precision highp float;
precision mediump float;

uniform sampler2D u_sam_tex;
uniform vec4 u_v4_param;
uniform float u_flt_inv_alpha;
varying float v_flt_txcy;
void main()
{
	vec2 txc = vec2(0,v_flt_txcy);
	txc.x = u_v4_param.x*y*y*y+u_v4_param.y*y*y+u_v4_param.z*y+u_v4_param.w;
	gl_FragColor = texture2D(u_sam_tex, txc);
	gl_FragColor.a *= 1.0-u_flt_inv_alpha;
}