多目标渲染，不支持antialiasing


Multiple Render Targets (Direct3D 9  SDK)
Multiple Render Targets (MRT) refers to the ability to render to multiple surfaces (see IDirect3D9Surface) with a single draw call. These surfaces can be created independently of each other. Render targets can be set using IDirect3DDevice9::SetRenderTarget.

Multiple render targets have the following restrictions:

No antialiasing is supported.

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原文地址：https://www.cnblogs.com/waterdragon/p/2549903.html