Saran Tunyasuvunakool
6d63e046fd
This allows rendering from non-main threads as the context is not tied to a Cocoa window. Fixes #742 Fixes #798 PiperOrigin-RevId: 523144359 Change-Id: I98432debdd034814c313eda94e38c248c3c1f76c
143 lines
5.1 KiB
Python
143 lines
5.1 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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"""Bindings for Apple CGL."""
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import ctypes
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import enum
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_CGL = ctypes.CDLL('/System/Library/OpenGL.framework/OpenGL')
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CGLContextObj = ctypes.c_void_p
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CGLPixelFormatObj = ctypes.c_void_p
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GLint = ctypes.c_int
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_CGLChoosePixelFormat = _CGL.CGLChoosePixelFormat
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_CGLChoosePixelFormat.argtypes = (
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ctypes.POINTER(ctypes.c_int),
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ctypes.POINTER(CGLPixelFormatObj),
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ctypes.POINTER(GLint),
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)
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_CGLCreateContext = _CGL.CGLCreateContext
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_CGLCreateContext.argtypes = (
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CGLPixelFormatObj,
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ctypes.c_int,
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CGLContextObj,
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)
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_CGLErrorString = _CGL.CGLErrorString
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_CGLErrorString.restype = ctypes.c_char_p
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_CGLErrorString.argtype = (ctypes.c_int,)
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_CGLLockContext = _CGL.CGLLockContext
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_CGLLockContext.argtypes = (CGLContextObj,)
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_CGLReleaseContext = _CGL.CGLReleaseContext
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_CGLReleaseContext.restype = None
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_CGLReleaseContext.argtypes = (CGLContextObj,)
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_CGLReleasePixelFormat = _CGL.CGLReleasePixelFormat
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_CGLReleasePixelFormat.restype = None
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_CGLReleasePixelFormat.argtypes = (CGLPixelFormatObj,)
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_CGLSetCurrentContext = _CGL.CGLSetCurrentContext
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_CGLSetCurrentContext.argtypes = (CGLContextObj,)
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_CGLUnlockContext = _CGL.CGLUnlockContext
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_CGLUnlockContext.argtypes = (CGLContextObj,)
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# pylint: disable=invalid-name
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class CGLOpenGLProfile(enum.IntEnum):
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CGLOGLPVersion_Legacy = 0x1000 # renderer compatible with GL1.0
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CGLOGLPVersion_3_2_Core = 0x3200 # renderer capable of GL3.2 or later
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CGLOGLPVersion_GL3_Core = 0x3200 # renderer capable of GL3.2 or later
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CGLOGLPVersion_GL4_Core = 0x4100 # renderer capable of GL4.1 or later
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class CGLPixelFormatAttribute(enum.IntEnum):
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"""CGLPixelFormatAttribute enum values."""
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CGLPFAAllRenderers = 1 # choose from all available renderers
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CGLPFATripleBuffer = 3 # choose a triple buffered pixel format
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CGLPFADoubleBuffer = 5 # choose a double buffered pixel format
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CGLPFAColorSize = 8 # number of color buffer bits
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CGLPFAAlphaSize = 11 # number of alpha component bits
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CGLPFADepthSize = 12 # number of depth buffer bits
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CGLPFAStencilSize = 13 # number of stencil buffer bits
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CGLPFAMinimumPolicy = 51 # never choose smaller buffers than requested
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CGLPFAMaximumPolicy = 52 # choose largest buffers of type requested
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CGLPFASampleBuffers = 55 # number of multi sample buffers
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CGLPFASample = 56 # number of samples per multi sample buffer
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CGLPFAColorFloat = 58 # color buffers store floating point pixels
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CGLPFAMultisample = 59 # choose multisampling
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CGLPFASupersample = 60 # choose supersampling
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CGLPFASampleAlpha = 61 # request alpha filtering
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CGLPFARendererID = 70 # request renderer by ID
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CGLPFANoRecovery = 72 # disable all failure recovery systems
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CGLPFAAccelerated = 73 # choose a hardware accelerated renderer
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CGLPFAClosestPolicy = 74 # choose the closest color buffer to request
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CGLPFABackingStore = 76 # back buffer contents are valid after swap
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CGLPFABackingVolatile = 77 # back buffer contents are volatile after swap
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CGLPFADisplayMask = 84 # mask limiting supported displays
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CGLPFAAllowOfflineRenderers = 96 # show offline renderers in pixel formats
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CGLPFAAcceleratedCompute = 97 # choose a hardware accelerated compute device
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CGLPFAOpenGLProfile = 99 # specify an OpenGL Profile to use
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CGLPFASupportsAutomaticGraphicsSwitching = 101 # responds to display changes
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CGLPFAVirtualScreenCount = 128 # number of virtual screens in this format
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# Note: the following attributes are deprecated in Core Profile
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CGLPFAAuxBuffers = 7 # number of aux buffers
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CGLPFAAccumSize = 14 # number of accum buffer bits
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CGLPFAAuxDepthStencil = 57 # each aux buffer has its own depth stencil
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CGLPFAStereo = 6
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CGLPFAOffScreen = 53
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CGLPFAWindow = 80
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CGLPFACompliant = 83
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CGLPFAPBuffer = 90
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CGLPFARemotePBuffer = 91
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CGLPFASingleRenderer = 71
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CGLPFARobust = 75
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CGLPFAMPSafe = 78
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CGLPFAMultiScreen = 81
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CGLPFAFullScreen = 54
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# pylint: enable=invalid-name
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class CGLError(RuntimeError): # pylint: disable=g-bad-exception-name
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pass
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def _make_checked(func):
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def checked_func(*args):
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err = func(*args)
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if err:
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raise CGLError(_CGLErrorString(err).decode())
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return checked_func
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CGLChoosePixelFormat = _make_checked(_CGLChoosePixelFormat)
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CGLCreateContext = _make_checked(_CGLCreateContext)
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CGLLockContext = _make_checked(_CGLLockContext)
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CGLReleaseContext = _CGLReleaseContext
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CGLReleasePixelFormat = _CGLReleasePixelFormat
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CGLSetCurrentContext = _make_checked(_CGLSetCurrentContext)
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CGLUnlockContext = _make_checked(_CGLUnlockContext)
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