#version 450

// iter16 winding probe vertex shader.
// Captures gl_VertexIndex as a single uint32 per VS invocation.
// With non-LIST topologies + XFB, the spec requires the captured buffer
// to be primitive-decomposed — i.e., MORE outputs than input vertices.
// iter13 fails this: it captures one entry per VS invocation (= one per
// input vertex). iter16 must inject driver-side decomposition so the
// captured stream matches the decomposed primitive sequence.

layout(xfb_buffer = 0, xfb_offset = 0, xfb_stride = 4, location = 0) out uint captured;

void main() {
    gl_Position = vec4(0, 0, 0, 1);
    captured = uint(gl_VertexIndex);
}