Remove squish build and project files.
This commit is contained in:
castano
parent
a4dcd414ca
commit
0805832b44
@ -1,31 +0,0 @@
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include config
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SRC = alpha.cpp clusterfit.cpp colourblock.cpp colourfit.cpp colourset.cpp maths.cpp rangefit.cpp singlecolourfit.cpp squish.cpp
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OBJ = $(SRC:%.cpp=%.o)
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LIB = libsquish.a
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all : $(LIB)
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install : $(LIB)
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install squish.h $(INSTALL_DIR)/include
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install libsquish.a $(INSTALL_DIR)/lib
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uninstall:
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$(RM) $(INSTALL_DIR)/include/squish.h
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$(RM) $(INSTALL_DIR)/lib/libsquish.a
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$(LIB) : $(OBJ)
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$(AR) cr $@ $?
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ranlib $@
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%.o : %.cpp
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$(CXX) $(CPPFLAGS) -I. $(CXXFLAGS) -o$@ -c $<
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clean :
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$(RM) $(OBJ) $(LIB)
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@ -1,531 +0,0 @@
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// !$*UTF8*$!
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{
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archiveVersion = 1;
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classes = {
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};
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objectVersion = 42;
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objects = {
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||||
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||||
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|
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|
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|
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|
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|
||||
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|
||||
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@ -1,508 +0,0 @@
|
||||
Name
|
||||
|
||||
EXT_texture_compression_s3tc
|
||||
|
||||
Name Strings
|
||||
|
||||
GL_EXT_texture_compression_s3tc
|
||||
|
||||
Contact
|
||||
|
||||
Pat Brown, NVIDIA Corporation (pbrown 'at' nvidia.com)
|
||||
|
||||
Status
|
||||
|
||||
FINAL
|
||||
|
||||
Version
|
||||
|
||||
1.1, 16 November 2001 (containing only clarifications relative to
|
||||
version 1.0, dated 7 July 2000)
|
||||
|
||||
Number
|
||||
|
||||
198
|
||||
|
||||
Dependencies
|
||||
|
||||
OpenGL 1.1 is required.
|
||||
|
||||
GL_ARB_texture_compression is required.
|
||||
|
||||
This extension is written against the OpenGL 1.2.1 Specification.
|
||||
|
||||
Overview
|
||||
|
||||
This extension provides additional texture compression functionality
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||||
specific to S3's S3TC format (called DXTC in Microsoft's DirectX API),
|
||||
subject to all the requirements and limitations described by the extension
|
||||
GL_ARB_texture_compression.
|
||||
|
||||
This extension supports DXT1, DXT3, and DXT5 texture compression formats.
|
||||
For the DXT1 image format, this specification supports an RGB-only mode
|
||||
and a special RGBA mode with single-bit "transparent" alpha.
|
||||
|
||||
IP Status
|
||||
|
||||
Contact S3 Incorporated (http://www.s3.com) regarding any intellectual
|
||||
property issues associated with implementing this extension.
|
||||
|
||||
WARNING: Vendors able to support S3TC texture compression in Direct3D
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||||
drivers do not necessarily have the right to use the same functionality in
|
||||
OpenGL.
|
||||
|
||||
Issues
|
||||
|
||||
(1) Should DXT2 and DXT4 (premultiplied alpha) formats be supported?
|
||||
|
||||
RESOLVED: No -- insufficient interest. Supporting DXT2 and DXT4
|
||||
would require some rework to the TexEnv definition (maybe add a new
|
||||
base internal format RGBA_PREMULTIPLIED_ALPHA) for these formats.
|
||||
Note that the EXT_texture_env_combine extension (which extends normal
|
||||
TexEnv modes) can be used to support textures with premultipled alpha.
|
||||
|
||||
(2) Should generic "RGB_S3TC_EXT" and "RGBA_S3TC_EXT" enums be supported
|
||||
or should we use only the DXT<n> enums?
|
||||
|
||||
RESOLVED: No. A generic RGBA_S3TC_EXT is problematic because DXT3
|
||||
and DXT5 are both nominally RGBA (and DXT1 with the 1-bit alpha is
|
||||
also) yet one format must be chosen up front.
