From 57b545e51729d8d333d1b5a38cae7591162dbb58 Mon Sep 17 00:00:00 2001
From: Kayne Ruse <kayneruse@gmail.com>
Date: Thu, 16 Feb 2023 21:01:22 +0000
Subject: [PATCH] Changed to using clock_t for timing

---
 box/box_common.h | 18 +++++++++++++++---
 box/box_engine.c | 14 +++++++-------
 box/box_engine.h |  7 +++----
 3 files changed, 25 insertions(+), 14 deletions(-)

diff --git a/box/box_common.h b/box/box_common.h
index 6f1d339..2361a94 100644
--- a/box/box_common.h
+++ b/box/box_common.h
@@ -12,12 +12,24 @@
 #define BOX_VERSION_PATCH 0
 #define BOX_VERSION_BUILD __DATE__ " " __TIME__
 
-//platform exports/imports
-#if defined(__linux__)
+//platform/compiler-specific instructions
+#if defined(__linux__) || defined(__MINGW32__) || defined(__GNUC__)
+
+#include <unistd.h>
 #define BOX_API extern
 
+#elif defined(_MSC_VER)
+
+#include <windows.h>
+#ifndef BOX_EXPORT
+#define BOX_API __declspec(dllimport)
 #else
-#define BOX_API
+#define BOX_API __declspec(dllexport)
+#endif
+
+#else
+
+#define BOX_API extern
 
 #endif
 
diff --git a/box/box_engine.c b/box/box_engine.c
index 336c412..a9c81d6 100644
--- a/box/box_engine.c
+++ b/box/box_engine.c
@@ -336,29 +336,29 @@ void Box_execEngine() {
 	}
 
 	//set up time
-	gettimeofday(&engine.realTime, NULL);
+	engine.realTime = clock();
 	engine.simTime = engine.realTime;
-	struct timeval delta = { .tv_sec = 0, .tv_usec = 1000 * 1000 / 60 }; //60 frames per second
+	clock_t delta = (double) CLOCKS_PER_SEC / 60.0;
 
 	while (engine.running) {
 		execEvents();
 
 		//calc the time passed
-		gettimeofday(&engine.realTime, NULL);
+		engine.realTime = clock();
 
 		//if not enough time has passed
-		if (timercmp(&engine.simTime, &engine.realTime, <)) {
+		if (engine.simTime < engine.realTime) {
 			//while not enough time has passed
-			while(timercmp(&engine.simTime, &engine.realTime, <)) {
+			while(engine.simTime < engine.realTime) {
 				//simulate the world
 				execStep();
 
 				//calc the time simulation
-				timeradd(&delta, &engine.simTime, &engine.simTime);
+				engine.simTime += delta;
 			}
 		}
 		else {
-			SDL_Delay(10); //let the machine sleep, 10ms
+			sleep(0.01); //let the machine sleep, 10ms
 		}
 
 		//render the world
diff --git a/box/box_engine.h b/box/box_engine.h
index 6ed331b..06cec62 100644
--- a/box/box_engine.h
+++ b/box/box_engine.h
@@ -7,15 +7,14 @@
 #include "toy_literal_array.h"
 #include "toy_literal_dictionary.h"
 
-//TODO: remove this, and replace with time.h
-#include <sys/time.h>
+#include <time.h>
 
 //the base engine object, which represents the state of the game
 typedef struct Box_private_engine {
 	//engine stuff
 	Box_EngineNode* rootNode;
-	struct timeval simTime;
-	struct timeval realTime;
+	clock_t simTime;
+	clock_t realTime;
 	bool running;
 
 	//Toy stuff