From aa59033d28e2df8ce325c63fa8ca1728a71452a1 Mon Sep 17 00:00:00 2001
From: hasufell <hasufell@hasufell.de>
Date: Mon, 2 Jun 2014 00:13:15 +0200
Subject: [PATCH] Don't allow a negative ball speed

---
 src/gl_draw.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/gl_draw.c b/src/gl_draw.c
index e9cc352..2277f13 100644
--- a/src/gl_draw.c
+++ b/src/gl_draw.c
@@ -817,7 +817,8 @@ void keyboard(unsigned char key, int x, int y)
 		glutPostRedisplay();
 		break;
 	case 'K':
-		ball_speed -= 0.2f;
+		if (ball_speed - 0.2f > 0)
+			ball_speed -= 0.2f;
 		glutPostRedisplay();
 		break;
 	case 'f':