'''OpenGL extension APPLE.float_pixels
This module customises the behaviour of the
OpenGL.raw.GL.APPLE.float_pixels to provide a more
Python-friendly API
Overview (from thespec import
This extensions adds texture types, texture internal formats and
color buffers composed of both 32 bit and 16 floating point numbers.
16 bit floats (half float) are very similar to the IEEE
single-precision floating-point standard, except that it has only 5
exponent bits and 10 mantissa bits. All floating point numbers are
clamped to the limits of the range representable by their respective
format.
Specifically, APPLE_float_pixels adds four pieces of functionality
to OpenGL. First, it provides an HALF_APPLE texture type allowing
clients to pass textures in the half float format. Second, it adds
12 additional sized internal formats to allow OpenGL to process and
maintain texture data in the requested format if possible. Next, it
provides the COLOR_FLOAT_APPLE pixel format to allow creation of
floating point and half float color buffers. Lastly, it provides an
additional query to allow clients to verify that they have a
floating point color buffer.
The HALF_APPLE texture type allows clients to use source textures
composed of half float color components. This constant is use in
the type parameter in DrawPixels, ReadPixels and texturing commands
with a corresponding GL half data type, which corresponds to a 16
bit half float, and has no special interpretation.
Clients can use the 12 additional (6 floating point and 6 half
float) sized internal texture formats to specify the mapping of R,
G, B and A values to texture components, as they would with any
other sized internal texture format. Note, as is the standard
practice with OpenGL, implementations should map the sized internal
texture R, G, B and A values to internal components with memory
allocations as close as possible to those specified in the sized
internal format.
Floating point color buffers are created by specifying the
appropriate color floating point pixel format attribute for the
windowing system API in use by the client. Both 128 bit and 64 bit
floating point color buffers can be supported, the former with full
32 bit floating point components and the latter with 16 bit half
float components.
Additionally, clients can query to see if they have a floating point
color buffer using GetBooleanv with COLOR_FLOAT_APPLE as the get
value. The number of bits per color buffer component can be
determined in the usual manner.
The official definition of this extension is available here:
http://www.opengl.org/registry/specs/APPLE/float_pixels.txt
'''
from OpenGL import platform,constants,constant,arrays
from OpenGL import extensions,wrapper
from OpenGL.GL import glget
import ctypes
from OpenGL.raw.GL.APPLE.float_pixels import *
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