sugarloaf 0.4.3

Sugarloaf is Rio rendering engine, designed to be multiplatform. It is based on WebGPU, Rust library for Desktops and WebAssembly for Web (JavaScript). This project is created and maintained for Rio terminal purposes but feel free to use it.
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#version 450

// Fullscreen triangle, ported from `grid_bg_vertex` in
// `sugarloaf/src/grid/shaders/grid.metal`. One triangle that covers
// the viewport (clipped at the edges); fragment shader does the work.
//
//   gl_VertexIndex 0 → (-1, -3)
//   gl_VertexIndex 1 → (-1,  1)
//   gl_VertexIndex 2 → ( 3,  1)
//
// Drawn with `vkCmdDraw(cmd, 3, 1, 0, 0)` and TRIANGLE_LIST topology.
// No vertex buffers — `gl_VertexIndex` drives everything.

void main() {
    float x = (gl_VertexIndex == 2) ?  3.0 : -1.0;
    float y = (gl_VertexIndex == 0) ? -3.0 :  1.0;
    gl_Position = vec4(x, y, 0.0, 1.0);
}