#version 410 core

uniform sampler2D textureSampler;
//uniform vec3 lightDir;
uniform vec3 lightPos;
uniform vec3 cameraPos;
uniform vec3 objectColor;

in vec3 fragPos;
in vec3 interpNormal;
in vec2 interpTexCoord;


void main()
{
	vec3 lightDir = normalize(lightPos-fragPos);
	vec3 V = normalize(cameraPos-fragPos);
	vec2 modifiedTexCoord = vec2(interpTexCoord.x, 1.0 - interpTexCoord.y); // Poprawka dla tekstur Ziemi, ktore bez tego wyswietlaja sie 'do gory nogami'
	vec3 color = texture2D(textureSampler, modifiedTexCoord).rgb;
	vec3 normal = normalize(interpNormal);
	float diffuse = max(0,dot(normal,normalize(lightDir)));
	vec3 R = reflect(-normalize(lightDir),normal);
	float ambient = 0.2;
	float specular = pow(max(0,dot(R,V)),1000);
	gl_FragColor = vec4(color*(ambient + (1-ambient)*diffuse)+vec3(1)*specular*0.2, 1.0);
	
}