#version 330 core
layout (location = 0) in vec3 vin;
layout (location = 1) in vec2 vtx;
uniform mat4 MVP;

out float depth;


void main() {
    gl_Position = MVP * vec4(vin, 1.0);

    // stencil mode
    depth = 1;
    if(gl_Position.z<-50) {
        depth = -1;
    }

    // depth mode
    //depth = gl_Position.z;
    //depth = gl_Position.z / gl_Position.w; // Linearize if need
}