EXT_bgra
GL_EXT_bgra
Microsoft revision 1.0, May 19, 1997 (drewb)
$Date: 1997/09/22 23:03:13 $ $Revision: 1.1 $
129
None
EXT_bgra extends the list of host-memory color formats.
Specifically, it provides formats which match the memory layout of
Windows DIBs so that applications can use the same data in both
Windows API calls and OpenGL pixel API calls.
   New Procedures and Functions |
None
Accepted by the <format> parameter of DrawPixels, GetTexImage,
ReadPixels, TexImage1D, and TexImage2D:
BGR_EXT 0x80E0
BGRA_EXT 0x80E1
| Additions to Chapter 2 of the 1.1 Specification (OpenGL Operation) |
None
| Additions to Chapter 3 of the 1.1 Specification (Rasterization) |
One entry is added to table 3.5 (DrawPixels and ReadPixels formats).
The new table is:
Name Type Elements Target Buffer
---- ---- -------- ------
COLOR_INDEX Index Color Index Color
STENCIL_INDEX Index Stencil value Stencil
DEPTH_COMPONENT Component Depth value Depth
RED Component R Color
GREEN Component G Color
BLUE Component B Color
ALPHA Component A Color
RGB Component R, G, B Color
RGBA Component R, G, B, A Color
LUMINANCE Component Luminance value Color
LUMINANCE_ALPHA Component Luminance value, A Color
BGR_EXT Component B, G, R Color
BGRA_EXT Component B, G, R, A Color
Table 3.5: DrawPixels and ReadPixels formats. The third column
gives a description of and the number and order of elements in a
group.
| Additions to Chapter 4 of the 1.1 Specification (Per-Fragment Operations and the Framebuffer) |
The new format is added to the discussion of Obtaining Pixels from
the Framebuffer. It should read " If the <format> is one of RED,
GREEN, BLUE, ALPHA, RGB, RGBA, BGR_EXT, BGRA_EXT, LUMINANCE, or
LUMINANCE_ALPHA, and the GL is in color index mode, then the color
index is obtained."
The new format is added to the discussion of Index Lookup. It should
read "If <format> is one of RED, GREEN, BLUE, ALPHA, RGB, RGBA,
BGR_EXT, BGRA_EXT, LUMINANCE, or LUMINANCE_ALPHA, then the index is
used to reference 4 tables of color components: PIXEL_MAP_I_TO_R,
PIXEL_MAP_I_TO_G, PIXEL_MAP_I_TO_B, and PIXEL_MAP_I_TO_A."
| Additions to Chapter 5 of the GL Specification (Special Functions) |
None
| Additions to Chapter 6 of the GL Specification (State and State Requests) |
None
Original draft, revision 0.9, October 13, 1995 (drewb)
Created
Minor revision, revision 1.0, May 19, 1997 (drewb)
Removed Microsoft Confidential.
Removed Microsoft Confidential.
 |  | Last update: November 14, 2006.
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