|
||||
|
||||
(3) Should TexSubImage support all block-aligned edits or just the minimal
|
||||
functionality required by the ARB_texture_compression extension?
|
||||
|
||||
RESOLVED: Allow all valid block-aligned edits.
|
||||
|
||||
(4) A pre-compressed image with a DXT1 format can be used as either an
|
||||
RGB_S3TC_DXT1 or an RGBA_S3TC_DXT1 image. If the image has
|
||||
transparent texels, how are they treated in each format?
|
||||
|
||||
RESOLVED: The renderer has to make sure that an RGB_S3TC_DXT1 format
|
||||
is decoded as RGB (where alpha is effectively one for all texels),
|
||||
while RGBA_S3TC_DXT1 is decoded as RGBA (where alpha is zero for all
|
||||
texels with "transparent" encodings). Otherwise, the formats are
|
||||
identical.
|
||||
|
||||
(5) Is the encoding of the RGB components for DXT1 formats correct in this
|
||||
spec? MSDN documentation does not specify an RGB color for the
|
||||
"transparent" encoding. Is it really black?
|
||||
|
||||
RESOLVED: Yes. The specification for the DXT1 format initially
|
||||
required black, but later changed that requirement to a
|
||||
recommendation. All vendors involved in the definition of this
|
||||
specification support black. In addition, specifying black has a
|
||||
useful behavior.
|
||||
|
||||
When blending multiple texels (GL_LINEAR filtering), mixing opaque and
|
||||
transparent samples is problematic. Defining a black color on
|
||||
transparent texels achieves a sensible result that works like a
|
||||
texture with premultiplied alpha. For example, if three opaque white
|
||||
and one transparent sample is being averaged, the result would be a
|
||||
75% intensity gray (with an alpha of 75%). This is the same result on
|
||||
the color channels as would be obtained using a white color, 75%
|
||||
alpha, and a SRC_ALPHA blend factor.
|
||||
|
||||
(6) Is the encoding of the RGB components for DXT3 and DXT5 formats
|
||||
correct in this spec? MSDN documentation suggests that the RGB blocks
|
||||
for DXT3 and DXT5 are decoded as described by the DXT1 format.
|
||||
|
||||
RESOLVED: Yes -- this appears to be a bug in the MSDN documentation.
|
||||
The specification for the DXT2-DXT5 formats require decoding using the
|
||||
opaque block encoding, regardless of the relative values of "color0"
|
||||
and "color1".
|
||||
|
||||
New Procedures and Functions
|
||||
|
||||
None.
|
||||
|
||||
New Tokens
|
||||
|
||||
Accepted by the <internalformat> parameter of TexImage2D, CopyTexImage2D,
|
||||
and CompressedTexImage2DARB and the <format> parameter of
|
||||
CompressedTexSubImage2DARB:
|
||||
|
||||
COMPRESSED_RGB_S3TC_DXT1_EXT 0x83F0
|
||||
COMPRESSED_RGBA_S3TC_DXT1_EXT 0x83F1
|
||||
COMPRESSED_RGBA_S3TC_DXT3_EXT 0x83F2
|
||||
COMPRESSED_RGBA_S3TC_DXT5_EXT 0x83F3
|
||||
|
||||
Additions to Chapter 2 of the OpenGL 1.2.1 Specification (OpenGL Operation)
|
||||
|
||||
None.
|
||||
|
||||
Additions to Chapter 3 of the OpenGL 1.2.1 Specification (Rasterization)
|
||||
|
||||
Add to Table 3.16.1: Specific Compressed Internal Formats
|
||||
|
||||
Compressed Internal Format Base Internal Format
|
||||
========================== ====================
|
||||
COMPRESSED_RGB_S3TC_DXT1_EXT RGB
|
||||
COMPRESSED_RGBA_S3TC_DXT1_EXT RGBA
|
||||
COMPRESSED_RGBA_S3TC_DXT3_EXT RGBA
|
||||
COMPRESSED_RGBA_S3TC_DXT5_EXT RGBA
|
||||
|
||||
|
||||
Modify Section 3.8.2, Alternate Image Specification
|
||||
|
||||
(add to end of TexSubImage discussion, p.123 -- after edit from the
|
||||
ARB_texture_compression spec)
|
||||
|
||||
If the internal format of the texture image being modified is
|
||||
COMPRESSED_RGB_S3TC_DXT1_EXT, COMPRESSED_RGBA_S3TC_DXT1_EXT,
|
||||
COMPRESSED_RGBA_S3TC_DXT3_EXT, or COMPRESSED_RGBA_S3TC_DXT5_EXT, the
|
||||
texture is stored using one of the several S3TC compressed texture image
|
||||
formats. Such images are easily edited along 4x4 texel boundaries, so the
|
||||
limitations on TexSubImage2D or CopyTexSubImage2D parameters are relaxed.
