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Add config flag: SUPPORT_WINMM_HIGHRES_TIMER #1641

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Useful to avoid WinMM requirement and useful to avoid possible performance issues.
This commit is contained in:
Ray 2021-03-12 17:18:48 +01:00
parent 755ed388b2
commit 0872365938
2 changed files with 14 additions and 7 deletions
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3
src/config.h
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@ -40,6 +40,9 @@
#define SUPPORT_SSH_KEYBOARD_RPI 1
// Draw a mouse pointer on screen
#define SUPPORT_MOUSE_CURSOR_NATIVE 1
// Setting a higher resolution can improve the accuracy of time-out intervals in wait functions.
// However, it can also reduce overall system performance, because the thread scheduler switches tasks more often.
#define SUPPORT_WINMM_HIGHRES_TIMER 1
// Use busy wait loop for timing sync, if not defined, a high-resolution timer is setup and used
//#define SUPPORT_BUSY_WAIT_LOOP 1
// Use a half-busy wait loop, in this case frame sleeps for some time and runs a busy-wait-loop at the end

18
src/core.c
View file

@ -197,7 +197,7 @@
#define GLFW_EXPOSE_NATIVE_WIN32
#include "GLFW/glfw3native.h" // WARNING: It requires customization to avoid windows.h inclusion!
#if !defined(SUPPORT_BUSY_WAIT_LOOP)
#if defined(SUPPORT_WINMM_HIGHRES_TIMER) && !defined(SUPPORT_BUSY_WAIT_LOOP)
// NOTE: Those functions require linking with winmm library
unsigned int __stdcall timeBeginPeriod(unsigned int uPeriod);
unsigned int __stdcall timeEndPeriod(unsigned int uPeriod);
@ -575,7 +575,7 @@ static int FindNearestConnectorMode(const drmModeConnector *connector, uint widt
#endif // PLATFORM_RPI || PLATFORM_DRM
#if defined(_WIN32)
// NOTE: We include Sleep() function signature here to avoid windows.h inclusion
// NOTE: We include Sleep() function signature here to avoid windows.h inclusion (kernel32 lib)
void __stdcall Sleep(unsigned long msTimeout); // Required for Wait()
#endif
@ -819,7 +819,7 @@ void CloseWindow(void)
glfwTerminate();
#endif
#if !defined(SUPPORT_BUSY_WAIT_LOOP) && defined(_WIN32) && !defined(PLATFORM_UWP)
#if defined(_WIN32) && defined(SUPPORT_WINMM_HIGHRES_TIMER) && !defined(SUPPORT_BUSY_WAIT_LOOP) && !defined(PLATFORM_UWP)
timeEndPeriod(1); // Restore time period
#endif
@ -4204,10 +4204,14 @@ static void SetupFramebuffer(int width, int height)
// Initialize hi-resolution timer
static void InitTimer(void)
{
srand((unsigned int)time(NULL)); // Initialize random seed
srand((unsigned int)time(NULL)); // Initialize random seed
#if !defined(SUPPORT_BUSY_WAIT_LOOP) && defined(_WIN32) && !defined(PLATFORM_UWP)
timeBeginPeriod(1); // Setup high-resolution timer to 1ms (granularity of 1-2 ms)
// Setting a higher resolution can improve the accuracy of time-out intervals in wait functions.
// However, it can also reduce overall system performance, because the thread scheduler switches tasks more often.
// High resolutions can also prevent the CPU power management system from entering power-saving modes.
// Setting a higher resolution does not improve the accuracy of the high-resolution performance counter.
#if defined(_WIN32) && defined(SUPPORT_WINMM_HIGHRES_TIMER) && !defined(SUPPORT_BUSY_WAIT_LOOP) && !defined(PLATFORM_UWP)
timeBeginPeriod(1); // Setup high-resolution timer to 1ms (granularity of 1-2 ms)
#endif
#if defined(PLATFORM_ANDROID) || defined(PLATFORM_RPI) || defined(PLATFORM_DRM)
@ -4220,7 +4224,7 @@ static void InitTimer(void)
else TRACELOG(LOG_WARNING, "TIMER: Hi-resolution timer not available");
#endif
CORE.Time.previous = GetTime(); // Get time as double
CORE.Time.previous = GetTime(); // Get time as double
}
// Wait for some milliseconds (stop program execution)