#version 330 core

uniform  sampler2D  uTexture;
in       vec2       vTextureXY;
out      vec4       fColor;

vec4 grayscale(vec4 original) {
	const vec3 luminanceWeighting = vec3(0.2125, 0.7154, 0.0721);
	float luminance = dot(original.rgb, luminanceWeighting);
	return vec4(vec3(luminance), original.a);
}

void main(){
	fColor = texture(uTexture, vTextureXY).rgba;
	// fColor = grayscale(fColor);
	// fColor *= vec4(0.8, 1., 0.2, 1.);

	if (fColor.a < 0.1) discard;
}