Re: Emulate D3D9's StretchRect

You want this:

http://www.opengl.org/registry/specs/EXT/framebuffer_blit.txt

Ray Ratelis wrote:

I'm porting some code from D3D9 to OpenGL and the D3D9
version uses StretchRect to copy the frame buffer (which is usually non
pow2) into a pow2 texture. How would I do this in OpenGL?

One way I was thinking of was to CopyTexImage2D into a non-pow2 texture
rectangle and then use a pow2 offscreen-context (the same size as my
destination pow2 texture) to render the texture rectangle into using a
simple quad. Then I would CopyTexImage2D into my destination pow2
texture. That sounds horribly inefficient. Is there a better way?

This will happen a few times per frame, so I don't want to copy the
background buffer to system memory and do a scale there.

Any ideas are helpful.

- Ray

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