Re: Merging CSS Shaders proposal into Filter Effects

On Fri, Nov 4, 2011 at 12:27 AM, Robert O'Callahan <robert@ocallahan.org> wrote:
> One crazy idea I just had to implement event coordinate transformation:
> create a 256x256 texture, set each pixel's R value to the X coordinate and G
> value to the Y coordinate, apply the vertex shader with an identity fragment
> shader, and save the result. To transform an event coordinate, extract from
> the result the color value at the pixel you care about, and recover the
> original X and Y values from the R and G channels.

That's not so crazy.  I think Greg Tavares had the same idea.

~TJ