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我正在尝试添加一些用于 IMGUI 库的图像。基本上，IMGUI可以获取directx或OpenGL的原始纹理数据进行绘制。您可以从 IMGUI 中查看用于创建纹理的示例代码；

// Simple helper function to load an image into a DX11 texture with common settings
bool LoadTextureFromFile(const char* filename, ID3D11ShaderResourceView** out_srv, int* out_width, int* out_height)
{
// Load from disk into a raw RGBA buffer
int image_width = 0;
int image_height = 0;
unsigned char* image_data = stbi_load(filename, &image_width, &image_height, NULL, 4);
if (image_data == NULL)
    return false;

// Create texture
D3D11_TEXTURE2D_DESC desc;
ZeroMemory(&desc, sizeof(desc));
desc.Width = image_width;
desc.Height = image_height;
desc.MipLevels = 1;
desc.ArraySize = 1;
desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
desc.SampleDesc.Count = 1;
desc.Usage = D3D11_USAGE_DEFAULT;
desc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
desc.CPUAccessFlags = 0;

ID3D11Texture2D *pTexture = NULL;
D3D11_SUBRESOURCE_DATA subResource;
subResource.pSysMem = image_data;
subResource.SysMemPitch = desc.Width * 4;
subResource.SysMemSlicePitch = 0;
g_pd3dDevice->CreateTexture2D(&desc, &subResource, &pTexture);

// Create texture view
D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
ZeroMemory(&srvDesc, sizeof(srvDesc));
srvDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
srvDesc.Texture2D.MipLevels = desc.MipLevels;
srvDesc.Texture2D.MostDetailedMip = 0;
g_pd3dDevice->CreateShaderResourceView(pTexture, &srvDesc, out_srv);
pTexture->Release();

*out_width = image_width;
*out_height = image_height;
stbi_image_free(image_data);

return true;

}

一切正常，除了 'g_pd3dDevice->CreateTexture2D(&desc, &subResource, &pTexture);' 线。因为你可以看到 g_pd3dDevice 是未定义的。这就是为什么我为此写一行： ID3D11Device* g_pd3dDevice = nullptr; 但是当我运行代码时它会挂起。我想我必须在使用这部分之前创建一个 3ddevice。但我不能。有什么建议么？谢谢

现在我可以得到一些图像，但这是错误的： 在此处输入图像描述

在此处输入图像描述

现在我的代码是这样的；

bool LoadTextureFromBufferDX11(unsigned char* address,    ID3D11ShaderResourceView** out_srv, int* out_width, int* out_height)

{

WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, WndProc, 0L, 0L,    GetModuleHandle(NULL), NULL, NULL, NULL, NULL, _T("ImGui Example"), NULL };
::RegisterClassEx(&wc);

//HWND hwnd = ::CreateWindow(wc.lpszClassName, _T("Dear ImGui DirectX11 Example"), WS_OVERLAPPEDWINDOW, 100, 100, 200, 200, NULL, NULL, wc.hInstance, NULL);

HWND hwnd = GetForegroundWindow();
CreateDeviceD3D(hwnd);
/*
if (!CreateDeviceD3D(hwnd))
{
    CleanupDeviceD3D();
    ::UnregisterClass(wc.lpszClassName, wc.hInstance);
    return 1;
}
*/
//ImGui_ImplDX11_Init(g_pd3dDevice, g_pd3dDeviceContext);


// Load from disk into a raw RGBA buffer
int image_width = 0;
int image_height = 0;




const char* filename = "e:\\obama.png";

unsigned char* image_data = stbi_load(filename, &image_width, &image_height, NULL, 4);
//unsigned char* image_data = address;
if (image_data == NULL)
    return false;



// Create texture
D3D11_TEXTURE2D_DESC desc;
ZeroMemory(&desc, sizeof(desc));
desc.Width = image_width;
desc.Height = image_height;
desc.MipLevels = 1;
desc.ArraySize = 1;
desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
desc.SampleDesc.Count = 1;
desc.Usage = D3D11_USAGE_DEFAULT;
desc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
desc.CPUAccessFlags = 0;

ID3D11Texture2D *pTexture = NULL;



D3D11_SUBRESOURCE_DATA subResource;
subResource.pSysMem = image_data;
subResource.SysMemPitch = desc.Width * 4;
subResource.SysMemSlicePitch = 0;



g_pd3dDevice->CreateTexture2D(&desc, &subResource, &pTexture);



// Create texture view
D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
ZeroMemory(&srvDesc, sizeof(srvDesc));
srvDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
srvDesc.Texture2D.MipLevels = desc.MipLevels;
srvDesc.Texture2D.MostDetailedMip = 0;
g_pd3dDevice->CreateShaderResourceView(pTexture, &srvDesc, out_srv);
pTexture->Release();

*out_width = image_width;
*out_height = image_height;


return true;

}

我从主机应用程序触发了这个功能。

 static ID3D11ShaderResourceView* my_texture = NULL;
int my_image_width = 0;
int my_image_height = 0;
fn_export double imgui_showimage(unsigned char* address) {



 bool ret = LoadTextureFromBufferDX11(address, &my_texture,  &my_image_width, &my_image_height);
//IM_ASSERT(ret);
//ImGui::Image((void*)my_texture, ImVec2(my_image_width, my_image_height));
return 1;
}

我从主机中绘制 imgu 图像，例如；

fn_export double imgui_image(char* address) {

ImGui::Image((void*)my_texture, ImVec2(my_image_width, my_image_height));
return 1;
}
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