OpenGL Lights
OpenGL specifies at least 8 light sources
GL_LIGHT0 .. GL_LIGHT7
To get maximum lights in your implementations use: glGetIntegerv(GL_MAX_LIGHTS, GLint *num_lights);
You need to enable each light that you plan to use and enable
OpenGL lighting (they are all disabled by default):
glEnable(GL_LIGHT0); glEnable(GL_LIGHT1); …
glEnable(GL_LIGHTING);