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Convert the half sleep to a sleep that is a fraction of the target FPS (Default 95%) to reduce CPU use. (#1756)

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Co-authored-by: Jeffery Myers <JefMyers@blizzard.com>
This commit is contained in:
Jeffery Myers
2021-05-07 10:49:44 -07:00
committed by GitHub
parent b62c86572e
commit 133e6f097d
2 changed files with 13 additions and 8 deletions
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17
src/core.c
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@@ -62,8 +62,8 @@
* #define SUPPORT_BUSY_WAIT_LOOP
* Use busy wait loop for timing sync, if not defined, a high-resolution timer is setup and used
*
* #define SUPPORT_HALFBUSY_WAIT_LOOP
* Use a half-busy wait loop, in this case frame sleeps for some time and runs a busy-wait-loop at the end
* #define SUPPORT_PARTIALBUSY_WAIT_LOOP
* Use a partial-busy wait loop, in this case frame sleeps for most of the time and runs a busy-wait-loop at the end
*
* #define SUPPORT_EVENTS_WAITING
* Wait for events passively (sleeping while no events) instead of polling them actively every frame
@@ -4550,10 +4550,15 @@ static void Wait(float ms)
// Busy wait loop
while ((nextTime - prevTime) < ms/1000.0f) nextTime = GetTime();
#else
#if defined(SUPPORT_HALFBUSY_WAIT_LOOP)
#define MAX_HALFBUSY_WAIT_TIME 4
#if defined(SUPPORT_PARTIALBUSY_WAIT_LOOP)
#define DEFAULT_PARTIALBUSY_WAIT_TIME 4
#define PARTIALBUSY_WAIT_FACTOR 0.95f
float halfWait = DEFAULT_PARTIALBUSY_WAIT_TIME;
if (CORE.Time.target > 0)
halfWait = CORE.Time.target * PARTIALBUSY_WAIT_FACTOR;
double destTime = GetTime() + ms/1000;
if (ms > MAX_HALFBUSY_WAIT_TIME) ms -= MAX_HALFBUSY_WAIT_TIME;
if (ms > halfWait) ms -= halfWait;
#endif
#if defined(_WIN32)
@@ -4573,7 +4578,7 @@ static void Wait(float ms)
usleep(ms*1000.0f);
#endif
#if defined(SUPPORT_HALFBUSY_WAIT_LOOP)
#if defined(SUPPORT_PARTIALBUSY_WAIT_LOOP)
while (GetTime() < destTime) { }
#endif
#endif