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  1. Must VkFormat extensions be enabled before use?

    I need to understand if it is the intention that extensions which add values to VkFormat have to be enabled before those formats can possibly be used.

    I have found 2 extensions that add to...
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    It's an oversight due mainly to not having any...

    It's an oversight due mainly to not having any ES2 load tests. If you make a copy of the es1 target in lib/libktx.gypi, s/.es1/.es2/, s/ES1/ES2/ and regenerate the projects (make xcode or msvs or...
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    Okay. Maybe I understand the second case. Is...

    Okay. Maybe I understand the second case. Is rowPitch the number of bytes until the next row of blocks not texels? BC2 has 4 x 4 blocks so 64 to a row and the blocks are 128 bit or 16 bytes. 64 * 16...
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    Weird scenes inside VkSubresourceLayout

    I am seeing weird results in VkSubresourceLayout in 2 cases. In both cases the implementation (Ubuntu 18.04 with Intel open-source driver) reports that the features I want to use are supported in...
  5. Major changes coming to incoming branch of KhronosGroup/KTX-Software

    I have recently completed major work in the KTX software (libktx and toktx):

    libktx

    Added a new “ktxTexture” object based API that makes it easy to read, write and modify KTX files when not...
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    You can use Imagination's PVRTexTool. See the...

    You can use Imagination's PVRTexTool. See the answer to your issue at https://github.com/KhronosGroup/KTX/issues/36 for more details.
  7. Does Intel support Vulkan on the Iris Pro Graphics 5200 on Windows?

    The driver page indirectly linked from the khronosdotorg community pages,
    ...
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    I think your validation is correct and that I...

    I think your validation is correct and that I made a mistake allowing toktx to write unsized internal formats. I plan to remove that feature and the support in libktx for loading such files. Is...
  9. There is not enough information here to tell if...

    There is not enough information here to tell if the PNG has an alpha channel or not. You'll need to use `identify -verbose`.

    Are you sure you exported the alpha channel? I haven't used gimp but...
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    Are you running on Windows? It looks like it but...

    Are you running on Windows? It looks like it but I please confirm.

    If you build the library for OpenGL ES 1 (KTX_OPENGL_ES1 = 1) you need to have an emulator installed on Windows. The...
  11. The changes on 'incoming' are now completed and...

    The changes on 'incoming' are now completed and the tests can be built and run on GNU/Linux, iOS, OS X and Windows. I plan to merge these to master on February 15th. At some point I will add Android...
  12. The new incoming branch is finally on GitHub. As...

    The new incoming branch is finally on GitHub. As noted, you'll need GitLFS to clone or fork this repo. README.md has a link. Note only the OS X and iOS builds are currently known to work. I'll be...
  13. Heads up on major change to loadtest apps and build system

    I am working on changes to make the loadtest applications portable. *_loadtests will be refactored to use SDL and project and make files will be generated with GYP. I was reluctant to add these...
  14. The SPIR-V specification does not describe a file...

    The SPIR-V specification does not describe a file format. It describes a binary form in memory and that form is a stream of words. Endianness only comes in to play if the stream of words has been...
  15. Because it is very low level and leaves...

    Because it is very low level and leaves management of pretty much everything up to the application, Vulkan is not for beginners. Beginners are probably better off using the AZDO subset of OpenGL...
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    I am delighted to hear you are implementing a...

    I am delighted to hear you are implementing a loader/write for jMonkeyEngine. Thank you for your efforts.

    Color space is indicated by the internalFormat specified in the KTX file. For sRGB images,...
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    This has nothing to do with endianness. The spec...

    This has nothing to do with endianness. The spec says that the elements of a group (e.g. RGBA) are fetched one at a time from memory and it specifies the order in which they are fetched. It is indeed...
  18. It is impossible to say from the data provided....

    It is impossible to say from the data provided. It is necessary to know which version of OpenGL ES you are using and to see the code that creates the texture and the code that attaches the texture to...
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    There are 2 strange things. First you are setting...

    There are 2 strange things. First you are setting the attrib pointer for m_distLocation to read from 0. Second an unknown variable "et" is being passed as the mode parameter of glDrawArrays. The...
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    I don't know of any diagram but the spec and man...

    I don't know of any diagram but the spec and man pages explicitly call out errors when the dependencies are not met. For the example you cite, the man page for glAttachShader says that...
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    All you need to compile OpenGL ES applications...

    All you need to compile OpenGL ES applications are the headers which can be downloaded from http://www.khronos.org/registry/gles/.

    To link the application you will need the SDK(s) for the...
  22. What memory are you measuring and how are you...

    What memory are you measuring and how are you measuring it? As far as I recall there is no easy way to measure the amount of memory GL is using to store a texture.

    That said, IIRC there is no...
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    I have tried several times to get Git to remove...

    I have tried several times to get Git to remove the blasted CRLF. It seems I failed. I will try again.

    I have built libktx on Ubuntu 12.10. I am travelling so I can't access the machine to check...
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    Official KTX GitHub repository open

    The sources are now up on GitHub at https://github.com/KhronosGroup/KTX.

    - - - Updated - - -



    Could you please submit pull requests for these fixes to the new KTX github repo. Thanks.
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    I have received approval to move the KTX sources...

    I have received approval to move the KTX sources to Github. I'll post again when I have completed the move.
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