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[wip] MeshTools: utils for generating lines. 

TODO: better commit msg
TODO: this is all useless and obsolete, rework
pull/610/head
Vladimír Vondruš 4 years ago
parent
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3 changed files with 218 additions and 0 deletions
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  1. 2
      src/Magnum/MeshTools/CMakeLists.txt
  2. 162
      src/Magnum/MeshTools/GenerateLines.cpp
  3. 54
      src/Magnum/MeshTools/GenerateLines.h

2
src/Magnum/MeshTools/CMakeLists.txt
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@ -41,6 +41,7 @@ set(MagnumMeshTools_GracefulAssert_SRCS
FilterAttributes.cpp FilterAttributes.cpp
FlipNormals.cpp FlipNormals.cpp
GenerateIndices.cpp GenerateIndices.cpp
GenerateLines.cpp
GenerateNormals.cpp GenerateNormals.cpp
Interleave.cpp Interleave.cpp
Reference.cpp Reference.cpp
@ -56,6 +57,7 @@ set(MagnumMeshTools_HEADERS
FilterAttributes.h FilterAttributes.h
FlipNormals.h FlipNormals.h
GenerateIndices.h GenerateIndices.h
GenerateLines.h
GenerateNormals.h GenerateNormals.h
Interleave.h Interleave.h
InterleaveFlags.h InterleaveFlags.h

162
src/Magnum/MeshTools/GenerateLines.cpp
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@ -0,0 +1,162 @@
/*
This file is part of Magnum.
Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
2020, 2021, 2022 Vladimír Vondruš <mosra@centrum.cz>
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#include "GenerateLines.h"
#include <Corrade/Containers/StridedArrayView.h>
#include "Magnum/DimensionTraits.h"
#include "Magnum/Math/Vector3.h"
namespace Magnum { namespace MeshTools {
namespace {
// TODO take line segment count? easier to document, harder to use with a strip/loop
template<class T> inline void generateLineIndicesIntoImplementation(const std::size_t lineStripPointCount, const Containers::StridedArrayView1D<T>& indices) {
// TODO assert lineStripPointCount > 2 and indices.size() == (lineStripPointCount - 1)*6
for(std::size_t i = 0, max = lineStripPointCount/2; i != max; ++i) {
/* For consistency same as the Text library does
0---2 0---2 5
| | | / /|
| | | / / |
| | |/ / |
1---3 1 3---4 */
indices[i*6 + 0] = i*4 + 0;
indices[i*6 + 1] = i*4 + 1;
indices[i*6 + 2] = i*4 + 2;
indices[i*6 + 3] = i*4 + 1;
indices[i*6 + 4] = i*4 + 3;
indices[i*6 + 5] = i*4 + 2;
}
}
}
void generateLineIndicesInto(const std::size_t lineStripPointCount, const Containers::StridedArrayView1D<UnsignedInt>& indices) {
return generateLineIndicesIntoImplementation(lineStripPointCount, indices);
}
void generateLineIndicesInto(const std::size_t lineStripPointCount, const Containers::StridedArrayView1D<UnsignedShort>& indices) {
return generateLineIndicesIntoImplementation(lineStripPointCount, indices);
}
/* TODO useful for anything?? need to cap like SVG
0-------+-----+-+
| / |/
A---------B /
| / / /|
2---/---/-----+
/ / /
/ / /
+---C---+ */
namespace {
// TODO take indices?
template<UnsignedInt dimensions> void generateLinesIntoImplementation(const Containers::StridedArrayView1D<const VectorTypeFor<dimensions, Float>>& lineStripPositions, const Containers::StridedArrayView1D<VectorTypeFor<dimensions, Float>>& positions, const Containers::StridedArrayView1D<VectorTypeFor<dimensions, Float>>& directions, const Containers::StridedArrayView1D<VectorTypeFor<dimensions, Float>>& neighborDirections, const bool loop) {
// TODO assert lineStripPositions.size() > 2 and positions,tangents,normals.size() == (lineStripPositions.size() - 1)*4
for(std::size_t i = 0, max = lineStripPositions.size() - 1; i != max; ++i) {
/*
Illustrative example of a line segment from A to B, with quad
corners 0, 1, 2 and 3. Each gets either a `+d` or `-d` for the
segment direction, and `pd` or `nd` for prev/next directions. The
next segment is from B to C, forming the `nd`, and A is the first
point of a line strip, so `pd` will be a zero vector.
TODO this is outdated, all directions should be the same
<-d-0-----------2-+d-> direction: +---->
| / \
A---------B nd prevDirection: +
| / \ v
<-d-1-------3-+d-> \ nextDirection: +
\ \ . \
nd . . \
v C . v
*/
const VectorTypeFor<dimensions, Float> a = lineStripPositions[i + 0];
const VectorTypeFor<dimensions, Float> b = lineStripPositions[i + 1];
const VectorTypeFor<dimensions, Float> direction = b - a;
/* Direction to the previous point. If we're at the line start, it's
a zero vector to indicate that a line cap should be drawn, otherwise
it's a normalized vector. */
// TODO normalization clashes with zero-length line segments, thse
// would be zero as well, causing caps to appear
VectorTypeFor<dimensions, Float> prevDirection{NoInit};
if(i == 0) {
if(!loop) prevDirection = {};
else prevDirection = (lineStripPositions[max] - a).normalized();
} else prevDirection = (lineStripPositions[i - 1] - a).normalized();
/* Direction to the next point. If we're at the line end, it's a zero
vector to indicate that a line cap should be drawn, otherwise it's a
normalized vector. */
// TODO normalization clashes with zero-length line segments, thse
// would be zero as well, causing caps to appear
VectorTypeFor<dimensions, Float> nextDirection{NoInit};
if(i + 1 == max) {
if(!loop) nextDirection = {};
else nextDirection = (lineStripPositions[0] - a).normalized();
} else nextDirection = (lineStripPositions[i + 2] - b).normalized();
/* Save all output for this segment. Since the line width is a shader
input, the quad actually has no width at all, it's expanded later
with the help of normal and tangent properties */
positions[i*4 + 0] = positions[i*4 + 2] = a;
positions[i*4 + 1] = positions[i*4 + 3] = a;
neighborDirections[i*4 + 0] = neighborDirections[i*4 + 2] = prevDirection;
neighborDirections[i*4 + 1] = neighborDirections[i*4 + 3] = nextDirection;
directions[i*4 + 0] = direction;
directions[i*4 + 1] = direction;
directions[i*4 + 2] = direction;
directions[i*4 + 3] = direction;
}
}
}
void generateLineStripInto(const Containers::StridedArrayView1D<const Vector2>& lineStripPositions, const Containers::StridedArrayView1D<Vector2>& positions, const Containers::StridedArrayView1D<Vector2>& directions, const Containers::StridedArrayView1D<Vector2>& neighborDirections) {
return generateLinesIntoImplementation<2>(lineStripPositions, positions, directions, neighborDirections, false);
}
void generateLineStripInto(const Containers::StridedArrayView1D<const Vector3>& lineStripPositions, const Containers::StridedArrayView1D<Vector3>& positions, const Containers::StridedArrayView1D<Vector3>& directions, const Containers::StridedArrayView1D<Vector3>& neighborDirections) {
return generateLinesIntoImplementation<3>(lineStripPositions, positions, directions, neighborDirections, false);
}
void generateLineLoopInto(const Containers::StridedArrayView1D<const Vector2>& lineLoopPositions, const Containers::StridedArrayView1D<Vector2>& positions, const Containers::StridedArrayView1D<Vector2>& directions, const Containers::StridedArrayView1D<Vector2>& neighborDirections) {
return generateLinesIntoImplementation<2>(lineLoopPositions, positions, directions, neighborDirections, true);
}
void generateLineLoopInto(const Containers::StridedArrayView1D<const Vector3>& lineLoopPositions, const Containers::StridedArrayView1D<Vector3>& positions, const Containers::StridedArrayView1D<Vector3>& directions, const Containers::StridedArrayView1D<Vector3>& neighborDirections) {
return generateLinesIntoImplementation<3>(lineLoopPositions, positions, directions, neighborDirections, true);
}
// Trade::MeshData generateLineStrip(
}}

