#version 140

// OUT

in vec2 vUV;
out vec4 fragColor;

#include inc_functions.glsl
#include inc_cp437.glsl

uniform sampler2D iTex0;
uniform int iFPS;
uniform int iDemo;

const int[] demoStr = int[5](0x44, 0x45, 0x4D, 0x4F, 0x00);

void main() {
    // vec2 uv = 1 - vUV;
    vec2 uv = vUV;
    vec3 c = texture(iTex0, uv).xyz;
    c = mix(c, 1. - c, iDemo * write_int(uv * 20., vec2(1.), iFPS, 2));
    c = mix(c, 1. - c, iDemo * write_5(uv * 20., vec2(1., 18.), demoStr));
    fragColor = vec4(c, 1);
}