diff --git a/src/Core.h b/src/Core.h
index ff320b9a2..fa51bc00f 100644
--- a/src/Core.h
+++ b/src/Core.h
@@ -378,6 +378,7 @@ typedef cc_uint8  cc_bool;
 	#define CC_BUILD_NOMUSIC
 	#define CC_BUILD_NOSOUNDS
 	#define CC_BUILD_SMALLSTACK
+	#define CC_BUILD_SPLITSCREEN
 	#undef  CC_BUILD_RESOURCES
 	#undef  CC_BUILD_NETWORKING
 	#undef  CC_BUILD_FILESYSTEM
diff --git a/src/ExtMath.h b/src/ExtMath.h
index 2d4ecdb1b..bfe31e763 100644
--- a/src/ExtMath.h
+++ b/src/ExtMath.h
@@ -34,6 +34,11 @@ CC_BEGIN_HEADER
 float Math_Mod1(float x);
 int   Math_AbsI(int x);
 
+static CC_INLINE float Math_SafeDiv(float a, float b) {
+	if (Math_AbsF(b) < 0.000001f) return MATH_LARGENUM;
+	return a / b;
+}
+
 CC_API double Math_Sin(double x);
 CC_API double Math_Cos(double x);
 CC_API float Math_SinF(float x);
diff --git a/src/Graphics_N64.c b/src/Graphics_N64.c
index 9d34f3772..f4c994b20 100644
--- a/src/Graphics_N64.c
+++ b/src/Graphics_N64.c
@@ -72,8 +72,15 @@ void Gfx_SetVSync(cc_bool vsync) {
 
 void Gfx_OnWindowResize(void) { }
 
-void Gfx_SetViewport(int x, int y, int w, int h) { }
-void Gfx_SetScissor (int x, int y, int w, int h) { }
+void Gfx_SetViewport(int x, int y, int w, int h) {
+	glViewport(x, Game.Height - h - y, w, h);
+}
+void Gfx_SetScissor (int x, int y, int w, int h) {
+	cc_bool enabled = x != 0 || y != 0 || w != Game.Width || h != Game.Height;
+	if (enabled) { glEnable(GL_SCISSOR_TEST); } else { glDisable(GL_SCISSOR_TEST); }
+
+	glScissor(x, Game.Height - h - y, w, h);
+}
 
 
 void Gfx_BeginFrame(void) {
diff --git a/src/Physics.c b/src/Physics.c
index 96dccfca4..a377eb4e6 100644
--- a/src/Physics.c
+++ b/src/Physics.c
@@ -76,9 +76,9 @@ cc_bool Intersection_RayIntersectsRotatedBox(Vec3 origin, Vec3 dir, struct Entit
 	dir = Intersection_InverseRotate(dir, target);
 	Entity_GetPickingBounds(target, &bb);
 
-	invDir.x = 1.0f / dir.x;
-	invDir.y = 1.0f / dir.y;
-	invDir.z = 1.0f / dir.z;
+	invDir.x = Math_SafeDiv(1.0f, dir.x);
+	invDir.y = Math_SafeDiv(1.0f, dir.y);
+	invDir.z = Math_SafeDiv(1.0f, dir.z);
 	return Intersection_RayIntersectsBox(origin, invDir, bb.Min, bb.Max, tMin, tMax);
 }
 
diff --git a/src/Picking.c b/src/Picking.c
index b2e1b8817..f492e701a 100644
--- a/src/Picking.c
+++ b/src/Picking.c
@@ -50,18 +50,13 @@ void RayTracer_SetInvalid(struct RayTracer* t) {
 	t->closest = FACE_COUNT;
 }
 
-static float RayTracer_Div(float a, float b) {
-	if (Math_AbsF(b) < 0.000001f) return MATH_LARGENUM;
-	return a / b;
-}
-
 void RayTracer_Init(struct RayTracer* t, const Vec3* origin, const Vec3* dir) {
 	IVec3 cellBoundary;
 	t->origin = *origin; t->dir = *dir;
 
-	t->invDir.x = RayTracer_Div(1.0f, dir->x);
-	t->invDir.y = RayTracer_Div(1.0f, dir->y);
-	t->invDir.z = RayTracer_Div(1.0f, dir->z);
+	t->invDir.x = Math_SafeDiv(1.0f, dir->x);
+	t->invDir.y = Math_SafeDiv(1.0f, dir->y);
+	t->invDir.z = Math_SafeDiv(1.0f, dir->z);
 
 	/* Rounds the position's X, Y and Z down to the nearest integer values. */
 	/* The cell in which the ray starts. */
@@ -78,9 +73,9 @@ void RayTracer_Init(struct RayTracer* t, const Vec3* origin, const Vec3* dir) {
 
 	/* NOTE: we want it so if dir.x = 0, tmax.x = positive infinity
 	Determine how far we can travel along the ray before we hit a voxel boundary. */
-	t->tMax.x = RayTracer_Div(cellBoundary.x - origin->x, dir->x); /* Boundary is a plane on the YZ axis. */
-	t->tMax.y = RayTracer_Div(cellBoundary.y - origin->y, dir->y); /* Boundary is a plane on the XZ axis. */
-	t->tMax.z = RayTracer_Div(cellBoundary.z - origin->z, dir->z); /* Boundary is a plane on the XY axis. */
+	t->tMax.x = Math_SafeDiv(cellBoundary.x - origin->x, dir->x); /* Boundary is a plane on the YZ axis. */
+	t->tMax.y = Math_SafeDiv(cellBoundary.y - origin->y, dir->y); /* Boundary is a plane on the XZ axis. */
+	t->tMax.z = Math_SafeDiv(cellBoundary.z - origin->z, dir->z); /* Boundary is a plane on the XY axis. */
 
 	/* Determine how far we must travel along the ray before we have crossed a gridcell. */
 	t->tDelta.x = (float)t->step.x * t->invDir.x;