The Panfrost hardware already supports controlling ASTC decode
precision via the Decode Wide plane descriptor field. Wire up the
Vulkan extension by parsing VkImageViewASTCDecodeModeEXT from the
image view pNext chain and setting astc.narrow when the application
requests VK_FORMAT_R8G8B8A8_UNORM decode mode.
The extension is limited to v9+ since the ASTC plane descriptors
with Decode Wide/HDR fields only exist from Valhall onwards.
decodeModeSharedExponent is not supported.
Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39799>
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