From 2e2ede6334b5c817f08b71758c63ff6b3bc8c69c Mon Sep 17 00:00:00 2001
From: Alex Szpakowski <slime73@gmail.com>
Date: Mon, 23 Sep 2013 17:12:20 -0300
Subject: [PATCH] Calling ParticleSystem:setLinearAcceleration with no
 arguments now errors instead of defaulting to 0 (resolves issue #755)

---
 src/modules/graphics/opengl/wrap_ParticleSystem.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/modules/graphics/opengl/wrap_ParticleSystem.cpp b/src/modules/graphics/opengl/wrap_ParticleSystem.cpp
index 7618e8665..4cd983597 100644
--- a/src/modules/graphics/opengl/wrap_ParticleSystem.cpp
+++ b/src/modules/graphics/opengl/wrap_ParticleSystem.cpp
@@ -251,8 +251,8 @@ int w_ParticleSystem_getSpeed(lua_State *L)
 int w_ParticleSystem_setLinearAcceleration(lua_State *L)
 {
 	ParticleSystem *t = luax_checkparticlesystem(L, 1);
-	float xmin = (float) luaL_optnumber(L, 2, 0.0);
-	float ymin = (float) luaL_optnumber(L, 3, 0.0);
+	float xmin = (float) luaL_checknumber(L, 2);
+	float ymin = (float) luaL_checknumber(L, 3);
 	float xmax = (float) luaL_optnumber(L, 4, xmin);
 	float ymax = (float) luaL_optnumber(L, 5, ymin);
 	t->setLinearAcceleration(xmin, ymin, xmax, ymax);