Patch smaller textures2d onto a larger texture2d with a shader

Hi everyone,

I want to generate different rendertextures on the fly by a shader. Means I want to patch some smaller sized textures into a larger rendertexture on different positions. The public rendertexture result should be used in some different materials.

(I do not want to use any cs script that build it pix by pix, or any camera quad solution)




My idea was to use a script that pass the required values to a shader and execute with graphic.blit.
But how to setup a shader for this because of the different texture sizes.
Any ideas how to set up a shader for this?

Thank you and kind regards,
Quatum

"I also thought about to clamp a texture and patch it by tile and uv offset, but that cause some ugly last line repeatings on the result texture."

 

Thanks, but as I wrote no cam quads plz! :-]
Under different conditions its required to blend normals and other stuff of single small textures into the main texture. So I ran into the same problems as before. The best would be a shader solution.

 

"immediate mode rendering"
Hmm.. Is this GL.(QUADS) and Graphics.Blit (source, dest, mat); stuff by script?