precision highp float;

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uniform float time;

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uniform vec2 mouse;

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uniform sampler2D tex;

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varying vec2 vTexCoord;

​

void main() {

  vec2 uv = vTexCoord;

  // Flip the texture coords

  uv.y = 1.0 - uv.y;

  vec4 color = texture2D(tex, uv);

  float red = color.r;

  red = step(0.5, red);

  // Invert the colors

  // color.rgb = 1.0 - color.rgb;

  // color = color * color * color;

  // color.rgb = pow(color.rgb, vec3(1.2));

  color.rgb += sin(color.rgb * 8.0);

  // color.rgb = fract(color.rgb * 3.0);

  // color.rgb = color.rrr;

  // color.rgb = step(mouse.x, color.rgb);

  // color.rgb = smoothstep(mouse.x, mouse.x + 0.2, color.rgb);

  // float t = fract(time);

  // color.rgb = step(t, color.rgb);

  gl_FragColor = color;

  gl_FragColor.a = 1.0;

}