|
||||
TexSubImage2D and CopyTexSubImage2D will result in an INVALID_OPERATION
|
||||
error only if one of the following conditions occurs:
|
||||
|
||||
* <width> is not a multiple of four or equal to TEXTURE_WIDTH,
|
||||
unless <xoffset> and <yoffset> are both zero.
|
||||
* <height> is not a multiple of four or equal to TEXTURE_HEIGHT,
|
||||
unless <xoffset> and <yoffset> are both zero.
|
||||
* <xoffset> or <yoffset> is not a multiple of four.
|
||||
|
||||
The contents of any 4x4 block of texels of an S3TC compressed texture
|
||||
image that does not intersect the area being modified are preserved during
|
||||
valid TexSubImage2D and CopyTexSubImage2D calls.
|
||||
|
||||
|
||||
Add to Section 3.8.2, Alternate Image Specification (adding to the end of
|
||||
the CompressedTexImage section introduced by the ARB_texture_compression
|
||||
spec)
|
||||
|
||||
If <internalformat> is COMPRESSED_RGB_S3TC_DXT1_EXT,
|
||||
COMPRESSED_RGBA_S3TC_DXT1_EXT, COMPRESSED_RGBA_S3TC_DXT3_EXT, or
|
||||
COMPRESSED_RGBA_S3TC_DXT5_EXT, the compressed texture is stored using one
|
||||
of several S3TC compressed texture image formats. The S3TC texture
|
||||
compression algorithm supports only 2D images without borders.
|
||||
CompressedTexImage1DARB and CompressedTexImage3DARB produce an
|
||||
INVALID_ENUM error if <internalformat> is an S3TC format.
|
||||
CompressedTexImage2DARB will produce an INVALID_OPERATION error if
|
||||
<border> is non-zero.
|
||||
|
||||
|
||||
Add to Section 3.8.2, Alternate Image Specification (adding to the end of
|
||||
the CompressedTexSubImage section introduced by the
|
||||
ARB_texture_compression spec)
|
||||
|
||||
If the internal format of the texture image being modified is
|
||||
COMPRESSED_RGB_S3TC_DXT1_EXT, COMPRESSED_RGBA_S3TC_DXT1_EXT,
|
||||
COMPRESSED_RGBA_S3TC_DXT3_EXT, or COMPRESSED_RGBA_S3TC_DXT5_EXT, the
|
||||
texture is stored using one of the several S3TC compressed texture image
|
||||
formats. Since the S3TC texture compression algorithm supports only 2D
|
||||
images, CompressedTexSubImage1DARB and CompressedTexSubImage3DARB produce
|
||||
an INVALID_ENUM error if <format> is an S3TC format. Since S3TC images
|
||||
are easily edited along 4x4 texel boundaries, the limitations on
|
||||
CompressedTexSubImage2D are relaxed. CompressedTexSubImage2D will result
|
||||
in an INVALID_OPERATION error only if one of the following conditions
|
||||
occurs:
|
||||
|
||||
* <width> is not a multiple of four or equal to TEXTURE_WIDTH.
|
||||
* <height> is not a multiple of four or equal to TEXTURE_HEIGHT.
|
||||
* <xoffset> or <yoffset> is not a multiple of four.
|
||||
|
||||
The contents of any 4x4 block of texels of an S3TC compressed texture
|
||||
image that does not intersect the area being modified are preserved during
|
||||
valid TexSubImage2D and CopyTexSubImage2D calls.
|
||||
|
||||
Additions to Chapter 4 of the OpenGL 1.2.1 Specification (Per-Fragment
|
||||
Operations and the Frame Buffer)
|
||||
|
||||
None.
