Cocos2DX Alpha Mask Fragment Shader

lmap_alpha_mask.frag

#ifdef GL_ES
varying mediump vec2 v_texture_coord;
varying mediump vec2 v_texture_coord1;
#else
varying vec2 v_texture_coord;
varying vec2 v_texture_coord1;
#endif

uniform sampler2D lightmap;
void main(void)
{
    vec4 texel = texture2D(CC_Texture0, v_texture_coord) * (texture2D(lightmap, v_texture_coord1) * 2.0);
    if(texel.a < 0.5)
        discard;
    gl_FragColor = texel;
}