54
src/Magnum/MeshTools/GenerateLines.h
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@ -0,0 +1,54 @@
#ifndef Magnum_MeshTools_GenerateLines_h
#define Magnum_MeshTools_GenerateLines_h
/*
This file is part of Magnum.
Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
2020, 2021, 2022 Vladimír Vondruš <mosra@centrum.cz>
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#include "Magnum/MeshTools/visibility.h"
#include "Magnum/Trade/Trade.h"
namespace Magnum { namespace MeshTools {
void generateLineIndicesInto(std::size_t lineStripPointCount, const Containers::StridedArrayView1D<UnsignedInt>& indices);
void generateLineIndicesInto(std::size_t lineStripPointCount, const Containers::StridedArrayView1D<UnsignedShort>& indices);
void generateLineStripInto(const Containers::StridedArrayView1D<const Vector2>& lineStripPositions, const Containers::StridedArrayView1D<Vector2>& positions, const Containers::StridedArrayView1D<Vector2>& directions, const Containers::StridedArrayView1D<Vector2>& neighborDirections);
void generateLineStripInto(const Containers::StridedArrayView1D<const Vector3>& lineStripPositions, const Containers::StridedArrayView1D<Vector3>& positions, const Containers::StridedArrayView1D<Vector3>& directions, const Containers::StridedArrayView1D<Vector3>& neighborDirections);
void generateLineLoopInto(const Containers::StridedArrayView1D<const Vector2>& lineStripPositions, const Containers::StridedArrayView1D<Vector2>& positions, const Containers::StridedArrayView1D<Vector2>& directions, const Containers::StridedArrayView1D<Vector2>& neighborDirections);
void generateLineLoopInto(const Containers::StridedArrayView1D<const Vector3>& lineStripPositions, const Containers::StridedArrayView1D<Vector3>& positions, const Containers::StridedArrayView1D<Vector3>& directions, const Containers::StridedArrayView1D<Vector3>& neighborDirections);
// Trade::MeshData generateLineStrip(const Containers::StridedArrayView1D<const Vector2>& lineStripPositions);
//
// Trade::MeshData generateLineLoop(const Containers::StridedArrayView1D<const Vector2>& lineStripPositions);
// TODO take indexed line segments, probably? can't work with strips
// TODO *fuck* can't work with that either, need to generate triangles from scratch
}}
#endif
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