## vertex shader

uniform float x_mult;

void main()
{
  gl_FrontColor = gl_Color;
  gl_TexCoord[0] = gl_MultiTexCoord0;

  gl_Position = ftransform();
  gl_Position.x += sin(gl_Position.x + x_mult);
}

## fragment shader

void main()
{
  const float asd = 10.0;
  float fog = clamp(abs(gl_FragDepth), 0.0, asd) / asd;
  gl_FragColor = mix(gl_Color, vec4(0.0, 0.0, 0.0, 0.0), fog);
}