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d3d12: Fix alloc function

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It may generate wrong result in very rare circumstance, although I never
experienced it.
This commit is contained in:
vlj 2015-06-26 18:31:51 +02:00 • committed by Vincent Lejeune
commit fd269f3adc
1 changed files with 11 additions and 11 deletions
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22
rpcs3/Emu/RSX/D3D12/D3D12GSRender.h
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@ -137,26 +137,25 @@ struct DataHeap
*/ */
bool canAlloc(size_t size) bool canAlloc(size_t size)
{ {
size_t putPos = m_putPos, getPos = m_getPos;
size_t allocSize = align(size, Alignment); size_t allocSize = align(size, Alignment);
if (putPos + allocSize < m_size) if (m_putPos + allocSize < m_size)
{ {
// range before get // range before get
if (putPos + allocSize < getPos) if (m_putPos + allocSize < m_getPos)
return true; return true;
// range after get // range after get
if (putPos > getPos) if (m_putPos > m_getPos)
return true; return true;
return false; return false;
} }
else else
{ {
// ..]....[..get.. // ..]....[..get..
if (putPos < getPos) if (m_putPos < m_getPos)
return false; return false;
// ..get..]...[... // ..get..]...[...
// Actually all resources extending beyond heap space starts at 0 // Actually all resources extending beyond heap space starts at 0
if (allocSize > getPos) if (allocSize > m_getPos)
return false; return false;
return true; return true;
} }
@ -165,15 +164,16 @@ struct DataHeap
size_t alloc(size_t size) size_t alloc(size_t size)
{ {
assert(canAlloc(size)); assert(canAlloc(size));
size_t putPos = m_putPos; size_t allocSize = align(size, Alignment);
if (putPos + size < m_size) if (m_putPos + allocSize < m_size)
{ {
m_putPos += align(size, Alignment); size_t oldPutPos = m_putPos;
return putPos; m_putPos += allocSize;
return oldPutPos;
} }
else else
{ {
m_putPos = align(size, Alignment); m_putPos = allocSize;
return 0; return 0;
} }
} }