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author | daniel@transgaming.com <daniel@transgaming.com@736b8ea6-26fd-11df-bfd4-992fa37f6226> | 2013-02-01 06:37:10 +0000 |
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committer | daniel@transgaming.com <daniel@transgaming.com@736b8ea6-26fd-11df-bfd4-992fa37f6226> | 2013-02-01 06:37:10 +0000 |
commit | 58ae0f6fe2a7b77636e6cd4eb9a9c7e15a93df5d (patch) | |
tree | c070f168aa545b99fc68dd3607e86b9cc6de2208 /extensions | |
parent | 9bb0bacef2826fb48e4f1ac69b87ee1fdad6a9d3 (diff) | |
download | angle-58ae0f6fe2a7b77636e6cd4eb9a9c7e15a93df5d.tar.gz |
Update ANGLE_texture_compression_dxt
git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1822 736b8ea6-26fd-11df-bfd4-992fa37f6226
Diffstat (limited to 'extensions')
-rw-r--r-- | extensions/ANGLE_texture_compression_dxt.txt | 102 |
1 files changed, 96 insertions, 6 deletions
diff --git a/extensions/ANGLE_texture_compression_dxt.txt b/extensions/ANGLE_texture_compression_dxt.txt index d1557300..0e844bfe 100644 --- a/extensions/ANGLE_texture_compression_dxt.txt +++ b/extensions/ANGLE_texture_compression_dxt.txt @@ -4,6 +4,7 @@ Name Name Strings + GL_ANGLE_texture_compression_dxt1 GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 @@ -23,27 +24,36 @@ Status Version - Last Modified Date: Aug 2, 2011 + Last Modified Date: Sept 22, 2012 + Author Revision: 2 Number - OpenGL ES Extension #.. + OpenGL ES Extension #111 Dependencies - Requires OpenGL ES 2.0. + Requires OpenGL ES 1.0. The extension is written against the OpenGL ES 2.0 specification. Overview These extensions are exactly the same as EXT_texture_compression_dxt1 - except they expose the formats COMPRESSED_RGBA_S3TC_DXT3_ANGLE and - COMPRESSED_RGBA_S3TC_DXT5_ANGLE respectively. + except they additionally expose the COMPRESSED_RGBA_S3TC_DXT3_ANGLE and + COMPRESSED_RGBA_S3TC_DXT5_ANGLE formats and have a size restrictions + such that the size must be a multiple of four (except for mip levels + where the dimensions are either 2 or 1). See EXT_texture_compression_dxt1 for the full list of changes. Also see EXT_texture_compression_s3tc for a description of the formats. +IP Status + + A license to the S3TC Intellectual Property may be necessary for + implementation of this extension. You should consult with your + Attorney to determine the need for a license. + New Procedures and Functions None. @@ -57,17 +67,97 @@ New Tokens Accepted by the <internalformat> parameter of CompressedTexImage2D and the <format> parameter of CompressedTexSubImage2D: + COMPRESSED_RGB_S3TC_DXT1_ANGLE 0x83F0 + COMPRESSED_RGBA_S3TC_DXT1_ANGLE 0x83F1 COMPRESSED_RGBA_S3TC_DXT3_ANGLE 0x83F2 COMPRESSED_RGBA_S3TC_DXT5_ANGLE 0x83F3 +Additions to Chapter 3 of the OpenGL ES 2.0 Specification (Rasterization) + + Add the following to Section 3.7.3 (Compressed Texture Images) + (at the end of the description of the CompressedTexImage2D command): + + Compressed Internal Format Base Internal Format + ========================== ==================== + COMPRESSED_RGB_S3TC_DXT1_ANGLE RGB + COMPRESSED_RGBA_S3TC_DXT1_ANGLE RGBA + COMPRESSED_RGBA_S3TC_DXT3_ANGLE RGBA + COMPRESSED_RGBA_S3TC_DXT5_ANGLE RGBA + + Table 3.x: Specific Compressed Internal Formats + + If <internalformat> is one of the S3TC formats listed in Table 3.x, + the compressed texture is stored in the appropriate S3TC compressed + texture format (see Appendix). The GL and the S3TC texture compression + algorithm support only 2D images without borders. + + CompressedTexImage2D will produce the INVALID_OPERATION error when + <internalformat> is one of the values from Table 3.x under the following + conditions: + + * <border> is non-zero. + * <width> is not one, two, or a multiple of four. + * <height> is not one, two, or a multiple of four. + + Add the following to Section 3.7.3 (Compressed Texture Images) + (at the end of the description of the CompressedTexSubImage2D command): + + If the internal format of the texture image being modified is listed + in Table 3.x, the texture is stored in the appropriate S3TC compressed + texture format (see Appendix). Since DXT/S3TC images are easily edited + along 4x4 texel boundaries, the limitations of 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 multipls of four or equal to TEXTURE_HEIGHT. + * <xoffset> or <yoffset> is not a multiple of four. + * <format> does not match the internal format of the texture image + being modified. + + The following restrictions at the end of section 3.7.3 do not apply + to S3TC DXT texture formats, since subimage modification is straightforward + as long as the subimage is properly aligned. + Errors - None. + INVALID_OPERATION is generated by CompressedTexImage2D if <internalformat> + is one of the compressed internal formats from Table 3.x and any of the + following apply: + - <border> is not equal to zero. + - <width> is not one, two, or a multiple of four. + - <height> is not one, two, or a multiple of four. + + INVALID_OPERATION is generated by TexImage2D and CopyTexImage2D if + <internalformat> is one of the compressed internal formats from + Table 3.x. + + INVALID_OPERATION is generated by TexSubImage2D and CopyTexSubImage2D + if the internal format of the texture currently bound to <target> is + one of the compressed internal formats from Table 3.x. + + INVALID_OPERATION is generated by CompressedTexSubImage2D if <format> + is one of the compressed interal formats from Table 3.x 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; + - <format> does not match the internal format of the texture image + being modified. New State None. +Appendix: + + The format for the S3TC Compressed Texture Images Formats is documented + in the appendix of EXT_texture_compression_s3tc. + Revision History + Revision 1, 2010/08/06 - gman + - Initial revision + Revision 2, 2012/09/22 - dgkoch + - Added DXT1 formats and documented multiple of 4 restriction. |