Name

    SUN_slice_accum

Name Strings

    GL_SUN_slice_accum

Contact

    Jack Middleton, Sun (Jack.Middleton 'at' sun.com)

Status

    Shipping (version 1.3)

Version
   
 $Date: 02/03/13 15:15:35  $Revision: 1.3 $

Number

    258

Dependencies

    The extension is written against the OpenGL 1.3 Specification. 

Overview


  This extension defines a new accumulation operation which enables the accumulation
  buffer to be used for alpha compositing. This enables higher precision alpha
  blending than what can be accomplished using the blend operation.

IP Status

  There are no known IP issues.

Issues

  None


New Procedures and Functions

  None

New Tokens

   Accepted by the <op> parameter of Accum,

   SLICE_ACCUM_SUN                0x85CC

Additions to Chapter 2 of the 1.3 GL Specification (OpenGL Operation)

    None 

Additions to Chapter 3 of the 1.3 GL Specification (Rasterization)

    None


Additions to Chapter 4 of the 1.3 GL Specification (Per-Fragment Operations
and the Framebuffer)

    Section 4.2.4 The Accumulation Buffer:

    The possible operations are ACCUM, LOAD, RETURN, MULT, ADD and SLICE_ACCUM_SUN.

    The SLICE_ACCUM_SUN operation has the same effect as ACCUM except that the
    accumulation buffer color value is computed:

    AccumRGB = (FrameBuffAlpha * FrameBuffRGB) + ((1 - FrameBuffAlpha) * AccumRGB)


Additions to Chapter 5 of the 1.3 GL Specification (Special Functions)

    None


Additions to Chapter 6 of the 1.3 GL Specification (State and State Requests)

    None

Additions to the GLX / WGL / AGL Specifications

    None

GLX Protocol

    None

Errors
   
    None
 
New State

    None