Проблема с pygame.su

import pygame
from settings import *
import math
from map import map_set
 
def mapping(a, b):
    return (a// TILE) * TILE, (b // TILE) * TILE
 
def cast(sc, player_pos, player_angle, texture):
    ox, oy = player_pos
    xm, ym = mapping(ox, oy)
    cur_angle = player_angle - HALF_FOV
    for ray in range(NUM_RAYS):
        cos_a = math.cos(cur_angle)
        sin_a = math.sin(cur_angle)
        x, dx = (xm + TILE, 1) if cos_a >=0 else (xm, -1)
        for i in range(0, WIDTH, TILE):
            depth_v = (x - ox) / cos_a
            vy = oy + depth_v * sin_a
            if mapping(x + dx, vy) in map_set:
                break
            x += dx * TILE
        y, dy = (ym + TILE, 1) if sin_a >= 0 else (ym, -1)
        for i in range(0, HEIGHT, TILE):
            depth_h = (y - oy) / sin_a
            hx = ox + depth_h * cos_a
            if mapping(hx, y + dy) in map_set:
                break
            y += dy * TILE
 
        depth, offset = (depth_v, vy) if depth_v < depth_h else (depth_h, hx)
        offset = int(offset) / TILE
        depth = max(depth, 0.0001)
        proj_height = min(int(PROJ_COEFF / depth), 2 * HEIGHT)
        wall = texture.Surface.subsurface(offset * TEXTURE_SCALE, 0, TEXTURE_SCALE, TEXTURE_HEIGHT)
        wall = pygame.transform.scale(wall, (SCALE, proj_height))
        sc.blit(wall, (ray * SCALE, HALF_HEIGHT - proj_height // 2, SCALE, proj_height))
        cur_angle += DELTA_ANGLE