d3dx8: Implement D3DXPlaneDotNormalize.

dlls/d3dx8/tests/math.c

@@ -60,6 +60,17 @@ static void D3DXPlaneTest(void)
     expected = 0.0f;
     got = D3DXPlaneDotCoord(NULL,NULL),
     ok( expected == got, "Expected : %f, Got : %f\n",expected, got);
+
+/*_______________D3DXPlaneDotNormal______________*/
+    expected = -35.0f;
+    got = D3DXPlaneDotNormal(&plane,&vec),
+    ok( expected == got, "Expected : %f, Got : %f\n",expected, got);
+    expected = 0.0f;
+    got = D3DXPlaneDotNormal(NULL,&vec),
+    ok( expected == got, "Expected : %f, Got : %f\n",expected, got);
+    expected = 0.0f;
+    got = D3DXPlaneDotNormal(NULL,NULL),
+    ok( expected == got, "Expected : %f, Got : %f\n",expected, got);
 }
 
 static void D3X8QuaternionTest(void)

include/d3dx8math.inl

@@ -270,6 +270,12 @@ static inline FLOAT D3DXPlaneDotCoord(CONST D3DXPLANE *pp, CONST D3DXVECTOR4 *pv
     return ( (pp->a) * (pv->x) + (pp->b) * (pv->y) + (pp->c) * (pv->z) + (pp->d) );
 }
 
+static inline FLOAT D3DXPlaneDotNormal(CONST D3DXPLANE *pp, CONST D3DXVECTOR4 *pv)
+{
+    if ( !pp || !pv ) return 0.0f;
+    return ( (pp->a) * (pv->x) + (pp->b) * (pv->y) + (pp->c) * (pv->z) );
+}
+
 /*__________________D3DXQUATERNION____________________*/
 
 static inline D3DXQUATERNION* D3DXQuaternionConjugate(D3DXQUATERNION *pout, CONST D3DXQUATERNION *pq)