|
||||
|
||||
Additions to Chapter 5 of the OpenGL 1.2.1 Specification (Special Functions)
|
||||
|
||||
None.
|
||||
|
||||
Additions to Chapter 6 of the OpenGL 1.2.1 Specification (State and
|
||||
State Requests)
|
||||
|
||||
None.
|
||||
|
||||
Additions to Appendix A of the OpenGL 1.2.1 Specification (Invariance)
|
||||
|
||||
None.
|
||||
|
||||
Additions to the AGL/GLX/WGL Specifications
|
||||
|
||||
None.
|
||||
|
||||
GLX Protocol
|
||||
|
||||
None.
|
||||
|
||||
Errors
|
||||
|
||||
INVALID_ENUM is generated by CompressedTexImage1DARB or
|
||||
CompressedTexImage3DARB if <internalformat> is
|
||||
COMPRESSED_RGB_S3TC_DXT1_EXT, COMPRESSED_RGBA_S3TC_DXT1_EXT,
|
||||
COMPRESSED_RGBA_S3TC_DXT3_EXT, or COMPRESSED_RGBA_S3TC_DXT5_EXT.
|
||||
|
||||
INVALID_OPERATION is generated by CompressedTexImage2DARB if
|
||||
<internalformat> is COMPRESSED_RGB_S3TC_DXT1_EXT,
|
||||
COMPRESSED_RGBA_S3TC_DXT1_EXT, COMPRESSED_RGBA_S3TC_DXT3_EXT, or
|
||||
COMPRESSED_RGBA_S3TC_DXT5_EXT and <border> is not equal to zero.
|
||||
|
||||
INVALID_ENUM is generated by CompressedTexSubImage1DARB or
|
||||
CompressedTexSubImage3DARB if <format> is COMPRESSED_RGB_S3TC_DXT1_EXT,
|
||||
COMPRESSED_RGBA_S3TC_DXT1_EXT, COMPRESSED_RGBA_S3TC_DXT3_EXT, or
|
||||
COMPRESSED_RGBA_S3TC_DXT5_EXT.
|
||||
|
||||
INVALID_OPERATION is generated by TexSubImage2D CopyTexSubImage2D, or
|
||||
CompressedTexSubImage2D if TEXTURE_INTERNAL_FORMAT is
|
||||
COMPRESSED_RGB_S3TC_DXT1_EXT, COMPRESSED_RGBA_S3TC_DXT1_EXT,
|
||||
COMPRESSED_RGBA_S3TC_DXT3_EXT, or COMPRESSED_RGBA_S3TC_DXT5_EXT and any of
|
||||
the following apply: <width> is not a multiple of four or equal to
|
||||
TEXTURE_WIDTH; <height> is not a multiple of four or equal to
|
||||
TEXTURE_HEIGHT; <xoffset> or <yoffset> is not a multiple of four.
|
||||
|
||||
|
||||
The following restrictions from the ARB_texture_compression specification
|
||||
do not apply to S3TC texture formats, since subimage modification is
|
||||
straightforward as long as the subimage is properly aligned.
|
||||
|
||||
DELETE: INVALID_OPERATION is generated by TexSubImage1D, TexSubImage2D,
|
||||
DELETE: TexSubImage3D, CopyTexSubImage1D, CopyTexSubImage2D, or
|
||||
DELETE: CopyTexSubImage3D if the internal format of the texture image is
|
||||
DELETE: compressed and <xoffset>, <yoffset>, or <zoffset> does not equal
|
||||
DELETE: -b, where b is value of TEXTURE_BORDER.
|
||||
|
||||
DELETE: INVALID_VALUE is generated by CompressedTexSubImage1DARB,
|
||||
DELETE: CompressedTexSubImage2DARB, or CompressedTexSubImage3DARB if the
|
||||
DELETE: entire texture image is not being edited: if <xoffset>,
|
||||
DELETE: <yoffset>, or <zoffset> is greater than -b, <xoffset> + <width> is
|
||||
DELETE: less than w+b, <yoffset> + <height> is less than h+b, or <zoffset>
|
||||
DELETE: + <depth> is less than d+b, where b is the value of
|
||||
DELETE: TEXTURE_BORDER, w is the value of TEXTURE_WIDTH, h is the value of
|
||||
DELETE: TEXTURE_HEIGHT, and d is the value of TEXTURE_DEPTH.
