On Thu, Oct 18, 2018 at 2:26 PM Erik Faye-Lund
<[email protected]> wrote:
> On Oct 18, 2018 18:21, Ilia Mirkin <[email protected]> wrote:
>
> Have you verified that this works OK on GLES2? This extension enables
> online compression, which isn't normally available in GLES, and I
> wouldn't be surprised if the current mesa TexImage handlers prevent
> it.
>
> The way I read the extension spec, it doesn't enable online compression on
> gles2. And from testing, it seems like mesa does the right thing. I'll double
> check, though...
"""
In extended OpenGL ES 2.0.25 these new tokens are accepted by the
<internalformat> parameter of TexImage2D, CompressedTexImage2D and
the <format>
parameter of CompressedTexSubImage2D.
"""
and in the ES 2 section of the modifications:
"""
Modify Section 3.7.2, Alternate Texture Image Specification Commands
(add to the end of section)
When the internal format of the texture object is
COMPRESSED_RGB_S3TC_DXT1_EXT, COMPRESSED_RGBA_S3TC_DXT1_EXT,
COMPRESSED_RGBA_S3TC_DXT3_EXT, or COMPRESSED_RGBA_S3TC_DXT5_EXT, the
update region specified in TexSubImage2D must be aligned to 4x4
pixel blocks. If <xoffset> or <yoffset> are not multiples of 4 an
INVALID_OPERATION error is generated. If <width> is not a multiple
of 4 and <xoffset> + <width> is not equal to the width of the LOD
then an INVALID_OPERATION error is generated. If <height> is not
a multiple of 4 and <yoffset> + <height> is not equal to the
height of the LOD then an INVALID_OPERATION error is generated.
"""
Since you can pass the compressed internal format to TexImage2D, that
implies online compression.
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