如何打开共享纹理的 Direct2D

要在Direct2D中打开共享纹理，需要遵循以下步骤：

1. 创建共享纹理： 首先，使用Direct3D创建一个共享纹理。确保将共享标志设置为D3D11_RESOURCE_MISC_SHARED。

ID3D11Texture2D* pSharedTexture = nullptr;
D3D11_TEXTURE2D_DESC desc = { 0 };
desc.Width = width;
desc.Height = height;
desc.MipLevels = 1;
desc.ArraySize = 1;
desc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
desc.SampleDesc.Count = 1;
desc.Usage = D3D11_USAGE_DEFAULT;
desc.BindFlags = D3D11_BIND_RENDER_TARGET | D3D11_BIND_SHADER_RESOURCE;
desc.CPUAccessFlags = 0;
desc.MiscFlags = D3D11_RESOURCE_MISC_SHARED;

device->CreateTexture2D(&desc, nullptr, &pSharedTexture);

2. 获取共享句柄： 使用ID3D11Texture2D接口的QueryInterface方法获取ID3D11Resource接口，然后使用该接口的GetSharedHandle方法获取共享句柄。

ID3D11Resource* pResource = nullptr;
pSharedTexture->QueryInterface(IID_ID3D11Resource, (void**)&pResource);

HANDLE sharedHandle;
pDevice->CreateSharedHandle(pResource, nullptr, GENERIC_ALL, 0, &sharedHandle);

3. 创建Direct2D设备和设备上下文： 创建Direct2D设备和设备上下文，以便在Direct2D中使用共享纹理。

ID2D1Device* pD2DDevice = nullptr;
ID2D1DeviceContext* pD2DDeviceContext = nullptr;

D2D1CreateDevice(nullptr, nullptr, &pD2DDevice);
pD2DDevice->CreateDeviceContext(D2D1_DEVICE_CONTEXT_OPTIONS_NONE, &pD2DDeviceContext);

4. 打开共享纹理： 使用Direct2D设备上下文的CreateBitmapFromDxgiSurface方法打开共享纹理。

ID2D1Bitmap1* pD2DBitmap = nullptr;

pD2DDeviceContext->CreateBitmapFromDxgiSurface(pSharedSurface, nullptr, &pD2DBitmap);

完整的代码示例如下：

#include <d3d11.h>
#include <d2d1_1.h>

void OpenSharedTexture()
{
    // 创建共享纹理
    ID3D11Texture2D* pSharedTexture = nullptr;
    D3D11_TEXTURE2D_DESC desc = { 0 };
    desc.Width = width;
    desc.Height = height;
    desc.MipLevels = 1;
    desc.ArraySize = 1;
    desc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
    desc.SampleDesc.Count = 1;
    desc.Usage = D3D11_USAGE_DEFAULT;
    desc.BindFlags = D3D11_BIND_RENDER_TARGET | D3D11_BIND_SHADER_RESOURCE;
    desc.CPUAccessFlags = 0;
    desc.MiscFlags = D3D11_RESOURCE_MISC_SHARED;

    device->CreateTexture2D(&desc, nullptr, &pSharedTexture);

    // 获取共享句柄
    ID3D11Resource* pResource = nullptr;
    pSharedTexture->QueryInterface(IID_ID3D11Resource, (void**)&pResource);

    HANDLE sharedHandle;
    pDevice->CreateSharedHandle(pResource, nullptr, GENERIC_ALL, 0, &sharedHandle);

    // 创建Direct2D设备和设备上下文
    ID2D1Device* pD2DDevice = nullptr;
    ID2D1DeviceContext* pD2DDeviceContext = nullptr;

    D2D1CreateDevice(nullptr, nullptr, &pD2DDevice);
    pD2DDevice->CreateDeviceContext(D2D1_DEVICE_CONTEXT_OPTIONS_NONE, &pD2DDeviceContext);

    // 打开共享纹理
    ID2D1Bitmap1* pD2DBitmap = nullptr;
    DXGI_SURFACE_DESC surfaceDesc = { 0 };
    surfaceDesc.Width = width;
    surfaceDesc.Height = height;
    surfaceDesc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
    surfaceDesc.SampleDesc.Count = 1;
    surfaceDesc.SampleDesc.Quality = 0;

    pD2DDeviceContext->CreateBitmapFromDxgiSurface(pSharedSurface, &surfaceDesc, &