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Workaround Nvidia bugs.

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This solution is still bad, as it really does wait for the query
results, which stalls the CPU.
This commit is contained in:
Bartosz Taudul 2018-06-17 20:48:02 +02:00
parent 1b64e84945
commit 4767dbad5b
1 changed files with 28 additions and 6 deletions
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34
TracyVulkan.hpp
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@ -107,16 +107,38 @@ public:
if( m_tail == m_head ) return;
auto cnt = m_head < m_tail ? QueryCount - m_tail : m_head - m_tail;
int64_t res[QueryCount];
const auto cnt = m_head < m_tail ? QueryCount - m_tail : m_head - m_tail;
vkGetQueryPoolResults( m_device, m_query, m_tail, cnt, sizeof( res ), res, sizeof( *res ), VK_QUERY_RESULT_64_BIT | VK_QUERY_RESULT_WITH_AVAILABILITY_BIT );
// This memset is required, because Nvidia drivers seem to break Vulkan spec: "If VK_QUERY_RESULT_WITH_AVAILABILITY_BIT
// is set, the final integer value written for each query is non-zero if the query's status was available or zero if the
// status was unavailable."
// Nvidia drivers in some cases do not write the non-zero value, even if the following zero values are written.
memset( res, 0xFF, sizeof( *res ) * cnt );
if( vkGetQueryPoolResults( m_device, m_query, m_tail, cnt, sizeof( res ), res, sizeof( *res ), VK_QUERY_RESULT_64_BIT | VK_QUERY_RESULT_WITH_AVAILABILITY_BIT ) == VK_NOT_READY )
{
unsigned int idx;
for( idx=0; idx<cnt; idx++ )
{
if( res[idx] == 0 ) break;
}
if( idx == 0 ) return;
cnt = idx;
// The spec states that the query values MUST be available: "When VK_QUERY_RESULT_WITH_AVAILABILITY_BIT is used,
// implementations must guarantee that if they return a non-zero availability value then the numerical results must
// be valid".
// In some cases Nvidia drivers can still return VK_NOT_READY here, so we have to use VK_QUERY_RESULT_WAIT_BIT.
auto status = vkGetQueryPoolResults( m_device, m_query, m_tail, cnt, sizeof( res ), res, sizeof( *res ), VK_QUERY_RESULT_64_BIT | VK_QUERY_RESULT_WAIT_BIT );
assert( status == VK_SUCCESS );
}
Magic magic;
auto& token = s_token.ptr;
auto& tail = token->get_tail_index();
unsigned int idx;
for( idx=0; idx<cnt; idx++ )
for( unsigned int idx=0; idx<cnt; idx++ )
{
if( res[idx] == 0 ) break;
@ -127,9 +149,9 @@ public:
tail.store( magic + 1, std::memory_order_release );
}
vkCmdResetQueryPool( cmdbuf, m_query, m_tail, idx );
vkCmdResetQueryPool( cmdbuf, m_query, m_tail, cnt );
m_tail += idx;
m_tail += cnt;
if( m_tail == QueryCount ) m_tail = 0;
}