#! /usr/bin/python3.13

from PIL import Image
import numpy

img    = Image.open("screenshot/bad-el-rave.webp").convert("L")
w, h   = img.size
pxls   = numpy.array(img, dtype=numpy.float32)
z_norm = (pxls / 1024.0) * 2.0 - 1.0

verts = []
for y in range (0, h, 4):
    for x in range (0, w, 4):
        nx = (x / (w - 1.0)) * 2.0 - 1.0
        ny = (y / (h - 1.0)) * 2.0 - 1.0
        nz = float (z_norm [y, x])
        verts.append ([nx, ny, nz, 1.0])

print (';;; -*- lexical-binding: t -*-')

print ('(setf gpu-mesh (vector')

order = 0
i = 0
for v in verts:
    i += 1
    pre = ' '
    pst = ''
    if   (order == 0):
        pre = '[ '
    elif (order == 2):
        pst = ' ]'
    fin = pre + str (v) + pst
    print (fin)
    order = (order + 1) % 3

print ('))')