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Python Open Source » Game 2D 3D » PyOpenGL 
PyOpenGL » PyOpenGL 3.0.1 » OpenGL » GL » EXT » texture_integer.py
'''OpenGL extension EXT.texture_integer

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

Overview (from thespec import 
  
  Fixed-point textures in unextended OpenGL have integer components,
  but those values are taken to represent floating-point values in
  the range [0,1].  These integer components are considered
  "normalized" integers.  When such a texture is accessed by a
  shader or by fixed-function fragment processing, floating-point
  values are returned.
  
  This extension provides a set of new "unnormalized" integer texture
  formats.  Formats with both signed and unsigned integers are provided.  In
  these formats, the components are treated as true integers.  When such
  textures are accessed by a shader, actual integer values are returned.
  
  Pixel operations that read from writetoatexturecolor import 
  buffer with unnormalized integer components follow a path similar
  to that used for color index pixel operations, except that more
  than one component may be provided at once.  Integer values flow
  through the pixel processing pipe, and no pixel transfer
  operations are performed.  Integer format enumerants used for such
  operations indicate unnormalized integer data.
  
  Textures or render buffers with unnormalized integer formats may also be
  attached to framebuffer objects to receive fragment color values written
  by a fragment shader.  Per-fragment operations that require floating-point
  color components, including multisample alpha operations, alpha test,
  blending, and dithering, have no effect when the corresponding colors are
  written to an integer color buffer.  The NV_gpu_program4 and
  EXT_gpu_shader4 extensions add the capability to fragment programs and
  fragment shaders to write signed and unsigned integer output values.
  
  This extension does not enforce type consistency for texture accesses or
  between fragment shaders and the corresponding framebuffer attachments.
  The results of a texture lookup from anintegertextureareundefined import 
  
    * for fixed-function fragment processing, or
  
    * for shader texture accesses expecting floating-point return values.  
  
  The color components used for per-fragment operations and written into a
  color buffer are undefined:
  
    * for fixed-function fragment processing with an integer color buffer,
  
    * for fragment shaders that write floating-point color components to an
      integer color buffer, or
  
    * for fragment shaders that write integer color components to a color
      buffer with floating point or normalized integer components.
  

The official definition of this extension is available here:
http://www.opengl.org/registry/specs/EXT/texture_integer.txt
'''
from OpenGL import platform,constants,constant,arrays
from OpenGL import extensions,wrapper
from OpenGL.GL import glget
import ctypes
from OpenGL.raw.GL.EXT.texture_integer import *
### END AUTOGENERATED SECTION
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