#version 450 core
layout(local_size_x= 20, local_size_y=1) in;
layout(rgba8, binding = 5) uniform restrict writeonly image2D img_output;
layout (std140, binding = 1) uniform LightsBlock
{
    vec4 posBool[20];
    vec4 colRad[20];
} ;
layout (binding = 0) uniform sampler2D posTexture;
layout (binding = 1) uniform sampler2D normals;
void main ()
{
    shared vec3[20] larray;
    uint i = gl_LocalInvocationID.x;
    vec3 lightamount = vec3(0,0,0);
    ivec2 pixel_coords = ivec2(gl_WorkGroupID.xy);
    vec2 tex_coords = vec2((4*pixel_coords.x+4)/800.0, (4*pixel_coords.y+4)/835.0);
    vec3 pos = texture(posTexture,tex_coords).xyz;
    vec3 lightPos = posBool[i].xyz;
    vec4 lumRad = colRad[i];
    vec3 distVec = lightPos - pos;
    float dist = dot (distVec,distVec);
    if (dist > lumRad.a) { }
    else 
    {
        float x = 1 - dist / lumRad.a;
        vec3 norm = texture(normals,tex_coords).xyz;
        float y1 = dot(normalize(norm), normalize(distVec));
        float y = float(y1 > 0 ? 0 : 1);
        lightamount = y*x*lumRad.rgb;

    }
      larray[i] = lightamount;
    if (i == 0)
        {   vec3 inverselight = 1 - lightamount;
        //{   vec3 inverselight = vec3(0,0,0);
            for (uint j=1 ; j < 20; ++j) {inverselight = inverselight * (1 - larray[j]);}
            imageStore(img_output, pixel_coords, vec4(inverselight,1));
        }
}