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RobMaddison

Rendering to a region of a texture

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Is it possible to do this in direct X 9? I'm rendering to a very large texture but I only want to update a relatively small region of it. Seems wasteful to render the whole thing?

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Yes, that's what the Viewport state does.

 

Thanks, I did some googling but couldn't find anything obvious - I was wrongly looking for locking

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Just for completeness here some alternatives:
 
- Scissors (SetScissorRect)
- If you can define the shape easily with primitives, just render that (e.g. a quad to a certain part of your RT)
- Custom clip planes (SetClipPlane)
- clip/discard in the pixel shader (for more complex shapes)
- use the stencil buffer as a mask

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