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"""OSMesa-specific features |
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To request an OSMesa context, you need to run your script with: |
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PYOPENGL_PLATFORM=osmesa |
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defined in your shell/execution environment. |
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""" |
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import ctypes, ctypes.util |
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from OpenGL.platform import baseplatform, ctypesloader |
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from OpenGL.constant import Constant |
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from OpenGL.raw.osmesa import _types |
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class OSMesaPlatform( baseplatform.BasePlatform ): |
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"""OSMesa implementation for PyOpenGL""" |
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EXPORTED_NAMES = baseplatform.BasePlatform.EXPORTED_NAMES[:] + [ |
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'OSMesa', |
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] |
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@baseplatform.lazy_property |
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def GL(self): |
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try: |
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return ctypesloader.loadLibrary( |
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ctypes.cdll, |
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'OSMesa', |
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mode=ctypes.RTLD_GLOBAL |
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) |
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except OSError as err: |
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raise ImportError("Unable to load OpenGL library", *err.args) |
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@baseplatform.lazy_property |
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def GLU(self): |
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try: |
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return ctypesloader.loadLibrary( |
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ctypes.cdll, |
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'GLU', |
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mode=ctypes.RTLD_GLOBAL |
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) |
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except OSError as err: |
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return None |
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@baseplatform.lazy_property |
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def GLUT( self ): |
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try: |
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return ctypesloader.loadLibrary( |
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ctypes.cdll, |
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'glut', |
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mode=ctypes.RTLD_GLOBAL |
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) |
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except OSError as err: |
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return None |
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@baseplatform.lazy_property |
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def GLE( self ): |
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try: |
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return ctypesloader.loadLibrary( |
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ctypes.cdll, |
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'gle', |
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mode=ctypes.RTLD_GLOBAL |
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) |
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except OSError as err: |
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return None |
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@baseplatform.lazy_property |
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def OSMesa( self ): return self.GL |
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DEFAULT_FUNCTION_TYPE = staticmethod( ctypes.CFUNCTYPE ) |
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@baseplatform.lazy_property |
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def GetCurrentContext( self ): |
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function = self.OSMesa.OSMesaGetCurrentContext |
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function.restype = _types.OSMesaContext |
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return function |
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@baseplatform.lazy_property |
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def CurrentContextIsValid( self ): return self.GetCurrentContext |
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@baseplatform.lazy_property |
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def getExtensionProcedure( self ): |
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function = self.OSMesa.OSMesaGetProcAddress |
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function.restype = ctypes.c_void_p |
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return function |
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def getGLUTFontPointer( self, constant ): |
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"""Platform specific function to retrieve a GLUT font pointer |
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GLUTAPI void *glutBitmap9By15; |
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#define GLUT_BITMAP_9_BY_15 (&glutBitmap9By15) |
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Key here is that we want the addressof the pointer in the DLL, |
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not the pointer in the DLL. That is, our pointer is to the |
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pointer defined in the DLL, we don't want the *value* stored in |
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that pointer. |
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""" |
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name = [ x.title() for x in constant.split( '_' )[1:] ] |
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internal = 'glut' + "".join( [x.title() for x in name] ) |
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pointer = ctypes.c_void_p.in_dll( self.GLUT, internal ) |
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return ctypes.c_void_p(ctypes.addressof(pointer)) |
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