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OpenGL

ctypes-based OpenGL wrapper for Python

This is the PyOpenGL 3.x tree, it attempts to provide a largely compatible API for code written with the PyOpenGL 2.x series using the ctypes foreign function interface system.

Configuration Variables:

There are a few configuration variables in this top-level module. Applications should be the only code that tweaks these variables, mid-level libraries should not take it upon themselves to disable/enable features at this level. The implication there is that your library code should be able to work with any of the valid configurations available with these sets of flags.

Further, once any entry point has been loaded, the variables can no longer be updated. The OpenGL._confligflags module imports the variables from this location, and once that import occurs the flags should no longer be changed.

ERROR_CHECKING

if set to a False value before importing any OpenGL.* libraries will completely disable error-checking. This can dramatically improve performance, but makes debugging far harder.

This is intended to be turned off *only* in a production environment where you *know* that your code is entirely free of situations where you use exception-handling to handle error conditions, i.e. where you are explicitly checking for errors everywhere they can occur in your code.

Default: True

ERROR_LOGGING

If True, then wrap array-handler functions with error-logging operations so that all exceptions will be reported to log objects in OpenGL.logs, note that this means you will get lots of error logging whenever you have code that tests by trying something and catching an error, this is intended to be turned on only during development so that you can see why something is failing.

Errors are normally logged to the OpenGL.errors logger.

Only triggers if ERROR_CHECKING is True

Default: False

ERROR_ON_COPY

if set to a True value before importing the numpy/lists support modules, will cause array operations to raise OpenGL.error.CopyError if the operation would cause a data-copy in order to make the passed data-type match the target data-type.

This effectively disables all list/tuple array support, as they are inherently copy-based.

This feature allows for optimisation of your application. It should only be enabled during testing stages to prevent raising errors on recoverable conditions at run-time.

Default: False

CONTEXT_CHECKING

if set to True, PyOpenGL will wrap *every* GL and GLU call with a check to see if there is a valid context. If there is no valid context then will throw OpenGL.errors.NoContext. This is an *extremely* slow check and is not enabled by default, intended to be enabled in order to track down (wrong) code that uses GL/GLU entry points before the context has been initialized (something later Linux GLs are very picky about).

Default: False

STORE_POINTERS

if set to True, PyOpenGL array operations will attempt to store references to pointers which are being passed in order to prevent memory-access failures if the pointed-to-object goes out of scope. This behaviour is primarily intended to allow temporary arrays to be created without causing memory errors, thus it is trading off performance for safety.

To use this flag effectively, you will want to first set ERROR_ON_COPY to True and eliminate all cases where you are copying arrays. Copied arrays *will* segfault your application deep within the GL if you disable this feature!

Once you have eliminated all copying of arrays in your application, you will further need to be sure that all arrays which are passed to the GL are stored for at least the time period for which they are active in the GL. That is, you must be sure that your array objects live at least until they are no longer bound in the GL. This is something you need to confirm by thinking about your application's structure.

When you are sure your arrays won't cause seg-faults, you can set STORE_POINTERS=False in your application and enjoy a (slight) speed up.

Note: this flag is *only* observed when ERROR_ON_COPY == True, as a safety measure to prevent pointless segfaults

Default: True

WARN_ON_FORMAT_UNAVAILABLE

If True, generates logging-module warn-level events when a FormatHandler plugin is not loadable (with traceback).

Default: False

FULL_LOGGING

If True, then wrap functions with logging operations which reports each call along with its arguments to the OpenGL.calltrace logger at the INFO level. This is *extremely* slow. You should *not* enable this in production code!

You will need to have a logging configuration (e.g. logging.basicConfig() ) call in your top-level script to see the results of the logging.

Default: False

ALLOW_NUMPY_SCALARS

if True, we will wrap all GLint/GLfloat calls conversions with wrappers that allow for passing numpy scalar values.

Note that this is experimental, *not* reliable, and very slow!

Note that byte/char types are not wrapped.

Default: False

UNSIGNED_BYTE_IMAGES_AS_STRING

if True, we will return GL_UNSIGNED_BYTE image-data as strings, instead of arrays for glReadPixels and glGetTexImage

Default: True

FORWARD_COMPATIBLE_ONLY

only include OpenGL 3.1 compatible entry points. Note that this will generally break most PyOpenGL code that hasn't been explicitly made "legacy free" via a significant rewrite.

Default: False

SIZE_1_ARRAY_UNPACK

if True, unpack size-1 arrays to be scalar values, as done in PyOpenGL 1.5 -> 3.0.0, that is, if a glGenList( 1 ) is done, return a uint rather than an array of uints.

Default: True

USE_ACCELERATE

if True, attempt to use the OpenGL_accelerate package to provide Cython-coded accelerators for core wrapping operations.

Default: True

MODULE_ANNOTATIONS

if True, attempt to annotate alternates() and constants to track in which module they are defined (only useful for the documentation-generation passes, really).

Default: False

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