Demo to display opengl texture that is read from a file. This code is public domain/CC0.

gltexture.py

SCREEN_SIZE = (800, 600)

import math

from OpenGL.GL import *
from OpenGL.GLU import *

import pygame
from pygame.locals import *
import numpy as np
from scipy import misc

### OpenGL Utility Functions

def resize(width, height):
	
	glViewport(0, 0, width, height)
	glMatrixMode(GL_PROJECTION)
	glLoadIdentity()
	gluPerspective(60.0, float(width)/height, .001, 1000.)
	glMatrixMode(GL_MODELVIEW)
	glLoadIdentity()

def init():
	
	glEnable(GL_DEPTH_TEST)
	glDepthFunc(GL_LEQUAL)
	glClearColor(1.0, 1.0, 1.0, 0.0)

	# set up texturing
	glEnable(GL_TEXTURE_2D)
	glEnable(GL_BLEND)
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)

class GLTexture(object):
	def __init__(self):
		self.num = None

	def __del__(self):
		if self.num is not None:
			glDeleteTextures([self.num])
		self.num = None

	def SetFromMatrix(self, img):
		img = np.array(img)
		rawData = img.astype('uint8').tostring()
		self.SetFromString(rawData, img.shape[1], img.shape[0])

	def SetFromString(self, img, w, h):
		self.num = glGenTextures(1)
		glBindTexture(GL_TEXTURE_2D, self.num)
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB,
			GL_UNSIGNED_BYTE, img)
	
	def Draw(self):
		assert self.num is not None

		glEnable(GL_TEXTURE_2D)
		glBindTexture(GL_TEXTURE_2D, self.num)
		glColor3f(0.98, 0.96, 0.95)

		glBegin(GL_POLYGON)

		glTexCoord2f(0.,1.)
		glVertex(-5.,-5.,0.)

		glTexCoord2f(0.,0.)
		glVertex(-5.,5.,0.)

		glTexCoord2f(1.,0.)
		glVertex(5.,5.,0.)

		glTexCoord2f(1.,1.)
		glVertex(5.,-5.,0.)
		
		glEnd()

### Main Program

def run():
	
	pygame.init()
	screen = pygame.display.set_mode(SCREEN_SIZE, HWSURFACE|OPENGL|DOUBLEBUF)
	
	resize(*SCREEN_SIZE)
	init()
	
	clock = pygame.time.Clock()
	
	glMaterial(GL_FRONT, GL_AMBIENT, (0.1, 0.1, 0.1, 1.0))	
	glMaterial(GL_FRONT, GL_DIFFUSE, (1.0, 1.0, 1.0, 1.0))

	img = misc.imread("CIMG8586.JPG")

	tex = GLTexture()
	tex.SetFromMatrix(img)

	while True:
		
		time_passed = clock.tick()
		time_passed_seconds = time_passed / 1000.

		for event in pygame.event.get():
			if event.type == QUIT:
				return
			if event.type == KEYUP and event.key == K_ESCAPE:
				return

		pressed = pygame.key.get_pressed()

		# Clear the screen, and z-buffer
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
						
		glMatrixMode(GL_MODELVIEW)
		glLoadIdentity()

		gluLookAt(0., 0., 10., # look from camera XYZ
			0., 0., 0., # look target
			0., 1., 0.); # up

		tex.Draw()

		# Show the screen
		pygame.display.flip()

if __name__ == "__main__":
	run()