Screen Transition Textures

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precision mediump float;

varying vec2 uv;

void main() {
  gl_FragColor = vec4(uv.xxx, 1.0);
}

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precision mediump float;

varying vec2 uv;

void main() {
  vec3 color = 1.0 - abs(2.0 * uv.xxx - 1.0);
  gl_FragColor = vec4(color, 1.0);
}

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precision mediump float;

varying vec2 uv;

void main() {
  float distance_from_center = length(2.0 * uv - 1.0);
  vec3 color = vec3(1.0 - distance_from_center);
  gl_FragColor = vec4(color, 1.0);
}

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precision mediump float;

const float sections = 10.0;
varying vec2 uv;

void main() {
  float index = floor(uv.y * sections);
  bool even = mod(index, 2.0) == 0.0;
  if (even) {
    gl_FragColor = vec4(1.0 - uv.xxx, 1.0);
  } else {
    gl_FragColor = vec4(uv.xxx, 1.0);
  }
}