--- /dev/null
+Name
+
+ MESA_agp_offset
+
+Name Strings
+
+ GLX_MESA_agp_offset
+
+Contact
+
+ Brian Paul, Tungsten Graphics, Inc. (brian 'at' tungstengraphics.com)
+ Keith Whitwell, Tungsten Graphics, Inc. (keith 'at' tungstengraphics.com)
+
+Status
+
+ Shipping (Mesa 4.0.4 and later. Only implemented in particular
+ XFree86/DRI drivers.)
+
+Version
+
+ 1.0
+
+Number
+
+ TBD
+
+Dependencies
+
+ OpenGL 1.0 or later is required
+ GLX_NV_vertex_array_range is required.
+ This extensions is written against the OpenGL 1.4 Specification.
+
+Overview
+
+ This extensions provides a way to convert pointers in an AGP memory
+ region into byte offsets into the AGP aperture.
+ Note, this extension depends on GLX_NV_vertex_array_range, for which
+ no real specification exists. See GL_NV_vertex_array_range for more
+ information.
+
+IP Status
+
+ None
+
+Issues
+
+ None
+
+New Procedures and Functions
+
+ GLuint glXGetAGPOffsetMESA( const GLvoid *pointer )
+
+New Tokens
+
+ None
+
+Additions to the OpenGL 1.4 Specification
+
+ None
+
+Additions to Chapter 3 the GLX 1.4 Specification (Functions and Errors)
+
+ Add a new section, 3.6 as follows:
+
+ 3.6 AGP Memory Access
+
+ On "PC" computers, AGP memory can be allocated with glXAllocateMemoryNV
+ and freed with glXFreeMemoryNV. Sometimes it's useful to know where a
+ block of AGP memory is located with respect to the start of the AGP
+ aperature. The function
+
+ GLuint glXGetAGPOffsetMESA( const GLvoid *pointer )
+
+ Returns the offset of the given memory block from the start of AGP
+ memory in basic machine units (i.e. bytes). If pointer is invalid
+ the value ~0 will be returned.
+
+GLX Protocol
+
+ None. This is a client side-only extension.
+
+Errors
+
+ glXGetAGPOffsetMESA will return ~0 if the pointer does not point to
+ an AGP memory region.
+
+New State
+
+ None
+
+Revision History
+
+ 20 September 2002 - Initial draft
+ 2 October 2002 - finished GLX chapter 3 additions
--- /dev/null
+Name
+
+ MESA_pack_invert
+
+Name Strings
+
+ GL_MESA_pack_invert
+
+Contact
+
+ Brian Paul, Tungsten Graphics, Inc. (brian 'at' tungstengraphics.com)
+ Keith Whitwell, Tungsten Graphics, Inc. (keith 'at' tungstengraphics.com)
+
+Status
+
+ Shipping (Mesa 4.0.4 and later)
+
+Version
+
+ 1.0
+
+Number
+
+ TBD
+
+Dependencies
+
+ OpenGL 1.0 or later is required
+ This extensions is written against the OpenGL 1.4 Specification.
+
+Overview
+
+ This extension adds a new pixel storage parameter to indicate that
+ images are to be packed in top-to-bottom order instead of OpenGL's
+ conventional bottom-to-top order. Only pixel packing can be
+ inverted (i.e. for glReadPixels, glGetTexImage, glGetConvolutionFilter,
+ etc).
+
+ Almost all known image file formats store images in top-to-bottom
+ order. As it is, OpenGL reads images from the frame buffer in
+ bottom-to-top order. Thus, images usually have to be inverted before
+ writing them to a file with image I/O libraries. This extension
+ allows images to be read such that inverting isn't needed.
+
+IP Status
+
+ None
+
+Issues
+
+ 1. Should we also defined UNPACK_INVERT_MESA for glDrawPixels, etc?
+
+ Resolved: No, we're only concerned with pixel packing. There are other
+ solutions for inverting images when using glDrawPixels (negative Y pixel
+ zoom) or glTexImage (invert the vertex T coordinates). It would be easy
+ enough to define a complementary extension for pixel packing in the
+ future if needed.
