opengl.py

import pyglet
from pyglet.gl import *
class CustomGroup(pyglet.graphics.Group):
    def set_state(self):
        glEnable(texture.target)
        glBindTexture(texture.target, texture.id)
    def unset_state(self):
        glDisable(texture.target)
window = pyglet.window.Window()
custom_group = CustomGroup()
batch = pyglet.graphics.Batch()
vertex_list = batch.add(2, pyglet.gl.GL_LINES, custom_group,
    ('v2i', (10, 15, 30, 35)),
    ('c3B', (0, 0, 255, 0, 255, 0))
)
#To remove a vertex list from a batch, call VertexList.delete.

@window.event
def on_draw():
    batch.draw()
    #The Batch ensures that the appropriate set_state and unset_state methods are called before and after the vertex lists that use them.
@window.event
def on_resize(width, height):
    #default
    glViewport(0, 0, width, height)
    glMatrixMode(gl.GL_PROJECTION)
    glLoadIdentity()
    glOrtho(0, width, 0, height, -1, 1)
    glMatrixMode(gl.GL_MODELVIEW)
pyglet.app.run()