#ifdef GL_ES
precision highp float;
#endif

varying vec2 vTextureCoord;

uniform sampler2D uSampler;
uniform vec3 wl;
/* Color RGBA  vec4 */
float zero = 0.0;

void main(void) {
	float wmax  = (wl[1] + wl[0]/2.0)/255.0;
	float wmin = zero;
	if (wl[0] > zero)
		wmin = wmax - wl[0];
	else
		wmin = wmax + wl[0];
	wmin = wmin / 255.0;
	float wscale = 1.0 / (wmax - wmin);
	vec4 srcColor = texture2D(uSampler, vec2(vTextureCoord.s, vTextureCoord.t));
	gl_FragColor = vec4((srcColor[0] - wmin) * wscale,(srcColor[1] - wmin) * wscale,(srcColor[2] - wmin) * wscale,1.0);

	/*
	   gl_FragColor = srcColor;
	   */
}