sugarloaf 0.0.29

Sugarloaf is Rio rendering engine, desgined to be multiplatform. It is based on WebGPU, Rust library for Desktops and WebAssembly for Web (JavaScript). This project is created and maintaned for Rio terminal purposes but feel free to use it.
Documentation 
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struct Globals {
    transform: mat4x4<f32>,
}

@group(0) @binding(0) var<uniform> globals: Globals;
@group(0) @binding(1) var font_sampler: sampler;
@group(0) @binding(2) var font_tex: texture_2d<f32>;

struct VertexInput {
    @builtin(vertex_index) vertex_index: u32,
    @location(0) left_top: vec3<f32>,
    @location(1) right_bottom: vec2<f32>,
    @location(2) tex_left_top: vec2<f32>,
    @location(3) tex_right_bottom: vec2<f32>,
    @location(4) color: vec4<f32>,
}

struct VertexOutput {
    @builtin(position) position: vec4<f32>,
    @location(0) f_tex_pos: vec2<f32>,
    @location(1) f_color: vec4<f32>,
}

@vertex
fn vs_main(input: VertexInput) -> VertexOutput {
    var out: VertexOutput;

    var pos: vec2<f32> = vec2<f32>(0.0, 0.0);
    var left: f32 = input.left_top.x;
    var right: f32 = input.right_bottom.x;
    var top: f32 = input.left_top.y;
    var bottom: f32 = input.right_bottom.y;

    switch (i32(input.vertex_index)) {
        case 0: {
            pos = vec2<f32>(left, top);
            out.f_tex_pos = input.tex_left_top;
        }
        case 1: {
            pos = vec2<f32>(right, top);
            out.f_tex_pos = vec2<f32>(input.tex_right_bottom.x, input.tex_left_top.y);
        }
        case 2: {
            pos = vec2<f32>(left, bottom);
            out.f_tex_pos = vec2<f32>(input.tex_left_top.x, input.tex_right_bottom.y);
        }
        case 3: {
            pos = vec2<f32>(right, bottom);
            out.f_tex_pos = input.tex_right_bottom;
        }
        default: {}
    }

    out.f_color = input.color;
    out.position = globals.transform * vec4<f32>(pos, input.left_top.z, 1.0);

    return out;
}

@fragment
fn fs_main(input: VertexOutput) -> @location(0) vec4<f32> {
    var alpha: f32 = textureSample(font_tex, font_sampler, input.f_tex_pos).r;

    if (alpha <= 0.0) {
        discard;
    }

    return input.f_color * vec4<f32>(1.0, 1.0, 1.0, alpha);
}