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