let pos : array, 3> = array, 3>(vec2(0.0, 0.5), vec2(-0.5, -0.5), vec2(0.5, -0.5)); @stage(vertex) fn vtx_main(@builtin(vertex_index) VertexIndex : u32) -> @builtin(position) vec4 { return vec4(pos[VertexIndex], 0.0, 1.0); } @stage(fragment) fn frag_main() -> @location(0) vec4 { return vec4(1.0, 0.0, 0.0, 1.0); }