diff --git a/engine/common/mathlib.h b/engine/common/mathlib.h
index be5e46540..accb22d4e 100644
--- a/engine/common/mathlib.h
+++ b/engine/common/mathlib.h
@@ -106,7 +106,10 @@ void RotatePointAroundVector( vec3_t dst, const vec3_t dir, const vec3_t point,
 //used for crosshair stuff.
 void ML_Project (vec3_t in, vec3_t out, vec3_t viewangles, vec3_t vieworg, float wdivh, float fovy);
 void Matrix3_Multiply (vec3_t *in1, vec3_t *in2, vec3_t *out);
+void Matrix4_Multiply(float *a, float *b, float *out);
 void Matrix4_Transform3(float *matrix, float *vector, float *product);
+void Matrix4_Transform4(float *matrix, float *vector, float *product);
+void Matrix4x4_Invert_Simple (float *out, const float *in1);
 void ML_ModelViewMatrix(float *modelview, vec3_t viewangles, vec3_t vieworg);
 void ML_ProjectionMatrix2(float *proj, float fovx, float fovy);
 void ML_ModelViewMatrixFromAxis(float *modelview, vec3_t pn, vec3_t right, vec3_t up, vec3_t vieworg);
diff --git a/engine/common/particles.h b/engine/common/particles.h
index 1f628401c..2cc9189c3 100644
--- a/engine/common/particles.h
+++ b/engine/common/particles.h
@@ -144,6 +144,7 @@ int P_AllocateParticleType(char *name);	//find one if it exists, or create if it
 int P_FindParticleType(char *name); //checks if particle description 'name' exists, returns -1 if not.
 
 int P_DescriptionIsLoaded(char *name);	//returns true if it's usable.
+qboolean P_TypeIsLoaded(int effect);
 
 void P_SkyTri(float *v1, float *v2, float *v3, struct msurface_s *surf);