ImGUI::Image Problems with DirectX11

[Throbbing]

The ImGui::Image function can correctly show SRV created from file(D3DX11GetImageInfoFromFileA ) .

However .when I create a manual SRV. the **ImGui::Image ** show nothing.

`
D3D11_TEXTURE2D_DESC td;
	ZeroMemory(&td, sizeof(td));
	td.Usage = D3D11_USAGE_DEFAULT;
	td.BindFlags = D3D11_BIND_SHADER_RESOURCE;
	td.Width = 600;
	td.Height = 400;
	td.Format = DXGI_FORMAT_R32G32B32A32_FLOAT;
	td.MipLevels = 1;
	td.ArraySize = 1;
	td.MiscFlags = 0;
	td.CPUAccessFlags = 0;
	td.SampleDesc.Count = 1;
	td.SampleDesc.Quality = 0;

D3D11_SUBRESOURCE_DATA sd;
sd.pSysMem = dd;
sd.SysMemPitch = 600*sizeOF(DXGI_FORMAT_R32G32B32A32_FLOAT);
HR(jmxREX::hw.d3dDevice->CreateTexture2D(&td, &sd, &mGameWndImage.tex));


D3D11_SHADER_RESOURCE_VIEW_DESC srvd;
ZeroMemory(&srvd, sizeof(srvd));
srvd.Format = td.Format;
srvd.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
srvd.Texture2D.MostDetailedMip = 0;
srvd.Texture2D.MipLevels = 1;
HR(jmxREX::hw.d3dDevice->CreateShaderResourceView(mGameWndImage.tex, &srvd, &mGameWndImage.srv));`

But by the NSight, I found that the SRV is created successfully and filled expected color.

What is Wrong?

[ocornut]

This is mostly a DX11 question, not an ImGui question.

The only thing ImGui::Image() does it store your ImTextureId parameter and then emit vertices.
The rendering details are left to the rendering loop and are DirectX11 details.

If you can suggest a way to improve the DX11 example code to naturally cover most use cases, a patch is welcome. If you have build your own engine over DX11 you should probably change your use of ImTextureId to pass in higher level primitives that just a ID3D11ShaderResourceView* as imgui_impl_dx11.cpp does. I don't know enough about DX11 to imagine all possible use cases.

[Throbbing]

@ocornut
Oh. It is my problem...
When i fill the SRV, I neglect the BlendState and set the alpha channel of texture '0',It means that the whole SRV is transparent for DX11 .
I have solved it.Thank you for you reply

[ocornut]

I have now written a tutorial to cover image file loading for common graphics API:
https://github.com/ocornut/imgui/wiki/Image-Loading-and-Displaying-Examples