| /* |
| * Copyright (C) 2005 Oliver Hunt <ojh16@student.canterbury.ac.nz>. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. |
| */ |
| |
| kernel vec4 diffuseLighting(sampler normalVectors, sampler lightVectors, __color lightingColor, |
| float surfaceScale, float diffuseConstant, float kernelLengthX, float kernelLengthY) |
| { |
| vec2 pos = samplerCoord(lightVectors); |
| vec2 posn = samplerCoord(normalVectors); |
| vec4 l4 = sample(lightVectors, pos); |
| vec3 l = l4.xyz; |
| l = normalize(l); |
| vec3 n = sample(normalVectors, posn).xyz; |
| float nl = dot(l, n) * diffuseConstant; |
| vec4 res = vec4(lightingColor.r * nl, lightingColor.g * nl, lightingColor.b * nl, 1.0); |
| res.xyz *= l4.w; |
| return res; |
| } |
