【求助】HOOK D3D DIP 后的矩阵问题

0xAA66

以下是老外的换算代码。
理解为用3个矩阵坐标换算出屏幕坐标
UINT OffsetInBytes,Stride;
VOID* pIndex,*pData;
D3DXVECTOR3 Vector2D;
pDevice->GetVertexShaderConstantF(0,ViewProjectionMatrix,4);    这里取顶点矩阵坐标？（三个参数表什么呢，为何 是 0，4    230，4    9，3  msdn 也没找到）
pDevice->GetVertexShaderConstantF(230,LocalToWorld,4);
pDevice->GetVertexShaderConstantF(9,WorldToLocal,3);
pDevice->GetIndices(&pIndexData);
pDevice->GetViewport(&Viewport);
pDevice->GetStreamSource(0, &pStreamData, &OffsetInBytes, &Stride);

D3DXMatrixIdentity(&WorldToLocal);
D3DXVECTOR3 VectorMiddle(0,0,0),ScreenMiddle(Viewport.Width/2,Viewport.Height/2,0);


D3DXVec3Unproject(&VectorMiddle,&ScreenMiddle,&Viewport,&ViewProjectionMatrix,&LocalToWorld,&WorldToLocal);


D3DXVec3Project(&Vector2D,&Vector3D, &Viewport, &ViewProjectionMatrix,&LocalToWorld,&WorldToLocal);

    {
        DrawRectangle(Vector2D.x,Vector2D.y,30,30);
    }