Method DX11StructuredBuffer

GTE/Graphics/DX11/DX11StructuredBuffer.cpp:19–84

}

DX11StructuredBuffer::DX11StructuredBuffer(ID3D11Device* device, StructuredBuffer const* sbuffer)
    :
    DX11Buffer(sbuffer),
    mSRView(nullptr),
    mUAView(nullptr),
    mCounterStaging(nullptr)
{
    // Specify the buffer description.
    D3D11_BUFFER_DESC desc;
    desc.ByteWidth = sbuffer->GetNumBytes();
    desc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
    desc.MiscFlags = D3D11_RESOURCE_MISC_BUFFER_STRUCTURED;
    desc.StructureByteStride = sbuffer->GetElementSize();
    uint32_t usage = sbuffer->GetUsage();
    if (usage == Resource::Usage::IMMUTABLE)
    {
        desc.Usage = D3D11_USAGE_IMMUTABLE;
        desc.CPUAccessFlags = D3D11_CPU_ACCESS_NONE;
    }
    else if (usage == Resource::Usage::DYNAMIC_UPDATE)
    {
        desc.Usage = D3D11_USAGE_DYNAMIC;
        desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
    }
    else  // usage == Resource::Usage::SHADER_OUTPUT
    {
        desc.Usage = D3D11_USAGE_DEFAULT;
        desc.BindFlags |= D3D11_BIND_UNORDERED_ACCESS;
        desc.CPUAccessFlags = D3D11_CPU_ACCESS_NONE;
    }

    // Create the buffer.
    ID3D11Buffer* buffer = nullptr;
    if (sbuffer->GetData())
    {
        D3D11_SUBRESOURCE_DATA data;
        data.pSysMem = sbuffer->GetData();
        data.SysMemPitch = 0;
        data.SysMemSlicePitch = 0;
        DX11Log(device->CreateBuffer(&desc, &data, &buffer));
    }
    else
    {
        DX11Log(device->CreateBuffer(&desc, nullptr, &buffer));
    }
    mDXObject = buffer;

    // Create views of the buffer.
    CreateSRView(device);
    if (usage == Resource::Usage::SHADER_OUTPUT)
    {
        CreateUAView(device);
    }

    // Create a staging buffer if requested.
    if (sbuffer->GetCopy() != Resource::Copy::NONE)
    {
        CreateStaging(device, desc);