#ifdef GL_ES
#define LOWP lowp

precision mediump float;
#else
#define LOWP
#endif
varying LOWP vec4 vColor;
varying vec2 vTexCoord;
uniform sampler2D u_texture;
uniform sampler2D u_texture1;
uniform sampler2D u_mask;
void main(void) {
	vec4 texColor0 = texture2D(u_texture, vTexCoord)+texture2D(u_texture1, vTexCoord);
	vec4 texColor1 = texture2D(u_texture1, vTexCoord);

	float mask = texture2D(u_texture1, vTexCoord).a*texture2D(u_mask, vTexCoord).a;
	//float mask = texture2D(u_texture1, vTexCoord).a*texture2D(u_mask, vTexCoord).a;

	//interpolate the colours based on the mask
	gl_FragColor = vColor * mix(texColor0, texColor1, mask);
}