#version 130
out mediump vec4 color;
in mediump vec2 texcoord;
uniform sampler2D tex;
uniform vec2 cursorPos;
uniform vec2 windowSize;
uniform vec2 screenshotSize;
uniform float flShadow;
uniform float flRadius;
uniform float cameraScale;
uniform bool gridEnabled;

void main()
{
    vec4 cursor = vec4(cursorPos.x, windowSize.y - cursorPos.y, 0.0, 1.0);
    color = mix(
        texture(tex, texcoord), vec4(0.0, 0.0, 0.0, 0.0),
        length(cursor - gl_FragCoord) < (flRadius * cameraScale) ? 0.0 : flShadow);

    if(gridEnabled){
        vec2 uv = texcoord * screenshotSize;
        if(fract(uv.x) < 0.04f || fract(uv.y) < 0.04f)
            color = vec4(0.0);
    }

}