Question

我想通过directx11显示一个框，当我尝试两个代码时，我认为两个相同的代码会出现不同的结果。这两个代码有什么不同？

代码从这句话开始。

std::vector<VERTEX::objVertex> vertices;

HRESULT Object::Create(ID3D11Device* pDevice, const char* Filename)
{
vector<UINT> Indices;

wchar_t* strFilename = new wchar_t[MAX_PATH];
mbstowcs(strFilename, Filename, strlen(Filename) + 1);

HR(LoadGeometryFromOBJ(strFilename, &Indices));
HR(CreateBuffer(pDevice, &Indices));

return S_OK;
}

从这些代码开始不同。

第一个类型代码。

HRESULT Object::LoadGeometryFromOBJ(const WCHAR* strFilename, vector<UINT>* Indices)
{
vector<XMFLOAT3> Positions;
vector<XMFLOAT2> TexCoords;
vector<XMFLOAT3> Normals;

VERTEX::objVertex vertic[] =
{
{ XMFLOAT3(-1.0f, -1.0f, -1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) },
{ XMFLOAT3(-1.0f, +1.0f, -1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) },
{ XMFLOAT3(+1.0f, +1.0f, -1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) },
{ XMFLOAT3(+1.0f, -1.0f, -1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) },
{ XMFLOAT3(-1.0f, -1.0f, +1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) },
{ XMFLOAT3(-1.0f, +1.0f, +1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) },
{ XMFLOAT3(+1.0f, +1.0f, +1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) },
{ XMFLOAT3(+1.0f, -1.0f, +1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) }
};

for (int i = 0; i < 8; i++)
{
vertices.push_back(vertic[i]);
}

UINT indic[] = {
// front face
0, 1, 2,
0, 2, 3,

// back face
4, 6, 5,
4, 7, 6,

// left face
4, 5, 1,
4, 1, 0,

// right face
3, 2, 6,
3, 6, 7,

// top face
1, 5, 6,
1, 6, 2,

// bottom face
4, 0, 3,
4, 3, 7
};

for (int i = 0; i < 36; i++)
Indices->push_back(indic[i]);

return S_OK;
}

HRESULT Object::CreateBuffer(ID3D11Device* Device, vector<UINT>* indices)
{
D3D11_BUFFER_DESC vbd;
vbd.Usage = D3D11_USAGE_IMMUTABLE;
vbd.ByteWidth = sizeof(VERTEX::objVertex)* 8;
vbd.BindFlags = D3D11_BIND_VERTEX_BUFFER;
vbd.CPUAccessFlags = 0;
vbd.MiscFlags = 0;
vbd.StructureByteStride = 0;
D3D11_SUBRESOURCE_DATA vinitData;
vinitData.pSysMem = &(vertices[0]);
HR(Device->CreateBuffer(&vbd, &vinitData, &pmVB));


// Create the index buffer



D3D11_BUFFER_DESC ibd;
ibd.Usage = D3D11_USAGE_IMMUTABLE;
ibd.ByteWidth = sizeof(UINT)* 36;
ibd.BindFlags = D3D11_BIND_INDEX_BUFFER;
ibd.CPUAccessFlags = 0;
ibd.MiscFlags = 0;
ibd.StructureByteStride = 0;
D3D11_SUBRESOURCE_DATA iinitData;
iinitData.pSysMem = &((*indices)[0]);
HR(Device->CreateBuffer(&ibd, &iinitData, &pmIB));

return S_OK;
}

第二种类型代码。

HRESULT Object::CreateBuffer(ID3D11Device* Device, vector<UINT>* index)
{
VERTEX::objVertex vertices[] =
{
    { XMFLOAT3(-1.0f, -1.0f, -1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) },
    { XMFLOAT3(-1.0f, +1.0f, -1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) },
    { XMFLOAT3(+1.0f, +1.0f, -1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) },
    { XMFLOAT3(+1.0f, -1.0f, -1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) },
    { XMFLOAT3(-1.0f, -1.0f, +1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) },
    { XMFLOAT3(-1.0f, +1.0f, +1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) },
    { XMFLOAT3(+1.0f, +1.0f, +1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) },
    { XMFLOAT3(+1.0f, -1.0f, +1.0f), XMFLOAT3(0.0f, 0.0f, 0.0f), XMFLOAT2(0.0f, 0.0f) }
};

D3D11_BUFFER_DESC vbd;
vbd.Usage = D3D11_USAGE_IMMUTABLE;
vbd.ByteWidth = sizeof(VERTEX::objVertex)* 8;
vbd.BindFlags = D3D11_BIND_VERTEX_BUFFER;
vbd.CPUAccessFlags = 0;
vbd.MiscFlags = 0;
vbd.StructureByteStride = 0;
D3D11_SUBRESOURCE_DATA vinitData;
vinitData.pSysMem = vertices;
HR(Device->CreateBuffer(&vbd, &vinitData, &pmVB));


// Create the index buffer

UINT indices[] = {
    // front face
    0, 1, 2,
    0, 2, 3,

    // back face
    4, 6, 5,
    4, 7, 6,

    // left face
    4, 5, 1,
    4, 1, 0,

    // right face
    3, 2, 6,
    3, 6, 7,

    // top face
    1, 5, 6,
    1, 6, 2,

    // bottom face
    4, 0, 3,
    4, 3, 7
};

D3D11_BUFFER_DESC ibd;
ibd.Usage = D3D11_USAGE_IMMUTABLE;
ibd.ByteWidth = sizeof(UINT)* 36;
ibd.BindFlags = D3D11_BIND_INDEX_BUFFER;
ibd.CPUAccessFlags = 0;
ibd.MiscFlags = 0;
ibd.StructureByteStride = 0;
D3D11_SUBRESOURCE_DATA iinitData;
iinitData.pSysMem = indices;
HR(Device->CreateBuffer(&ibd, &iinitData, &pmIB));

return S_OK;
}

对我来说，这两个代码看起来一样。我认为第一个代码只是从第二个代码扩展到两个短语，并按矢量类型设置顶点数据。但第一个代码不起作用。

这两个代码有什么不同，如果我想写第一个类型我该怎么办？

directx11中的两个代码有什么不同？

0 个答案: