Why do I need a 3D device to create a 2D device context in DirectX?
I am reading this page of the DirectX programming guide (https://learn.microsoft.com/en-us/windows/win32/direct2d/devices-and-device-contexts) and I wonder if anyone could help me understand the reason behind the following paragraph:
What is a Direct2D device? You need a Direct2D device and a Direct3D device to create a Direct2D device context. A Direct2D device (exposes an ID2D1Device interface pointer) represents a display adapter. A Direct3D device (exposes an ID3D11Device interface pointer) is associated with a Direct2D device. Each app must have one Direct2D device, but can have more than one device.
Why do I need a 3D device for creating a 2D device context instead of just creating a 2D device? What is happening behind the scenes and what is the role of the 3D device for rendering 2D graphics?
The basic answer here is that the Direct3D API talks to the video driver which natively supports Direct3D primitives (points, single-pixel lines, and triangles all with optional textures).
Direct2D is a software layer that implement 'vector graphics' primitives which are ultimately scan-converted into Direct3D primitives.
DirectWrite uses Direct2D to do it's output, which in turn uses Direct3D.
Direct2D uses Direct3D 10.1 specifically. With DirectX 11.1 (Windows 8 or later, Windows 7 with KB2670838 installed) the interop between Direct3D 10.1 and Direct3D 11 is handled by the system. Prior to that, the developer had to have a Direct3D 10.1, Direct3D 11, and Direct2D device.
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