#version 330 core

layout(location = 0) in vec3 position;
layout(location = 1) in vec3 normal;

uniform vec3 lightPositions[8];

uniform mat4 modelMatrix;
uniform mat4 viewMatrix;
uniform mat4 projectionMatrix;

uniform mat4 lightMatrix;

out vec3 surfaceNormal;
out vec3 toLight[8];
out vec3 toCamera;

void main(void){

    vec4 vertex = vec4(position, 1.0);
    vec4 vertexNormal = vec4(normal, 0.0);

    //Vertexberechnung
    vec4 worldPosition = modelMatrix * vertex;
    gl_Position = projectionMatrix * viewMatrix  * worldPosition;

    mat4 normalMatrix = transpose(inverse(viewMatrix * modelMatrix));
    surfaceNormal = (normalMatrix * vertexNormal).xyz;

    vec4 vertexPosition = (viewMatrix * modelMatrix * vertex);
    toCamera = (vertexPosition * -1).xyz;

    //Berechnung der Vectoren zu den Lichtquellen
    for(int i = 0; i < 8; i++){
        vec4 lightPos = vec4(lightPositions[i], 1.0);
        toLight[i] = ((viewMatrix * lightPos) - vertexPosition).xyz;
    }

}