OpenGL.GL.OML.subsample

OpenGL extension OML.subsample

This module customises the behaviour of the OpenGL.raw.GL.OML.subsample to provide a more Python-friendly API

Overview (from the spec)

Many video image formats and compression techniques utilize various component subsamplings, so it is necessary to provide a mechanism to specify the up- and down-sampling of components as pixel data is drawn from and read back to the client. Though subsampled components are normally associated with the video color space, YCrCb, use of subsampling in OpenGL does not imply a specific color space. Color space conversion may be performed using other extensions or core capabilities such as the color matrix.

This extension defines two new pixel storage formats representing subsampled data on the client. It is loosely based on the SGIX_subsample extension, but specifies subsampling with the data format parameter rather than pixel packing parameters. It also adds support for CYA subsampled data.

When pixel data is received from the client and an unpacking upsampling mode other than PIXEL_SUBSAMPLE_NONE_OML is specified, upsampling is performed via replication, unless otherwise specified by UNPACK_RESAMPLE_OML.

Similarly, when pixel data is read back to the client and a packing downsampling mode other than PIXEL_SUBSAMPLE_NONE_OML is specified, downsampling is performed via simple component decimation (point sampling), unless otherwise specified by PACK_RESAMPLE_OML.

The official definition of this extension is available here: http://www.opengl.org/registry/specs/OML/subsample.txt