Added resource loaders and Manager

game/__init__.py

@@ -31,6 +31,8 @@ def start():
     t = gbe.time.Time()
     t.reset()
 
+    resources = gbe.resource.Manager()
+
     gbe.events.Events.listen("QUIT", _OnQuit)
     gbe.events.Events.listen("KEYDOWN", _OnKeyEvent)
     gbe.events.Events.listen("KEYUP", _OnKeyEvent)

game/gbe/__init__.py

@@ -8,3 +8,4 @@ from . import time
 from . import display
 from . import events
 from . import nodes
+from . import resource

game/gbe/resource.py

@@ -0,0 +1,158 @@
+
+
+import os, sys
+import json
+import weakref
+import pygame
+from .resourceLoaders import *
+
+
+class ResourceError(Exception):
+    pass
+
+_GAME_PATH=calculate_real_path(os.path.dirname(sys.argv[0]))
+
+_RESOURCES={}
+
+def define_resource_type(rtype, sub_path, loader_fn):
+    global _RESOURCES, _GAME_PATH, join_path
+    if rtype in _RESOURCES:
+        raise ResourceError("Resource '{}' already defined.".format(rtype))
+    fullpath = join_path(_GAME_PATH, sub_path)
+    if not os.path.isdir(fullpath):
+        print("'{}' | '{}'".format(_GAME_PATH, fullpath))
+        raise ResourceError("'{}' is not a valid directory.".format(sub_path))
+    if not callable(loader_fn):
+        raise ResourceError("Expected a callable as the resource loader.")
+    _RESOURCES[rtype]={"r":[], "loader":loader_fn, "path":fullpath}
+
+
+def configure(conf):
+    global _RESOURCES, join_path
+    if not isinstance(conf, dict):
+        raise TypeError("Expected a dictionary.")
+    for key in conf:
+        if key in _RESOURCES:
+            fullpath = join_path(_GAME_PATH, conf[key])
+            if not os.path.isdir(fullpath):
+                raise ResourceError("'{}' is not a valid directory.".format(conf[key]))
+            _RESOURCES[key]["path"] = fullpath
+            _RESOURCES[key]["r"] = [] # Completely drop old list.
+
+class Manager:
+    def __init__(self):
+        pass
+
+    @property
+    def game_path(self):
+        global _GAME_PATH
+        return _GAME_PATH 
+
+    @property
+    def resource_types(self):
+        global _RESOURCES
+        rtypes = []
+        for key in _RESOURCES:
+            rtypes.append(key)
+        return rtypes
+
+    def _getResourceDict(self, rtype, src):
+        global _RESOURCES
+        if rtype in _RESOURCES:
+            for r in _RESOURCES[rtype]["r"]:
+                if r["src"] == src:
+                    return r
+        return None
+
+    def has(self, rtype, src):
+        return (self._getResourceDict(rtype, src) is not None)
+
+    def store(self, rtype, src):
+        global _RESOURCES
+        if type not in _RESOURCES:
+            raise ResourceError("Unknown resource type '{}'.".format(rtype))
+        if self._getResourceDict(rtype, src) == None:
+            _RESOURCES[rtype]["r"].append({"src":src, "instance":None, "locked":False})
+        return self
+
+    def remove(self, rtype, src):
+        global _RESOURCES
+        d = self._getResourceDict(rtype, src)
+        if d is None:
+            raise ResourceError("No '{}' resource '{}' stored.".format(rtype, src))
+        _RESOURCES[rtype]["r"].remove(d)
+        return self
+
+    def clear(self, rtype, src, ignore_lock):
+        d = self._getResourceDict(rtype, src)
+        if d is None:
+            raise ResourceError("No '{}' resource '{}' stored.".format(rtype, src))
+        if d["locked"] == False or ignore_lock == True:
+            d["instance"] = None
+        return self
+
+    def get(self, rtype, src):
+        global _RESOURCES
+        if rtype not in _RESOURCES:
+            raise ResourceError("Unknown resource type '{}'.".format(rtype))
+        d = self._getResourceDict(rtype, src)
+        if d is None:
+            raise ResourceError("No '{}' resource '{}' stored.".format(rtype, src))
+        if d["instance"] is None:
+            loader = _RESOURCES[rtype]["loader"]
+            filename = join_path(self.data_path, src)
+            try:
+                d["instance"] = loader(filename)
+            except Exception as e:
+                raise e
+        return weakref.ref(d["instance"])
+
+    def lock(self, rtype, src, lock=True):
+        d = self._getResourceDict(rtype, src)
+        if d is None:
+            raise ResourceError("No '{}' resource '{}' stored.".format(rtype, src))
+        d["locked"]=lock
+        return self
+
+    def is_locked(self, rtype, src):
+        d = self._getResourceDict(rtype, src)
+        if d is not None and d["src"] == src:
+            return d["locked"]
+        return False
+
+    def clear_resource_type(self, rtype, ignore_lock=False):
+        global _RESOURCES
+        if rtype in _RESOURCES:
+            for r in _RESOURCES[rtype]["r"]:
+                if r["locked"] == False or ignore_lock == True:
+                    r["instance"] = None
+        return self
+
+    def clear_resources(self, ignore_lock=False):
+        global _RESOURCES
+        for key in _RESOURCES:
+            self.clear_resource_type(key, ignore_lock)
+        return self
+
+    def remove_resource_type(self, rtype):
+        global _RESOURCES
+        if rtype not in _RESOURCES:
+            raise ResourceError("Unknown resource type '{}'.".format(rtype))
+        _RESOURCES[rtype]["r"] = []
+        return self
+
+    def remove_resources(self):
+        global _RESOURCES
+        for key in _RESOURCES:
+            _RESOURCES[key]["r"] = []
+        return self
+
+
+# ---------------------------------------------------------------
+# Defining the built-in loaders located in resourceLoaders.py
+# ---------------------------------------------------------------
+define_resource_type("graphic", "graphics/", load_image)
+define_resource_type("audio", "audio/", load_audio)
+define_resource_type("json", "data/json/", load_JSON)
+
+

game/gbe/resourceLoaders.py

@@ -0,0 +1,52 @@
+import os
+import pygame
+
+
+class LoadError(Exception):
+    pass
+
+def calculate_real_path(path):
+    path = os.path.expandvars(os.path.expanduser(path))
+    path = os.path.realpath(path)
+    path = os.path.abspath(path)
+    return os.path.normcase(os.path.normpath(path))
+def join_path(lpath, rpath):
+    return os.path.normcase(os.path.normpath(os.path.join(lpath, rpath)))
+
+
+
+
+
+def load_image(filename):
+    if not os.path.isfile(filename):
+        raise LoadError("Failed to load '{}'. Path missing or invalid.".format(filename))
+    with open(filename) as f:
+        try:
+            i = pygame.image.load(f, filename)
+            return i.convert_alpha()
+        except pygame.error as e:
+            raise LoadError("Pygame/SDL Exception: {}".format(e.message))
+
+
+def load_audio(filename):
+    if not os.path.isfile(filename):
+        raise LoadError("Failed to load '{}'. Path missing or invalid.".format(filename))
+    try:
+        return pygame.mixer.Sound(filename)
+    except pygame.error as e:
+        raise LoadError("Pygame Exception: {}".format(e.message))
+
+
+
+def load_JSON(filename):
+    if not os.path.isfile(filename):
+        raise LoaderError("File '{}' is missing or not a file.".format(filename))
+    data = None
+    try:
+        with open(filename) as f:
+            data = json.load(f)
+        return data
+    except Exception as e:
+        raise e
+
+