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"""GLX (x-windows)-specific platform features"""
import ctypes, ctypes.util
from OpenGL.platform import baseplatform, ctypesloader
class GLXPlatform(baseplatform.BasePlatform):
"""Posix (Linux, FreeBSD, etceteras) implementation for PyOpenGL"""
# On Linux (and, I assume, most GLX platforms, we have to load
# GL and GLU with the "global" flag to allow GLUT to resolve its
# references to GL/GLU functions).
@baseplatform.lazy_property
def GL(self):
for name in ('OpenGL', 'GL'):
try:
lib = ctypesloader.loadLibrary(
ctypes.cdll, name, mode=ctypes.RTLD_GLOBAL
)
except OSError as err:
lib = None
if lib:
return lib
raise ImportError("Unable to load OpenGL or GL library")
@baseplatform.lazy_property
def GLU(self):
try:
return ctypesloader.loadLibrary(ctypes.cdll, "GLU", mode=ctypes.RTLD_GLOBAL)
except OSError:
return None
@baseplatform.lazy_property
def GLUT(self):
try:
return ctypesloader.loadLibrary(
ctypes.cdll, "glut", mode=ctypes.RTLD_GLOBAL
)
except OSError:
return None
@baseplatform.lazy_property
def GLX(self):
try:
for name in ('GLX', 'OpenGL', 'GL'):
lib = ctypesloader.loadLibrary(
ctypes.cdll, name, mode=ctypes.RTLD_GLOBAL
)
if lib and getattr(lib, 'glXCreateContext', None):
return lib
except OSError as err:
return self.GL
@baseplatform.lazy_property
def GLES1(self):
try:
return ctypesloader.loadLibrary(
ctypes.cdll, "GLESv1_CM", mode=ctypes.RTLD_GLOBAL # ick
)
except OSError:
return None
@baseplatform.lazy_property
def GLES2(self):
try:
return ctypesloader.loadLibrary(
ctypes.cdll, "GLESv2", mode=ctypes.RTLD_GLOBAL
)
except OSError:
return None
@baseplatform.lazy_property
def GLES3(self):
# implementers guide says to use the same name for the DLL
return self.GLES2
@baseplatform.lazy_property
def EGL(self):
return ctypesloader.loadLibrary(ctypes.cdll, 'EGL')
@baseplatform.lazy_property
def glXGetProcAddressARB(self):
base = self.GLX.glXGetProcAddressARB
base.restype = ctypes.c_void_p
return base
@baseplatform.lazy_property
def getExtensionProcedure(self):
return self.glXGetProcAddressARB
@baseplatform.lazy_property
def GLE(self):
try:
return ctypesloader.loadLibrary(ctypes.cdll, "gle", mode=ctypes.RTLD_GLOBAL)
except OSError:
return None
DEFAULT_FUNCTION_TYPE = staticmethod(ctypes.CFUNCTYPE)
# This loads the GLX functions from the GL .so, not sure if that's
# really kosher...
@baseplatform.lazy_property
def GetCurrentContext(self):
glXGetCurrentContext = self.GLX.glXGetCurrentContext
glXGetCurrentContext.restype = ctypes.c_void_p
return glXGetCurrentContext
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))
@baseplatform.lazy_property
def glGetError(self):
return self.GL.glGetError
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