#version 460

// OUT

in vec2 vUV;
out vec4 fragColor;

#include inc_functions.glsl
#include inc_cp437.glsl

uniform sampler2D iTex0;
uniform int iFPS;

void main() {
    vec2 uv = 1 - vUV;
    // vec2 uv = vUV;
    vec3 c = texture(iTex0, uv).xyz;
    c = mix(c, 1 - c, write_int(uv * 20, vec2(0.1, 0.1), iFPS, 2));
    fragColor = vec4(c, 1);
}