removed a left over OpenCL fragment

core/cl/tools/raycasting.cl

-// ================================================================================================
-// 
-// This file is part of the CAMPVis Visualization Framework.
-// 
-// If not explicitly stated otherwise: Copyright (C) 2012, all rights reserved,
-//      Christian Schulte zu Berge (christian.szb@in.tum.de)
-//      Chair for Computer Aided Medical Procedures
-//      Technische Universität München
-//      Boltzmannstr. 3, 85748 Garching b. München, Germany
-// 
-// The licensing of this softare is not yet resolved. Until then, redistribution in source or
-// binary forms outside the CAMP chair is not permitted, unless explicitly stated in legal form.
-// However, the names of the original authors and the above copyright notice must retain in its
-// original state in any case.
-// 
-// Legal disclaimer provided by the BSD license:
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
-// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
-// AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
-// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
-// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
-// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
-// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-// POSSIBILITY OF SUCH DAMAGE.
-// 
-// ================================================================================================
-
-/**
- * Code adapted from: https://www.marcusbannerman.co.uk/index.php/component/content/article/42-articles/97-vol-render-optimizations.htm
- */
-float4 jitterEntryPoint(float4 position, float4 direction, float stepSize) {
-    float random;
-    fract(sin((float)get_global_id(0) * 12.9898 + (float)get_global_id(1) * 78.233) * 43758.5453, &random);
-    return position + direction * (stepSize * random);
-}