darkly 0.5.0

A GPU-native paint engine on wgpu: brushes, layers, blend modes, masks, selections, and undo.
Documentation 
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// Fullscreen triangle vertex shader (shared).
// Generates a triangle that covers the entire screen with no vertex buffer.

struct VertexOutput {
    @builtin(position) position: vec4f,
    @location(0) uv: vec2f,
}

@vertex fn vs_main(@builtin(vertex_index) idx: u32) -> VertexOutput {
    var out: VertexOutput;
    let uv = vec2f(f32((idx << 1u) & 2u), f32(idx & 2u));
    out.position = vec4f(uv * 2.0 - 1.0, 0.0, 1.0);
    // Flip Y for texture sampling (NDC Y is up, texture Y is down)
    out.uv = vec2f(uv.x, 1.0 - uv.y);
    return out;
}