from pyglet.gl import *
import Image

window = pyglet.window.Window()
glEnable(GL_DEPTH_TEST)
glEnable(GL_TEXTURE_2D)

heightmap = Image.open('andes-height.png')
width, height = heightmap.size
vlists = []
for row in range(height-1):
    vl = pyglet.graphics.vertex_list(width*2, ('v3f', [0]*3*width*2), ('t2f', [0]*2*width*2))
    i = 0
    j = 0
    for col in range(width):
        vl.vertices[i] = (col/(width-1.0) - 0.5) * 100.0
        vl.vertices[i+2] = (row/(height-1.0) - 0.5) * 100.0
        vl.vertices[i+1] = heightmap.getpixel((col,row))/255.0 * 50.0
        vl.vertices[i+3] = (col/(width-1.0) - 0.5) * 100.0
        vl.vertices[i+5] = ((row+1)/(height-1.0) - 0.5) * 100.0
        vl.vertices[i+4] = heightmap.getpixel((col,row+1))/255.0 * 50.0
        i += 6
        vl.tex_coords[j] = col/(width-1.0)
        vl.tex_coords[j+1] = row/(height-1.0)
        vl.tex_coords[j+2] = col/(width-1.0)
        vl.tex_coords[j+3] = (row+1)/(height-1.0)
        j += 4
    vlists.append(vl)

texture = pyglet.image.load('andes-left.png').get_texture()

rotAngle = 0

@window.event
def on_draw():
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()
    gluPerspective(60.0, float(window.width)/window.height, 1, 1000)
    glMatrixMode(GL_MODELVIEW)
    glLoadIdentity()
    glTranslatef(0, -30, -100)
    glRotatef(-rotAngle, 0, 1, 0)
    glBindTexture(GL_TEXTURE_2D, texture.id)
    for v in vlists:
        v.draw(GL_TRIANGLE_STRIP)

def update(dt):
    global rotAngle
    rotAngle += 90*dt

pyglet.clock.schedule_interval(update,1/60.0)
pyglet.app.run()