| Name |
| |
| MESA_packed_depth_stencil |
| |
| Name Strings |
| |
| GL_MESA_packed_depth_stencil |
| |
| Contact |
| |
| Keith Whitwell, VA Linux Systems Inc. (keithw 'at' valinux.com) |
| Brian Paul, VA Linux Systems Inc. (brianp 'at' valinux.com) |
| |
| Status |
| |
| Obsolete. |
| |
| Version |
| |
| |
| Number |
| |
| ??? |
| |
| Dependencies |
| |
| EXT_abgr affects the definition of this extension |
| SGIS_texture4D affects the definition of this extension |
| EXT_cmyka affects the definition of this extension |
| ARB_packed_pixels affects the definition of this extension |
| |
| Overview |
| |
| Provides a mechanism for DrawPixels and ReadPixels to efficiently |
| transfer depth and stencil image data. Specifically, we defined new |
| packed pixel formats and types which pack both stencil and depth |
| into one value. |
| |
| Issues: |
| |
| 1. Is this the right way to distinguish between 24/8 and 8/24 |
| pixel formats? Should we instead provide both: |
| |
| GL_DEPTH_STENCIL_MESA |
| GL_STENCIL_DEPTH_MESA |
| |
| And perhaps just use GL_UNSIGNED_INT, GL_UNSIGNED_SHORT ? |
| |
| 2. If not, is it correct to use _REV to indicate that stencil |
| preceeds depth in the 1_15 and 8_24 formats? |
| |
| 3. Do we really want the GL_UNSIGNED_SHORT formats? |
| |
| |
| New Procedures and Functions |
| |
| None. |
| |
| New Tokens |
| |
| Accepted by the <format> parameter of ReadPixels and DrawPixels: |
| |
| GL_DEPTH_STENCIL_MESA 0x8750 |
| |
| Accepted by the <type> parameter of ReadPixels and DrawPixels: |
| |
| GL_UNSIGNED_INT_24_8_MESA 0x8751 |
| GL_UNSIGNED_INT_8_24_REV_MESA 0x8752 |
| GL_UNSIGNED_SHORT_15_1_MESA 0x8753 |
| GL_UNSIGNED_SHORT_1_15_REV_MESA 0x8754 |
| |
| 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: |
| |
| Target |
| Format Name Buffer Element Meaning and Order |
| ----------- ------ ------------------------- |
| COLOR_INDEX Color Color index |
| STENCIL_INDEX Stencil Stencil index |
| DEPTH_COMPONENT Depth Depth component |
| RED Color R component |
| GREEN Color G component |
| BLUE Color B component |
| ALPHA Color A component |
| RGB Color R, G, B components |
| RGBA Color R, G, B, A components |
| BGRA Color B, G, R, A components |
| ABGR_EXT Color A, B, G, R components |
| CMYK_EXT Color Cyan, Magenta, Yellow, Black components |
| CMYKA_EXT Color Cyan, Magenta, Yellow, Black, A components |
| LUMINANCE Color Luminance component |
| LUMINANCE_ALPHA Color Luminance, A components |
| DEPTH_STENCIL Depth, Depth component, stencil index. |
| Stencil |
| |
| Table 3.5: DrawPixels and ReadPixels formats. The third column |
| gives a description of and the number and order of elements in a |
| group. |
| |
| Add to the description of packed pixel formats: |
| |
| <type> Parameter Data of Matching |
| Token Name Type Elements Pixel Formats |
| ---------------- ---- -------- ------------- |
| |
| UNSIGNED_BYTE_3_3_2 ubyte 3 RGB |
| UNSIGNED_BYTE_2_3_3_REV ubyte 3 RGB |
| UNSIGNED_SHORT_5_6_5 ushort 3 RGB |
| UNSIGNED_SHORT_5_6_5_REV ushort 3 RGB |
| UNSIGNED_SHORT_4_4_4_4 ushort 4 RGBA,BGRA,ABGR_EXT,CMYK_EXT |
| UNSIGNED_SHORT_4_4_4_4_REV ushort 4 RGBA,BGRA |
| UNSIGNED_SHORT_5_5_5_1 ushort 4 RGBA,BGRA,ABGR_EXT,CMYK_EXT |
| UNSIGNED_SHORT_1_5_5_5_REV ushort 4 RGBA,BGRA |
| UNSIGNED_INT_8_8_8_8 uint 4 RGBA,BGRA,ABGR_EXT,CMYK_EXT |
| UNSIGNED_INT_8_8_8_8_REV uint 4 RGBA,BGRA |
| UNSIGNED_INT_10_10_10_2 uint 4 RGBA,BGRA,ABGR_EXT,CMYK_EXT |
| UNSIGNED_INT_2_10_10_10_REV uint 4 RGBA,BGRA |
| UNSIGNED_SHORT_15_1_MESA ushort 2 DEPTH_STENCIL_MESA |
| UNSIGNED_SHORT_1_15_REV_MESA ushort 2 DEPTH_STENCIL_MESA |
| UNSIGNED_SHORT_24_8_MESA ushort 2 DEPTH_STENCIL_MESA |
| UNSIGNED_SHORT_8_24_REV_MESA ushort 2 DEPTH_STENCIL_MESA |
| |
| UNSIGNED_INT_8_24: |
| |
| 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 |
| +-----------------------+-----------------------------------------------------------------------+ |
| | | | |
| +-----------------------+-----------------------------------------------------------------------+ |
| |
| first second |
| element element |
| |
| |
| UNSIGNED_INT_24_8: |
| |
| 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 |
| +----------------------------------------------------------------------+------------------------+ |
| | | | |
| +----------------------------------------------------------------------+------------------------+ |
| |
| first second |
| element element |
| |
| UNSIGNED_SHORT_15_1: |
| |
| 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 |
| +-----------------------------------------------------------+---+ |
| | | | |
| +-----------------------------------------------------------+---+ |
| |
| first second |
| element element |
| |
| |
| UNSIGNED_SHORT_1_15_REV: |
| |
| 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 |
| +---+-----------------------------------------------------------+ |
| | | | |
| +---+-----------------------------------------------------------+ |
| |
| second first |
| element element |
| |
| The assignment of elements to fields in the packed pixel is as |
| described in the table below: |
| |
| First Second Third Fourth |
| Format Element Element Element Element |
| ------ ------- ------- ------- ------- |
| RGB red green blue |
| RGBA red green blue alpha |
| BGRA blue green red alpha |
| ABGR_EXT alpha blue green red |
| CMYK_EXT cyan magenta yellow black |
| DEPTH_STENCIL_MESA depth stencil |
| |
| Additions to Chapter 4 of the 1.1 Specification (Per-Fragment Operations |
| and the Frame Buffer) |
| |
| 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, ABGR_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, |
| ABGR_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 1.1 Specification (Special Functions) |
| |
| None |
| |
| Additions to Chapter 6 of the 1.1 Specification (State and State Requests) |
| |
| None |
| |
| Additions to the GLX Specification |
| |
| None |
| |
| GLX Protocol |
| |
| TBD |
| |
| Errors |
| |
| None |
| |
| New State |
| |
| None |
| |
| Revision History |
| |
| Version 1.0 - 23 Sep 2000 |
| Keith's original version. |
| |
| Version 1.1 - 3 Nov 2000 |
| Brian's edits, assigned values to new enums. |
| |
