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Calculate frame-rate for the user, as a purely luxurious feature

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..and to reduce sample code size a little.
This commit is contained in:
ocornut 2015-02-11 18:28:17 +00:00
parent d65e051a07
commit cb0a4db048
6 changed files with 16 additions and 44 deletions
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12
examples/directx11_example/main.cpp
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@ -568,17 +568,7 @@ int WINAPI wWinMain(HINSTANCE hInst, HINSTANCE, LPWSTR, int)
ImGui::ColorEdit3("clear color", (float*)&clear_col);
if (ImGui::Button("Test Window")) show_test_window ^= 1;
if (ImGui::Button("Another Window")) show_another_window ^= 1;
// Calculate and show frame rate
static int ms_per_frame_idx = 0;
static float ms_per_frame[60] = { 0 };
static float ms_per_frame_accum = 0.0f;
ms_per_frame_accum -= ms_per_frame[ms_per_frame_idx];
ms_per_frame[ms_per_frame_idx] = ImGui::GetIO().DeltaTime * 1000.0f;
ms_per_frame_accum += ms_per_frame[ms_per_frame_idx];
ms_per_frame_idx = (ms_per_frame_idx + 1) % 60;
const float ms_per_frame_avg = ms_per_frame_accum / 60;
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", ms_per_frame_avg, 1000.0f / ms_per_frame_avg);
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
}
// 2. Show another simple window, this time using an explicit Begin/End pair

12
examples/directx9_example/main.cpp
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@ -334,17 +334,7 @@ int WINAPI wWinMain(HINSTANCE hInst, HINSTANCE, LPWSTR, int)
ImGui::ColorEdit3("clear color", (float*)&clear_col);
if (ImGui::Button("Test Window")) show_test_window ^= 1;
if (ImGui::Button("Another Window")) show_another_window ^= 1;
// Calculate and show frame rate
static int ms_per_frame_idx = 0;
static float ms_per_frame[60] = { 0 };
static float ms_per_frame_accum = 0.0f;
ms_per_frame_accum -= ms_per_frame[ms_per_frame_idx];
ms_per_frame[ms_per_frame_idx] = ImGui::GetIO().DeltaTime * 1000.0f;
ms_per_frame_accum += ms_per_frame[ms_per_frame_idx];
ms_per_frame_idx = (ms_per_frame_idx + 1) % 60;
const float ms_per_frame_avg = ms_per_frame_accum / 60;
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", ms_per_frame_avg, 1000.0f / ms_per_frame_avg);
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
}
// 2. Show another simple window, this time using an explicit Begin/End pair

12
examples/opengl3_example/main.cpp
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@ -346,17 +346,7 @@ int main(int argc, char** argv)
ImGui::ColorEdit3("clear color", (float*)&clear_col);
if (ImGui::Button("Test Window")) show_test_window ^= 1;
if (ImGui::Button("Another Window")) show_another_window ^= 1;
// Calculate and show frame rate
static int ms_per_frame_idx = 0;
static float ms_per_frame[60] = { 0 };
static float ms_per_frame_accum = 0.0f;
ms_per_frame_accum -= ms_per_frame[ms_per_frame_idx];
ms_per_frame[ms_per_frame_idx] = ImGui::GetIO().DeltaTime * 1000.0f;
ms_per_frame_accum += ms_per_frame[ms_per_frame_idx];
ms_per_frame_idx = (ms_per_frame_idx + 1) % 60;
const float ms_per_frame_avg = ms_per_frame_accum / 60;
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", ms_per_frame_avg, 1000.0f / ms_per_frame_avg);
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
}
// 2. Show another simple window, this time using an explicit Begin/End pair

12
examples/opengl_example/main.cpp
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@ -255,17 +255,7 @@ int main(int argc, char** argv)
ImGui::ColorEdit3("clear color", (float*)&clear_col);
if (ImGui::Button("Test Window")) show_test_window ^= 1;
if (ImGui::Button("Another Window")) show_another_window ^= 1;
// Calculate and show frame rate
static int ms_per_frame_idx = 0;
static float ms_per_frame[60] = { 0 };
static float ms_per_frame_accum = 0.0f;
ms_per_frame_accum -= ms_per_frame[ms_per_frame_idx];
ms_per_frame[ms_per_frame_idx] = ImGui::GetIO().DeltaTime * 1000.0f;
ms_per_frame_accum += ms_per_frame[ms_per_frame_idx];
ms_per_frame_idx = (ms_per_frame_idx + 1) % 60;
const float ms_per_frame_avg = ms_per_frame_accum / 60;
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", ms_per_frame_avg, 1000.0f / ms_per_frame_avg);
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
}
// 2. Show another simple window, this time using an explicit Begin/End pair

11
imgui.cpp
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@ -1022,6 +1022,11 @@ struct ImGuiState
int LogStartDepth;
int LogAutoExpandMaxDepth;
// Misc
float FramerateSecPerFrame[120]; // calculate estimate of framerate for user
int FramerateSecPerFrameIdx;
float FramerateSecPerFrameAccum;
ImGuiState()
{
Initialized = false;
@ -1719,6 +1724,12 @@ void ImGui::NewFrame()
for (size_t i = 0; i < IM_ARRAYSIZE(g.IO.KeysDown); i++)
g.IO.KeysDownTime[i] = g.IO.KeysDown[i] ? (g.IO.KeysDownTime[i] < 0.0f ? 0.0f : g.IO.KeysDownTime[i] + g.IO.DeltaTime) : -1.0f;
// Calculate frame-rate for the user, as a purely luxurious feature
g.FramerateSecPerFrameAccum += g.IO.DeltaTime - g.FramerateSecPerFrame[g.FramerateSecPerFrameIdx];
g.FramerateSecPerFrame[g.FramerateSecPerFrameIdx] = g.IO.DeltaTime;
g.FramerateSecPerFrameIdx = (g.FramerateSecPerFrameIdx + 1) % IM_ARRAYSIZE(g.FramerateSecPerFrame);
g.IO.Framerate = 1.0f / (g.FramerateSecPerFrameAccum / (float)IM_ARRAYSIZE(g.FramerateSecPerFrame));
// Clear reference to active widget if the widget isn't alive anymore
g.HoveredId = 0;
if (!g.ActiveIdIsAlive && g.ActiveIdPreviousFrame == g.ActiveId && g.ActiveId != 0)

1
imgui.h
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@ -589,6 +589,7 @@ struct ImGuiIO
bool WantCaptureMouse; // Mouse is hovering a window or widget is active (= ImGui will use your mouse input)
bool WantCaptureKeyboard; // Widget is active (= ImGui will use your keyboard input)
float Framerate; // Framerate estimation, in frame per second. Rolling average estimation based on IO.DeltaTime over 120 frames
//------------------------------------------------------------------
// [Internal] ImGui will maintain those fields for you