#version 330 core

out vec4 FragColor;



in vec2 TexCoords;



uniform sampler2D screenTexture;

uniform vec3 screenSize;

uniform bool screenBurn;



void main()

{

    vec3 col = texture(screenTexture, TexCoords).rgb;

    float scanLine = mod(gl_FragCoord.y, 2.0) * 0.25;

    vec3 scanColor = col.rgb - scanLine;



    if (col.r < 0.1f && col.g < 0.1f && col.b < 0.1f) {

        if (screenBurn) {

            float dist = (1.0 - distance(vec2(gl_FragCoord.x / screenSize.x, gl_FragCoord.y / screenSize.y), vec2(0.5,0.5))) * 0.2;

            FragColor = vec4(0.0, dist, dist, 1.0);

        } else {

            FragColor = vec4(0.0, 0.0, 0.0, 1.0);

        }

    } else {

        FragColor = vec4(scanColor, 1.0);

    }

}