OpenGL extension ARB.color_buffer_float
This module customises the behaviour of the
OpenGL.raw.GL.ARB.color_buffer_float to provide a more
Overview (from the spec)
The standard OpenGL pipeline is based on a fixed-point pipeline.
While color components are nominally floating-point values in the
pipeline, components are frequently clamped to the range [0,1] to
accomodate the fixed-point color buffer representation and allow
for fixed-point computational hardware.
This extension adds pixel formats or visuals with floating-point
RGBA color components and controls for clamping of color
components within the pipeline.
For a floating-point RGBA pixel format, the size of each float
components is specified using the same attributes that are used
for defining the size of fixed-point components. 32-bit
floating-point components are in the standard IEEE float format.
16-bit floating-point components have 1 sign bit, 5 exponent bits,
and 10 mantissa bits.
Clamping control provides a way to disable certain color clamps
and allow programs, and the fixed-function pipeline, to deal in
unclamped colors. There are controls to modify clamping of vertex
colors, clamping of fragment colors throughout the pipeline, and
for pixel return data.
The default state for fragment clamping is "FIXED_ONLY", which
has the behavior of clamping colors for fixed-point color buffers
and not clamping colors for floating-pont color buffers.
Vertex colors are clamped by default.
The official definition of this extension is available here:
|EXTENSION_NAME = 'GL_ARB_color_buffer_float'|
GL_CLAMP_FRAGMENT_COLOR_ARB = GL_CLAMP_FRAGMENT_COLOR_ARB
GL_CLAMP_READ_COLOR_ARB = GL_CLAMP_READ_COLOR_ARB
GL_CLAMP_VERTEX_COLOR_ARB = GL_CLAMP_VERTEX_COLOR_ARB
GL_FIXED_ONLY_ARB = GL_FIXED_ONLY_ARB
GL_RGBA_FLOAT_MODE_ARB = GL_RGBA_FLOAT_MODE_ARB
__file__ = '/home/mcfletch/pylive/OpenGL/GL/ARB/color_buffer_float.pyc'
__name__ = 'OpenGL.GL.ARB.color_buffer_float'
__package__ = 'OpenGL.GL.ARB'
glClampColorARB = <OpenGL.platform.baseplatform.glClampColorARB object at 0x747d810>