#version 430 core
layout (points) in;
layout (triangle_strip, max_vertices = 4) out;

//in vec4 vBackPoss[];
uniform vec2 lightPos;
uniform mat4 worldMat;

void main()
{
  vec4 posaa = worldMat * vec4(gl_in[0].gl_Position.xy, 0 ,1);
  vec4 posba = worldMat * vec4(gl_in[0].gl_Position.zw, 0 ,1);
  vec2 posa = posaa.xy;
  vec2 posb = posba.xy;

//  vec2 posc = vBackPoss[0].xy;
//  vec2 posd = vBackPoss[0].zw;

  gl_Position = vec4 (posb, 0 , 1);
  EmitVertex();
  gl_Position = vec4 (posb + (200 * (posb - lightPos)), 0 , 1);
  EmitVertex();
  gl_Position = vec4 (posa, 0 , 1);
  EmitVertex();
  gl_Position = vec4 (posa + (200 * (posa - lightPos)), 0 , 1);
  EmitVertex();

  EndPrimitive();
}