Fastest way to combine two textures.

Question

coming from an XNA and Flash background I'm used to having surfaces to copy images too.

What I want to ask is what's the fastest way to combine one texture with another? The equivalent of copying a rectangular area of pixels of one texture with a drawing surface?

I.e.

public void CombineTextures(Rect srcArea,Texture2D src,int destX,int destY,Texture2D dest);

I don't like using planes for 2D stuff, as camera zooming tends to lead to artifacts such as wobbly edges.

I've already looked up and tried using: texture2d.GetPixels/texture2d.SetPixels/Apply() The problem was that Apply() runs too slowly. Even if it's called once each frame on a 1024*1024 texture (power of 2 uncompressed).

I remember hearing shaders mentioned occasionally as a possible solution. If so how would I write a shader to do just that?

Please help this issue, has really been driving me mad the past two days.

Answer 1

Answer by tomekkie2 · Jan 06, 2013 at 08:14 AM

The Decal shader does that. You can modify the shader's code to change the way how it combines or add more textures into that.

I was also using CombineTextures in some projects, but only once at start or just after loading the new texture at runtime and that worked well.

I think it is better to get done by shader if you need that each frame.

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glider521al · Jan 06, 2013 at 10:30 AM 0

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Thanks I'll give it a look when I get back to it.

Fastest way to combine two textures.

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