color * color;
}

@fragment
fn fs_text(in: VertexOutput) -> @location(0) vec4<f32> {
    let coverage = textureSample(color_texture, color_sampler, in.texcoord).r;
    let alpha = coverage * in.color.a;
    return vec4<f32>(in.color.rgb * alpha, alpha);
}