[Pico][OpenXR][XRLayers] Cannot create cubemap layers from compressed textures

[svillar]

So the Pico's OpenXR implementation does support the following swapchain formats

E/PxrRuntime: createInfo->format = 0x00008c43,c->info.formats[0] = 0x00008058
E/PxrRuntime: createInfo->format = 0x00008c43,c->info.formats[1] = 0x00008d62
E/PxrRuntime: createInfo->format = 0x00008c43,c->info.formats[2] = 0x00008059
E/PxrRuntime: createInfo->format = 0x00008c43,c->info.formats[3] = 0x0000881a
E/PxrRuntime: createInfo->format = 0x00008c43,c->info.formats[4] = 0x00008c43

which are the hex representation of

GL_RGBA8
GL_RGB565
GL_RGB10_A2_EXT
GL_RGBA16F_ARB
GL_SRGB8_ALPHA8_EXT

Out cubemap textures are using the KTX's COMPRESSED_RGB8_ETC2 format. This basically means that we cannot create the cubemap layer using the same textures we use for Meta devices for example.

As this depends on the SDK, we could perhaps provide non-compressed versions to be used by Pico's devices

[svillar]

Would love to file the bug against Pico's SDK, but in the meantime we should look for alternatives.

[svillar]

Pico OS 5.4.0 brings support for compressed textures so we can resume this work and get rid of the PNGs,