+
+New Procedures and Functions
+
+ None
+
+New Tokens
+
+ Accepted by the <pname> parameter of PixelStorei and PixelStoref
+ and the <pname> parameter of GetIntegerv, GetFloatv, GetDoublev
+ and GetBooleanv:
+
+ PACK_INVERT_MESA 0x8758
+
+Additions to Chapter 2 of the OpenGL 1.4 Specification (OpenGL Operation)
+
+ None
+
+Additions to Chapter 3 of the OpenGL 1.4 Specification (Rasterization)
+
+ None
+
+Additions to Chapter 4 of the OpenGL 1.4 Specification (Per-Fragment
+Operations and the Frame Buffer)
+
+ Add the following entry to table 4.4 (PixelStore parameters) on page 182:
+
+ Parameter Name Type Initial Value Valid Range
+ ---------------------------------------------------------
+ PACK_INVERT_MESA boolean FALSE TRUE/FALSE
+
+ In the section labeled "Placement in Client Memory" on page 184
+ insert the following text into the paragraph before the sentence
+ that starts with "If the format is RED, GREEN, BLUE...":
+
+ "The parameter PACK_INVERT_MESA controls whether the image is packed
+ in bottom-to-top order (the default) or top-to-bottom order. Equation
+ 3.8 is modified as follows:
+
+ ... the first element of the Nth row is indicated by
+
+ p + Nk, if PACK_INVERT_MESA is false
+ p + k * (H - 1) - Nk, if PACK_INVERT_MESA is true, where H is the
+ image height
+ "
+
+Additions to Chapter 5 of the OpenGL 1.4 Specification (Special Functions)
+
+ None
+
+Additions to Chapter 6 of the OpenGL 1.4 Specification (State and
+State Requests)
+
+ None
+
+Additions to Appendix A of the OpenGL 1.4 Specification (Invariance)
+
+ None
+
+Additions to the AGL/GLX/WGL Specifications
+
+ None
+
+GLX Protocol
+
+ None
+
+Errors
+
+ None
+
+New State
+
+ Add the following entry to table 6.20 (Pixels) on page 235:
+
+ Get Value Type Get Cmd Initial Value Description Sec Attribute
+ --------------------------------------------------------------------------------------------------
+ PACK_INVERT_MESA boolean GetBoolean FALSE Value of PACK_INVERT_MESA 4.3.2 pixel-store
+
+Revision History
+
+ 21 September 2002 - Initial draft
--- /dev/null
+Name
+
+ MESA_ycbcr_texture
+
+Name Strings
+
+ GL_MESA_ycbcr_texture
+
+Contact
+
+ Brian Paul, Tungsten Graphics, Inc. (brian 'at' tungstengraphics.com)
+ Keith Whitwell, Tungsten Graphics, Inc. (keith 'at' tungstengraphics.com)
+
+Status
+
+ Shipping (Mesa 4.0.4 and later)
+
+Version
+
+ 1.0
+
+Number
+
+ TBD
+
+Dependencies
+
+ OpenGL 1.0 or later is required
+ This extensions is written against the OpenGL 1.4 Specification.
+ NV_texture_rectangle effects the definition of this extension.
+
+Overview
+
+ This extension supports texture images in the YCbCr format. There is
+ no support for converting YCbCr images to RGB or vice versa. The
+ intention is for YCbCr image data to be directly sent to the renderer
+ without any pixel transfer operations. Only 2D texture images are
+ supported (not glDrawPixels, glReadPixels, etc).
+
+ A YCbCr pixel (texel) is a 16-bit unsigned short with two components.
+ The first component is luminance (Y). For pixels in even-numbered
+ image columns, the second component is Cb. For pixels in odd-numbered
+ image columns, the second component is Cr. If one were to convert the
+ data to RGB one would need to examine two pixels from columns N and N+1
+ (where N is even) to deduce the RGB color.
