Supported Platforms for Render to Texture

I’m evaluating Unity to implement a game I’ve prototyped directly in Cocoa/OpenGL. Because of the nature of the game’s data, I really need the render to texture functionality provided by Unity Pro (but I can live without pixel shaders as required).

My question is: are there any platforms which do not support render to texture? I presume that on Mac, the function relies on GL_APPLE_pixel_buffer, which was introduced in 10.3. This is good, because I only care about 10.3.9 and 10.4.x on Mac (and XP SP1 and later on Windows).

So, are there any known exceptions to the availability of this feature?

We support render texture even on 10.2 using the previous render texture api as a fallback. On windows every opengl driver has render texture support too.

Awesome. Thanks.

Some really old graphics cards and drivers on Windows have RenderTexture disabled due to driver bugs (some old S3, SIS cards fall into this category).