From 8b8be85dea5f3474dee1080b42714ae307d99864 Mon Sep 17 00:00:00 2001
From: n00b <n00bskillz87@gmail.com>
Date: Fri, 20 Dec 2024 17:04:40 -0500
Subject: [PATCH] Implemented VSync timer using SDL

---
 rcbasic_runtime/rc_gfx.h         | 12 +++++++++++-
 rcbasic_runtime/rc_gfx_core.h    |  3 +++
 rcbasic_runtime/rc_os_defines.h  |  2 +-
 rcbasic_runtime/rc_windowclose.h |  7 +++++++
 4 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/rcbasic_runtime/rc_gfx.h b/rcbasic_runtime/rc_gfx.h
index f6b061f..0b79530 100644
--- a/rcbasic_runtime/rc_gfx.h
+++ b/rcbasic_runtime/rc_gfx.h
@@ -308,12 +308,22 @@ bool rc_windowOpenEx(std::string title, int x, int y, int w, int h, uint32_t win
     irr_creation_params.Bits = 16;
     irr_creation_params.Fullscreen = fullscreen;
     irr_creation_params.Stencilbuffer = stencil_buffer;
-    irr_creation_params.Vsync = vsync;
+    irr_creation_params.Vsync = false;
     irr_creation_params.EventReceiver = 0;
     irr_creation_params.WindowPosition = position2d<s32>(x, y);
     irr_creation_params.AntiAlias = AntiAlias;
     irr_creation_params.OGLES2ShaderPath = ".shaders/";
 
+    rc_window_vsync = vsync;
+
+    if(vsync)
+	{
+		SDL_DisplayMode dm;
+		SDL_GetDesktopDisplayMode(0, &dm);
+		rc_vsync_refresh_rate = dm.refresh_rate;
+		rc_vsync_timer = SDL_GetTicks();
+	}
+
 	device = createDeviceEx(irr_creation_params);
 
 
diff --git a/rcbasic_runtime/rc_gfx_core.h b/rcbasic_runtime/rc_gfx_core.h
index 152f81c..841bd51 100644
--- a/rcbasic_runtime/rc_gfx_core.h
+++ b/rcbasic_runtime/rc_gfx_core.h
@@ -255,6 +255,9 @@ bool rc_mouse_zone_active = false;
 double rc_window_zone_scale_x = 1;
 double rc_window_zone_scale_y = 1;
 SDL_Rect rc_mouse_zone;
+bool rc_window_vsync = false;
+int rc_vsync_refresh_rate = 0;
+Uint32 rc_vsync_timer = 0;
 
 struct rc_scene_properties_obj
 {
diff --git a/rcbasic_runtime/rc_os_defines.h b/rcbasic_runtime/rc_os_defines.h
index 093fff9..c28846f 100755
--- a/rcbasic_runtime/rc_os_defines.h
+++ b/rcbasic_runtime/rc_os_defines.h
@@ -2,7 +2,7 @@
 #define RC_OS_DEFINES_H_INCLUDED
 
 //USED FOR TESTING ONLY
-//#define RC_TESTING
+#define RC_TESTING
 
 //I am checking Android first since I think it also defines __linux__
 
diff --git a/rcbasic_runtime/rc_windowclose.h b/rcbasic_runtime/rc_windowclose.h
index 8dfcedd..07c8c71 100644
--- a/rcbasic_runtime/rc_windowclose.h
+++ b/rcbasic_runtime/rc_windowclose.h
@@ -79,6 +79,13 @@ void rc_preUpdate()
 
 bool rc_update()
 {
+	if(rc_window_vsync)
+	{
+		int frame_delay = 1000/rc_vsync_refresh_rate;
+		while( (SDL_GetTicks()-rc_vsync_timer) < frame_delay ){}
+		rc_vsync_timer = SDL_GetTicks();
+	}
+
     if(!device->run())
         return false;