#version 430 core
out vec4 FragColor;

in VS_OUT {
    vec3 FragPos;
    vec2 TexCoords;
    vec3 TangentLightPos;
    vec3 TangentViewPos;
    vec3 TangentFragPos;
} fs_in;

uniform sampler2D diffuseMap;
uniform sampler2D normalMap;
uniform sampler2D depthMap;
  
uniform float height_scale;
  
vec2 ParallaxMapping(vec2 texCoords, vec3 viewDir);
  
void main()
{           
    // offset texture coordinates with Parallax Mapping
    vec3 viewDir   = normalize(fs_in.TangentViewPos - fs_in.TangentFragPos);
    vec2 texCoords = ParallaxMapping(fs_in.TexCoords,  viewDir);

    // then sample textures with new texture coords
    vec3 diffuse = texture(diffuseMap, texCoords);
    vec3 normal  = texture(normalMap, texCoords);
    normal = normalize(normal * 2.0 - 1.0);
    // proceed with lighting code
     
}