| /* |
| * 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. |
| */ |
| |
| //TODO: We currently ignore the input kernel lengths |
| kernel vec4 convolve3x3(sampler image, float divisor, float bias, |
| vec3 m0, vec3 m1, vec3 m2) |
| { |
| vec4 colour = vec4(0.0, 0.0, 0.0, 0.0); |
| vec2 pos= samplerCoord(image); |
| colour = sample(image, pos + vec2(-1.0, -1.0)) *m0.x; |
| colour += sample(image, pos + vec2(-1.0, 0.0)) *m0.y; |
| colour += sample(image, pos + vec2(-1.0, 1.0)) *m0.z; |
| colour += sample(image, pos + vec2( 0.0, -1.0)) *m1.x; |
| colour += sample(image, pos) * m1.y; |
| colour += sample(image, pos + vec2( 0.0, 1.0))*m1.z; |
| colour += sample(image, pos + vec2( 1.0, -1.0))*m2.x; |
| colour += sample(image, pos + vec2( 1.0, 0.0))*m2.y; |
| colour += sample(image, pos + vec2( 1.0, 1.0))*m2.z; |
| return colour / divisor + bias; |
| } |
| |
| kernel vec4 mergeNormals(sampler Nx, sampler Ny, sampler src, float surfaceScale) |
| { |
| vec3 N = vec3(surfaceScale * sample(Nx, samplerCoord(Nx)).a, -surfaceScale * sample(Ny, samplerCoord(Ny)).a, 1.0); |
| N = normalize(N); |
| return vec4(N.x, N.y, N.z, sample(src, samplerCoord(src)).a); |
| } |