|
||||
|
||||
See also errors in the GL_ARB_texture_compression specification.
|
||||
|
||||
New State
|
||||
|
||||
In the "Textures" state table, increment the TEXTURE_INTERNAL_FORMAT
|
||||
subscript for Z by 4 in the "Type" row.
|
||||
|
||||
New Implementation Dependent State
|
||||
|
||||
None
|
||||
|
||||
Appendix
|
||||
|
||||
S3TC Compressed Texture Image Formats
|
||||
|
||||
Compressed texture images stored using the S3TC compressed image formats
|
||||
are represented as a collection of 4x4 texel blocks, where each block
|
||||
contains 64 or 128 bits of texel data. The image is encoded as a normal
|
||||
2D raster image in which each 4x4 block is treated as a single pixel. If
|
||||
an S3TC image has a width or height less than four, the data corresponding
|
||||
to texels outside the image are irrelevant and undefined.
|
||||
|
||||
When an S3TC image with a width of <w>, height of <h>, and block size of
|
||||
<blocksize> (8 or 16 bytes) is decoded, the corresponding image size (in
|
||||
bytes) is:
|
||||
|
||||
ceil(<w>/4) * ceil(<h>/4) * blocksize.
|
||||
|
||||
When decoding an S3TC image, the block containing the texel at offset
|
||||
(<x>, <y>) begins at an offset (in bytes) relative to the base of the
|
||||
image of:
|
||||
|
||||
blocksize * (ceil(<w>/4) * floor(<y>/4) + floor(<x>/4)).
|
||||
|
||||
The data corresponding to a specific texel (<x>, <y>) are extracted from a
|
||||
4x4 texel block using a relative (x,y) value of
|
||||
|
||||
(<x> modulo 4, <y> modulo 4).
|
||||
|
||||
There are four distinct S3TC image formats:
|
||||
|
||||
COMPRESSED_RGB_S3TC_DXT1_EXT: Each 4x4 block of texels consists of 64
|
||||
bits of RGB image data.
|
||||
|
||||
Each RGB image data block is encoded as a sequence of 8 bytes, called (in
|
||||
order of increasing address):
|
||||
|
||||
c0_lo, c0_hi, c1_lo, c1_hi, bits_0, bits_1, bits_2, bits_3
|
||||
|
||||
The 8 bytes of the block are decoded into three quantities:
|
||||
|
||||
color0 = c0_lo + c0_hi * 256
|
||||
color1 = c1_lo + c1_hi * 256
|
||||
bits = bits_0 + 256 * (bits_1 + 256 * (bits_2 + 256 * bits_3))
|
||||
|
||||
color0 and color1 are 16-bit unsigned integers that are unpacked to
|
||||
RGB colors RGB0 and RGB1 as though they were 16-bit packed pixels with
|
||||
a <format> of RGB and a type of UNSIGNED_SHORT_5_6_5.
|
||||
|
||||
bits is a 32-bit unsigned integer, from which a two-bit control code
|
||||
is extracted for a texel at location (x,y) in the block using:
|
||||
|
||||
code(x,y) = bits[2*(4*y+x)+1..2*(4*y+x)+0]
|
||||
|
||||
where bit 31 is the most significant and bit 0 is the least
|
||||
significant bit.
|
||||
|
||||
The RGB color for a texel at location (x,y) in the block is given by:
|
||||
|
||||
RGB0, if color0 > color1 and code(x,y) == 0
|
||||
RGB1, if color0 > color1 and code(x,y) == 1
|
||||
(2*RGB0+RGB1)/3, if color0 > color1 and code(x,y) == 2
|
||||
(RGB0+2*RGB1)/3, if color0 > color1 and code(x,y) == 3
|
||||
|
||||
RGB0, if color0 <= color1 and code(x,y) == 0
|
||||
RGB1, if color0 <= color1 and code(x,y) == 1
|
||||
(RGB0+RGB1)/2, if color0 <= color1 and code(x,y) == 2
|
||||
BLACK, if color0 <= color1 and code(x,y) == 3
|
||||
|
||||
Arithmetic operations are done per component, and BLACK refers to an
|
||||
RGB color where red, green, and blue are all zero.
