`#version 300 es
 
// fragment shaders don't have a default precision so we need
// to pick one. highp is a good default. It means "high precision"
//Why it is necessary to set precission for the fragment shader? 
//Vertex shader works without this, but fragment shader 
//doesn't work without this code row (as I see). 
// Why the different behaviour exist?  


precision highp float;

uniform vec4 uColor;

in  vec4 vColor;



// we need to declare an output for the fragment shader
out vec4 outColor;

  void main() {
  // Just set the output to a constant reddish-purple

  outColor =  vColor ; //uColor ; 
}`