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power saving mode which only renders upon event happening

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This commit is contained in:
SergeyN 2025-11-24 23:45:04 +01:00
parent a726bded11
commit 4f978fd312
7 changed files with 295 additions and 28 deletions
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45
examples/example_win32_directx12/main.cpp
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@ -12,6 +12,8 @@
#include <d3d12.h>
#include <dxgi1_5.h>
#include <tchar.h>
#include <cstdio>
#include <string>
#ifdef _DEBUG
#define DX12_ENABLE_DEBUG_LAYER
@ -186,6 +188,9 @@ int main(int, char**)
bool show_demo_window = true;
bool show_another_window = false;
ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
LARGE_INTEGER last_frame_time, timer_freq;
QueryPerformanceFrequency(&timer_freq);
QueryPerformanceCounter(&last_frame_time);
// Main loop
bool done = false;
@ -193,6 +198,7 @@ int main(int, char**)
{
// Poll and handle messages (inputs, window resize, etc.)
// See the WndProc() function below for our to dispatch events to the Win32 backend.
#if 0
MSG msg;
while (::PeekMessage(&msg, nullptr, 0U, 0U, PM_REMOVE))
{
@ -201,6 +207,8 @@ int main(int, char**)
if (msg.message == WM_QUIT)
done = true;
}
#endif
if (done)
break;
@ -213,8 +221,17 @@ int main(int, char**)
g_SwapChainOccluded = false;
// Start the Dear ImGui frame
if (!ImGui_ImplWin32_NewFrame())
break;
LARGE_INTEGER t0; QueryPerformanceCounter(&t0);
auto refresh_reason = io.NextRefreshStack.Entries[0];// double refresh_delay = io.NextRefresh >= FLT_MAX ? 99.99f : io.NextRefresh;
ImGui_ImplDX12_NewFrame();
ImGui_ImplWin32_NewFrame();
LARGE_INTEGER t1; QueryPerformanceCounter(&t1);
ImGui::NewFrame();
// 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
@ -254,6 +271,8 @@ int main(int, char**)
ImGui::End();
}
LARGE_INTEGER t2; QueryPerformanceCounter(&t2);
// Rendering
ImGui::Render();
@ -286,10 +305,32 @@ int main(int, char**)
g_pd3dCommandQueue->Signal(g_fence, ++g_fenceLastSignaledValue);
frameCtx->FenceValue = g_fenceLastSignaledValue;
LARGE_INTEGER t3; QueryPerformanceCounter(&t3);
// Present
HRESULT hr = g_pSwapChain->Present(1, 0); // Present with vsync
//HRESULT hr = g_pSwapChain->Present(0, g_SwapChainTearingSupport ? DXGI_PRESENT_ALLOW_TEARING : 0); // Present without vsync
g_SwapChainOccluded = (hr == DXGI_STATUS_OCCLUDED);
LARGE_INTEGER t4; QueryPerformanceCounter(&t4);
double layout_time = double(t2.QuadPart-t1.QuadPart)/timer_freq.QuadPart;
double render_time = double((t1.QuadPart-t0.QuadPart) + (t3.QuadPart-t2.QuadPart)) / timer_freq.QuadPart;
double present_time = double(t4.QuadPart - t3.QuadPart) / timer_freq.QuadPart;
double sleep_time = double(t0.QuadPart - last_frame_time.QuadPart) / timer_freq.QuadPart;
printf("ImGui #%i(%+6.3fs %ims(I%ims,R%ims,P%ims)), reason: %s (%0.2fs) ... %s", g_frameIndex, sleep_time, (int)round((layout_time + render_time)*1000.0), (int)round(layout_time * 1000.0), (int)round(render_time * 1000.0), (int)round(present_time * 1000.0), refresh_reason.reason, refresh_reason.delay, io.NextRefreshStack.Size ? "" : "\n");
if (io.NextRefreshStack.Size)
{
printf(" refresh stack:");
for (int i = 0; i < io.NextRefreshStack.Size; ++i)
printf("%c%s(+%0.2fs)", i == 0 ? ' ' : ',' ,io.NextRefreshStack.Entries[i].reason, io.NextRefreshStack.Entries[i].delay);
printf("\n");
}
last_frame_time = t3;
g_frameIndex++;
}
@ -438,7 +479,7 @@ bool CreateDeviceD3D(HWND hWnd)
swapChain1->Release();
dxgiFactory->Release();
g_pSwapChain->SetMaximumFrameLatency(APP_NUM_BACK_BUFFERS);
g_pSwapChain->SetMaximumFrameLatency(/*NUM_BACK_BUFFERS*/1);
g_hSwapChainWaitableObject = g_pSwapChain->GetFrameLatencyWaitableObject();
}