"""
Scene classes
Singleton class to assemble pyECSS::ECSSManager and pyGLV::Viewer objects
"""
from __future__ import annotations
from abc import ABC, abstractmethod
from typing import List, Dict
from pyECSS.ECSSManager import ECSSManager
from pyGLV.GUI.Viewer import SDL2Window, ImGUIDecorator
[docs]class Scene():
"""
Singleton Scene that assembles ECSSManager and Viewer classes together for Scene authoring
in pyglGA. It also brings together the new extensions to pyglGA: Shader, VertexArray and
RenderMeshDecorators
"""
_instance = None
def __new__(cls):
if cls._instance is None:
print('Creating Scene Singleton Object')
cls._instance = super(Scene, cls).__new__(cls)
cls._renderWindow = None
cls._gContext = None
cls._world = ECSSManager() #which also instantiates an EventManager
# add further init here
return cls._instance
def __init__(self):
None;
@property
def renderWindow(self):
return self._renderWindow
@property
def gContext(self):
return self._gContext
@property
def world(self):
return self._world
[docs] def init(self, sdl2 = True, imgui = False, windowWidth = None, windowHeight = None, windowTitle = None,
customImGUIdecorator = None, openGLversion = 4):
"""call the init() of all systems attached to this Scene based on the Visitor pattern
"""
#init Viewer GUI subsystem with just SDL2 window or also an ImGUI decorators
if sdl2 == True:
#create a basic SDL2 RenderWindow with a reference to the Scene and thus ECSSManager and EventManager
self._renderWindow = SDL2Window(windowWidth, windowHeight, windowTitle, self, openGLversion = openGLversion)
self._gContext = self._renderWindow
if imgui == True and customImGUIdecorator == None:
gGUI = ImGUIDecorator(self._renderWindow)
self._gContext = gGUI
elif imgui == True and customImGUIdecorator is not None:
gGUI = customImGUIdecorator(self._renderWindow)
self._gContext = gGUI
print("mark 1");
self._gContext.init()
print("mark 2");
self._gContext.init_post()
[docs] def update(self):
"""call the update() of all systems attached to this Scene based on the Visitor pattern
"""
pass
[docs] def render(self, running:bool = True) ->bool :
"""call the render() of all systems attached to this Scene based on the Visitor pattern
"""
self._gContext.display()
still_runnning = self._gContext.event_input_process(running)
return still_runnning
def render_post(self):
self._gContext.display_post()
[docs] def run(self):
"""main loop Scene method based on the "gameloop" game programming pattern
"""
pass
[docs] def shutdown(self):
"""main shutdown Scene method based on the "gameloop" game programming pattern
"""
self._gContext.shutdown()
if __name__ == "__main__":
# The client singleton code.
s1 = Scene()
s2 = Scene()
if id(s1) == id(s2):
print("Singleton works, both Scenes contain the same instance.")
else:
print("Singleton failed, Scenes contain different instances.")