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Linux: Only process global state when something interesting happens

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This matches behavior on macOS. Had initially set the code to process
on every loop tick in an attmept to workaround the issue of the event
loop freezing on X11 until an X event is delivered. However, in light
of #1782 that workaround was incorrect anyway. Better to have similar
behavior across platforms. This also has the advantage of reducing CPU
consumption.

Also add a simple program to test event loop wakeups.
This commit is contained in:
Kovid Goyal
2019-07-15 21:29:51 +05:30
parent 63573d6e26
commit 8244f7cd58
6 changed files with 161 additions and 16 deletions
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25
glfw/main_loop.h vendored
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@@ -12,9 +12,11 @@
#define GLFW_LOOP_BACKEND x11
#endif
static bool keep_going = false;
static bool keep_going = false, tick_callback_requested = false;
void _glfwPlatformRequestTickCallback() {
EVDBG("tick_callback requested");
tick_callback_requested = true;
}
void _glfwPlatformStopMainLoop(void) {
@@ -24,15 +26,26 @@ void _glfwPlatformStopMainLoop(void) {
}
}
void _glfwPlatformRunMainLoop(GLFWtickcallback tick_callback, void* data) {
keep_going = true;
while(keep_going) {
_glfwPlatformWaitEvents();
EVDBG("loop tick");
static inline void
dispatch_tick_callbacks(GLFWtickcallback tick_callback, void *data) {
while (tick_callback_requested) {
EVDBG("Calling tick callback");
tick_callback_requested = false;
tick_callback(data);
}
}
void _glfwPlatformRunMainLoop(GLFWtickcallback tick_callback, void* data) {
keep_going = true;
tick_callback_requested = false;
while(keep_going) {
EVDBG("loop tick, tick_callback_requested: %d", tick_callback_requested);
dispatch_tick_callbacks(tick_callback, data);
_glfwPlatformWaitEvents();
}
EVDBG("main loop exiting");
}
unsigned long long _glfwPlatformAddTimer(double interval, bool repeats, GLFWuserdatafreefun callback, void *callback_data, GLFWuserdatafreefun free_callback) {
return addTimer(&_glfw.GLFW_LOOP_BACKEND.eventLoopData, "user timer", interval, 1, repeats, callback, callback_data, free_callback);
}