#ifdef GL_ES
precision mediump float;
#endif

varying vec2 v_texCoord;
varying vec2 v_pos;

uniform sampler2D u_noise;
uniform sampler2D u_texture;

void main() {
    vec4 grassColor = texture2D(u_texture, v_texCoord);
    vec4 noiseColor = texture2D(u_noise, v_pos);

    vec4 color = vec4(noiseColor.r*0.2+grassColor.r/1.2, grassColor.g, grassColor.b, 1.0);
    color.a = grassColor.a;

    gl_FragColor = color;

    if (gl_FragColor.a < 0.7) discard;
}