Multiple Render Targets (MRT)
参考：
Multiple Render Targets – Wikipedia
Multiple Render Targets support · Issue #64 · kakashidinho/metalangle – GitHub
Multiple Render Targets – Unity Discussions
OpenGL can only render to 8 render target in a single draw call? – reddit
How many render targets is too many? – MonoGame Community
RenderTarget2D limitations? – MonoGame Community
Frame Buffer Object (FBO)
ドキュメント：
Framebuffer Object | OpenGL Wiki
参考：
Can’t create FBO with more than 8 render buffers – Stack Overflow
Multiple Render Targets in one FBO with different size textures? – Stack Overflow
Z ファイティング
参考：