DirectX9为什么画不出来？急！

dataxdata 2013-02-26 09:52:54

用DirectX9画一个最简单的线，从原点画到（2, 0, 0)，为什么画不出来？



struct CustomVertexColor {

    float eX, eY, eZ;

    DWORD dwColor;

};



const int c_d3d9_vertexfvf_idXyzColor = D3DFVF_XYZ|D3DFVF_DIFFUSE;



    //初始化顶点

    CustomVertexColor a_vertex[2];

    int nVertex = 2;

    a_vertex[0].eX = 0;

    a_vertex[0].eY = 0;

    a_vertex[0].eZ = 0;

    a_vertex[1].eX = 2;

    a_vertex[1].eY = 0;

    a_vertex[1].eZ = 0;

    a_vertex[0].dwColor = D3DCOLOR_ARGB(128, 255, 255, 255);

    a_vertex[1].dwColor = D3DCOLOR_ARGB(128, 255, 255, 255);



    // 设置顶点缓冲区

    IDirect3DVertexBuffer9 *pVertexBuf;

    mp_dev->CreateVertexBuffer(sizeof(CustomVertexColor) * nVertex, 0, c_d3d9_vertexfvf_idXyzColor, D3DPOOL_DEFAULT, &pVertexBuf, NULL);

    void *pVertex;

    pVertexBuf->Lock(0, 0, &pVertex, 0);

    memcpy(pVertex, a_vertex, sizeof(CustomVertexColor) * nVertex);

    pVertexBuf->Unlock();



    // 开始画图

    if ( FAILED(mp_dev->BeginScene()) )

        MessageBeep(0xFFFFFFFF);

    if ( FAILED(mp_dev->Clear(0, NULL, D3DCLEAR_TARGET, 0, 1.0f, 0)) )

        MessageBeep(0xFFFFFFFF);

    SetTransform();

    if ( FAILED(mp_dev->SetStreamSource(0, pVertexBuf, 0, nVertex)) )

        MessageBeep(0xFFFFFFFF);

    if ( FAILED(mp_dev->SetFVF(c_d3d9_vertexfvf_idXyzColor)) )

        MessageBeep(0xFFFFFFFF);

    if ( FAILED(mp_dev->DrawPrimitive(D3DPT_LINELIST, 0, nVertex / 2)) )

        MessageBeep(0xFFFFFFFF);

    mp_dev->EndScene();



    if ( FAILED(mp_dev->Present(NULL, NULL, NULL, NULL)) )

        MessageBeep(0xFFFFFFFF);



    pVertexBuf->Release();



// Transform部分

void SetTransform() {

    D3DXMATRIX matTranslate, matScale, matRotate, matRotateY, matRotateZ;

    static D3DXMATRIX s_matTransWorld, s_matTransView, s_matTransProj;



    D3DXMatrixIdentity(&s_matTransWorld);

    float eScale = 50.0;

    D3DXMatrixScaling(&matScale, eScale, eScale, eScale);

    D3DXMatrixMultiply(&s_matTransWorld, &s_matTransWorld, &matScale);



    D3DXVECTOR3 vecPosition(0.0f, 0.0f, -450.f);

    D3DXVECTOR3 vecLook(0.0f, 0.0f, 0.0f);

    D3DXMatrixLookAtLH(&s_matTransView, &vecPosition, &vecLook, &D3DXVECTOR3(0.0f, 1.0f, 0.0f)); //up direction



    D3DXMatrixPerspectiveFovLH(&s_matTransProj, D3DX_PI/4, float(pnlRender->Width)/float(pnlRender->Height), 1.0f, 600.0f);



    mp_dev->SetTransform(D3DTS_WORLD, &s_matTransWorld);

    mp_dev->SetTransform(D3DTS_VIEW, &s_matTransView);

    mp_dev->SetTransform(D3DTS_PROJECTION, &s_matTransProj);

}