1#version 430
2
3layout(location = 0) in vec4 in_position;
4layout(location = 1) in vec4 in_color;
5layout(location = 2) in int in_refVertexIndex;
6
7layout(location = 0) out vec4 out_color;
8
9out gl_PerVertex {
10    vec4 gl_Position;
11};
12
13void main() {
14	gl_Position = in_position;
15	if (gl_VertexIndex == in_refVertexIndex)
16		out_color = in_color;
17	else
18		out_color = vec4(1.0, 0.0, 0.0, 1.0);
19}