To actually achieve improved performance with the OpenGL 2 renderer,
we have to cache geometry that doesn't change when the viewport does
(note that the rendered pixels can change quite dramatically because
we can reconfigure shaders; e.g. stippling can be drawn in screen
coordinates).
This commit adds a BatchCanvas interface that can be implemented
by renderers, and uses it for drawing entities such as lines and
points.
There are two main reasons to desire an OpenGL 2 renderer:
1. Compatibility. The compatibility profile, ironically, does not
offer a lot of compatibility, and our OpenGL 1 renderer will not
run on Android, iOS, or WebGL.
2. Performance. The immediate mode does not scale, and in fact
becomes very slow with only a moderate amount of lines on screen,
and only a somewhat large amount of triangles.
This commit implements a basic OpenGL 2 renderer that uses only
features from the (OpenGL 3.2) core profile. It is not yet faster
than the OpenGL 1 renderer, primarily because it uses a lot of small
draw calls.
This commit uses OpenGL 2 on Linux and Mac OS X directly (i.e. links
to the GL symbols from version 2+); on Windows this is impossible
with the default drivers, so for now OpenGL 1 is still used there.
OpenGL 2 and newer do not have the glPolygonMode(..., GL_LINES) API,
so produce the wireframe on our side. It's somewhat slow, and draws
every line three times, but it is cached when the OpenGL 2 renderer
is used, and this should do for a debugging feature.
This specific implementation seems to have lingered from the days
before IdList was stored sorted. This commit has resulted in a ~5%
improvement in Generate::DIRTY time for modelisation.slvs on a GCC 6
release build.
gcc 6 displays these when compiling in release mode; all of these
warnings except the rankOk one were benign because there would have
been an error about the incomplete switch statement.
The rankOk warning highlighted a real problem: bailing early to
didnt_converge would have branched on an uninitialized variable.
This is a common and convenient behavior; the basename is
pre-selected, so exporting multiple views requires just one keystroke
to put the cursor after the basename.
This is useful in case one wants to create a workplane based on
one of the reference ones, to be explicit, or to avoid fishing out
again the line segments used to create a workplane at an angle.
If a generated mesh is non-watertight, and this is not noticed for
some reason (e.g. the markers are dismissed), and the mesh is
exported for further processing, it could cause problems down
the line.
Before this commit, every debug message was correctly printed
to stdout, but they were all concatenated onto a single line in
the Visual Studio "Output" pane.
GroupsInOrder is an extremely hot function, especially during object
picking: before this commit, it was easy to get second plus latencies
on picking, and after this commit picking is almost real-time.
Abstract the exact details of the OpenGL renderer in the render.h
header; this allows us to use GL-specific types in the renderer
class and functions without including OpenGL (and Windows, where
applicable) headers in every source file.
We do not support clobbering the source tree with build products,
nor recommend this in any documentation, and this already leads to
weird bugs with the resource system. Show an explicit error in this
case to avoid confusion.
These points can be used for constraining the width of the text
(or to the width of the text).
The main parts of the commit are:
* TtfFont is restructured to be able to return the aspect ratio
for a given string.
* This aspect ratio is written to the savefile, such that even if
the font is missing, the sketch would still be solved correctly.
* The two additional points are constrained via perpendicularly
to the two main points (which form a v vector).
The compatibility features are as follows:
* When the font is missing in old files, 1:1 aspect ratio is used,
which works for the replacement symbol anyhow.
* When the two additional points are missing in old files, their
would-be positions are calculated and they are moved there,
avoiding 'jumping' of underconstrained sketches.
SolveSpace 2.0 used the height of 'A' (i.e. cap height) to determine
the reference height.
SolveSpace 2.1 completely broke that during transition to Freetype,
and used something more or less random, by using FT_Set_Char_Size
with units_per_EM.
SolveSpace 2.2 attempted to fix that, but also used something more
or less random, by using FT_Request_Size with "unit" values.
Turns out that Freetype actually doesn't have a concept of cap height
at all. It is possible to extract it from the TT_OS2 table that is
present in some TrueType fonts, but it is not present in Microsoft
fonts (the msttcorefonts ones), and for those Linux fonts in which
it is present it doesn't appear very reliable.
So instead, use the height of 'A' instead, like version 2.0 did.
This has the advantage that it is quite bulletproof, and also matches
exactly what the old files are measured against.
One downside is that fonts without an 'A' glyph would not render.
We can deal with that when it becomes a problem.
This is a bit slow, but more importantly creates a race condition
where e.g. a failing "normal" test will be overwritten by
a succeeding "normal_migrate_from_v20".
This shouldn't ever be a problem since saving dumps the entire
internal state, or is supposed to, at least.
Apitrace uses swapping buffers to determine frame boundaries; before
this commit, everything solvespace renders gets put into a single
frame. Since we don't use double-buffered rendering, the call does
nothing (and is legal to perform), but apitrace output becomes
readable.
Sometimes, after a large change in a sketch, constraints that are
geometrically fine may still cause the rank test to fail. One way
this can happen is VectorsParallel() pivoting wrong due to the big
move, converging anyways but ending up singular. It would then
re-pivot correctly on the new solution when you re-solve, making
this a transient error. This is visible when dragging the arm in
the jansen-asm.slvs example.
After this commit, if the rank test fails, equations are regenerated
the Jacobian is rewritten, and the rank test is retried, which
prevents these transient errors from interfering with dragging.
The problem described above was invisible before c011444, as rank
test was only performed before solving.
A system solved as REDUNDANT_OKAY is still solved correctly,
even if the UI would consider this an error, in case that
g->allowRedundant==false. So there's no reason to discard this
solution; we might find it useful if a system loses a degree of
freedom while dragging, or to avoid regeneration after redundant
constraints are allowed.
This commit also reverts commit 3ff236c, as that is not necessary
anymore.
Before this commit, the outlines are generated in an arbitrary order
from the kd-tree. This worked just fine for continuous lines, but
for stippling, especially on curves, this meant that most of
the piecewise linear edges would have the stippling phase restart
from zero, leading to a very poor appearance.
These were useful before because chord tolerance depended on the zoom
level; and so the first generation produced a crude mesh used to
set the zoom level, and the second actually did useful work.
Chord tolerance is now independent of the zoom level, so this code
is no longer useful.
Before this commit, a translate group based on another translate
group would always use the "union" boolean operation, which does not
work at all if one wants an array with a difference operation, and
results in degraded performance if one wants an array with
an assemble operation.
This significantly improves performance e.g. in case of a sketch
containing a multitude of wooden panels, as the meshes can be
merely transformed instead of being joined.
EvilSpirit
whitequark
Elvira Khabirova