Kevin Zakka
53883ce86a
PiperOrigin-RevId: 590221484 Change-Id: I07392f9c53f662a37a57ab23acfef9aa5a98a49b
75 lines
2.3 KiB
Python
75 lines
2.3 KiB
Python
# Copyright 2023 DeepMind Technologies Limited
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ==============================================================================
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"""An Apple CGL context for offscreen rendering on macOS."""
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import atexit
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import ctypes
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import os
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from mujoco.cgl import cgl
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_ATTRIB = cgl.CGLPixelFormatAttribute
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_PROFILE = cgl.CGLOpenGLProfile
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class GLContext:
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"""An EGL context for headless accelerated OpenGL rendering on GPU devices."""
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def __init__(self, max_width, max_height):
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del max_width, max_height # unused
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attrib_values = (
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_ATTRIB.CGLPFAOpenGLProfile, _PROFILE.CGLOGLPVersion_Legacy,
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_ATTRIB.CGLPFAColorSize, 24,
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_ATTRIB.CGLPFAAlphaSize, 8,
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_ATTRIB.CGLPFADepthSize, 24,
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_ATTRIB.CGLPFAStencilSize, 8,
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_ATTRIB.CGLPFAMultisample,
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_ATTRIB.CGLPFASampleBuffers, 1,
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_ATTRIB.CGLPFASample, 4,
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_ATTRIB.CGLPFAAccelerated,
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0,
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)
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attribs = (ctypes.c_int * len(attrib_values))(*attrib_values)
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self._pix = cgl.CGLPixelFormatObj()
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npix = cgl.GLint()
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cgl.CGLChoosePixelFormat(
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attribs, ctypes.byref(self._pix), ctypes.byref(npix)
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)
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self._context = cgl.CGLContextObj()
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cgl.CGLCreateContext(self._pix, 0, ctypes.byref(self._context))
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def make_current(self):
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cgl.CGLSetCurrentContext(self._context)
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cgl.CGLLockContext(self._context)
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def free(self):
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"""Frees resources associated with this context."""
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try:
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if self._context:
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cgl.CGLUnlockContext(self._context)
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cgl.CGLSetCurrentContext(None)
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cgl.CGLReleaseContext(self._context)
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self._context = None
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if self._pix:
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cgl.CGLReleasePixelFormat(self._pix)
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self._pix = None
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except Exception: # pylint: disable=broad-exception-caught
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pass
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def __del__(self):
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self.free()
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