#version 430

layout (binding = 1) uniform sampler2D worldPositionSamp;
layout (binding = 2) uniform sampler2D worldNormalSamp;
layout (binding = 3) uniform sampler2D worldColorSamp;

in vec2 varTextureCoord;
out vec4 color;

vec3 lightPosition = vec3(16, 20, 16);
vec3 lightColor = vec3(1, 1, 1);
uniform vec3 viewPos;

void main()
{             
    // retrieve data from G-buffer
    vec3 FragPos = texture(worldPositionSamp, varTextureCoord).rgb;
    vec3 Normal = texture(worldNormalSamp, varTextureCoord).rgb;
    vec3 Albedo = vec3(1, 1, 1);//texture(gAlbedoSpec, TexCoords).rgb;
    float Specular = 0.7;//texture(gAlbedoSpec, TexCoords).a;
    
    // then calculate lighting as usual
    vec3 lighting = Albedo * 0.1; // hard-coded ambient component
    vec3 viewDir = normalize(viewPos - FragPos);
    //for(int i = 0; i < NR_LIGHTS; ++i)
    //{
        // diffuse
        vec3 lightDir = normalize(lightPosition - FragPos);
        vec3 diffuse = max(dot(Normal, lightDir), 0.0) * Albedo * lightColor;
        lighting += diffuse;
    //}
    
    color = vec4(lighting, 1.0) * texture(worldColorSamp, varTextureCoord);
}