|
||||
|
||||
Since this image has an RGB format, there is no alpha component and the
|
||||
image is considered fully opaque.
|
||||
|
||||
|
||||
COMPRESSED_RGBA_S3TC_DXT1_EXT: Each 4x4 block of texels consists of 64
|
||||
bits of RGB image data and minimal alpha information. The RGB components
|
||||
of a texel are extracted in the same way as COMPRESSED_RGB_S3TC_DXT1_EXT.
|
||||
|
||||
The alpha component for a texel at location (x,y) in the block is
|
||||
given by:
|
||||
|
||||
0.0, if color0 <= color1 and code(x,y) == 3
|
||||
1.0, otherwise
|
||||
|
||||
IMPORTANT: When encoding an RGBA image into a format using 1-bit
|
||||
alpha, any texels with an alpha component less than 0.5 end up with an
|
||||
alpha of 0.0 and any texels with an alpha component greater than or
|
||||
equal to 0.5 end up with an alpha of 1.0. When encoding an RGBA image
|
||||
into the COMPRESSED_RGBA_S3TC_DXT1_EXT format, the resulting red,
|
||||
green, and blue components of any texels with a final alpha of 0.0
|
||||
will automatically be zero (black). If this behavior is not desired
|
||||
by an application, it should not use COMPRESSED_RGBA_S3TC_DXT1_EXT.
|
||||
This format will never be used when a generic compressed internal
|
||||
format (Table 3.16.2) is specified, although the nearly identical
|
||||
format COMPRESSED_RGB_S3TC_DXT1_EXT (above) may be.
|
||||
|
||||
|
||||
COMPRESSED_RGBA_S3TC_DXT3_EXT: Each 4x4 block of texels consists of 64
|
||||
bits of uncompressed alpha image data followed by 64 bits of RGB image
|
||||
data.
|
||||
|
||||
Each RGB image data block is encoded according to the
|
||||
COMPRESSED_RGB_S3TC_DXT1_EXT format, with the exception that the two code
|
||||
bits always use the non-transparent encodings. In other words, they are
|
||||
treated as though color0 > color1, regardless of the actual values of
|
||||
color0 and color1.
|
||||
|
||||
Each alpha image data block is encoded as a sequence of 8 bytes, called
|
||||
(in order of increasing address):
|
||||
|
||||
a0, a1, a2, a3, a4, a5, a6, a7
|
||||
|
||||
The 8 bytes of the block are decoded into one 64-bit integer:
|
||||
|
||||
alpha = a0 + 256 * (a1 + 256 * (a2 + 256 * (a3 + 256 * (a4 +
|
||||
256 * (a5 + 256 * (a6 + 256 * a7))))))
|
||||
|
||||
alpha is a 64-bit unsigned integer, from which a four-bit alpha value
|
||||
is extracted for a texel at location (x,y) in the block using:
|
||||
|
||||
alpha(x,y) = bits[4*(4*y+x)+3..4*(4*y+x)+0]
|
||||
|
||||
where bit 63 is the most significant and bit 0 is the least
|
||||
significant bit.
|
||||
|
||||
The alpha component for a texel at location (x,y) in the block is
|
||||
given by alpha(x,y) / 15.
|
||||
|
||||
|
||||
COMPRESSED_RGBA_S3TC_DXT5_EXT: Each 4x4 block of texels consists of 64
|
||||
bits of compressed alpha image data followed by 64 bits of RGB image data.
|
||||
|
||||
Each RGB image data block is encoded according to the
|
||||
COMPRESSED_RGB_S3TC_DXT1_EXT format, with the exception that the two code
|
||||
bits always use the non-transparent encodings. In other words, they are
|
||||
treated as though color0 > color1, regardless of the actual values of
|
||||
color0 and color1.
|
||||
|
||||
Each alpha image data block is encoded as a sequence of 8 bytes, called
|
||||
(in order of increasing address):
|
||||
|
||||
alpha0, alpha1, bits_0, bits_1, bits_2, bits_3, bits_4, bits_5
|
||||
|
||||
The alpha0 and alpha1 are 8-bit unsigned bytes converted to alpha
|
||||
components by multiplying by 1/255.
