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macOS: Reduce energy consumption when idle by shutting down Apple's display link thread after 30 second of inactivity

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Fixes #1763
This commit is contained in:
Kovid Goyal
2019-06-29 14:21:47 +05:30
parent c84e73d8e6
commit 8c9d2d3ca2
3 changed files with 22 additions and 0 deletions
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1
glfw/cocoa_platform.h vendored
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@@ -229,3 +229,4 @@ void _glfwRestartDisplayLinks(void);
void _glfwCocoaPostEmptyEvent(short subtype, long data1, bool at_start);
void _glfwDispatchTickCallback(void);
void _glfwDispatchRenderFrame(CGDirectDisplayID);
void _glfwShutdownCVDisplayLink(unsigned long long, void*);

18
glfw/cocoa_window.m
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@@ -62,6 +62,19 @@ CGDirectDisplayID displayIDForWindow(_GLFWwindow *w) {
return (CGDirectDisplayID)-1;
}
static unsigned long long display_link_shutdown_timer = 0;
#define DISPLAY_LINK_SHUTDOWN_CHECK_INTERVAL 30
void
_glfwShutdownCVDisplayLink(unsigned long long timer_id, void *user_data) {
[_glfw.ns.displayLinks.lock lock];
display_link_shutdown_timer = 0;
for (size_t i = 0; i < _glfw.ns.displayLinks.count; i++) {
_GLFWDisplayLinkNS *dl = &_glfw.ns.displayLinks.entries[i];
if (dl->displayLink) CVDisplayLinkStop(dl->displayLink);
}
[_glfw.ns.displayLinks.lock unlock];
}
static inline void
requestRenderFrame(_GLFWwindow *w, GLFWcocoarenderframefun callback) {
@@ -74,6 +87,11 @@ requestRenderFrame(_GLFWwindow *w, GLFWcocoarenderframefun callback) {
w->ns.renderFrameRequested = true;
CGDirectDisplayID displayID = displayIDForWindow(w);
[_glfw.ns.displayLinks.lock lock];
if (display_link_shutdown_timer) {
_glfwPlatformUpdateTimer(display_link_shutdown_timer, DISPLAY_LINK_SHUTDOWN_CHECK_INTERVAL, true);
} else {
display_link_shutdown_timer = _glfwPlatformAddTimer(DISPLAY_LINK_SHUTDOWN_CHECK_INTERVAL, false, _glfwShutdownCVDisplayLink, NULL, NULL);
}
for (size_t i = 0; i < _glfw.ns.displayLinks.count; i++) {
_GLFWDisplayLinkNS *dl = &_glfw.ns.displayLinks.entries[i];
if (dl->displayID == displayID) {