1 #version 330 core

     2 

     3 uniform  sampler2D  uTexture;

     4 in       vec2       vTextureXY;

     5 out      vec3       fColor;

     6 

     7 vec3 grayscale(vec3 original) {

     8 	const vec3 luminanceWeighting = vec3(0.2125, 0.7154, 0.0721);

     9 	float luminance = dot(original, luminanceWeighting);

    10 	return vec3(luminance);

    11 }

    12 

    13 void main(){

    14 	fColor = texture(uTexture, vTextureXY).rgb;

    15 	// fColor = grayscale(fColor);

    16 	// fColor *= vec3(0.8, 1., 0.2);

    17 }