谁能帮我解释这个灯光函数?

mzw1987

void delineation::light0()
{
    GLfloat light_position[] = {1.0,10.0,-51.0,10.0};
        glLightfv(GL_LIGHT0, GL_POSITION, light_position);
        glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);
        glEnable(GL_DEPTH_TEST);
        glEnable(GL_COLOR_MATERIAL);
}