|
||||
|
||||
The 6 "bits" bytes of the block are decoded into one 48-bit integer:
|
||||
|
||||
bits = bits_0 + 256 * (bits_1 + 256 * (bits_2 + 256 * (bits_3 +
|
||||
256 * (bits_4 + 256 * bits_5))))
|
||||
|
||||
bits is a 48-bit unsigned integer, from which a three-bit control code
|
||||
is extracted for a texel at location (x,y) in the block using:
|
||||
|
||||
code(x,y) = bits[3*(4*y+x)+1..3*(4*y+x)+0]
|
||||
|
||||
where bit 47 is the most significant and bit 0 is the least
|
||||
significant bit.
|
||||
|
||||
The alpha component for a texel at location (x,y) in the block is
|
||||
given by:
|
||||
|
||||
alpha0, code(x,y) == 0
|
||||
alpha1, code(x,y) == 1
|
||||
|
||||
(6*alpha0 + 1*alpha1)/7, alpha0 > alpha1 and code(x,y) == 2
|
||||
(5*alpha0 + 2*alpha1)/7, alpha0 > alpha1 and code(x,y) == 3
|
||||
(4*alpha0 + 3*alpha1)/7, alpha0 > alpha1 and code(x,y) == 4
|
||||
(3*alpha0 + 4*alpha1)/7, alpha0 > alpha1 and code(x,y) == 5
|
||||
(2*alpha0 + 5*alpha1)/7, alpha0 > alpha1 and code(x,y) == 6
|
||||
(1*alpha0 + 6*alpha1)/7, alpha0 > alpha1 and code(x,y) == 7
|
||||
|
||||
(4*alpha0 + 1*alpha1)/5, alpha0 <= alpha1 and code(x,y) == 2
|
||||
(3*alpha0 + 2*alpha1)/5, alpha0 <= alpha1 and code(x,y) == 3
|
||||
(2*alpha0 + 3*alpha1)/5, alpha0 <= alpha1 and code(x,y) == 4
|
||||
(1*alpha0 + 4*alpha1)/5, alpha0 <= alpha1 and code(x,y) == 5
|
||||
0.0, alpha0 <= alpha1 and code(x,y) == 6
|
||||
1.0, alpha0 <= alpha1 and code(x,y) == 7
|
||||
|
||||
|
||||
Revision History
|
||||
|
||||
1.1, 11/16/01 pbrown: Updated contact info, clarified where texels
|
||||
fall within a single block.
|
||||
|
||||
1.0, 07/07/00 prbrown1: Published final version agreed to by working
|
||||
group members.
|
||||
|
||||
0.9, 06/24/00 prbrown1: Documented that block-aligned TexSubImage calls
|
||||
do not modify existing texels outside the
|
||||
modified blocks. Added caveat to allow for a
|
||||
(0,0)-anchored TexSubImage operation of
|
||||
arbitrary size.
|
||||
|
||||
0.7, 04/11/00 prbrown1: Added issues on DXT1, DXT3, and DXT5 encodings
|
||||
where the MSDN documentation doesn't match what
|
||||
is really done. Added enum values from the
|
||||
extension registry.
|
||||
|
||||
0.4, 03/28/00 prbrown1: Updated to reflect final version of the
|
||||
ARB_texture_compression extension. Allowed
|
||||
block-aligned TexSubImage calls.
|
||||
|
||||
0.3, 03/07/00 prbrown1: Resolved issues pertaining to the format of RGB
|
||||
blocks in the DXT3 and DXT5 formats (they don't
|
||||
ever use the "transparent" encoding). Fixed
|
||||
decoding of DXT1 blocks. Pointed out issue of
|
||||
"transparent" texels in DXT1 encodings having
|
||||
different behaviors for RGB and RGBA internal
|
||||
formats.
|
||||
|
||||
0.2, 02/23/00 prbrown1: Minor revisions; added several issues.
|
||||
|
||||
0.11, 02/17/00 prbrown1: Slight modification to error semantics
|
||||
(INVALID_ENUM instead of INVALID_OPERATION).
|
||||
|
||||
0.1, 02/15/00 prbrown1: Initial revision.
