d3dx8: Implement D3DXQuaternionConjugate.

dlls/d3dx8/tests/math.c

@@ -32,12 +32,24 @@
 
 static void D3X8QuaternionTest(void)
 {
-    D3DXQUATERNION q, r;
+    D3DXQUATERNION expectedquat, gotquat, q, r;
+    LPD3DXQUATERNION funcpointer;
     FLOAT expected, got;
 
     q.x = 1.0f, q.y = 2.0f; q.z = 4.0f; q.w = 10.0f;
     r.x = -3.0f; r.y = 4.0f; r.z = -5.0f; r.w = 7.0;
 
+/*_______________D3DXQuaternionConjugate________________*/
+    expectedquat.x = -1.0f; expectedquat.y = -2.0f; expectedquat.z = -4.0f; expectedquat.w = 10.0f;
+    D3DXQuaternionConjugate(&gotquat,&q);
+    expect_vec4(expectedquat,gotquat);
+    /* Test the NULL case */
+    funcpointer = D3DXQuaternionConjugate(&gotquat,NULL);
+    ok(funcpointer == NULL, "Expected: %p, Got: %p\n", NULL, funcpointer);
+    funcpointer = D3DXQuaternionConjugate(NULL,NULL);
+    ok(funcpointer == NULL, "Expected: %p, Got: %p\n", NULL, funcpointer);
+
+
 /*_______________D3DXQuaternionDot______________________*/
     expected = 55.0f;
     got = D3DXQuaternionDot(&q,&r);

include/d3dx8math.inl

@@ -258,6 +258,16 @@ static inline D3DXVECTOR4* D3DXVec4Subtract(D3DXVECTOR4 *pout, CONST D3DXVECTOR4
 
 /*__________________D3DXQUATERNION____________________*/
 
+static inline D3DXQUATERNION* D3DXQuaternionConjugate(D3DXQUATERNION *pout, CONST D3DXQUATERNION *pq)
+{
+    if ( !pout || !pq) return NULL;
+    pout->x = -pq->x;
+    pout->y = -pq->y;
+    pout->z = -pq->z;
+    pout->w = pq->w;
+    return pout;
+}
+
 static inline FLOAT D3DXQuaternionDot(CONST D3DXQUATERNION *pq1, CONST D3DXQUATERNION *pq2)
 {
     if ( !pq1 || !pq2 ) return 0.0f;