Name EXT_texture_type_2_10_10_10_REV Name Strings GL_EXT_texture_type_2_10_10_10_REV Contributors Daniel Ginsburg Gary King Petri Kero I-Gene Leong Tom McReynolds Aaftab Munshi Maurice Ribble Contact Benj Lipchak (benj.lipchak 'at' amd.com) Status Complete. Version Last Modified Date: January 18, 2008 Revision: #6 Number 42 Dependencies This extension is written against the OpenGL ES 2.0 specification. OES_texture_3D affects the definition of this extension. Overview This extension adds a new texture data type, unsigned 2.10.10.10 ABGR, which can be used with RGB or RGBA formats. Issues 1. Should textures specified with this type be renderable? UNRESOLVED: No. A separate extension could provide this functionality. New Procedures and Functions None New Tokens Accepted by the parameter of TexImage2D and TexImage3D: UNSIGNED_INT_2_10_10_10_REV_EXT 0x8368 Additions to Chapter 2 of the OpenGL ES 2.0 Specification (OpenGL Operation) Add a new section 2.8.1 - Unsigned integer 2.10.10.10 texture data formats UNSIGNED_INT_2_10_10_10_REV_EXT texture data format describes a 4-component unsigned (2, 10, 10, 10) format laid out in a 32-bit word as shown. 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 ------------------------------------------------------------------------------------- | a | b | g | r | ------------------------------------------------------------------------------------- This type may be used with RGBA or RGB formats. When used with RGB format, the alpha channel assumes the value 1.0 when expanded, so the 2-bit component in the 2.10.10.10 texture data is ignored in this case. Modifications to table 2.9 (Component conversions) Add the following entries: GLType Conversion of (r, g, b) Conversion of a =============================== ======================= =============== UNSIGNED_INT_2_10_10_10_REV_EXT c / (2^10 - 1) c / (2^2 - 1) Additions to Chapter 3 of the OpenGL ES 2.0 Specification (Rasterization) Modifications to table 3.1 (Texture Image Formats and Types) Add the following entries: Internal External Format Format Type Bytes per Pixel ======== ======== =============================== =============== RGBA RGBA UNSIGNED_INT_2_10_10_10_REV_EXT 4 RGB RGB UNSIGNED_INT_2_10_10_10_REV_EXT 4 Modifications to table 3.2 (Image Types) Add the following entries: UNSIGNED_INT_2_10_10_10_REV_EXT Interactions with OES_texture_3D If OES_texture_3D is not available, references to 3D textures should be omitted. Errors None New State None Revision History #06 01/17/2008 Benj Lipchak Get rid of 10_10_10 format, make 2_10_10_10_REV work with RGBA or RGB. #05 01/15/2008 Benj Lipchak Renamed extension with _REV on the end. #04 01/10/2008 Benj Lipchak UNSIGNED_INT_2_10_10_10_REV_EXT is new token name, swith to 2.10.10.10 ABGR instead of ARGB. #03 01/03/2008 Benj Lipchak Change to multi-vendor EXT extension, change to 2.10.10.10 ARGB format, assigned fresh new token enums. #02 11/19/2007 Benj Lipchak Switch to using AMD suffix for tokens. #01 11/04/2007 Benj Lipchak Created from OES_data_type_10_10_10_2.