d3drm: Implement D3DVectorSubtract.

dlls/d3drm/d3drm.spec

@@ -17,7 +17,7 @@
 @ stub D3DRMVectorReflect
 @ stub D3DRMVectorRotate
 @ stub D3DRMVectorScale
-@ stub D3DRMVectorSubtract
+@ stdcall D3DRMVectorSubtract(ptr ptr ptr)
 @ stub Direct3DRMCreate
 @ stub DllCanUnloadNow
 @ stub DllGetClassObject

dlls/d3drm/math.c

@@ -40,3 +40,12 @@ LPD3DVECTOR WINAPI D3DRMVectorAdd(LPD3DVECTOR d, LPD3DVECTOR s1, LPD3DVECTOR s2)
     d->z=s1->z + s2->z;
     return d;
 }
+
+/* Subtract Two Vectors */
+LPD3DVECTOR WINAPI D3DRMVectorSubtract(LPD3DVECTOR d, LPD3DVECTOR s1, LPD3DVECTOR s2)
+{
+    d->x=s1->x - s2->x;
+    d->y=s1->y - s2->y;
+    d->z=s1->z - s2->z;
+    return d;
+}

dlls/d3drm/tests/vector.c

@@ -41,6 +41,11 @@ void VectorTest(void)
     D3DRMVectorAdd(&r,&u,&v);
     e.x=6.0;e.y=6.0;e.z=1.0;
     expect_vec(e,r);
+
+/*_______________________VectorSubtract__________________________*/
+    D3DRMVectorSubtract(&r,&u,&v);
+    e.x=-2.0;e.y=-2.0;e.z=1.0;
+    expect_vec(e,r);
 }
 
 START_TEST(vector)