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Limit the frame rate when minimized #1

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Limit the frame rate when minimized #1

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18 changes: 18 additions & 0 deletions OpenVR-SpaceCalibrator/OpenVR-SpaceCalibrator.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,9 @@
#include <GLFW/glfw3.h>
#include <openvr.h>
#include <direct.h>
#include <chrono>
#include <thread>


#pragma comment(linker,"\"/manifestdependency:type='win32' \
name='Microsoft.Windows.Common-Controls' version='6.0.0.0' \
Expand Down Expand Up @@ -57,6 +60,7 @@ static GLuint fboHandle = 0, fboTextureHandle = 0;
static int fboTextureWidth = 0, fboTextureHeight = 0;

static char cwd[MAX_PATH];
const float MINIMIZED_MAX_FPS = 60.0f;

void CreateGLFWWindow()
{
Expand Down Expand Up @@ -212,6 +216,7 @@ void RequestImmediateRedraw() {
immediateRedraw = true;
}

double lastFrameStartTime = glfwGetTime();
void RunLoop()
{
while (!glfwWindowShouldClose(glfwWindow))
Expand Down Expand Up @@ -369,6 +374,19 @@ void RunLoop()
}

glfwWaitEventsTimeout(waitEventsTimeout);

// If we're minimized rendering won't limit our frame rate so we need to do it ourselves.
if (glfwGetWindowAttrib(glfwWindow, GLFW_ICONIFIED))
{
double targetFrameTime = 1 / MINIMIZED_MAX_FPS;
double waitTime = targetFrameTime - (glfwGetTime() - lastFrameStartTime);
if (waitTime > 0)
{
std::this_thread::sleep_for(std::chrono::duration<double>(waitTime));
}

lastFrameStartTime += targetFrameTime;
}
}
}

Expand Down