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