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Can you render to a texture in system memory?

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I'm actually learning XNA, but I'm curious if ANY implementation of DirectX let's you create a texture/render-target in system memory and then render to it. Thanks for any help :)

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Thanks for the reply!

I'm actually creating a Worms type of game and I'm trying to create very large, resolution independant 2D terrain.

I'm using the stencil buffer to display my terrain, but I need to keep a resolution independant collision/stencil mask in system memory...

If I want to deform the terrain mask with a circle, I guess I'll just have to create a "circle array" and manually do everything...?

Anybody have any other ideas?

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