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d3dx8: Simplify D3DXMatrixInverse().

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This commit is contained in:
Gerald Pfeifer 2008-02-24 16:39:08 +01:00 committed by Alexandre Julliard
parent 3ed963dc5d
commit 6766f9c1a0
1 changed files with 6 additions and 13 deletions
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19
dlls/d3dx8/math.c
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@ -114,7 +114,7 @@ D3DXMATRIX* WINAPI D3DXMatrixInverse(D3DXMATRIX *pout, FLOAT *pdeterminant, CONS
{
int a, i, j;
D3DXVECTOR4 v, vec[3];
FLOAT cofactor, det;
FLOAT det;
det = D3DXMatrixfDeterminant(pm);
if ( !det ) return NULL;
@ -134,19 +134,12 @@ D3DXMATRIX* WINAPI D3DXMatrixInverse(D3DXMATRIX *pout, FLOAT *pdeterminant, CONS
}
}
D3DXVec4Cross(&v, &vec[0], &vec[1], &vec[2]);
for (j=0; j<4; j++)
{
switch(j)
{
case 0: cofactor = v.x; break;
case 1: cofactor = v.y; break;
case 2: cofactor = v.z; break;
case 3: cofactor = v.w; break;
}
pout->u.m[j][i] = pow(-1.0f, i) * cofactor / det;
}
pout->u.m[0][i] = pow(-1.0f, i) * v.x / det;
pout->u.m[1][i] = pow(-1.0f, i) * v.y / det;
pout->u.m[2][i] = pow(-1.0f, i) * v.z / det;
pout->u.m[3][i] = pow(-1.0f, i) * v.w / det;
}
return pout;
return pout;
}
D3DXMATRIX* WINAPI D3DXMatrixLookAtLH(D3DXMATRIX *pout, CONST D3DXVECTOR3 *peye, CONST D3DXVECTOR3 *pat, CONST D3DXVECTOR3 *pup)