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Apply temporary stack-memory optimization, thanks to Jim Tillander

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(old pull request 316 https://github.com/bulletphysics/bullet3/pull/316)
You can disable this in the build system, by adding preprocessor define 'BT_DISABLE_STACK_TEMP_MEMORY'
This commit is contained in:
Erwin Coumans
2017-03-13 22:27:37 -07:00
parent 11975ec60b
commit bbefc8fe7e
1 changed files with 11 additions and 0 deletions
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11
src/BulletCollision/BroadphaseCollision/btDbvt.h
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@@ -942,7 +942,13 @@ inline void btDbvt::collideTV( const btDbvtNode* root,
ATTRIBUTE_ALIGNED16(btDbvtVolume) volume(vol); ATTRIBUTE_ALIGNED16(btDbvtVolume) volume(vol);
btAlignedObjectArray<const btDbvtNode*> stack; btAlignedObjectArray<const btDbvtNode*> stack;
stack.resize(0); stack.resize(0);
#ifndef BT_DISABLE_STACK_TEMP_MEMORY
char tempmemory[SIMPLE_STACKSIZE*sizeof(const btDbvtNode*)];
stack.initializeFromBuffer(tempmemory, 0, SIMPLE_STACKSIZE);
#else
stack.reserve(SIMPLE_STACKSIZE); stack.reserve(SIMPLE_STACKSIZE);
#endif //BT_DISABLE_STACK_TEMP_MEMORY
stack.push_back(root); stack.push_back(root);
do { do {
const btDbvtNode* n=stack[stack.size()-1]; const btDbvtNode* n=stack[stack.size()-1];
@@ -1078,7 +1084,12 @@ inline void btDbvt::rayTest( const btDbvtNode* root,
int depth=1; int depth=1;
int treshold=DOUBLE_STACKSIZE-2; int treshold=DOUBLE_STACKSIZE-2;
char tempmemory[DOUBLE_STACKSIZE * sizeof(const btDbvtNode*)];
#ifndef BT_DISABLE_STACK_TEMP_MEMORY
stack.initializeFromBuffer(tempmemory, DOUBLE_STACKSIZE, DOUBLE_STACKSIZE);
#else//BT_DISABLE_STACK_TEMP_MEMORY
stack.resize(DOUBLE_STACKSIZE); stack.resize(DOUBLE_STACKSIZE);
#endif //BT_DISABLE_STACK_TEMP_MEMORY
stack[0]=root; stack[0]=root;
btVector3 bounds[2]; btVector3 bounds[2];
do { do {