Looking at the snippets, these seem to have been written back when there
was no builtin shaders yet, it seems, not to mention
MeshTools::compile(), Trade::MeshData or any of the other high-level
APIs. Rather overwhelming to just throw huge code snippets at the user,
explaining a workflow with a custom-made mesh that's going to be drawn
with a custom-made shader, which is like level 999 of using the GL
library.
It was rather discouraging to start "Basic usage" with a boring-ass long
snippet. On the other hand showing just compile() first would lead
people to think it's all some opaque magic, so trying to balance that a
bit.
Also why the hell was the compile() snippet showing the horrendous GL
way of specifying attribute formats? This is not great either but at
least not redundant.
Memory-maps the file and uses openMemory() instead of openFile(). For
efficient data formats (such as glTF) can avoid reading the whole blob
if only the metadata or a part of the file is needed (for example the
peak usage for --info-materials with the Buggy.glb example model went
from 8.5 MB to 991 kB, as it reads just the JSON at the start and never
even pages in the buffer blobs at the end).
This currently only works for standalone files, files that reference
external images etc. would need to have file callbacks implemented. And
it's Sunday and I'm lazy.
Using openMemory() instead of openData() allows the implementation to
assume the data will stay in scope for as long as needed, which can
prevent unnecessary copies in some plugin implementations.
It warranted a new flag, DataFlag::ExternallyOwned, to describe this
kind of memory. I couldn't reuse Owned as that's used for allocations
owned by the instance, which is too little for certain future use cases.
For example returning *Data instances referencing an Owned memory would
mean the user has to assume the memory is gone when the importer
instance is gone, and that's generally not true for memory passed to
openMemory().
Originally I thought I would do this later, but then realized the
existing plugin implementations would need to get all updated again to
be aware of the new flag, with some being forgotten, and it's just
easier to do the whole thing in a single step.
This makes it much less annoying to pass arbitrarily typed data, such as
std::uint8_t or char8_t and what not. It was already done like this for
the new shader converter plugins, where the input is often 32-bit ints
for SPIR-V.
OTOH the internal virtual API is kept with ArrayView<const char>, as
that makes it easier to operate on by the implementations.
This allows to better describe memory ownership and transfer it instead
of forcing the plugins to allocate their own local copy if the import
happens in-place on the imported data. Right now that's mainly for the
openFile() use case, which implicitly allocated an Array with file
contents only to pass it to openData() which then made a copy because it
could not make any assumption about data scope.
In other words, certain plugins (TgaImporter, KtxImporter, DdsImporter,
CgltfImporter and possibly others) will now have their peak memory usage
*halved*.
Because it was getting annoying to scroll through the output, especially
with shitty files that duplicate materials etc. The --info is now a
shortcut for specifying all other --info options together.
Yes, this is only ever provided by an ANGLE extension, and as you might
have guessed, The Great Google Overlords didn't bother caring to have
this supported outside of their browser.
Thanks Google, for your careless fuckall way of creating private ANGLE
extensions that then immediately get exposed to Chrome and Chrome only.
Way to go!!
Unlike most other extensions, this one has to be explicitly enabled in
Emscripten in order to be used. Which thus done as part of other "driver
workarounds" done on startup. To avoid that, the extension can be
explicitly disabled, and thanks to the previous commit the disabling
will be performed before the extension is attempted to be enabled.
Hah, so many overloads. Not providing mutable access to keys or layer
offsets as that would break the invariant of the internal array always
being sorted.
And update docs in Matrix[34]::rotation() and related functions to note
this. This is a breaking change that may cause existing code to start
asserting.
There's now 24 overloads for unsigned types and 24 for signed types,
which is all possible combinations. Not adding an ability to cast
between signed and unsigned as I'm not sure what should be done there.
And add a comment explaining why we don't check the pointer for empty
meshes -- otherwise empty interleaved meshes would fail with stuff like
Trade::MeshData: attribute 0 [0xc:0xc] is not contained in passed
vertexData array [0x0:0x0]
which ... helps nobody.
Because a MeshView might not be the best thing to have when you are
submitting a batch of thousand draws. It takes a strided array views to
allow for more flexibility, but can also detect if the input is already
contiguous and use it as-is.
UNFORTUNATELY the GL 1.0 legacy still continues to stink and so there
has to be a 64-bit-specific overload which is the *actual* variant that
doesn't allocate because glMultiDrawElements takes a `void**` for INDEX
OFFSETS and it's IN BYTES! Which foolish soul designed such a thing back
in the 1860s, I wonder. There's no reason to not have an index offset
in elements because all indices have to have the same type ANYWAY. And
yes, I wasted about three hours debugging driver crashes because I
THOUGHT this parameter takes offset in elements, not bytes.
Also note: on 32-bit platforms this depends on latest Corrade with the
CORRADE_TARGET_32BIT definition. Spent an embarrassing amount of time
wondering why all local builds but Emscripten work.
The multi-level APIs still don't check anything regarding level sizes
and order since for example *.ico has no restrictions at all. But the
rest (like non-zero size) is a restriction for all file formats I'm
aware of.
TgaImageConverter test had to be adapted, I expect a lot of breakages in
plugins tests as well. But user code should be fine I think. Also
reduced the rather excessive dimensions in AbstractImageConverterTest,
since the allocation requirement now made the default Emscripten heap
OOM.
Vladimír Vondruš