KhronosGroup / KhronosGroup/OpenGL-Registry

EXT_texture_sRGB_decode assumes S3TC sRGB formats introduces in EXT_texture_compression_s3tc

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#341 7 comments 0 reactions 1 assignee Claimed by @hanfling View on GitHub
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Description

EXT_texture_compression_s3tc only introduces the non sRGB S3TC formats, where as the EXT_texture_sRGB extension actually introduces the COMPRESSED_SRGB_S3TC_DXT1_EXT, COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT, COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT, and COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT formats.

Now inside EXT_texture_sRGB_decode spec:

Dependencies on EXT_texture_compression_s3tc

If EXT_texture_compression_s3tc is NOT supported, delete
COMPRESSED_SRGB_S3TC_DXT1_EXT, COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT,
COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT, and
COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT from Section 3.8.15.

If I understand this correctly, this needs to be:

If EXT_texture_compression_s3tc or EXT_texture_sRGB is NOT supported...

Apple implementation seems to expose EXT_texture_sRGB_decode and EXT_texture_compression_s3tc, but not EXT_texture_sRGB.

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