ToME: the Tales of Maj'Eyal

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//fullscreen fragment shader
void main()
{
  gl_FragColor = texture2D(sceneFBO, gl_FragCoord.xy) + texture2D(particleFBO, gl_FragCoord.xy);
  //particleFBO is fullscreen layer that contains your particles
}

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void main()
{
  vec3 distortionColor = texture2D(distortionTexture, gl_FragCoord.xy);
  vec2 distortionOffset = vec2(distortionColor.r - 0.5f, distortionColor.g - 0.5f) * distortionPower;
  //distortionPower is an arbitrary constant
  gl_FragColor = texture2D(sceneFBO, gl_FragCoord.xy + distortionOffset) + texture2D(particleFBO, gl_FragCoord.xy);
}

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void main()
{
  vec2 explosionCenter = vec2(width / 2.0, height / 2.0); // center of the explosion, screenspace coords
  float explosionRadius = 100; // current shockwave radius, can vary with time
  float shockwaveWidth = 10; // current shockwave width, can vary as well
  vec2 centerDist = gl_FragCoord.xy - explosionCenter;
  vec2 distortionOffset = normalize(centerDist) * exp(-length(centerDist) / shockwaveWidth);

  gl_FragColor = vec3(distortionOffset.x, distortionOffset.y, 0) / distortionPower - vec3(0.5, 0.5, 0);
  //distortionPower is the same constant as in previous shader
}

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//regular shockwave
Vector2f GetDistortion(Vector2f point)
{
  Vector2f delta = Vector2f(0.5f, 0.5f) - point;
  float radius = 0.35f;
  float wavelength = 0.01f;
  
  float radialForce = 0.0f;
  float twistForce = 1.0f;
  return (delta.GetNorm() * radialForce + delta.GetPerpendicular() * twistForce).GetNorm() * exp(-pow(fabs(delta.Len() - radius), 2) / wavelength);
}