precision mediump float;

uniform sampler2D u_sam_tex;
uniform sampler2D u_sam_tex_mask;
uniform float u_flt_inv_alpha;
varying vec2 v_v2_txc;
varying vec2 v_v2_txc_mask;
void main()
{
	if(v_v2_txc_mask.y < 0.0)discard;
	if(v_v2_txc_mask.y > 1.0)discard;
	float alpha = texture2D(u_sam_tex_mask, v_v2_txc_mask).a;
	gl_FragColor = texture2D(u_sam_tex, v_v2_txc);
	gl_FragColor.a *= alpha*(1.0-u_flt_inv_alpha);
}