sprites.fragment.glsl

uniform float alphaTest;

varying vec4 vColor;

// Samplers
varying vec2 vUV;
uniform sampler2D diffuseSampler;

void main(void) {
    vec4 color = texture2D(diffuseSampler, vUV);

    if (
        (alphaTest > 0.0 && color.a < alphaTest) ||
        (alphaTest < 0.0 && color.a > alphaTest * -1.0)
        )
        discard;

    gl_FragColor = color;
}