David Adam : d3dx8: Implement D3DXVec2Lerp with a test.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 8d8a5f06c2862080cc74fe923465643b40417a8d
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=8d8a5f06c2862080cc74fe923465643b40417a8d

Author: David Adam <David.Adam at math.cnrs.fr>
Date:   Sun Oct 14 20:31:58 2007 +0200

d3dx8: Implement D3DXVec2Lerp with a test.

---

 dlls/d3dx8/tests/math.c |   10 ++++++++++
 include/d3dx8math.h     |    1 +
 include/d3dx8math.inl   |    9 +++++++++
 3 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/dlls/d3dx8/tests/math.c b/dlls/d3dx8/tests/math.c
index 95452b3..9ae9018 100644
--- a/dlls/d3dx8/tests/math.c
+++ b/dlls/d3dx8/tests/math.c
@@ -88,6 +88,16 @@ static void D3X8Vector2Test(void)
     got = D3DXVec2LengthSq(NULL);
     ok(fabs( got - expected ) < admitted_error, "Expected: %f, Got: %f\n", expected, got);
 
+/*_______________D3DXVec2Lerp__________________________*/
+   expectedvec.x = 68.0f; expectedvec.y = -28.5f;
+   D3DXVec2Lerp(&gotvec,&u,&v,scale);
+   expect_vec(expectedvec,gotvec);
+   /* Tests the case NULL */
+    funcpointer = D3DXVec2Lerp(&gotvec,NULL,&v,scale);
+    ok(funcpointer == NULL, "Expected: %p, Got: %p\n", NULL, funcpointer);
+    funcpointer = D3DXVec2Lerp(NULL,NULL,NULL,scale);
+    ok(funcpointer == NULL, "Expected: %p, Got: %p\n", NULL, funcpointer);
+
 /*_______________D3DXVec2Maximize__________________________*/
    expectedvec.x = 3.0f; expectedvec.y = 9.0f;
    D3DXVec2Maximize(&gotvec,&u,&v);
diff --git a/include/d3dx8math.h b/include/d3dx8math.h
index d39563c..cb1753b 100644
--- a/include/d3dx8math.h
+++ b/include/d3dx8math.h
@@ -63,6 +63,7 @@ FLOAT D3DXVec2CCW(CONST D3DXVECTOR2 *pv1, CONST D3DXVECTOR2 *pv2);
 FLOAT D3DXVec2Dot(CONST D3DXVECTOR2 *pv1, CONST D3DXVECTOR2 *pv2);
 FLOAT D3DXVec2Length(CONST D3DXVECTOR2 *pv);
 FLOAT D3DXVec2LengthSq(CONST D3DXVECTOR2 *pv);
+D3DXVECTOR2* D3DXVec2Lerp(D3DXVECTOR2 *pout, CONST D3DXVECTOR2 *pv1, CONST D3DXVECTOR2 *pv2, FLOAT s);
 D3DXVECTOR2* D3DXVec2Maximize(D3DXVECTOR2 *pout, CONST D3DXVECTOR2 *pv1, CONST D3DXVECTOR2 *pv2);
 D3DXVECTOR2* D3DXVec2Minimize(D3DXVECTOR2 *pout, CONST D3DXVECTOR2 *pv1, CONST D3DXVECTOR2 *pv2);
 D3DXVECTOR2* D3DXVec2Scale(D3DXVECTOR2 *pout, CONST D3DXVECTOR2 *pv, FLOAT s);
diff --git a/include/d3dx8math.inl b/include/d3dx8math.inl
index 81543c1..336ef5a 100644
--- a/include/d3dx8math.inl
+++ b/include/d3dx8math.inl
@@ -51,6 +51,14 @@ extern inline FLOAT D3DXVec2LengthSq(CONST D3DXVECTOR2 *pv)
     return( (pv->x) * (pv->x) + (pv->y) * (pv->y) );
 }
 
+extern inline D3DXVECTOR2* D3DXVec2Lerp(D3DXVECTOR2 *pout, CONST D3DXVECTOR2 *pv1, CONST D3DXVECTOR2 *pv2, FLOAT s)
+{
+    if ( !pout || !pv1 || !pv2) return NULL;
+    pout->x = (1-s) * (pv1->x) + s * (pv2->x);
+    pout->y = (1-s) * (pv1->y) + s * (pv2->y);
+    return pout;
+}
+
 extern inline D3DXVECTOR2* D3DXVec2Maximize(D3DXVECTOR2 *pout, CONST D3DXVECTOR2 *pv1, CONST D3DXVECTOR2 *pv2)
 {
     if ( !pout || !pv1 || !pv2) return NULL;
@@ -66,6 +74,7 @@ extern inline D3DXVECTOR2* D3DXVec2Minimize(D3DXVECTOR2 *pout, CONST D3DXVECTOR2
     pout->y = min(pv1->y , pv2->y);
     return pout;
 }
+
 extern inline D3DXVECTOR2* D3DXVec2Scale(D3DXVECTOR2 *pout, CONST D3DXVECTOR2 *pv, FLOAT s)
 {
     if ( !pout || !pv) return NULL;