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Runtime error
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import ctypes
import pyglet
__all__ = ['link_GL', 'link_AGL', 'link_GLX', 'link_WGL',
'GLException', 'missing_function', 'decorate_function']
_debug_gl = pyglet.options['debug_gl']
_debug_gl_trace = pyglet.options['debug_gl_trace']
_debug_gl_trace_args = pyglet.options['debug_gl_trace_args']
class MissingFunctionException(Exception):
def __init__(self, name, requires=None, suggestions=None):
msg = '%s is not exported by the available OpenGL driver.' % name
if requires:
msg += ' %s is required for this functionality.' % requires
if suggestions:
msg += ' Consider alternative(s) %s.' % ', '.join(suggestions)
Exception.__init__(self, msg)
def missing_function(name, requires=None, suggestions=None):
def MissingFunction(*args, **kwargs):
raise MissingFunctionException(name, requires, suggestions)
return MissingFunction
_int_types = (ctypes.c_int16, ctypes.c_int32)
if hasattr(ctypes, 'c_int64'):
# Some builds of ctypes apparently do not have c_int64
# defined; it's a pretty good bet that these builds do not
# have 64-bit pointers.
_int_types += (ctypes.c_int64,)
for t in _int_types:
if ctypes.sizeof(t) == ctypes.sizeof(ctypes.c_size_t):
c_ptrdiff_t = t
class c_void(ctypes.Structure):
# c_void_p is a buggy return type, converting to int, so
# POINTER(None) == c_void_p is actually written as
# POINTER(c_void), so it can be treated as a real pointer.
_fields_ = [('dummy', ctypes.c_int)]
class GLException(Exception):
pass
def errcheck(result, func, arguments):
if _debug_gl_trace:
try:
name = func.__name__
except AttributeError:
name = repr(func)
if _debug_gl_trace_args:
trace_args = ', '.join([repr(arg)[:20] for arg in arguments])
print(f'{name}({trace_args})')
else:
print(name)
from pyglet import gl
context = gl.current_context
if not context:
raise GLException('No GL context; create a Window first')
error = gl.glGetError()
if error:
# These are the 6 possible error codes we can get in opengl core 3.3+
error_types = {
gl.GL_INVALID_ENUM: "Invalid enum. An unacceptable value is specified for an enumerated argument.",
gl.GL_INVALID_VALUE: "Invalid value. A numeric argument is out of range.",
gl.GL_INVALID_OPERATION: "Invalid operation. The specified operation is not allowed in the current state.",
gl.GL_INVALID_FRAMEBUFFER_OPERATION: "Invalid framebuffer operation. The framebuffer object is not complete.",
gl.GL_OUT_OF_MEMORY: "Out of memory. There is not enough memory left to execute the command.",
}
msg = error_types.get(error, "Unknown error")
raise GLException(f'(0x{error}): {msg}')
return result
def decorate_function(func, name):
if _debug_gl:
if name not in ('glGetError',) and name[:3] not in ('glX', 'agl', 'wgl'):
func.errcheck = errcheck
link_AGL = None
link_GLX = None
link_WGL = None
if pyglet.compat_platform in ('win32', 'cygwin'):
from pyglet.gl.lib_wgl import link_GL, link_WGL
elif pyglet.compat_platform == 'darwin':
from pyglet.gl.lib_agl import link_GL, link_AGL
else:
from pyglet.gl.lib_glx import link_GL, link_GLX
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