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Removed more usage of alloca() dependent on maximum valence:

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- replaced alloca() usage in far/gregoryBasis.cpp with StackBuffer
This commit is contained in:
barfowl 2015-05-15 17:20:03 -07:00
parent ffc7678e1c
commit 2ec507e107
1 changed files with 4 additions and 9 deletions
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13
opensubdiv/far/gregoryBasis.cpp
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@ -26,6 +26,7 @@
#include "../far/error.h"
#include "../far/stencilTablesFactory.h"
#include "../far/topologyRefiner.h"
#include "../vtr/stackBuffer.h"
#include <cassert>
#include <cmath>
@ -140,17 +141,11 @@ GregoryBasis::ProtoBasis::ProtoBasis(
valences[4],
zerothNeighbors[4];
Index * manifoldRing = (int *)alloca((maxvalence+2)*2 * sizeof(int));
Vtr::internal::StackBuffer<Index,40> manifoldRing((maxvalence+2)*2);
// Because MSVC does not support VLAs, we have to run alloca() in a macro and
// call in-place constructors - it's only been standardized for 15 years after
// all...
#define AllocaPointsArrays(variable, npoints) \
Point * variable = (Point *)alloca(npoints*sizeof(Point)); \
{ for (int i=0; i<npoints; ++i) { new (&variable[i]) Point; } }
Vtr::internal::StackBuffer<Point,16> f(maxvalence);
Vtr::internal::StackBuffer<Point,64> r(maxvalence*4);
AllocaPointsArrays(f, maxvalence);
AllocaPointsArrays(r, maxvalence*4);
Point e0[4], e1[4], org[4];
for (int vid=0; vid<4; ++vid) {