Merge "Don't attempt to tone map content that is already in range." into...

                                float nits = xyz.y;

                                // clamp to max input luminance

                                nits = clamp(nits, 0.0, maxInLumi);

                                // scale [0.0, maxInLumi] to [0.0, maxOutLumi]

                                // if the max input luminance is less than what we can output then

                                // no tone mapping is needed as all color values will be in range.

                                if (maxInLumi <= maxOutLumi) {

                                    return xyz * (maxOutLumi / maxInLumi);

                                    return xyz;

                                } else {

                                    // three control points

                                    const float x0 = 10.0;

                                    const float y0 = 17.0;