| Name |
| |
| ARB_texture_rgb10_a2ui |
| |
| Name Strings |
| |
| GL_ARB_texture_rgb10_a2ui |
| |
| Contact |
| |
| Daniel Koch (daniel 'at' transgaming.com) |
| |
| Contributors |
| |
| Daniel Koch, TransGaming |
| Graham Sellers, AMD |
| Jeff Bolz, NVIDIA |
| Pat Brown, NVIDIA |
| |
| Notice |
| |
| Copyright (c) 2010-2013 The Khronos Group Inc. Copyright terms at |
| http://www.khronos.org/registry/speccopyright.html |
| |
| Status |
| |
| Complete. Approved by the ARB at the 2010/01/22 F2F meeting. |
| Approved by the Khronos Board of Promoters on March 10, 2010. |
| |
| Version |
| |
| Last Modified Date: January 29, 2009 |
| Author Revision: 7 |
| |
| Number |
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| ARB Extension #83 |
| |
| Dependencies |
| |
| This extension is written against the OpenGL 3.2 specification, |
| compatibility profile, but it can apply against previous versions |
| of OpenGL. |
| |
| Requires OpenGL 3.0 or EXT_texture_integer. |
| |
| Overview |
| |
| This extension adds support for the following data format: |
| |
| A new texturing format for unsigned 10.10.10.2 integer textures. |
| |
| OpenGL has supported RGB10 and RGB10_A2 formats for a very long time. |
| This extension provides a variant of RGB10_A2 which supports unsigned |
| integer data (in contrast to the above "unsigned normalized integer" |
| formats). |
| |
| IP Status |
| |
| No known IP claims. |
| |
| New Procedures and Functions |
| |
| None |
| |
| New Tokens |
| |
| Accepted by the <internalFormat> parameter of TexImage1D, TexImage2D, |
| TexImage3D, CopyTexImage1D, CopyTexImage2D, RenderbufferStorage and |
| RenderbufferStorageMultisample: |
| |
| RGB10_A2UI 0x906F |
| |
| Additions to Chapter 3 of the OpenGL 3.2 Specification (Compatibility Profile) (Rasterization) |
| |
| Modify Section 3.7.4 (Transfer of Pixel Rectangles), p. 183 |
| |
| (modify Table 3.8, Packed pixel formats, p. 189, to allow the use of |
| integer pixel formats with some packed pixel types) |
| |
| GL Data # |
| type Parameter Token Name Type Comps Matching Pixel Formats |
| --------------------------- ------ --- ----------------------------- |
| UNSIGNED_BYTE_3_3_2 ubyte 3 RGB, RGB_INTEGER |
| UNSIGNED_BYTE_2_3_3_REV ubyte 3 RGB, RGB_INTEGER |
| UNSIGNED_SHORT_5_6_5 ushort 3 RGB, RGB_INTEGER |
| UNSIGNED_SHORT_5_6_5_REV ushort 3 RGB, RGB_INTEGER |
| UNSIGNED_SHORT_4_4_4_4 ushort 4 RGBA, BGRA, RGBA_INTEGER, |
| BGRA_INTEGER |
| UNSIGNED_SHORT_4_4_4_4_REV ushort 4 RGBA, BGRA, RGBA_INTEGER, |
| BGRA_INTEGER |
| UNSIGNED_SHORT_5_5_5_1 ushort 4 RGBA, BGRA, RGBA_INTEGER, |
| BGRA_INTEGER |
| UNSIGNED_SHORT_1_5_5_5_REV ushort 4 RGBA, BGRA, RGBA_INTEGER, |
| BGRA_INTEGER |
| UNSIGNED_INT_8_8_8_8 uint 4 RGBA, BGRA, RGBA_INTEGER, |
| BGRA_INTEGER |
| UNSIGNED_INT_8_8_8_8_REV uint 4 RGBA, BGRA, RGBA_INTEGER, |
| BGRA_INTEGER |
| UNSIGNED_INT_10_10_10_2 uint 4 RGBA, BGRA, RGBA_INTEGER, |
| BGRA_INTEGER |
| UNSIGNED_INT_2_10_10_10_REV uint 4 RGBA, BGRA, RGBA_INTEGER, |
| BGRA_INTEGER |
| <other rows unchanged> |
| |
| |
| Modify Section 3.9.1 (Texture Image Specification), p 212 |
| |
| (add the following required Texture and renderbuffer color formats, p 216) |
| |
| - RGB10_A2UI |
| |
| (add the following to Table 3.17: "Correspondence of sized internal color |
