Import Cobalt 10.58719
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+Name
+
+ ANGLE_lossy_etc_decode
+
+Name Strings
+
+ GL_ANGLE_lossy_etc_decode
+
+Contributors
+
+ Minmin Gong (mgong 'at' microsoft.com)
+
+Contacts
+
+ Minmin Gong (mgong 'at' microsoft.com)
+
+Status
+
+ Draft
+
+Version
+
+ Last Modified Date: Nov 25, 2015
+ Author Revision: 1
+
+Number
+
+ TBD
+
+Dependencies
+
+ Requires OpenGL ES 3.0 for ETC2 and EAC formats, or OpenGL ES 2.0 and
+ OES_compressed_ETC1_RGB8_texture for ETC1 format.
+ The extension is written against the OpenGL ES 2.0 specification.
+
+Overview
+
+ Both the OpenGL ES 3.0 specification and OES_compressed_ETC1_RGB8_texture
+ specify that Ericsson Texture Compression (ETC) decoding must not be lossy.
+ The goal of this extension is to allow a lossy decode of
+ compressed textures in the ETC formats in OpenGL ES, for lower memory
+ and bandwidth consumption.
+
+ This extension uses the same ETC compression format as OpenGL ES 3.0
+ and OES_compressed_ETC1_RGB8_texture, with the restriction that the texture
+ dimensions must be a multiple of four (except for mip levels where the
+ dimensions are either 2 or 1). And the requirement that ETC decoding must
+ not be lossy is relaxed.
+
+ See OES_compressed_ETC1_RGB8_texture for a description of the ETC1 format.
+ Also see OpenGL ES 3.0 specification appendix C.2 (ETC Compressed Texture
+ ImageFormats) for a description of ETC2 and EAC formats.
+
+IP Status
+
+ See Ericsson's "IP Statement"
+
+New Procedures and Functions
+
+ None.
+
+New Types
+
+ None.
+
+New Tokens
+
+ Accepted by the <internalformat> parameter of CompressedTexImage2D
+ and the <format> parameter of CompressedTexSubImage2D:
+
+ ETC1_RGB8_LOSSY_DECODE_ANGLE 0x9690
+ COMPRESSED_R11_LOSSY_DECODE_EAC_ANGLE 0x9691
+ COMPRESSED_SIGNED_R11_LOSSY_DECODE_EAC_ANGLE 0x9692
+ COMPRESSED_RG11_LOSSY_DECODE_EAC_ANGLE 0x9693
+ COMPRESSED_SIGNED_RG11_LOSSY_DECODE_EAC_ANGLE 0x9694
+ COMPRESSED_RGB8_LOSSY_DECODE_ETC2_ANGLE 0x9695
+ COMPRESSED_SRGB8_LOSSY_DECODE_ETC2_ANGLE 0x9696
+ COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_LOSSY_DECODE_ETC2_ANGLE 0x9697
+ COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_LOSSY_DECODE_ETC2_ANGLE 0x9698
+ COMPRESSED_RGBA8_LOSSY_DECODE_ETC2_EAC_ANGLE 0x9699
+ COMPRESSED_SRGB8_ALPHA8_LOSSY_DECODE_ETC2_EAC_ANGLE 0x969A
+
+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
+ ========================== ====================
+ ETC1_RGB8_LOSSY_DECODE_ANGLE RGB
+ COMPRESSED_R11_LOSSY_DECODE_EAC_ANGLE R
+ COMPRESSED_SIGNED_R11_LOSSY_DECODE_EAC_ANGLE R
+ COMPRESSED_RG11_LOSSY_DECODE_EAC_ANGLE RG
+ COMPRESSED_SIGNED_RG11_LOSSY_DECODE_EAC_ANGLE RG
+ COMPRESSED_RGB8_LOSSY_DECODE_ETC2_ANGLE RGB
+ COMPRESSED_SRGB8_LOSSY_DECODE_ETC2_ANGLE RGB
+ COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_LOSSY_DECODE_ETC2_ANGLE RGBA
+ COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_LOSSY_DECODE_ETC2_ANGLE RGBA
+ COMPRESSED_RGBA8_LOSSY_DECODE_ETC2_EAC_ANGLE RGBA
+ COMPRESSED_SRGB8_ALPHA8_LOSSY_DECODE_ETC2_EAC_ANGLE RGBA
+
+ Table 3.x: Specific Compressed Internal Formats
+
+ If <internalformat> is one of the ETC lossy decode formats listed in
+ Table 3.x, the compressed texture is stored in an unspecified compressed
+ texture format, that may introduce losses of precision in the texture data.
+ The GL and the ETC texture compression algorithm support only 2D images
+ without borders.
+
+ CompressedTexImage2D will produce the INVALID_OPERATION error when
+ <internalformat> is one of the lossy decode ETC-format values from
+ Table 3.x under the following conditions:
+
+ * <border> is non-zero.
+ * <width> is not one, two, nor a multiple of four.
+ * <height> is not one, two, nor 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 an ETC-format
+ listed in Table 3.x, the compressed texture is stored in an unspecified
+ compressed texture format. The xoffset and yoffset must also be aligned to
+ 4x4 texel block boundaries, since ETC encoding makes it difficult to modify
+ non-aligned regions. CompressedTexSubImage2D will result in an
+ INVALID_OPERATION error only if one of the following conditions occurs:
+
+ * <width> is not a multiple of four nor equal to TEXTURE_WIDTH.
+ * <height> is not a multiple of four nor 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.
+
+Errors
+
+ INVALID_OPERATION is generated by CompressedTexImage2D if
+ lossy decode ETC-format is used and <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, nor a multiple of four.
+ - <height> is not one, two, nor a multiple of four.
+
+ INVALID_OPERATION is generated by CompressedTexSubImage2D if
+ lossy decode ETC-format is used and <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 nor equal to TEXTURE_WIDTH;
+ - <height> is not a multiple of four nor 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.
+
+Revision History
+
+ Revision 1, 2015/11/25 - mgong
+ - Initial revision
