d3dx8: Implement D3DXPlaneFromPoints.

dlls/d3dx8/d3dx8.spec

@@ -64,7 +64,7 @@
 @ stdcall D3DXPlaneNormalize(ptr ptr)
 @ stdcall D3DXPlaneIntersectLine(ptr ptr ptr ptr)
 @ stdcall D3DXPlaneFromPointNormal(ptr ptr ptr)
-@ stub D3DXPlaneFromPoints
+@ stdcall D3DXPlaneFromPoints(ptr ptr ptr ptr)
 @ stub D3DXPlaneTransform
 @ stub D3DXColorAdjustSaturation
 @ stub D3DXColorAdjustContrast

dlls/d3dx8/math.c

@@ -491,6 +491,20 @@ D3DXPLANE* WINAPI D3DXPlaneFromPointNormal(D3DXPLANE *pout, CONST D3DXVECTOR3 *p
     return pout;
 }
 
+D3DXPLANE* WINAPI D3DXPlaneFromPoints(D3DXPLANE *pout, CONST D3DXVECTOR3 *pv1, CONST D3DXVECTOR3 *pv2, CONST D3DXVECTOR3 *pv3)
+{
+    D3DXVECTOR3 edge1, edge2, normal, Nnormal;
+
+    edge1.x = 0.0f; edge1.y = 0.0f; edge1.z = 0.0f;
+    edge2.x = 0.0f; edge2.y = 0.0f; edge2.z = 0.0f;
+    D3DXVec3Subtract(&edge1, pv2, pv1);
+    D3DXVec3Subtract(&edge2, pv3, pv1);
+    D3DXVec3Cross(&normal, &edge1, &edge2);
+    D3DXVec3Normalize(&Nnormal, &normal);
+    D3DXPlaneFromPointNormal(pout, pv1, &Nnormal);
+    return pout;
+}
+
 D3DXVECTOR3* WINAPI D3DXPlaneIntersectLine(D3DXVECTOR3 *pout, CONST D3DXPLANE *pp, CONST D3DXVECTOR3 *pv1, CONST D3DXVECTOR3 *pv2)
 {
     D3DXVECTOR3 direction, normal;

dlls/d3dx8/tests/math.c

@@ -437,12 +437,13 @@ static void D3DXMatrixTest(void)
 static void D3DXPlaneTest(void)
 {
     D3DXPLANE expectedplane, gotplane, nulplane, plane;
-    D3DXVECTOR3 expectedvec, gotvec, vec1, vec2;
+    D3DXVECTOR3 expectedvec, gotvec, vec1, vec2, vec3;
     LPD3DXVECTOR3 funcpointer;
     D3DXVECTOR4 vec;
     FLOAT expected, got;
 
     plane.a = -3.0f; plane.b = -1.0f; plane.c = 4.0f; plane.d = 7.0f;
+
     vec.x = 2.0f; vec.y = 5.0f; vec.z = -6.0f; vec.w = 11.0f;
 
 /*_______________D3DXPlaneDot________________*/
@@ -485,6 +486,19 @@ static void D3DXPlaneTest(void)
     D3DXPlaneFromPointNormal(&gotplane,&vec1,&vec2);
     expect_plane(expectedplane, gotplane);
 
+/*_______________D3DXPlaneFromPoints_______*/
+    vec1.x = 1.0f; vec1.y = 2.0f; vec1.z = 3.0f;
+    vec2.x = 1.0f; vec2.y = -6.0f; vec2.z = -5.0f;
+    vec3.x = 83.0f; vec3.y = 74.0f; vec3.z = 65.0f;
+    expectedplane.a = 0.085914f; expectedplane.b = -0.704492f; expectedplane.c = 0.704492f; expectedplane.d = -0.790406f;
+    D3DXPlaneFromPoints(&gotplane,&vec1,&vec2,&vec3);
+    expect_plane(expectedplane, gotplane);
+    /* Test if 2 vectors are parallels */
+    vec3.x = 1.0f; vec3.y = 1.0f; vec3.z = 2.0f;
+    expectedplane.a = 0.0f; expectedplane.b = 0.0f; expectedplane.c = 0.0f; expectedplane.d = 0.0f;
+    D3DXPlaneFromPoints(&gotplane,&vec1,&vec2,&vec3);
+    expect_plane(expectedplane, gotplane);
+
 /*_______________D3DXPlaneIntersectLine___________*/
     vec1.x = 9.0f; vec1.y = 6.0f; vec1.z = 3.0f;
     vec2.x = 2.0f; vec2.y = 5.0f; vec2.z = 8.0f;

include/d3dx8math.h

@@ -294,6 +294,7 @@ D3DXMATRIX* WINAPI D3DXMatrixTranslation(D3DXMATRIX *pout, FLOAT x, FLOAT y, FLO
 D3DXMATRIX* WINAPI D3DXMatrixTranspose(D3DXMATRIX *pout, CONST D3DXMATRIX *pm);
 
 D3DXPLANE* WINAPI D3DXPlaneFromPointNormal(D3DXPLANE *pout, CONST D3DXVECTOR3 *pvpoint, CONST D3DXVECTOR3 *pvnormal);
+D3DXPLANE* WINAPI D3DXPlaneFromPoints(D3DXPLANE *pout, CONST D3DXVECTOR3 *pv1, CONST D3DXVECTOR3 *pv2, CONST D3DXVECTOR3 *pv3);
 D3DXVECTOR3* WINAPI D3DXPlaneIntersectLine(D3DXVECTOR3 *pout, CONST D3DXPLANE *pp, CONST D3DXVECTOR3 *pv1, CONST D3DXVECTOR3 *pv2);
 D3DXPLANE* WINAPI D3DXPlaneNormalize(D3DXPLANE *pout, CONST D3DXPLANE *pp);