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# -*- coding: utf-8 -*-
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
"""GL ES 2.0 API implemented via pyOpenGL library. Intended as a
fallback and for testing.
"""
from OpenGL import GL as _GL
import OpenGL.GL.framebufferobjects as _FBO
from ...util import logger
from . import _copy_gl_functions
from ._constants import * # noqa
def _patch():
"""Monkey-patch pyopengl to fix a bug in glBufferSubData."""
import sys
from OpenGL import GL
if sys.version_info > (3,):
buffersubdatafunc = GL.glBufferSubData
if hasattr(buffersubdatafunc, 'wrapperFunction'):
buffersubdatafunc = buffersubdatafunc.wrapperFunction
_m = sys.modules[buffersubdatafunc.__module__]
_m.long = int
# Fix missing enum
try:
from OpenGL.GL.VERSION import GL_2_0
GL_2_0.GL_OBJECT_SHADER_SOURCE_LENGTH = GL_2_0.GL_SHADER_SOURCE_LENGTH
except Exception:
pass
# Patch OpenGL package
_patch()
# Inject
def _make_unavailable_func(funcname):
def cb(*args, **kwargs):
raise RuntimeError('OpenGL API call "%s" is not available.' % funcname)
return cb
def _get_function_from_pyopengl(funcname):
"""Try getting the given function from PyOpenGL, return
a dummy function (that shows a warning when called) if it
could not be found.
"""
func = None
# Get function from GL
try:
func = getattr(_GL, funcname)
except AttributeError:
# Get function from FBO
try:
func = getattr(_FBO, funcname)
except AttributeError:
func = None
# Try using "alias"
if not bool(func):
# Some functions are known by a slightly different name
# e.g. glDepthRangef, glClearDepthf
if funcname.endswith('f'):
try:
func = getattr(_GL, funcname[:-1])
except AttributeError:
pass
# Set dummy function if we could not find it
if func is None:
func = _make_unavailable_func(funcname)
logger.warning('warning: %s not available' % funcname)
return func
def _inject():
"""Copy functions from OpenGL.GL into _pyopengl namespace."""
NS = _pyopengl2.__dict__
for glname, ourname in _pyopengl2._functions_to_import:
func = _get_function_from_pyopengl(glname)
NS[ourname] = func
from . import _pyopengl2 # noqa
# Inject remaining functions from OpenGL.GL
# copies name to _pyopengl2 namespace
_inject()
# Inject all function definitions in _pyopengl2
_copy_gl_functions(_pyopengl2, globals())
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