koobas.hobune.stream
Fastest way to combine two textures.
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.
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.
