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Improve btTriangleMesh abuse (bug #6027, part 2)

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This commit is contained in:
Alexei Dobrohotov 2023-03-08 04:24:52 +03:00
parent cbd14833fd
commit 2277bdc1ae
2 changed files with 19 additions and 17 deletions
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3
apps/openmw_test_suite/nifloader/testbulletnifloader.cpp
View File

@ -317,17 +317,20 @@ namespace
mNiTriShapeData.recType = Nif::RC_NiTriShapeData;
mNiTriShapeData.vertices = { osg::Vec3f(0, 0, 0), osg::Vec3f(1, 0, 0), osg::Vec3f(1, 1, 0) };
mNiTriShapeData.mNumTriangles = 1;
mNiTriShapeData.triangles = { 0, 1, 2 };
mNiTriShape.data = Nif::NiGeometryDataPtr(&mNiTriShapeData);
mNiTriShapeData2.recType = Nif::RC_NiTriShapeData;
mNiTriShapeData2.vertices = { osg::Vec3f(0, 0, 1), osg::Vec3f(1, 0, 1), osg::Vec3f(1, 1, 1) };
mNiTriShapeData2.mNumTriangles = 1;
mNiTriShapeData2.triangles = { 0, 1, 2 };
mNiTriShape2.data = Nif::NiGeometryDataPtr(&mNiTriShapeData2);
mNiTriStripsData.recType = Nif::RC_NiTriStripsData;
mNiTriStripsData.vertices
= { osg::Vec3f(0, 0, 0), osg::Vec3f(1, 0, 0), osg::Vec3f(1, 1, 0), osg::Vec3f(0, 1, 0) };
mNiTriStripsData.mNumTriangles = 2;
mNiTriStripsData.strips = { { 0, 1, 2, 3 } };
mNiTriStrips.data = Nif::NiGeometryDataPtr(&mNiTriStripsData);
}

33
components/nifbullet/bulletnifloader.cpp
View File

@ -40,26 +40,28 @@ namespace
return letterPos < path.size() && (path[letterPos] == 'x' || path[letterPos] == 'X');
}
void prepareTriangleMesh(btTriangleMesh& mesh, const Nif::NiTriBasedGeomData& data)
{
// FIXME: copying vertices/indices individually is unreasonable
const std::vector<osg::Vec3f>& vertices = data.vertices;
mesh.preallocateVertices(static_cast<int>(vertices.size()));
for (const osg::Vec3f& vertex : vertices)
mesh.findOrAddVertex(Misc::Convert::toBullet(vertex), false);
mesh.preallocateIndices(static_cast<int>(data.mNumTriangles * 3));
}
void fillTriangleMesh(btTriangleMesh& mesh, const Nif::NiTriShapeData& data)
{
const std::vector<osg::Vec3f>& vertices = data.vertices;
prepareTriangleMesh(mesh, data);
const std::vector<unsigned short>& triangles = data.triangles;
mesh.preallocateVertices(static_cast<int>(vertices.size()));
mesh.preallocateIndices(static_cast<int>(triangles.size()));
for (std::size_t i = 0; i < triangles.size(); i += 3)
{
mesh.addTriangle(Misc::Convert::toBullet(vertices[triangles[i + 0]]),
Misc::Convert::toBullet(vertices[triangles[i + 1]]),
Misc::Convert::toBullet(vertices[triangles[i + 2]]));
}
mesh.addTriangleIndices(triangles[i + 0], triangles[i + 1], triangles[i + 2]);
}
void fillTriangleMesh(btTriangleMesh& mesh, const Nif::NiTriStripsData& data)
{
mesh.preallocateVertices(static_cast<int>(data.vertices.size()));
mesh.preallocateIndices(static_cast<int>(data.mNumTriangles));
prepareTriangleMesh(mesh, data);
for (const std::vector<unsigned short>& strip : data.strips)
{
if (strip.size() < 3)
@ -75,13 +77,10 @@ namespace
c = strip[i];
if (a == b || b == c || a == c)
continue;
const btVector3 vertexA = Misc::Convert::toBullet(data.vertices[a]);
const btVector3 vertexB = Misc::Convert::toBullet(data.vertices[b]);
const btVector3 vertexC = Misc::Convert::toBullet(data.vertices[c]);
if (i % 2 == 0)
mesh.addTriangle(vertexA, vertexB, vertexC);
mesh.addTriangleIndices(a, b, c);
else
mesh.addTriangle(vertexA, vertexC, vertexB);
mesh.addTriangleIndices(a, c, b);
}
}
}