#version 330
#extension GL_ARB_separate_shader_objects : enable

layout(location=1) in vec2 fsTex;
layout(location=0) out vec4 target;

uniform sampler2D mainTex;

void main()
{
    float x = fsTex.x;

	if (x < 0.0 || x > 1.0)
    {
		target = vec4(0);
        return;
    }

	vec4 mainColor = texture(mainTex, vec2(x,fsTex.y));
    target = vec4(0.0, 0.0, 0.0, mainColor.a);
}