uniform vec3 colorStart;
uniform vec3 colorEnd;

uniform float useDash;
uniform float dashArray;
uniform float dashOffset;
uniform float dashRatio;
uniform sampler2D alphaMap;
uniform float useAlphaMap;

varying vec2 vUV;
varying vec4 vColor;
varying float vCounters;

vec4 CustomLinearTosRGB( in vec4 value ) {
	return vec4( mix( pow( value.rgb, vec3( 0.41666 ) ) * 1.055 - vec3( 0.055 ), value.rgb * 12.92, vec3( lessThanEqual( value.rgb, vec3( 0.0031308 ) ) ) ), value.a );
}

void main()	{

  vec4 c = mix(vec4(colorStart,1.0),vec4(colorEnd, 1.0), vCounters);

	if( useAlphaMap == 1. ) c.a *= texture2D( alphaMap, vUV ).r;

	if( useDash == 1. ){
		c.a *= ceil(mod(vCounters + dashOffset, dashArray) - (dashArray * dashRatio));
	}

	gl_FragColor = CustomLinearTosRGB(c);
}