| Name |
| |
| EXT_bgra |
| |
| Name Strings |
| |
| GL_EXT_bgra |
| |
| Version |
| |
| Microsoft revision 1.0, May 19, 1997 (drewb) |
| $Date: 1999/04/03 08:40:34 $ $Revision: 1.4 $ |
| |
| Number |
| |
| 129 |
| |
| Dependencies |
| |
| None |
| |
| Overview |
| |
| 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 |
| |
| New Tokens |
| |
| 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 |
| |
| Revision History |
| |
| Original draft, revision 0.9, October 13, 1995 (drewb) |
| Created |
| Minor revision, revision 1.0, May 19, 1997 (drewb) |
| Removed Microsoft Confidential. |
