Self-projection Pixel Shader

Image is several times scaled and projected on itself. This concrete GLSL pixel shader projects image on itself 2 times:

---

uniform sampler2D tex;

bool inRectangle(in vec2 xloc, in vec2 loc, in vec2 size) {
  return xloc[0] >= loc[0] && 
  xloc[1] >= loc[1] && 
  xloc[0] <= loc[0]+size[0] && 
  xloc[1] <= loc[1]+size[1];
}

void main()
{
 vec2 start1 = vec2(0.19,0.11);
 vec2 size1 = vec2(0.495,0.285);
 vec2 start2 = start1 + start1*size1; 
 vec2 size2 = size1*size1;
 if (inRectangle(gl_TexCoord[0].xy, start2, size2))
   gl_FragColor = texture2D(tex, (gl_TexCoord[0].xy - start2)/size2);
 else if (inRectangle(gl_TexCoord[0].xy, start1, size1))
   gl_FragColor = texture2D(tex, (gl_TexCoord[0].xy - start1)/size1);
 else
   gl_FragColor = texture2D(tex, gl_TexCoord[0].xy);
}

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Image

and self-projected version of it