fix posX = FIX(9), posY = ftofix(12.5);
    fix dirX = FIX(-1), dirY = FIX(0);
    fix planeX = FIX(0), planeY = ftofix(0.9);
    fix time = FIX(0), oldTime = FIX(0);

    fix cameraX, rayPosX, rayPosY, rayDirX, rayDirY, sideDistX, sideDistY, deltaDistX, deltaDistY, perpWallDist, frameTime, moveSpeed, rotSpeed, oldDirX, oldPlaneX;
    int x, y, mapX, mapY, stepX, stepY, hit, side, lineHeight, drawStart, drawEnd;

            cameraX = fdiv(FIX(2 * x), FIX(screenWidth)) - FIX(1);
            rayPosX = posX;
            rayPosY = posY;
            rayDirX = dirX + fmul(planeX, cameraX);
            rayDirY = dirY + fmul(planeY, cameraX);

            mapX = UNFIX(rayPosX);
            mapY = UNFIX(rayPosY);
            deltaDistX = ftofix(SquareRootFloat(fixtof(FIX(1) + fdiv(fmul(rayDirY, rayDirY), fmul(rayDirX, rayDirX)))));
            deltaDistY = ftofix(SquareRootFloat(fixtof(FIX(1) + fdiv(fmul(rayDirX, rayDirX), fmul(rayDirY, rayDirY)))));
            hit = 0;

            if (rayDirX < FIX(0))
            {
                stepX = -1;
                sideDistX = fmul(rayPosX - FIX(mapX), deltaDistX);
            }
            else
            {
                stepX = 1;
                sideDistX = fmul(FIX(mapX + 1) - rayPosX, deltaDistX);
            }
            if (rayDirY < FIX(0))
            {
                stepY = -1;
                sideDistY = fmul(rayPosY - FIX(mapY), deltaDistY);
            }
            else
            {
                stepY = 1;
                sideDistY = fmul(FIX(mapY + 1) - rayPosY, deltaDistY);
            }

            while (hit == 0)
            {
                if (sideDistX < sideDistY)
                {
                    sideDistX += deltaDistX;
                    mapX += stepX;
                    side = 0;
                }
                else
                {
                    sideDistY += deltaDistY;
                    mapY += stepY;
                    side = 1;
                }

                if (worldMap[mapX][mapY] > 0) hit = 1;
            }