232 lines
6.9 KiB
RPMSpec
232 lines
6.9 KiB
RPMSpec
Name
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MESA_packed_depth_stencil
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Name Strings
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GL_MESA_packed_depth_stencil
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Contact
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Keith Whitwell, VA Linux Systems Inc. (keithw 'at' valinux.com)
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Brian Paul, VA Linux Systems Inc. (brianp 'at' valinux.com)
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Status
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Obsolete.
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Version
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$Id: MESA_packed_depth_stencil.spec,v 1.1.1.1 2006/11/25 18:49:28 matthieu Exp $
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Number
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???
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Dependencies
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EXT_abgr affects the definition of this extension
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SGIS_texture4D affects the definition of this extension
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EXT_cmyka affects the definition of this extension
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ARB_packed_pixels affects the definition of this extension
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Overview
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Provides a mechanism for DrawPixels and ReadPixels to efficiently
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transfer depth and stencil image data. Specifically, we defined new
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packed pixel formats and types which pack both stencil and depth
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into one value.
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Issues:
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1. Is this the right way to distinguish between 24/8 and 8/24
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pixel formats? Should we instead provide both:
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GL_DEPTH_STENCIL_MESA
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GL_STENCIL_DEPTH_MESA
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And perhaps just use GL_UNSIGNED_INT, GL_UNSIGNED_SHORT ?
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2. If not, is it correct to use _REV to indicate that stencil
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preceeds depth in the 1_15 and 8_24 formats?
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3. Do we really want the GL_UNSIGNED_SHORT formats?
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New Procedures and Functions
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None.
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New Tokens
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Accepted by the <format> parameter of ReadPixels and DrawPixels:
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GL_DEPTH_STENCIL_MESA 0x8750
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Accepted by the <type> parameter of ReadPixels and DrawPixels:
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GL_UNSIGNED_INT_24_8_MESA 0x8751
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GL_UNSIGNED_INT_8_24_REV_MESA 0x8752
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GL_UNSIGNED_SHORT_15_1_MESA 0x8753
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GL_UNSIGNED_SHORT_1_15_REV_MESA 0x8754
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Additions to Chapter 2 of the 1.1 Specification (OpenGL Operation)
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None
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Additions to Chapter 3 of the 1.1 Specification (Rasterization)
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One entry is added to table 3.5 (DrawPixels and ReadPixels formats).
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The new table is:
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Target
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Format Name Buffer Element Meaning and Order
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----------- ------ -------------------------
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COLOR_INDEX Color Color index
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STENCIL_INDEX Stencil Stencil index
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DEPTH_COMPONENT Depth Depth component
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RED Color R component
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GREEN Color G component
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BLUE Color B component
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ALPHA Color A component
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RGB Color R, G, B components
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RGBA Color R, G, B, A components
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BGRA Color B, G, R, A components
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ABGR_EXT Color A, B, G, R components
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CMYK_EXT Color Cyan, Magenta, Yellow, Black components
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CMYKA_EXT Color Cyan, Magenta, Yellow, Black, A components
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LUMINANCE Color Luminance component
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LUMINANCE_ALPHA Color Luminance, A components
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DEPTH_STENCIL Depth, Depth component, stencil index.
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Stencil
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Table 3.5: DrawPixels and ReadPixels formats. The third column
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gives a description of and the number and order of elements in a
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group.
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Add to the description of packed pixel formats:
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<type> Parameter Data of Matching
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Token Name Type Elements Pixel Formats
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---------------- ---- -------- -------------
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UNSIGNED_BYTE_3_3_2 ubyte 3 RGB
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UNSIGNED_BYTE_2_3_3_REV ubyte 3 RGB
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UNSIGNED_SHORT_5_6_5 ushort 3 RGB
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UNSIGNED_SHORT_5_6_5_REV ushort 3 RGB
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UNSIGNED_SHORT_4_4_4_4 ushort 4 RGBA,BGRA,ABGR_EXT,CMYK_EXT
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UNSIGNED_SHORT_4_4_4_4_REV ushort 4 RGBA,BGRA
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UNSIGNED_SHORT_5_5_5_1 ushort 4 RGBA,BGRA,ABGR_EXT,CMYK_EXT
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UNSIGNED_SHORT_1_5_5_5_REV ushort 4 RGBA,BGRA
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UNSIGNED_INT_8_8_8_8 uint 4 RGBA,BGRA,ABGR_EXT,CMYK_EXT
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UNSIGNED_INT_8_8_8_8_REV uint 4 RGBA,BGRA
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UNSIGNED_INT_10_10_10_2 uint 4 RGBA,BGRA,ABGR_EXT,CMYK_EXT
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UNSIGNED_INT_2_10_10_10_REV uint 4 RGBA,BGRA
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UNSIGNED_SHORT_15_1_MESA ushort 2 DEPTH_STENCIL_MESA
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UNSIGNED_SHORT_1_15_REV_MESA ushort 2 DEPTH_STENCIL_MESA
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UNSIGNED_SHORT_24_8_MESA ushort 2 DEPTH_STENCIL_MESA
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UNSIGNED_SHORT_8_24_REV_MESA ushort 2 DEPTH_STENCIL_MESA
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UNSIGNED_INT_8_24:
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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
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+-----------------------+-----------------------------------------------------------------------+
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+-----------------------+-----------------------------------------------------------------------+
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first second
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element element
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UNSIGNED_INT_24_8:
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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
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+----------------------------------------------------------------------+------------------------+
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+----------------------------------------------------------------------+------------------------+
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first second
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element element
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UNSIGNED_SHORT_15_1:
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15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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+-----------------------------------------------------------+---+
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+-----------------------------------------------------------+---+
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first second
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element element
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UNSIGNED_SHORT_1_15_REV:
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15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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+---+-----------------------------------------------------------+
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+---+-----------------------------------------------------------+
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second first
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element element
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The assignment of elements to fields in the packed pixel is as
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described in the table below:
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First Second Third Fourth
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Format Element Element Element Element
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------ ------- ------- ------- -------
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RGB red green blue
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RGBA red green blue alpha
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BGRA blue green red alpha
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ABGR_EXT alpha blue green red
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CMYK_EXT cyan magenta yellow black
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DEPTH_STENCIL_MESA depth stencil
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Additions to Chapter 4 of the 1.1 Specification (Per-Fragment Operations
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and the Frame Buffer)
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The new format is added to the discussion of Obtaining Pixels from the
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Framebuffer. It should read " If the <format> is one of RED, GREEN,
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BLUE, ALPHA, RGB, RGBA, ABGR_EXT, LUMINANCE, or LUMINANCE_ALPHA, and
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the GL is in color index mode, then the color index is obtained."
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The new format is added to the discussion of Index Lookup. It should
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read "If <format> is one of RED, GREEN, BLUE, ALPHA, RGB, RGBA,
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ABGR_EXT, LUMINANCE, or LUMINANCE_ALPHA, then the index is used to
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reference 4 tables of color components: PIXEL_MAP_I_TO_R,
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PIXEL_MAP_I_TO_G, PIXEL_MAP_I_TO_B, and PIXEL_MAP_I_TO_A."
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Additions to Chapter 5 of the 1.1 Specification (Special Functions)
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None
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Additions to Chapter 6 of the 1.1 Specification (State and State Requests)
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None
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Additions to the GLX Specification
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None
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GLX Protocol
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TBD
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Errors
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None
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New State
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None
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Revision History
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Version 1.0 - 23 Sep 2000
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Keith's original version.
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Version 1.1 - 3 Nov 2000
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Brian's edits, assigned values to new enums.
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