#version 330 core

uniform sampler2DRect colorMap;

uniform vec3 camera;
uniform vec2 worldSize;
uniform vec2 screenSize;

in vec2 texCoord;
in vec3 normal;

out vec4 outColor;

vec3 phongLighting(in vec3 kd, in vec3 ks, in float ns, in vec3 color, in vec3 normal, in vec3 lightDir, in vec3 halfVec){
    float diffuseComponent = max(dot(normal, lightDir), 0);
    float specularComponent = max(dot(halfVec, normal), 0);
    return color*diffuseComponent*(kd+ks*pow(specularComponent, ns));
}

void main()
{
    vec2 worldCoord = texCoord*worldSize + camera.xy;
    ivec2 nbRevolutions = ivec2(floor(worldCoord / worldSize));
    if(abs(mod(nbRevolutions.y, 2)) > 0.5)
    {
        worldCoord.x += worldSize.x/2;
        nbRevolutions.x = int(floor(worldCoord.x / worldSize.x));
    }
    worldCoord = worldCoord - nbRevolutions*worldSize;
    vec3 texColor = texelFetch(colorMap, ivec2(worldCoord)).xyz;
    float pseudoLighting = 0.4+dot(normal, normalize(vec3(-0.5))); // TODO : use phong lighting
    outColor = vec4(texColor*pseudoLighting, 1.0);
}