import pyglet
from pyglet.gl import *
import pyshaders as ps

t = pyglet.window.Window()

v = """
#version 330 core
layout (location = 0) in vec3 aPos;

out vec4 vertexColor;

void main()
{
    gl_Position = vec4(aPos, 1.0);
    vertexColor = vec4(0.5, 0.0, 0.0, 1.0);
}
"""

f = """
#version 330 core
out vec4 FragColor;

in vec4 vertexColor;

void main()
{
    FragColor = vertexColor;
}
"""

shader = ps.from_string(v,f)

@t.event
def on_draw():
    glClearColor(1,0,0,1)
    glClear(GL_COLOR_BUFFER_BIT)
    shader.use()
    glBegin(GL_POLYGON)
    glColor3f(1,1,1)
    glVertex2f(10,10)
    glVertex2f(10,50)
    glVertex2f(60,70)
    glEnd()

def SRO(dt):
    on_draw()

pyglet.clock.schedule_interval(SRO, 1/60)

pyglet.app.run()