added glad generator and a glad runtime

tools/glad-0.1.14a0/glad/spec.py

@@ -0,0 +1,54 @@
+from glad.parse import Spec
+
+
+class EGLSpec(Spec):
+    API = 'https://raw.githubusercontent.com/KhronosGroup/EGL-Registry/master/api/'
+    NAME = 'egl'
+
+
+class GLSpec(Spec):
+    API = 'https://raw.githubusercontent.com/KhronosGroup/OpenGL-Registry/master/xml/'
+    NAME = 'gl'
+
+    def __init__(self, root):
+        Spec.__init__(self, root)
+
+        self._profile = 'compatibility'
+        self._remove = set()
+
+    @property
+    def profile(self):
+        return self._profile
+
+    @profile.setter
+    def profile(self, value):
+        if value not in ('core', 'compatibility'):
+            raise ValueError('profile must either be core or compatibility')
+
+        self._profile = value
+
+    @property
+    def removed(self):
+        if self._profile == 'core':
+            return frozenset(self._remove)
+        return frozenset()
+
+
+class GLXSpec(Spec):
+    API = 'https://raw.githubusercontent.com/KhronosGroup/OpenGL-Registry/master/xml/'
+    NAME = 'glx'
+
+
+class WGLSpec(Spec):
+    API = 'https://raw.githubusercontent.com/KhronosGroup/OpenGL-Registry/master/xml/'
+    NAME = 'wgl'
+
+
+SPECS = dict()
+
+# reflection to fill SPECS
+import sys
+import inspect
+for name, cls in inspect.getmembers(sys.modules[__name__], inspect.isclass):
+    if issubclass(cls, Spec):
+        SPECS[cls.NAME] = cls