#version 450 core
layout(early_fragment_tests) in;
layout (std140, binding = 1) uniform TheLight { vec4 lightPos; vec4 lumRad; };
layout (binding = 0) uniform sampler2D posTexture;
layout (binding = 1) uniform sampler2D normals;
in vec2 vTexPos;
out vec4 fColor;
float rad = lumRad.a;
void main() {
  vec3 pos = texture(posTexture, vTexPos).xyz;
  vec3 distVec = pos - lightPos.xyz;
  float dist = dot(distVec, distVec);
  vec3 norm = texture(normals, vTexPos).xyz;
  float y1 = dot(norm, distVec);
  float y2 = float(y1 > 0 ? 1 : 0.2);
  //bool t = pos.z > lightPos.z && norm.z > 0;
  //float y2 = float(y1 > 0 || t ? 1 : 0.1);
  float x = 1 - (pow(dist / rad,4));
  vec3 c = y2* x * lumRad.rgb;
  fColor = vec4(c, 0);
}