d3dx8: Implement D3DXVec2Add with a test.

dlls/d3dx8/tests/math.c

@@ -24,14 +24,27 @@
 
 #define admitted_error 0.00001f
 
+#define expect_vec(expectedvec,gotvec) ok((fabs(expectedvec.x-gotvec.x)<admitted_error)&&(fabs(expectedvec.y-gotvec.y)<admitted_error),"Expected Vector= (%f, %f)\n , Got Vector= (%f, %f)\n", expectedvec.x, expectedvec.y, gotvec.x, gotvec.y);
+
 static void D3X8Vector2Test(void)
 {
-    D3DXVECTOR2 u,v;
+    D3DXVECTOR2 expectedvec, gotvec, u, v;
+    LPD3DXVECTOR2 funcpointer;
     FLOAT expected, got;
 
     u.x=3.0f; u.y=4.0f;
     v.x=-7.0f; v.y=9.0f;
 
+/*_______________D3DXVec2Add__________________________*/
+   expectedvec.x = -4.0f; expectedvec.y = 13.0f;
+   D3DXVec2Add(&gotvec,&u,&v);
+   expect_vec(expectedvec,gotvec);
+   /* Tests the case NULL */
+    funcpointer = D3DXVec2Add(&gotvec,NULL,&v);
+    ok(funcpointer == NULL, "Expected: %p, Got: %p\n", NULL, funcpointer);
+    funcpointer = D3DXVec2Add(NULL,NULL,NULL);
+    ok(funcpointer == NULL, "Expected: %p, Got: %p\n", NULL, funcpointer);
+
 /*_______________D3DXVec2CCW__________________________*/
    expected = 55.0f;
    got = D3DXVec2CCW(&u,&v);

include/d3dx8math.h

@@ -58,6 +58,7 @@ typedef struct D3DXCOLOR
     FLOAT r, g, b, a;
 } D3DXCOLOR, *LPD3DXCOLOR;
 
+D3DXVECTOR2* D3DXVec2Add(D3DXVECTOR2 *pout, CONST D3DXVECTOR2 *pv1, CONST D3DXVECTOR2 *pv2);
 FLOAT D3DXVec2CCW(CONST D3DXVECTOR2 *pv1, CONST D3DXVECTOR2 *pv2);
 FLOAT D3DXVec2Dot(CONST D3DXVECTOR2 *pv1, CONST D3DXVECTOR2 *pv2);
 FLOAT D3DXVec2Length(CONST D3DXVECTOR2 *pv);

include/d3dx8math.inl

@@ -19,6 +19,14 @@
 #ifndef __D3DX8MATH_INL__
 #define __D3DX8MATH_INL__
 
+extern inline D3DXVECTOR2* D3DXVec2Add(D3DXVECTOR2 *pout, CONST D3DXVECTOR2 *pv1, CONST D3DXVECTOR2 *pv2)
+{
+    if ( !pout || !pv1 || !pv2) return NULL;
+    pout->x = pv1->x + pv2->x;
+    pout->y = pv1->y + pv2->y;
+    return pout;
+}
+
 extern inline FLOAT D3DXVec2CCW(CONST D3DXVECTOR2 *pv1, CONST D3DXVECTOR2 *pv2)
 {
     if ( !pv1 || !pv2) return 0.0f;