Matrix Greenish Color Formula Demo

 
In the following tweet, iq gives the formula that creates the greenish ambiance of the Matrix movie:

The "Matrix Color" formula. pic.twitter.com/1Iuw9GCQdB

— inigo quilez (@iquilezles) September 23, 2021

 
I coded this small demo that allows you to play with the color exponents:

 
The pixel shader:

#version 120  
uniform sampler2D tex0;
uniform vec4 exponents; // vec4(1.5, 0.8, 1.5, 0.0)

float separator(float mouse_x, float vseparator_width, float uv_x)
{
  float separator_posx = mouse_x;
  float a1 = smoothstep(separator_posx - vseparator_width, separator_posx, uv_x);
  float a2 = smoothstep(separator_posx + vseparator_width, separator_posx, uv_x);
  return 1.0- a1*a2;
}

void main(void)
{
  vec2 uv = gl_TexCoord[0].xy;
  uv.y *= -1.0;

  vec4 color = texture2D(tex0, uv * vec2(2.0, 1.0));

  if (uv.x>0.5)
    color.rgb = pow(color.rgb, exponents.rgb);

  float sep = separator(0.5, 0.01, uv.x);
  gl_FragColor = color * sep;
}