|
||||
@ -1,39 +0,0 @@
|
||||
Microsoft Visual Studio Solution File, Format Version 8.00
|
||||
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "squish", "squish\squish.vcproj", "{6A8518C3-D81A-4428-BD7F-C37933088AC1}"
|
||||
ProjectSection(ProjectDependencies) = postProject
|
||||
EndProjectSection
|
||||
EndProject
|
||||
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "squishpng", "squishpng\squishpng.vcproj", "{3BC7CF47-F1C8-4BDA-BE30-92F17B21D2C7}"
|
||||
ProjectSection(ProjectDependencies) = postProject
|
||||
{6A8518C3-D81A-4428-BD7F-C37933088AC1} = {6A8518C3-D81A-4428-BD7F-C37933088AC1}
|
||||
EndProjectSection
|
||||
EndProject
|
||||
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "squishtest", "squishtest\squishtest.vcproj", "{77A3F26C-A1D6-4535-9E37-7D3DF34E4B4B}"
|
||||
ProjectSection(ProjectDependencies) = postProject
|
||||
{6A8518C3-D81A-4428-BD7F-C37933088AC1} = {6A8518C3-D81A-4428-BD7F-C37933088AC1}
|
||||
EndProjectSection
|
||||
EndProject
|
||||
Global
|
||||
GlobalSection(SolutionConfiguration) = preSolution
|
||||
Debug = Debug
|
||||
Release = Release
|
||||
EndGlobalSection
|
||||
GlobalSection(ProjectConfiguration) = postSolution
|
||||
{6A8518C3-D81A-4428-BD7F-C37933088AC1}.Debug.ActiveCfg = Debug|Win32
|
||||
{6A8518C3-D81A-4428-BD7F-C37933088AC1}.Debug.Build.0 = Debug|Win32
|
||||
{6A8518C3-D81A-4428-BD7F-C37933088AC1}.Release.ActiveCfg = Release|Win32
|
||||
{6A8518C3-D81A-4428-BD7F-C37933088AC1}.Release.Build.0 = Release|Win32
|
||||
{3BC7CF47-F1C8-4BDA-BE30-92F17B21D2C7}.Debug.ActiveCfg = Debug|Win32
|
||||
{3BC7CF47-F1C8-4BDA-BE30-92F17B21D2C7}.Debug.Build.0 = Debug|Win32
|
||||
{3BC7CF47-F1C8-4BDA-BE30-92F17B21D2C7}.Release.ActiveCfg = Release|Win32
|
||||
{3BC7CF47-F1C8-4BDA-BE30-92F17B21D2C7}.Release.Build.0 = Release|Win32
|
||||
{77A3F26C-A1D6-4535-9E37-7D3DF34E4B4B}.Debug.ActiveCfg = Debug|Win32
|
||||
{77A3F26C-A1D6-4535-9E37-7D3DF34E4B4B}.Debug.Build.0 = Debug|Win32
|
||||
{77A3F26C-A1D6-4535-9E37-7D3DF34E4B4B}.Release.ActiveCfg = Release|Win32
|
||||
{77A3F26C-A1D6-4535-9E37-7D3DF34E4B4B}.Release.Build.0 = Release|Win32
|
||||
EndGlobalSection
|
||||
GlobalSection(ExtensibilityGlobals) = postSolution
|
||||
EndGlobalSection
|
||||
GlobalSection(ExtensibilityAddIns) = postSolution
|
||||
EndGlobalSection
|
||||
EndGlobal
|
||||
@ -1,198 +0,0 @@
|
||||
<?xml version="1.0" encoding="Windows-1252"?>
|
||||
<VisualStudioProject
|
||||
ProjectType="Visual C++"
|
||||
Version="7.10"
|
||||
Name="squish"
|
||||
ProjectGUID="{6A8518C3-D81A-4428-BD7F-C37933088AC1}"
|
||||
Keyword="Win32Proj">
|
||||
<Platforms>
|
||||
<Platform
|
||||
Name="Win32"/>
|
||||
</Platforms>
|
||||
<Configurations>
|
||||
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@ -1,138 +0,0 @@
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|
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|
||||
Loading…
Reference in New Issue
Block a user