'''OpenGL extension ARB.framebuffer_sRGB
This module customises the behaviour of the
OpenGL.raw.GL.ARB.framebuffer_sRGB to provide a more
Python-friendly API
Overview (from thespec import
Conventionally, OpenGL assumes framebuffer color components are stored
in a linear color space. In particular, framebuffer blending is a
linear operation.
The sRGB color space is based on typical (non-linear) monitor
characteristics expected in a dimly lit office. It has been
standardized by the International Electrotechnical Commission (IEC)
as IEC 61966-2-1. The sRGB color space roughly corresponds to 2.2
gamma correction.
This extension adds a framebuffer capability for sRGB framebuffer
update and blending. When blending is disabled but the new sRGB
updated mode is enabled (assume the framebuffer supports the
capability), high-precision linear color component values for red,
green, and blue generated by fragment coloring are encoded for sRGB
prior to being written into the framebuffer. When blending is enabled
along with the new sRGB update mode, red, green, and blue framebuffer
color components are treated as sRGB values that are converted to
linear color values, blended with the high-precision color values
generated by fragment coloring, and then the blend result is encoded
for sRGB just prior to being written into the framebuffer.
The primary motivation for this extension is that it allows OpenGL
applications to render into a framebuffer that is scanned to a monitor
configured to assume framebuffer color values are sRGB encoded.
This assumption is roughly true of most PC monitors with default
gamma correction. This allows applications to achieve faithful
color reproduction for OpenGL rendering without adjusting the
monitor's gamma correction.
The official definition of this extension is available here:
http://www.opengl.org/registry/specs/ARB/framebuffer_sRGB.txt
'''
from OpenGL import platform,constants,constant,arrays
from OpenGL import extensions,wrapper
from OpenGL.GL import glget
import ctypes
from OpenGL.raw.GL.ARB.framebuffer_sRGB import *
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