- EGL swap semantics make the presented colour buffer's content undefined at
its next acquire (EGL_BUFFER_DESTROYED, the implementation default) and
every ancillary depth/stencil buffer's content undefined after ANY swap,
yet the default-FBO render pass reloaded both with LOAD_OP_LOAD every
frame; SwapchainObject now tracks per-image content validity (defined when
a pass stores into the attachment, invalidated at present) and the
render-pass manager turns an undefined attachment's tile load into
LOAD_OP_DONT_CARE with initialLayout=UNDEFINED, keyed into both hashes so
the cached LOAD variants cannot be hit by mistake
- the default framebuffer's depth attachment is now attached ON DEMAND: a
draw with depth test and stencil test both disabled (GL: a disabled test
neither reads nor writes its buffer), and no pending depth/stencil clear,
resolves to a depth-less pass flavour, dropping the D24S8 tile load AND
store outright - MC 26.2 renders its GUI into its own FBO and only ever
blits colour to the default framebuffer, so its swapchain pass carried a
full-screen depth round-trip for nothing
- the flavour only escalates: an active depth-full pass absorbs depth-less
draws unchanged, while a depth-using draw against a depth-less pass
resolves to an incompatible entry and splits, its depth loading DONT_CARE
(the content was undefined all along); the depth-less flavour is folded
into ComputeHash and the per-draw fast-path memo so the two flavours can
never alias
swung0x48