Unix version demo code print no error but displays nothing

[1847123212]

I run ubuntu 22.04 in VBox verturl machine, and build as readme says
python3 make.py unix DISPLAY=sdl_display INDEV=sdl_pointer

and run demo code as below

from micropython import const  # NOQA
import display_driver_framework

_WIDTH = const(480)
_HEIGHT = const(320)

_BUFFER_SIZE = _WIDTH * _HEIGHT * 3
import lcd_bus  # NOQA

print("Intializing LCD Bus")
bus = lcd_bus.SDLBus(flags=0)

print("Creating buffers")
buf1 = bus.allocate_framebuffer(_BUFFER_SIZE, 0)
buf2 = bus.allocate_framebuffer(_BUFFER_SIZE, 0)

import lvgl as lv  # NOQA

import sdl_display  # NOQA

print("Initializing LVGL")
lv.init()
print("Creating Display")
display = sdl_display.SDLDisplay(
    data_bus=bus,
    display_width=480,
    display_height=320,
    frame_buffer1=buf1,
    frame_buffer2=buf2,
    color_space=lv.COLOR_FORMAT.RGB888
)
print(display)
print("Initializing display")
display.init()

print("Adding display to display driver")
display_driver_framework.DisplayDriver._displays.append(display)

import sdl_pointer

print("Creating SDL pointer")
mouse = sdl_pointer.SDLPointer()
print(mouse)

print("Starting task handler")
import task_handler
th = task_handler.TaskHandler()

print("Activating screen")
scrn = lv.screen_active()
print("Setting screen style")
# the byte order for the hex on this is reversed so a RGB calculator from online needs to swap bits BGR instead of RGB
scrn.set_style_bg_color(lv.color_hex(0x990000), 0)
print("Creating Slider")
slider = lv.slider(scrn)
print("Setting slider size")
slider.set_size(400, 25)
print("Centering slider")
slider.center()


def on_value_changed(_):
    print('VALUE_CHANGED:', slider.get_value())

print("Adding callback to slider")
slider.add_event_cb(on_value_changed, lv.EVENT.VALUE_CHANGED, None)

# import time

# while True:
#     lv.tick_inc(5)
#     lv.timer_handler()
#     time.sleep_ms(5)

but nothing display

[1847123212]

I update the git to main, and rebuild the code, still the same

[kdschlosser]

put the script in the same folder as the binary and then run the binary WITHOUT adding the script file name to the end. Once the REPL opens up then simply import your file.

[kdschlosser]

You mentioned running in a virtual machine.. is X Windows installed in that VM?? No X Windows no GUI so SDL is not going to work.