Module cocos.draw

'''
void main() {
    vec2 pos = gl_TexCoord[0].st;
    float res = pos.x*pos.x - pos.y;
    if (res<0.0) {
        gl_FragColor = gl_Color;
    } else {
        gl_FragColor = vec4(0.0,0.0,0.0,0.0);
...