+
+IP Status
+
+ None
+
+Issues
+
+ None
+
+New Procedures and Functions
+
+ None
+
+New Tokens
+
+ Accepted by the <internalFormat> and <format> parameters of
+ TexImage2D and TexSubImage2D:
+
+ GL_YCBCR_MESA 0x8757
+
+ Accepted by the <type> parameter of TexImage2D and TexSubImage2D:
+
+ GL_UNSIGNED_SHORT_8_8_MESA 0x85BA /* same as Apple's */
+ GL_UNSIGNED_SHORT_8_8_REV_MESA 0x85BB /* same as Apple's */
+
+Additions to Chapter 2 of the OpenGL 1.4 Specification (OpenGL Operation)
+
+ None
+
+Additions to Chapter 3 of the OpenGL 1.4 Specification (Rasterization)
+
+ In section 3.6.4, Rasterization of Pixel Rectangles, on page 102,
+ add the following to Table 3.8 (Packed pixel formats):
+
+ type Parameter GL Data Number of Matching
+ Token Name Type Components Pixel Formats
+ -------------- ------- ---------- -------------
+ UNSIGNED_SHORT_8_8_MESA ushort 3 YCBCR_422_MESA
+ UNSIGNED_SHORT_8_8_REV_MESA ushort 3 YCBCR_422_MESA
+
+
+ In section 3.6.4, Rasterization of Pixel Rectangles, on page 102,
+ add the following to Table 3.10 (UNSIGNED_SHORT formats):
+
+ UNSIGNED_SHORT_8_8_MESA:
+
+ 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
+ +-------------------------------+-------------------------------+
+ | 1st | 2nd |
+ +-------------------------------+-------------------------------+
+
+ UNSIGNED_SHORT_8_8_REV_MESA:
+
+ 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
+ +-------------------------------+-------------------------------+
+ | 2nd | 1st |
+ +-------------------------------+-------------------------------+
+
+
+ In section 3.6.4, Rasterization of Pixel Rectangles, on page 102,
+ add the following to Table 3.12 (Packed pixel fiedl assignments):
+
+ First Second Third Fourth
+ Format Element Element Element Element
+ ------ ------- ------- ------- -------
+ YCBCR_422_MESA luminance chroma
+
+
+ In section 3.8.1, Texture Image Specification, on page 125, add
+ another item to the list of TexImage2D and TexImage3D equivalence
+ exceptions:
+
+ * The value of internalformat and format may be YCBCR_MESA to
+ indicate that the image data is in YCbCr format. type must
+ be either UNSIGNED_SHORT_8_8_MESA or UNSIGNED_SHORT_8_8_REV_MESA
+ as seen in tables 3.8 and 3.10. Table 3.12 describes the mapping
+ between Y and Cb/Cr to the components.
+ If NV_texture_rectangle is supported target may also be
+ TEXTURE_RECTANGLE_NV or PROXY_TEXTURE_RECTANGLE_NV.
+ All pixel transfer operations are bypassed. The texture is stored as
+ YCbCr, not RGB. Queries of the texture's red, green and blue component
+ sizes will return zero.
+
+
+ In section 3.8.1, Texture Image Specification, on page 126, add
+ another item to the list of TexImage1D and TexImage2D equivalence
+ exceptions:
+
+ * The value of internalformat and format can not be YCBCR_MESA.
+
+
+ In section 3.8.2, Alternate Texture Image Specification Commands, on
+ page 129, insert this paragraph after the first full paragraph on the
+ page:
+
+ "If the internal storage format of the image being updated by
+ TexSubImage2D is YCBCR_MESA then format must be YCBCR_MESA.
+ The error INVALID_OPERATION will be generated otherwise."
+
+
+Additions to Chapter 4 of the OpenGL 1.4 Specification (Per-Fragment
+Operations and the Frame Buffer)
+
+ None
+
+Additions to Chapter 5 of the OpenGL 1.4 Specification (Special Functions)
+
+ None
+
+Additions to Chapter 6 of the OpenGL 1.4 Specification (State and
+State Requests)
+
+ None
+
+Additions to Appendix A of the OpenGL 1.4 Specification (Invariance)
+
+ None
+
+Additions to the AGL/GLX/WGL Specifications
+
+ None
+
+GLX Protocol
+
+ None
+
+Errors
+
+ INVALID_ENUM is generated by TexImage2D if <internalFormat> is
+ MESA_YCBCR but <format> is not MESA_YCBCR.
+
+ INVALID_ENUM is generated by TexImage2D if <format> is MESA_YCBCR but
+ <internalFormat> is not MESA_YCBCR.
+
+ INVALID_VALUE is generated by TexImage2D if <format> is MESA_YCBCR and
+ <internalFormat> is MESA_YCBCR and <border> is not zero.
+
+ INVALID_OPERATION is generated by TexSubImage2D if the internal image
+ format is YCBCR_MESA and format is not YCBCR_MESA.
+
+ INVALID_OPERATION is generated by CopyTexSubImage2D if the internal
+ image is YCBCR_MESA.
+
+New State
+
+ Edit table 6.16 on page 231: change the type of TEXTURE_INTERNAL_FORMAT
+ from n x Z42 to n x Z43 to indicate that internal format may also be
+ YCBCR_MESA.
+
+Revision History
+
+ 20 September 2002 - Initial draft
projects / mesa.git / commitdiff