--- /dev/null
+XXX - Not complete yet!!!
+
+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
+
+ Not yet shipping.
+
+Version
+
+ $Id: MESA_packed_depth_stencil.spec,v 1.1 2000/11/03 14:58:45 brianp Exp $
+
+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.
+
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