From d3fe07c34d1792f997440ce85bd326c8cdf21c59 Mon Sep 17 00:00:00 2001
From: hasufell <hasufell@hasufell.de>
Date: Sat, 17 May 2014 17:24:29 +0200
Subject: [PATCH] Fix vsync

---
 src/gl_draw.c | 5 +++--
 src/gl_draw.h | 6 ++++++
 src/main.c    | 2 +-
 3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/gl_draw.c b/src/gl_draw.c
index 316bd4a..c5d3788 100644
--- a/src/gl_draw.c
+++ b/src/gl_draw.c
@@ -26,6 +26,7 @@
 
 #include "err.h"
 #include "filereader.h"
+#include "gl_draw.h"
 #include "half_edge.h"
 
 #include <GL/glut.h>
@@ -262,7 +263,7 @@ static void draw_Planet_1(void)
 	glColor3f(1.0f, 0.0f, 0.0f);
 
 	/* A rotation (full 360°) once a day is much
-	 * too fast you woulden'd see a thing */
+	 * too fast you wouldn't see a thing */
 	glRotatef((ROT_FACTOR_PLANET * day) / rot_fac_day, 0.0f, 0.0f, 1.0f);
 	glutWireSphere(1.0f, XY_WIRE_COUNT, XY_WIRE_COUNT);
 	glRotatef((ROT_FACTOR_PLANET * day) / rot_fac_day, 0.0f, 0.0f, -1.0f);
@@ -490,7 +491,7 @@ void animate()
 		day = 0;
 	}
 
-	usleep(30000); /* some very basic VScny to see the movement better */
+	glutTimerFunc(TIMERMSECS, animate, 0);
 	glutPostRedisplay();
 }
 
diff --git a/src/gl_draw.h b/src/gl_draw.h
index 2f08cc6..9e3d6b6 100644
--- a/src/gl_draw.h
+++ b/src/gl_draw.h
@@ -31,6 +31,12 @@
 #include <GL/glu.h>
 
 
+/**
+ * Vsync timer for animate() function
+ */
+#define TIMERMSECS 25
+
+
 void init(char const * const filename);
 void display(void);
 void reshape(GLsizei w, GLsizei h);
diff --git a/src/main.c b/src/main.c
index 46f7121..c80618e 100644
--- a/src/main.c
+++ b/src/main.c
@@ -73,7 +73,7 @@ int main(int argc, char *argv[])
 	glutKeyboardFunc(keyboard);
 	glutReshapeFunc(reshape);
 	glutDisplayFunc(display);
-	glutIdleFunc(animate);
+	glutTimerFunc(TIMERMSECS, animate, 0);
 	glutMainLoop();
 
 	return 0;