[PATCH] Implement D3DXMatrixLookAtLH with a test

[David Adam]

---
 dlls/d3dx8/d3dx8.spec   |    2 +-
 dlls/d3dx8/math.c       |   29 +++++++++++++++++++++++++++++
 dlls/d3dx8/tests/math.c |    8 ++++++++
 include/d3dx8math.h     |    1 +
 4 files changed, 39 insertions(+), 1 deletions(-)

diff --git a/dlls/d3dx8/d3dx8.spec b/dlls/d3dx8/d3dx8.spec
index 25f3bc4..e562cde 100644
--- a/dlls/d3dx8/d3dx8.spec
+++ b/dlls/d3dx8/d3dx8.spec
@@ -35,7 +35,7 @@
 @ stub D3DXMatrixTransformation
 @ stub D3DXMatrixAffineTransformation
 @ stdcall D3DXMatrixLookAtRH(ptr ptr ptr ptr ptr)
-@ stub D3DXMatrixLookAtLH
+@ stdcall D3DXMatrixLookAtLH(ptr ptr ptr ptr)
 @ stub D3DXMatrixPerspectiveRH
 @ stub D3DXMatrixPerspectiveLH
 @ stub D3DXMatrixPerspectiveFovRH
diff --git a/dlls/d3dx8/math.c b/dlls/d3dx8/math.c
index 2de1bd1..52a4c48 100644
--- a/dlls/d3dx8/math.c
+++ b/dlls/d3dx8/math.c
@@ -44,6 +44,35 @@ FLOAT WINAPI D3DXMatrixfDeterminant(CONST D3DXMATRIX *pm)
     return det;
 }
=20
+D3DXMATRIX* WINAPI D3DXMatrixLookAtLH(D3DXMATRIX *pout, CONST D3DXVECTOR3 *=
peye, CONST D3DXVECTOR3 *pat, CONST D3DXVECTOR3 *pup)
+{
+    D3DXVECTOR3 right, rightn, up, upn, vec, vec2;
+
+    D3DXVec3Subtract(&vec2, pat, peye);
+    D3DXVec3Normalize(&vec, &vec2);
+    D3DXVec3Cross(&right, pup, &vec);
+    D3DXVec3Cross(&up, &vec, &right);
+    D3DXVec3Normalize(&rightn, &right);
+    D3DXVec3Normalize(&upn, &up);
+    pout->m[0][0] =3D rightn.x;
+    pout->m[1][0] =3D rightn.y;
+    pout->m[2][0] =3D rightn.z;
+    pout->m[3][0] =3D -D3DXVec3Dot(&rightn,peye);
+    pout->m[0][1] =3D upn.x;
+    pout->m[1][1] =3D upn.y;
+    pout->m[2][1] =3D upn.z;
+    pout->m[3][1] =3D -D3DXVec3Dot(&upn, peye);
+    pout->m[0][2] =3D vec.x;
+    pout->m[1][2] =3D vec.y;
+    pout->m[2][2] =3D vec.z;
+    pout->m[3][2] =3D -D3DXVec3Dot(&vec, peye);
+    pout->m[0][3] =3D 0.0f;
+    pout->m[1][3] =3D 0.0f;
+    pout->m[2][3] =3D 0.0f;
+    pout->m[3][3] =3D 1.0f;
+    return pout;
+}
+
 D3DXMATRIX* WINAPI D3DXMatrixLookAtRH(D3DXMATRIX *pout, CONST D3DXVECTOR3 *=
peye, CONST D3DXVECTOR3 *pat, CONST D3DXVECTOR3 *pup)
 {
     D3DXVECTOR3 right, rightn, up, upn, vec, vec2;
diff --git a/dlls/d3dx8/tests/math.c b/dlls/d3dx8/tests/math.c
index 71da793..040d6e0 100644
--- a/dlls/d3dx8/tests/math.c
+++ b/dlls/d3dx8/tests/math.c
@@ -198,6 +198,14 @@ static void D3DXMatrixTest(void)
     got =3D D3DXMatrixIsIdentity(NULL);
     ok(expected =3D=3D got, "Expected : %d, Got : %d\n", expected, got);
=20
+/*____________D3DXMatrixLookatLH_______________*/
+    expectedmat.m[0][0] =3D -0.822465f; expectedmat.m[0][1] =3D -0.409489f;=
 expectedmat.m[0][2] =3D -0.394803f; expectedmat.m[0][3] =3D 0.0f;
+    expectedmat.m[1][0] =3D -0.555856f; expectedmat.m[1][1] =3D 0.431286f; =
expectedmat.m[1][2] =3D 0.710645f; expectedmat.m[1][3] =3D 0.0f;
+    expectedmat.m[2][0] =3D -0.120729f; expectedmat.m[2][1] =3D 0.803935f; =
expectedmat.m[2][2] =3D -0.582335f; expectedmat.m[2][3] =3D 0.0f;
+    expectedmat.m[3][0] =3D 4.494634f; expectedmat.m[3][1] =3D 0.809719f; e=
xpectedmat.m[3][2] =3D 10.060076f; expectedmat.m[3][3] =3D 1.0f;
+    D3DXMatrixLookAtLH(&gotmat,&eye,&at,&axis);
+    expect_mat(expectedmat,gotmat);
+
 /*____________D3DXMatrixLookatRH_______________*/
     expectedmat.m[0][0] =3D 0.822465f; expectedmat.m[0][1] =3D -0.409489f; =
expectedmat.m[0][2] =3D 0.394803f; expectedmat.m[0][3] =3D 0.0f;
     expectedmat.m[1][0] =3D 0.555856f; expectedmat.m[1][1] =3D 0.431286f; e=
xpectedmat.m[1][2] =3D -0.710645f; expectedmat.m[1][3] =3D 0.0f;
diff --git a/include/d3dx8math.h b/include/d3dx8math.h
index b31e24d..7f005c1 100644
--- a/include/d3dx8math.h
+++ b/include/d3dx8math.h
@@ -59,6 +59,7 @@ typedef struct D3DXCOLOR
 } D3DXCOLOR, *LPD3DXCOLOR;
=20
 FLOAT WINAPI D3DXMatrixfDeterminant(CONST D3DXMATRIX *pm);
+D3DXMATRIX* WINAPI D3DXMatrixLookAtLH(D3DXMATRIX *pout, CONST D3DXVECTOR3 *=
peye, CONST D3DXVECTOR3 *pat, CONST D3DXVECTOR3 *pup);
 D3DXMATRIX* WINAPI D3DXMatrixLookAtRH(D3DXMATRIX *pout, CONST D3DXVECTOR3 *=
peye, CONST D3DXVECTOR3 *pat, CONST D3DXVECTOR3 *pup);
 D3DXMATRIX* WINAPI D3DXMatrixMultiply(D3DXMATRIX *pout, CONST D3DXMATRIX *p=
m1, CONST D3DXMATRIX *pm2);
 D3DXMATRIX* WINAPI D3DXMatrixRotationAxis(D3DXMATRIX *pout, CONST D3DXVECTO=
R3 *pv, FLOAT angle);
--=20
1.5.3.2


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