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Fix crash in Dota 2 on macOS < 10.15 - closes #2006

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This commit is contained in:
Dan Ginsburg 2023-08-31 09:13:26 -04:00
parent fd418aa7fe
commit 6acdd9fb91
1 changed files with 15 additions and 13 deletions
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28
MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm
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@ -1572,19 +1572,21 @@ VkResult MVKPhysicalDevice::getQueueFamilyProperties(uint32_t* pCount,
// On Apple GPUs, CPU & GPU timestamps are the same, and timestamp period never changes.
void MVKPhysicalDevice::updateTimestampsAndPeriod() {
if (_properties.vendorID == kAppleVendorId) { return; }
MTLTimestamp earlierCPUTs = _prevCPUTimestamp;
MTLTimestamp earlierGPUTs = _prevGPUTimestamp;
[_mtlDevice sampleTimestamps: &_prevCPUTimestamp gpuTimestamp: &_prevGPUTimestamp];
double elapsedCPUNanos = _prevCPUTimestamp - earlierCPUTs;
double elapsedGPUTicks = _prevGPUTimestamp - earlierGPUTs;
if (elapsedCPUNanos && elapsedGPUTicks) { // Ensure not zero
float tsPeriod = elapsedCPUNanos / elapsedGPUTicks;
// Basic lowpass filter Y = (1 - a)Y + a*X.
// The lower a is, the slower Y will change over time.
static const float a = 0.05;
_properties.limits.timestampPeriod = ((1.0 - a) * _properties.limits.timestampPeriod) + (a * tsPeriod);
if ([_mtlDevice respondsToSelector: @selector(sampleTimestamps:gpuTimestamp:)]) {
MTLTimestamp earlierCPUTs = _prevCPUTimestamp;
MTLTimestamp earlierGPUTs = _prevGPUTimestamp;
[_mtlDevice sampleTimestamps: &_prevCPUTimestamp gpuTimestamp: &_prevGPUTimestamp];
double elapsedCPUNanos = _prevCPUTimestamp - earlierCPUTs;
double elapsedGPUTicks = _prevGPUTimestamp - earlierGPUTs;
if (elapsedCPUNanos && elapsedGPUTicks) { // Ensure not zero
float tsPeriod = elapsedCPUNanos / elapsedGPUTicks;
// Basic lowpass filter Y = (1 - a)Y + a*X.
// The lower a is, the slower Y will change over time.
static const float a = 0.05;
_properties.limits.timestampPeriod = ((1.0 - a) * _properties.limits.timestampPeriod) + (a * tsPeriod);
}
}
}