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Make FPS counter more accurate

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While trying to figure a discrepancy between the FPS counter from the
overlay we've introduced in Mesa [1] and the counter in the Vulkan
demos, I figured the demos are not accounting for part of the
rendering loop but rather just the amount of time spent rendering.

This changes accounts for the total amount of time between 2 frames. I
don't think any difference is visible until you reach high frame rates
of 100s or so.

[1]: https://gitlab.freedesktop.org/mesa/mesa/merge_requests/303
This commit is contained in:
Lionel Landwerlin 2019-02-23 20:38:09 +00:00
parent cf83c1b499
commit 9db191f9a9
2 changed files with 12 additions and 12 deletions
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21
base/vulkanexamplebase.cpp
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@ -250,7 +250,7 @@ void VulkanExampleBase::renderFrame()
timer -= 1.0f;
}
}
fpsTimer += (float)tDiff;
float fpsTimer = std::chrono::duration<double, std::milli>(tEnd - lastTimestamp).count();
if (fpsTimer > 1000.0f)
{
lastFPS = static_cast<uint32_t>((float)frameCounter * (1000.0f / fpsTimer));
@ -260,8 +260,8 @@ void VulkanExampleBase::renderFrame()
SetWindowText(window, windowTitle.c_str());
}
#endif
fpsTimer = 0.0f;
frameCounter = 0;
lastTimestamp = tEnd;
}
// TODO: Cap UI overlay update rates
updateOverlay();
@ -280,6 +280,7 @@ void VulkanExampleBase::renderLoop()
destWidth = width;
destHeight = height;
lastTimestamp = std::chrono::high_resolution_clock::now();
#if defined(_WIN32)
MSG msg;
bool quitMessageReceived = false;
@ -347,12 +348,12 @@ void VulkanExampleBase::renderLoop()
timer -= 1.0f;
}
}
fpsTimer += (float)tDiff;
float fpsTimer = std::chrono::duration<double, std::milli>(tEnd - lastTimestamp).count();
if (fpsTimer > 1000.0f)
{
lastFPS = (float)frameCounter * (1000.0f / fpsTimer);
fpsTimer = 0.0f;
frameCounter = 0;
lastTimestamp = tEnd;
}
// TODO: Cap UI overlay update rates/only issue when update requested
@ -437,12 +438,12 @@ void VulkanExampleBase::renderLoop()
timer -= 1.0f;
}
}
fpsTimer += (float)tDiff;
float fpsTimer = std::chrono::duration<double, std::milli>(tEnd - lastTimestamp).count();
if (fpsTimer > 1000.0f)
{
lastFPS = (float)frameCounter * (1000.0f / fpsTimer);
fpsTimer = 0.0f;
frameCounter = 0;
lastTimestamp = tEnd;
}
updateOverlay();
}
@ -483,7 +484,7 @@ void VulkanExampleBase::renderLoop()
timer -= 1.0f;
}
}
fpsTimer += (float)tDiff;
float fpsTimer = std::chrono::duration<double, std::milli>(tEnd - lastTimestamp).count();
if (fpsTimer > 1000.0f)
{
if (!settings.overlay)
@ -492,8 +493,8 @@ void VulkanExampleBase::renderLoop()
xdg_toplevel_set_title(xdg_toplevel, windowTitle.c_str());
}
lastFPS = (float)frameCounter * (1000.0f / fpsTimer);
fpsTimer = 0.0f;
frameCounter = 0;
lastTimestamp = tEnd;
}
updateOverlay();
}
@ -532,7 +533,7 @@ void VulkanExampleBase::renderLoop()
timer -= 1.0f;
}
}
fpsTimer += (float)tDiff;
float fpsTimer = std::chrono::duration<double, std::milli>(tEnd - lastTimestamp).count();
if (fpsTimer > 1000.0f)
{
if (!settings.overlay)
@ -543,8 +544,8 @@ void VulkanExampleBase::renderLoop()
windowTitle.size(), windowTitle.c_str());
}
lastFPS = (float)frameCounter * (1000.0f / fpsTimer);
fpsTimer = 0.0f;
frameCounter = 0;
lastTimestamp = tEnd;
}
updateOverlay();
}