"""EGL (cross-platform) platform library"""
import ctypes, ctypes.util
from OpenGL.platform import baseplatform, ctypesloader

class EGLPlatform( baseplatform.BasePlatform ):
    """EGL platform for opengl-es only platforms"""
    @baseplatform.lazy_property
    def GLES1(self):
        try:
            return ctypesloader.loadLibrary(
                ctypes.cdll,
                'GLESv1_CM', # ick
                mode=ctypes.RTLD_GLOBAL 
            )
        except OSError as err:
            return None
    @baseplatform.lazy_property
    def GLES2(self):
        try:
            return ctypesloader.loadLibrary(
                ctypes.cdll,
                'GLESv2', 
                mode=ctypes.RTLD_GLOBAL 
            )
        except OSError as err:
            return None
    @baseplatform.lazy_property
    def GLES3(self):
        # implementers guide says to use the same name for the DLL
        return self.GLES2
    @baseplatform.lazy_property
    def GL(self):
        try:
            return ctypesloader.loadLibrary(
                ctypes.cdll,
                'GL', 
                mode=ctypes.RTLD_GLOBAL 
            )
        except OSError as err:
            return self.GLES2 or self.GLES1
    @baseplatform.lazy_property
    def GLU(self):
        try:
            return ctypesloader.loadLibrary(
                ctypes.cdll,
                'GLU',
                mode=ctypes.RTLD_GLOBAL 
            )
        except OSError as err:
            return None
    @baseplatform.lazy_property
    def GLUT( self ):
        try:
            return ctypesloader.loadLibrary(
                ctypes.cdll,
                'glut', 
                mode=ctypes.RTLD_GLOBAL 
            )
        except OSError as err:
            return None
    @baseplatform.lazy_property
    def OpenGL(self): return self.GL
    
    @baseplatform.lazy_property
    def EGL(self):
        try:
            return ctypesloader.loadLibrary(
                ctypes.cdll,
                'EGL', 
                mode=ctypes.RTLD_GLOBAL 
            )
        except OSError as err:
            raise ImportError("Unable to load EGL library", *err.args)
    @baseplatform.lazy_property
    def getExtensionProcedure( self ):
        eglGetProcAddress = self.EGL.eglGetProcAddress
        eglGetProcAddress.restype = ctypes.c_void_p
        return eglGetProcAddress
    @baseplatform.lazy_property
    def GLE( self ):
        try:
            return ctypesloader.loadLibrary(
                ctypes.cdll,
                'gle', 
                mode=ctypes.RTLD_GLOBAL 
            )
        except OSError as err:
            return None

    DEFAULT_FUNCTION_TYPE = staticmethod( ctypes.CFUNCTYPE )
    @baseplatform.lazy_property
    def GetCurrentContext( self ):
        return self.EGL.eglGetCurrentContext