NV_bgr

GL_NV_bgr

Koji Ashida, NVIDIA
Greg Prisament, NVIDIA
Greg Roth, NVIDIA

Greg Roth (groth 'at' nvidia.com)

Last Modified: 07 Jan 2013
NVIDIA Revision: 3

OpenGL ES Extension #135

Complete.

OpenGL ES 2.0 is required.

Written against the OpenGL ES 2.0.25 specification

This extension interacts trivially with NV_texture_array.

NV_bgr extends the list of color formats used in texture images
and reading pixels. Specifically, it adds color formats with BGR
ordering of color channels.

Accepted by the <internalformat> and <format> parameter of
ReadPixels, TexImage2D, TexSubImage2D, TexImage3DNV, and 
TexSubImage3DNV:

    BGR_NV                  0x80E0

Changes to Section 3.6.2 "Transfer of Pixel Rectangles"

Add the following entries to Table 3.3 "TexImage2D and ReadPixels
formats":

    Format Name  Element Meaning and Order   Target Buffer
    -----------  --------------------------  ---------------
    BGR_NV       B,G,R                       Color

Add the following entries to Table 3.4 "Valid pixel format and type
combinations":

    Internal
    Format    Type                    Bytes per Pixel
    --------  ----------------------  ---------------
    BGR_NV    UNSIGNED_BYTE                  3

If NV_texture_array is not supported, ignore references to
TexImage3DNV and TexSubImage3DNV.

Rev.    Date          Author       Changes
----   ------------   ---------    -------------------------------------
 3     07 Jan 2013    groth        Fix minor suffix mistake
 2     23 Oct 2012    groth        Formatting changed. Additional tables.
 1     03 June 2008   kashida      First draft written based on EXT_bgra.