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add sapp_input_wait() to fix high cpu usage while idle #640

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add sapp_input_wait() to fix high cpu usage while idle #640

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13 changes: 11 additions & 2 deletions sokol_app.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1476,6 +1476,8 @@ SOKOL_APP_API_DECL void sapp_request_quit(void);
SOKOL_APP_API_DECL void sapp_cancel_quit(void);
/* initiate a "hard quit" (quit application without sending SAPP_EVENTTYPE_QUIT_REQUSTED) */
SOKOL_APP_API_DECL void sapp_quit(void);
/* this causes the app to block until input is received. the flag will be cleared after that, so you will have to call it again if necessary. */
SOKOL_APP_API_DECL void sapp_input_wait(void);
/* call from inside event callback to consume the current event (don't forward to platform) */
SOKOL_APP_API_DECL void sapp_consume_event(void);
/* get the current frame counter (for comparison with sapp_event.frame_count) */
Expand Down Expand Up @@ -2517,6 +2519,7 @@ typedef struct {
bool event_consumed;
bool html5_ask_leave_site;
bool onscreen_keyboard_shown;
bool input_wait;
int window_width;
int window_height;
int framebuffer_width;
Expand Down Expand Up @@ -11109,11 +11112,13 @@ _SOKOL_PRIVATE void _sapp_linux_run(const sapp_desc* desc) {
_sapp_timing_measure(&_sapp.timing);
_sapp_glx_make_current();
int count = XPending(_sapp.x11.display);
while (count--) {
if(count) while (count--) {
jmp:;
XEvent event;
XNextEvent(_sapp.x11.display, &event);
_sapp_x11_process_event(&event);
}
} else if(_sapp.input_wait) goto jmp;
_sapp.input_wait = false;
_sapp_frame();
_sapp_glx_swap_buffers();
XFlush(_sapp.x11.display);
Expand Down Expand Up @@ -11336,6 +11341,10 @@ SOKOL_API_IMPL void sapp_quit(void) {
_sapp.quit_ordered = true;
}

SOKOL_API_IMPL void sapp_input_wait(void) {
_sapp.input_wait = true;
}

SOKOL_API_IMPL void sapp_consume_event(void) {
_sapp.event_consumed = true;
}
Expand Down