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[SofaGLFW] Add FPS in the title bar #273

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Merged
hugtalbot merged 3 commits into from
Feb 25, 2026
Merged

[SofaGLFW] Add FPS in the title bar #273

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6f4d582
use the alias for nfd only if it exists
fredroy Feb 13, 2026
31ee595
add fps in title bar
fredroy Dec 19, 2022
f85897f
improvment by claude for a smooth display
fredroy Feb 13, 2026
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33 changes: 28 additions & 5 deletions SofaGLFW/src/SofaGLFW/NullGUIEngine.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -29,19 +29,42 @@ namespace sofaglfw

void NullGUIEngine::init()
{

m_lastTime = glfwGetTime();
m_lastDisplayTime = m_lastTime;
m_avgFrameTime = 0.0;
}
void NullGUIEngine::initBackend(GLFWwindow*)
void NullGUIEngine::initBackend(GLFWwindow* window)
{

m_window = window;
}
void NullGUIEngine::startFrame(SofaGLFWBaseGUI*)
{

}
void NullGUIEngine::endFrame()
{

constexpr double displayRefreshInterval = 0.1;
constexpr double smoothingFactor = 0.05;

const double now = glfwGetTime();
const double dt = now - m_lastTime;
m_lastTime = now;

if (dt > 0.0)
{
if (m_avgFrameTime <= 0.0)
m_avgFrameTime = dt;
else
m_avgFrameTime += smoothingFactor * (dt - m_avgFrameTime);
}

if (now - m_lastDisplayTime >= displayRefreshInterval)
{
const double fps = (m_avgFrameTime > 0.0) ? 1.0 / m_avgFrameTime : 0.0;
char title_string[32];
std::snprintf(title_string, sizeof(title_string), "FPS: %.1f", fps);
glfwSetWindowTitle(m_window, title_string);
m_lastDisplayTime = now;
}
}

void NullGUIEngine::beforeDraw(GLFWwindow* window)
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5 changes: 5 additions & 0 deletions SofaGLFW/src/SofaGLFW/NullGUIEngine.h
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Expand Up @@ -44,6 +44,11 @@ class NullGUIEngine : public BaseGUIEngine
bool dispatchMouseEvents() override;
void resetCounter() override;
sofa::type::Vec2i getFrameBufferPixels(std::vector<uint8_t>& pixels) override;
private:
GLFWwindow* m_window{ nullptr };
double m_lastTime{ 0.0 };
double m_lastDisplayTime{ 0.0 };
double m_avgFrameTime{ 0.0 };
};

} // namespace sofaglfw
6 changes: 5 additions & 1 deletion SofaImGui/CMakeLists.txt
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Expand Up @@ -150,8 +150,12 @@ set(IMGUI_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/resources ${imgui_SOURCE_DIR} $
add_library(${PROJECT_NAME} SHARED ${HEADER_FILES} ${SOURCE_FILES} ${IMGUI_SOURCE_FILES})
target_include_directories(${PROJECT_NAME} PUBLIC "$<BUILD_INTERFACE:${IMGUI_SOURCE_DIR}>")
target_link_libraries(${PROJECT_NAME} PUBLIC SofaGLFW Sofa.GL.Component.Rendering3D ${CMAKE_DL_LIBS})
target_link_libraries(${PROJECT_NAME} PRIVATE nfd)
target_link_libraries(${PROJECT_NAME} PRIVATE SimpleIni::SimpleIni)
if (EXISTS nfd)
target_link_libraries(${PROJECT_NAME} PRIVATE nfd)
else()
target_link_libraries(${PROJECT_NAME} PRIVATE nfd::nfd)
endif()

# setup the same API exports for imgui
target_compile_definitions(${PROJECT_NAME} PUBLIC IMGUI_API=SOFAIMGUI_API)
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