From 877a8718f419efe6bfef4ba248741c1233e22a1d Mon Sep 17 00:00:00 2001
From: Thomas White <weiss@jade.(none)>
Date: Wed, 13 Aug 2008 12:40:53 +0100
Subject: Increase resolution of game timer

---
 src/game.c  |  1 -
 src/main.c  | 12 +++++++-----
 src/types.h |  8 ++++----
 src/utils.c | 16 ++++++++++++++++
 src/utils.h |  1 +
 5 files changed, 28 insertions(+), 10 deletions(-)

diff --git a/src/game.c b/src/game.c
index c77a3c6..dd309c5 100644
--- a/src/game.c
+++ b/src/game.c
@@ -289,7 +289,6 @@ Game *game_new(int width, int height, GameOptions gameopts) {
 	g->paused = 0;
 	g->pause_rel = 1;
 	g->frames = 0;
-	g->t_fps = SDL_GetTicks();
 	g->fps = 0;
 	g->query_this_frame = 1;
 	g->time_render = 30000;
diff --git a/src/main.c b/src/main.c
index 5bc4886..2624485 100644
--- a/src/main.c
+++ b/src/main.c
@@ -213,17 +213,19 @@ int main(int argc, char *argv[]) {
 	/* Main loop */
 	finished = 0;
 	game->time = 0.0;
-	game->tlast = SDL_GetTicks();
+	game->tlast = utils_highresms();
+	game->t_fps = game->tlast;
 	while ( !finished ) {
 	
 		int mx, my;
 		Uint8 buttons;
 		int mouse_thrust = 0;
-		int dt;
+		double us, dt;
 		
 		/* Tick size is measured, ... */
-		dt = SDL_GetTicks() - game->tlast;
-		game->tlast = SDL_GetTicks();
+		us = utils_highresms();
+		dt = us - game->tlast;
+		game->tlast = us;
 		/* ... but timer advances only when game is not paused */
 		if ( !game->paused ) {
 			game->time += dt;
@@ -280,7 +282,7 @@ int main(int argc, char *argv[]) {
 		if ( mouse_thrust ) game->thrusting = 0;
 		
 		if ( gameopts.status_line ) {
-			printf("%10lli %4i %+7.5f %+7.5f %+7.5f  %2i %2i %2i  %3i fps (r:%6lli p:%6lli)  \r",
+			printf("%+13.3f %+5.3f %+7.5f %+7.5f %+7.5f  %2i %2i %2i  %3i fps (r:%6lli p:%6lli)  \r",
 				game->time, dt,
 				game->lander->vx, game->lander->vy, game->lander->vz,
 				game->cur_room_x, game->cur_room_y, game->cur_room_z, game->fps,
diff --git a/src/types.h b/src/types.h
index a1a5358..c9a4b0c 100644
--- a/src/types.h
+++ b/src/types.h
@@ -240,9 +240,9 @@ typedef struct {
 	unsigned int forward;
 	unsigned int reverse;
 	
-	long long int tlast;
-	long long int time;			/* Time in the game (milliseconds since start of game
-						 * as measured at the start of the current frame */
+	double tlast;
+	double time;			/* Time in the game (milliseconds since start of game
+					/ * as measured at the start of the current frame */
 	
 	ModelInstance *lander;
 	
@@ -265,7 +265,7 @@ typedef struct {
 	
 	/* Performance monitoring stuff */
 	int		frames;
-	Uint32		t_fps;
+	double		t_fps;
 	int		fps;
 	int		query_this_frame;
 	GLuint		timer_query;
diff --git a/src/utils.c b/src/utils.c
index f9ac11a..e957f2a 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -15,6 +15,8 @@
 
 #include <string.h>
 #include <stdlib.h>
+#include <sys/time.h>
+#include <time.h>
 
 #include "utils.h"
 
@@ -111,3 +113,17 @@ int assplode(const char *a, const char *delims, char ***pbits, AssplodeFlag flag
 
 }
 
+double utils_highresms() {
+
+	struct timeval tv;
+	suseconds_t us;
+	time_t sec;
+	
+	gettimeofday(&tv, NULL);
+	us = tv.tv_usec;
+	sec = tv.tv_sec;
+	
+	return ((double)us+1000000.0*sec)/1000.0;
+
+}
+
diff --git a/src/utils.h b/src/utils.h
index 2ec62df..d25dc3c 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -28,6 +28,7 @@ typedef enum {
 
 extern void chomp(char *a);
 extern int assplode(const char *a, const char *delims, char ***pbits, AssplodeFlag flags);
+extern double utils_highresms(void);
 
 /* So you can do assert(this_point_not_reached) */
 extern int this_point_not_reached;
-- 
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