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      1 varying vec2 texCoord;
      2 
      3 attribute vec3 inPosition;
      4 attribute vec2 inTexCoord;
      5 
      6 void main(){
      7    texCoord = inTexCoord;
      8    vec4 pos = vec4(inPosition, 1.0);
      9    gl_Position = vec4(sign(pos.xy-vec2(0.5)), 0.0, 1.0);
     10 }