precision highp float;
precision mediump float;

uniform sampler2D u_sam_tex;
uniform vec3 u_v3_clr;
uniform float u_flt_inv_alpha;
varying vec2 v_v2_txc;
#define offset (1.0/512)
void main()
{
	float alpha = texture2D(u_sam_tex, v_v2_txc).a;
	gl_FragColor = vec4(u_v3_clr.r, u_v3_clr.g, u_v3_clr.b, (1.0-u_flt_inv_alpha)*alpha);
}