This covers only the rendering of the shadow maps (actual use still
needs to be implemented). Working with orthographic projection matrices
is surprisingly difficult, partly because creating one includes the
translations needed to get the scene into the view (and depth range),
which means care needs to be taken with the view (camera) matrix in
order to avoid double-translating depending on just how the orthographic
matrix is set up (if it's set up to focus on the origin, then the camera
matrix will need translation, otherwise the camera matrix needs to avoid
translation).
Updating directional light CSM matrices made me realize I needed to be
able to send the contents of a packet to multiple locations in a buffer
(I may need to extend it to multiple buffers). Seems to work, but I have
only the one directional light with which to test.
This improves the projection API in that near clip is a parameter rather
than being taken directly from the cvar, and a far clip (ie, finite far
plane) version is available (necessary for cascaded shadow maps as it's
rather hard to fit a box to an infinite frustum).
Also, the orthographic projection matrix is now reversed as per the
perspective matrix (and the code tidied up a little), and a version that
takes min and max vectors is available.
gcc didn't like a couple of the changes (rightly so: one was actually
incorrect), and the fix for qfcc I didn't think to suggest while working
with Emily.
The general CFLAGS etc fixes mostly required just getting the order of
operations right: check for attributes after setting the warnings flags,
though those needed some care for gcc as it began warning about main
wanting the const attribute.
Fixing the imui link errors required moving the ui functions and setup
to vulkan_lighting.c, which is really the only place they're used.
Fixing a load of issues related to autoconf and some small source-level issues to re-add clang support.
autoconf feature detection probably needs some addressing - partially as -Werror is applied late.
This has resulted in some rather interesting information: it seems the
surfaces (and thus, presumably bounding boxes) for leafs have little to
do with the actual leaf node's volume.
This takes care of rockets and lava balls casting shadows when they
shouldn't (rockets more because the shadow doesn't look that nice, lava
balls because they glow and thus shouldn't cast shadows). Same for
flames, though the small torches lost their cool sconce shadows (need to
split up the model into flame and sconce parts and mark each
separately).
This also fixes the segfault in the previous commit.
Dynamic light shadow sizes are fixed, but can be controlled via the
dynlight_size cvar (defaults to 250).
This takes care of the type punning issue by each pass using the correct
sampler type with the correct view types bound. Also, point light and
spot light shadow maps are now guaranteed to be separated (it was just
luck that they were before) and spot light maps may be significantly
smaller as their cone angle is taken into account. Lighting is quite
borked, but at least the engine is running again.
I guess it's kind of UB, but it's handy for images that will be
conditionally written by the GPU but need to be in shader-read-only for
draw calls and the validation layers can't tell that the layers won't be
used.
This gets everything but the actual shadow map bindings working: the
validation layers don't like my type punning (which may well be the
right thing) and specialization constants don't help (yet, anyway) but I
want to get things into git.
It turns out bsp faces are still back-face culled despite the null point
being on the front of every possible plane... or really, because it's on
the front of every possible plane: sometimes the back face is the front
face, and this breaks the face selection code (a separate traversal
function will be needed for non-culling rendering).
Despite that, other than having to deal with different pipelines,
getting the model renderers working went better than expected.
This involved rewriting the descriptor update code too, but that now
feels cleaner.
The matrices are loaded into a storage buffer as it can get quite big at
6 matrices per light (and the current max lights is 768).
The parameter will be passed on to the pipeline tasks in their task
context, allowing for communication between the subsystem calling
QFV_RunRenderPass and the pipeline tasks (for the case of lighting,
passing the current matrix base index).
They're now qfv_* and shared within the vulkan renderer. qfv_z_up cannot
be shared across renderers as they have their own ideas for the world
frame. qfv_box_rotations currently can't be shared across renderers
because if the Y-axis flip and the way it's handled, but sharing should
be achievable by modifying the other renderers to handle the sides
correctly (glsl and gl need to do lookups for the side enums, sw just
needs to be shown which way is up).
The grid calculations are modified from those of Inigo Quilez
(https://iquilezles.org/articles/filterableprocedurals/), but give very
nice results: when thin enough, the lines fade out nicely instead of
producing crazy moire patterns. Though currently disabled, the default
planes are the xy, yz and zx planes with colored axes.
The biggest change was splitting up the job resources into
per-render-pass resources, allowing individual render passes to
reallocate their resources without affecting any others. After that, it
was just getting translucency and capture working after a window resize.
While there will be some GPU resources to sort out for multi-pass bsp
processing, I think this is the last piece required before shadow passes
can be implemented.
Samplers have no direct relation to render passes or pipelines, so
should not necessarily be in the same config file. This makes all the
old config files obsolete, and quite a bit of support code in vkparse.c.
This gets screenshots working again. As the implementation is now a
(trivial) state machine, the pause when grabbing a screenshot is
significantly reduced (it can be reduced even further by doing the png
compression in a separate thread).
The new system seems to work quite nicely with brush models, which was
the intent, but it's nice to see. Hopefully, it works well when it comes
to shadows. There's still water warp and screen shots to fix, and
fisheye to get working, as well.
Gotta be sure :)
With the new system mostly up and running (just bsp rendering and
descriptor sets/layout handling to go, and they're independent of the
old render pass system), the old system can finally be cleared out.
The particles die instantly due to curFrame not updating (next commit),
but otherwise work nicely, especially sync is better (many thanks to
Darian for his help with understanding sync scope).
