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StreamBuffer: Don't wait on fences twice when reserve > commit

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If we allocate a large amount of memory (A), commit a smaller amount,
then allocate memory smaller than allocation A, we will have already
waited for these fences in A, but not used the space. In this case,
don't set m_free_iterator to a position before that which we know is
safe to use, which would result in waiting on the same fence(s) next
time.
This commit is contained in:
Stenzek 2017-09-09 13:18:48 +10:00
parent ce670c1851
commit 9e1c09e347
1 changed files with 7 additions and 1 deletions
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8
Source/Core/VideoBackends/OGL/StreamBuffer.cpp
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@ -97,7 +97,13 @@ void StreamBuffer::AllocMemory(u32 size)
glClientWaitSync(m_fences[i], GL_SYNC_FLUSH_COMMANDS_BIT, GL_TIMEOUT_IGNORED);
glDeleteSync(m_fences[i]);
}
m_free_iterator = m_iterator + size;
// If we allocate a large amount of memory (A), commit a smaller amount, then allocate memory
// smaller than allocation A, we will have already waited for these fences in A, but not used
// the space. In this case, don't set m_free_iterator to a position before that which we know
// is safe to use, which would result in waiting on the same fence(s) next time.
if ((m_iterator + size) > m_free_iterator)
m_free_iterator = m_iterator + size;
// if buffer is full
if (m_iterator + size >= m_size)