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ETC1 and other TC format support in DDS plugin


 
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psi29a
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Joined: 12 Aug 2015
Posts: 2
Location: Belgium

PostPosted: Wed Aug 12, 2015 9:56 am    Post subject:
ETC1 and other TC format support in DDS plugin
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Hello, I'm currently a developer for the OpenMW[1] project. One the sub-projects I'm heading up there is a openmw-template, which has just enough assets to be usable by OpenMW and allow others to build upon it.

Upon testing on the RPi2 (Raspberry Pi 2), I noticed that the that the GL_EXT_texture_compression_s3tc is not supported by the VC4 hardware that Eric Anholt[2] is working to support via the VC4 DRM driver[3].

The VC4 does however support the GL_OES_compressed_ETC1_RGB8_texture extension which is guaranteed to be in OpenGL 4.3 anyway.

Is there any way that the DDS plugin can incorporate ETC1?

Attachment is a screenshot of OpenMW running Morrowind on the RPi2. Smile
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Alberto Luaces
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PostPosted: Wed Aug 19, 2015 9:35 pm    Post subject:
ETC1 and other TC format support in DDS plugin
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"bret curtis" writes:

Quote:
Is there any way that the DDS plugin can incorporate ETC1?


If a patch that activates ETC1 as that plugin's options is submitted, I
guess there will be any problem. Unfortunately, I don't own a RPi2 to
try; maybe others can.

Quote:

Attachment is a screenshot of OpenMW running Morrowind on the RPi2. Smile

Cool!

--
Alberto



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psi29a
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Joined: 12 Aug 2015
Posts: 2
Location: Belgium

PostPosted: Thu Aug 27, 2015 3:31 pm    Post subject:
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Here is the good news, ETC1 is supported by NVIDIA's binary blob on Linux even though it isn't announced. So it can be tested. I validated this by loading a KTX file (instead of a DDS) file, so the code to handle ETC1 is available but only in the KTX plugin.

VC4 (in RPi) announces support, but it isn't live yet. Eric Anholt confirmed this when I talked to him last week. It is coming.

Intel announces support, but OSG gives a message that the opengl function isn't supported. So I don't know if this is problem with Intel's driver or in OSG itself.


BTW: Here is a shot of OpenMW (using OSG) running with uncompressed textures on the RPi2.
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