| formats to base internal formats...", beginning on p 218) |
| |
| Sized Base R G B A Shared |
| Internal Format Internal Format bits bits bits bits bits |
| ----------------------- --------------------- ---- ---- ---- ---- ------ |
| RGB10_A2UI RGBA ui10 ui10 ui10 ui2 |
| |
| |
| New State |
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| None. |
| |
| New Implementation Dependent State |
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| None. |
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| Issues |
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| 1. What should the new enumerant be called? |
| |
| Possibilities include: |
| RGB10A2UI - difficult to read |
| RGB10_A2UI - follows precedence of RGB10_A2 and other UI texture formats, |
| however it could difficult to know at a glace if the the UI applies to |
| both the RGB and A components, or just the A component. |
| RGB10UI_A2UI - follows the precedence of R11F_G11F_B10F |
| RGB10_A2_UI - along the same lines as the _SNORM formats, but divergent |
| from other UI formats. |
| |
| RESOLVED. Using RGB10_A2UI. The UI applies to all 4 components. |
| |
| 2. What should this extension be called? |
| |
| RESOLVED: ARB_texture_rgb10_a2ui, after the new internal format that is |
| added. Early drafts used the name texture_unsigned_10_10_10_2, but this |
| is only somewhat related type that isn't added by this extension. |
| |
| 3. Should this new format be required to be renderable? |
| |
| RESOLVED: Yes. It appears to be renderable in other APIs that are |
| supported by the same hardware, and no hardware vendors have objected. |
| |
| 4. It is possible to load packed 10_10_10_2 unsigned integer data into GL |
| via TexImage without this extension? |
| |
| RESOLVED: No. The EXT_texture_integer extension, as later |
| incorporated into OpenGL 3.0, added new integer pixel format enums |
| (e.g., RGBA_INTEGER) and texture formats (e.g., RGBA16UI). All texture |
| formats added by that extension had a "matching" non-packed format and |
| type combination, so there wasn't a strong need to explicitly support |
| packed pixel types for integer pixel formats. |
| |
| The texture format added by this extension logically maps to a "packed" |
| format/type combination, so we add this support by adding RGB_INTEGER, |
| RGBA_INTEGER, and BGRA_INTEGER (as appropriate) to the list of formats |
| supported by packed pixel data types. |
| |
| Even though we are only adding one "packed" texture format, we chose to |
| allow all packed types with corresponding integer formats for |
| orthogonality. |
| |
| |
| Revision History |
| |
| Rev. Date Author Changes |
| ---- ------------ -------- ------------------------------------------------------ |
| 7 Jan 29, 2010 pbrown Update spec language to explicitly allow |
| packed pixels data types with integer pixel |
| formats; update issue 4 to indicate that |
| packed pixels with integer formats wasn't |
| previously allowed (bug 5674). |
| 6 Jan 26, 2010 pbrown assign enum value |
| 5 Dec 10, 2009 dgkoch de-ARBed new tokens |
| 4 Oct 23, 2009 dgkoch fixed format typo |
| 3 Oct 23, 2009 dgkoch added issue 4, resolved issues 1-3, renamed extension |
| 2 Oct 8, 2009 dgkoch Enum can also be accepted for RenderbufferStorage* |
| 1 Oct 8, 2009 dgkoch Initial revision |
| |
