I've been trying find a way to access pixels in a texture in order to get/set the color of a pixel.

I've been fumbling around quite a lot. Hopefully someone can present an idea to accomplish this. My implementation works but is really slow.

What I've done is extend Texture2D as a MutableTexture2D that allow you to access a pixel in a really slow manner.

Since texture data resides in the GPU I had to store the array of pixel values.

I've gone through these attempts at creating this class.
1st:
Using glTexImage2D to create a new texture from the data array. Which means I'm releasing the old texture, then binding a new texture. It works though really slowly.

2nd:
glTexSubImage2D allows portions of a texture image replacement so this should be faster but implementing this made MutableTexture2D slower than before... =/

3rd:
Read about PBO 'Pixel Buffer Objects' and the idea seems to fit my needs but, I think, it's not implemented in opengles1.1.

Right now I'm at a loss of ideas. If anyone can suggest anything then that would be awesome.