# HG changeset patch
# User Michael Pavone <pavone@retrodev.com>
# Date 1511649758 28800
# Node ID 2d203bf73dbd6190b5e0989923f0a93a82797b96
# Parent  77a401044935d46a9931448a5c750ba34ef95532
Avoid burning a huge amount of CPU in the menu when emulation is not running and vsync is disabled

diff -r 77a401044935 -r 2d203bf73dbd nuklear_ui/blastem_nuklear.c
--- a/nuklear_ui/blastem_nuklear.c	Sat Nov 25 13:57:38 2017 -0800
+++ b/nuklear_ui/blastem_nuklear.c	Sat Nov 25 14:42:38 2017 -0800
@@ -206,8 +206,15 @@
 
 void idle_loop(void)
 {
+	const uint32_t MIN_UI_DELAY = 15;
+	static uint32_t last;
 	while (current_view != view_play)
 	{
+		uint32_t current = render_elapsed_ms();
+		if ((current - last) < MIN_UI_DELAY) {
+			render_sleep_ms(MIN_UI_DELAY - (current - last) - 1);
+		}
+		last = current;
 		render_update_display();
 	}
 }
diff -r 77a401044935 -r 2d203bf73dbd render.h
--- a/render.h	Sat Nov 25 13:57:38 2017 -0800
+++ b/render.h	Sat Nov 25 14:42:38 2017 -0800
@@ -103,6 +103,8 @@
 uint32_t render_emulated_height();
 uint32_t render_overscan_top();
 uint32_t render_overscan_left();
+uint32_t render_elapsed_ms(void);
+void render_sleep_ms(uint32_t delay);
 
 #endif //RENDER_H_
 
diff -r 77a401044935 -r 2d203bf73dbd render_sdl.c
--- a/render_sdl.c	Sat Nov 25 13:57:38 2017 -0800
+++ b/render_sdl.c	Sat Nov 25 14:42:38 2017 -0800
@@ -1220,3 +1220,13 @@
 	SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, title, message, NULL);
 }
 
+uint32_t render_elapsed_ms(void)
+{
+	return SDL_GetTicks();
+}
+
+void render_sleep_ms(uint32_t delay)
+{
+	return SDL_Delay(delay);
+}
+