DirectX11映射/取消映射对渲染的几何图形没有影响

DirectX11 Mapping/Unmapping has no effect on rendered geometry

本文关键字：映射 几何图形 有影响 取消 DirectX11      更新时间：2023-10-16

我刚刚制作了一个简单的渲染程序，但是它拒绝绘制任何东西，除了我设置的初始顶点。即使我调用Map()和Unmap()，几何形状似乎也不会改变。我有一种感觉，它与Map()和Unmap()有关，但我不确定。现在，我的初始顶点数据由一个三角形组成。然后我用一组由两个三角形组成的新顶点映射顶点缓冲区，但它们没有被渲染。即使我在draw函数中传入6作为顶点数，也只渲染一个三角形。下面是我的设置代码:

VertexData vertexData[] = 
{
    {0.0f,0.0f,0.0f,0.0f,0.0f,1.0f,0.0f,0.0f},
    {0.0f,1.0f,0.0f,0.0f,0.0f,1.0f,0.0f,0.0f},
    {1.0f,1.0f,0.0f,0.0f,0.0f,1.0f,0.0f,0.0f}
};
D3D11_BUFFER_DESC bd;
ZeroMemory(&bd,sizeof(bd));
bd.Usage = D3D11_USAGE_DYNAMIC;
bd.ByteWidth = sizeof(VertexData)*256;
bd.BindFlags = D3D11_BIND_VERTEX_BUFFER;
bd.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
D3D11_SUBRESOURCE_DATA vertexBufferData;
vertexBufferData.pSysMem = vertexData;
vertexBufferData.SysMemPitch = 0;
vertexBufferData.SysMemSlicePitch = 0;
_device->CreateBuffer(&bd, &vertexBufferData, &_renderBuffer);

映射函数:

data是一个包含6个顶点的向量，有6个顶点

D3D11_MAPPED_SUBRESOURCE ms;
ZeroMemory(&ms,sizeof(D3D11_MAPPED_SUBRESOURCE));
_deviceContext->Map(_renderBuffer,NULL,D3D11_MAP_WRITE_DISCARD,NULL,&ms);
memcpy(ms.pData,&data[0],sizeof(VertexData)*data.size());
_deviceContext->Unmap(_renderBuffer,NULL);

下面是我的渲染代码:

_deviceContext->ClearRenderTargetView(_backBuffer,D3DXCOLOR(0.0f,0.0f,0.0f,1.0f));
_deviceContext->Draw(6,0);
_swapChain->Present(0,0);

编辑:禁用背面剔除，但三角形仍未出现。

映射函数
void Render::CopyDataToBuffers(std::vector<VertexData> data)
{
    D3D11_MAPPED_SUBRESOURCE ms;
    ZeroMemory(&ms,sizeof(D3D11_MAPPED_SUBRESOURCE));
    _deviceContext->Map(_renderBuffer,NULL,D3D11_MAP_WRITE_DISCARD,NULL,&ms);
    memcpy(ms.pData,&data[0],sizeof(VertexData)*data.size());
    _deviceContext->Unmap(_renderBuffer,NULL);
}

调用映射函数

std::vector<VertexData> vertexDataVec;
vertexDataVec.push_back(vertexData[0]);
vertexDataVec.push_back(vertexData[1]);
vertexDataVec.push_back(vertexData[2]);
vertexDataVec.push_back(vertexData[3]);
vertexDataVec.push_back(vertexData[4]);
vertexDataVec.push_back(vertexData[5]);
Render::GetRender().CopyDataToBuffers(vertexDataVec);

为了解决这个问题，我只需要创建一个ID3D11RasterizerState并禁用剔除。结构如下:

ID3D11RasterizerState* rasterizerState = NULL;
D3D11_RASTERIZER_DESC rd =
{
        D3D11_FILL_SOLID,
        D3D11_CULL_NONE,
        TRUE,
        1,
        10.0F,
        1.0F,
        TRUE
};
_device->CreateRasterizerState(&rd,&rasterizerState);
_deviceContext->RSSetState(rasterizerState);
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